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19-0535; Rev 2; 2/09
Video Filter Amplifier with SmartSleep and Y/C Mixer Circuit
General Description
The MAX9512 video filter amplifier with SmartSleep and Y/C mixer is ideal for portable media players (PMPs), portable DVD players, and set-top boxes (STBs). The inputs can be directly connected to the digital-to-analog converter (DAC) outputs. The dual reconstruction filters remove high-frequency signals above 6.75MHz. The Y/C-to-CVBS mixer creates a composite video signal from luma and chroma. The four amplifiers each have 6dB of gain. The outputs can be DC-coupled to a load of 75, which is equivalent to two video loads, or AC-coupled to a load of 150. The SmartSleep circuitry intelligently reduces power consumption based on the presence of the input signal and the output loads. When the MAX9512 does not detect the presence of sync on luma, the supply current is reduced to less than 7A. The device only enables a video amplifier when there is an active video input signal and an attached load. The video amplifier remains on while a load is connected. If the load is disconnected, the video amplifier is turned off. The MAX9512 operates from a 2.7V to 3.6V single supply and is offered in a small, 16-pin TQFN (3mm x 3mm) package. The device is specified over the -40C to +125C automotive temperature range.
Features
SmartSleep Feature Detects Input Signal and Output Load Status to Reduce Power Consumption Dual Standard-Definition Video Reconstruction Filters with 6.75MHz Passband Luma and Chroma Inputs Y/C-to-CVBS Mixer Luma, Chroma, and Two Composite Outputs Supports Two Video Loads at Each Output (DC-Coupled) 2.7V to 3.6V Single-Supply Operation
MAX9512
Ordering Information
PART MAX9512ATE+ PIN-PACKAGE 16 TQFN-EP* (3mm x 3mm) TOP MARK AEN
Applications
Portable Media Players (PMPs) Portable DVD Players Set-Top Boxes (STBs) Portable Applications
Note: All devices specified over the -40C to +125C operating temperature range. +Denotes lead(Pb)-free/RoHS-compliant package. *EP = Exposed pad.
Block Diagrams
LOAD SENSE BUFFER CIN LPF 6dB COUT
Pin Configuration
CVBSOUT1 COUT
TOP VIEW
YOUT
CVBSOUT2
LOAD SENSE BUFFER YIN LPF 6dB YOUT
12 VDD 13 N.C. 14 SMARTSLEEP 15 CIN 16
11
10
9 8 7 GND N.C. SHDN N.C.
MAX9512 +
1 VDD 2 YIN 3 GND 4 N.C.
6 5
SMARTSLEEP SHDN
ACTIVE VIDEO DETECT CONTROL LOGIC 6dB
LOAD SENSE CVBSOUT1
LOAD SENSE 6dB CVBSOUT2
MAX9512
THIN QFN (3mm x 3mm)
Block Diagrams continued at end of data sheet.
1
________________________________________________________________ Maxim Integrated Products
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxim's website at www.maxim-ic.com.
Video Filter Amplifier with SmartSleep and Y/C Mixer Circuit MAX9512
ABSOLUTE MAXIMUM RATINGS
(All voltages referenced to GND) VDD ...........................................................................-0.3V to +4V CIN, YIN, SMARTSLEEP, SHDN...............................-0.3V to +4V Duration of COUT, YOUT, CVBSOUT1, CVBSOUT2 Short Circuit to VDD or GND....................................Continuous Continuous Input Current CIN, YIN, SMARTSLEEP, SHDN ....................................20mA Continuous Power Dissipation (TA = +70C) 16-Pin TQFN-EP (derate 15.6mW/C above +70C)...1250mW Operating Temperature Range .........................-40C to +125C Junction Temperature ......................................................+150C Storage Temperature Range .............................-65C to +150C Lead Temperature (soldering, 10s) .................................+300C
Stresses beyond those listed under "Absolute Maximum Ratings" may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.
ELECTRICAL CHARACTERISTICS
(VDD = VSHDN = 3.3V, VSMARTSLEEP = GND = 0V. RL = No load. TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25C.) (Note 1)
PARAMETER Supply Voltage Range SYMBOL VDD CONDITIONS Guaranteed by PSRR YIN = 0.3V, CIN = 0.6V SMARTSLEEP = VDD, YIN has no active video signal SMARTSLEEP = VDD, YIN has a black-burst video signal with sync tip at GND (Note 2) Shutdown Supply Current SMARTSLEEP CHARACTERISTICS Minimum Line Frequency Sync Slice Level Output Load Detect Threshold DC CHARACTERISTICS CIN, YIN, guaranteed by output voltage swing CIN = YIN = 0V CIN, YIN TA = -40C to 0V VIN +85C 1.05V, VDD TA = -40C to = 2.7V +125C 0V VIN 1.2V, VDD = 3.0V TA = -40C to +85C TA = -40C to +125C 5.7 5.6 5.7 5.6 6 2.7V < VDD < 3.6V 3.0V < VDD < 3.6V 0 0 2 20 6 6.3 6.3 dB 6.3 6.3 1.05 V 1.2 5 A M YIN YIN RL to GND, sync pulse present 14.3 4.1 5.2 200 kHz % VDD ISHDN VSHDN = GND MIN 2.7 13 7 TYP MAX 3.6 16 14 A 17 0.01 10 A UNITS V mA
Supply Current
IDD
Input-Voltage Range
VIN
Input Current Input Resistance
IIN RIN
DC Voltage Gain
AV
RL = 150 to VDD / 2
2
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Video Filter Amplifier with SmartSleep and Y/C Mixer Circuit
ELECTRICAL CHARACTERISTICS (continued)
(VDD = VSHDN = 3.3V, VSMARTSLEEP = GND = 0V. RL = No load. TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25C.) (Note 1)
PARAMETER SYMBOL CONDITIONS 0V VIN 1.05V, VDD = 2.7V DC Gain Matching 0V VIN 1.2V, VDD = 3.0V Output Level CIN = YIN = 0V, RL = 150 to GND Measured at output, VDD = 2.7V, 0V VIN 1.05V, RL = 150 to -0.2V TA = -40C to +85C TA = -40C to +125C -0.2 0.188 2.027 2.006 0 0.3 2.1 +0.2 0.400 2.163 2.163 V MIN -0.2 TYP 0 MAX +0.2 dB UNITS
MAX9512
Measured at output, VDD = 2.7V, 0V VIN 1.05V, RL = 150 to VDD / 2 Output Voltage Swing Measured at output, VDD = 3V, 0V VIN 1.2V, RL = 150 to -0.2V TA = -40C to +85C TA = -40C to +125C
2.027
2.1
2.163
2.316 2.292 2.316
2.4
2.472 2.472
VP-P
Measured at output, VDD = 3V, 0V VIN 1.2V, RL = 150 to VDD / 2 Measured at output, VDD = 3.135V, 0V VIN 1.05V, RL = 75 to -0.2V Output Resistance Power-Supply Rejection Ratio Output Shutdown Impedance LOGIC INPUTS (SMARTSLEEP, SHDN) Logic-Low Threshold Logic-High Threshold Logic Input Current VIL VIH IIL/IIH VI = 0V or VDD ROUT PSRR VOUT = 1.3V, -5mA ILOAD +5mA 2.7V VDD 3.6V, input referred, RL = 150 to GND
2.4
2.472
2.027
2.1 0.47
2.163 dB
48 28 0.3 x VDD 0.7 x VDD 0.01 10
k V V A
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Video Filter Amplifier with SmartSleep and Y/C Mixer Circuit MAX9512
AC CHARACTERISTICS
(VDD = VSHDN = +3.3V, VSMARTSLEEP = GND = 0V, RL = 150 to GND. TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25C.) (Note 1)
PARAMETER Color Subcarrier Output Voltage Swing Mixer HPF -3dB Frequency f = 5.5MHz Standard-Definition Reconstruction Filter Inputs are 1VP-P, Reference frequency is 1MHz f = 6.75MHz f = 11MHz f = 27MHz DC-coupled output, 5-step modulated staircase Differential Gain DG AC-coupled output, 5-step modulated staircase DC-coupled output, 5-step modulated staircase Differential Phase DP AC-coupled output, 5-step modulated staircase 2T Pulse Response 2T = 200ns or 250ns f = 3.58MHz f = 4.43MHz 0.78 1.01 0.2 K% f = 3.58MHz or 4.43MHz f = 3.58MHz f = 4.43MHz 0.4 0.62 0.75 degrees f = 3.58MHz or 4.43MHz -33 -1 SYMBOL CONDITIONS VDD = 2.7V, YIN = 0.65V, CIN = 0.7VP-P VDD = 3.0V, YIN = 0.75V, CIN = 0.9VP-P MIN TYP 1.4 VP-P 1.8 300 -0.1 -0.3 -3 -41 0.2 % +1 dB kHz MAX UNITS
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Video Filter Amplifier with SmartSleep and Y/C Mixer Circuit
AC CHARACTERISTICS (continued)
(VDD = VSHDN = +3.3V, VSMARTSLEEP = GND = 0V, RL = 150 to GND. TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25C.) (Note 1)
PARAMETER 2T Bar Response SYMBOL CONDITIONS Bar time is 18s, the beginning 2.5% and the ending 2.5% of the bar time are ignored, 2T = 200ns or 250ns Bar time is 18s, the beginning 2.5% and the ending 2.5% of the bar time are ignored, 2T = 200ns or 250ns 5-step staircase Difference in time between the 50% point of the output signals, YOUT to COUT 100kHz f 5MHz, inputs are 1VP-P Outputs are 2VP-P 100kHz f 5MHz, inputs are 1VP-P f = 100kHz, 200mVP-P, input referred f = 5MHz YIN = 1V, output settled to within 1% of the final voltage, RL = 150 to GND YIN = 1V, output settled to within 1% of the final voltage, RL = 150 to GND MIN TYP 0.2 MAX UNITS K%
MAX9512
2T Pulse-to-Bar K Rating Nonlinearity Interchannel Timing Error Group Delay Distortion Interchannel Group Delay Distortion Error Peak Signal to RMS Noise Power-Supply Rejection Ratio Output Impedance Enable Time
0.3 0.1 0.2 10 2 67 43 6 13
K% % ns ns ns dB dB s
Disable Time CROSSTALK All Hostile Output Crosstalk All Hostile Input Crosstalk
1.1
s
f = 4.43MHz f = 4.43MHz, SHDN = GND, input termination resistors are 75
-71 -106
dB dB
Note 1: All devices are 100% production tested at TA = +25C. Specifications over temperature limits are guaranteed by design. Note 2: Specified current is an average over time.
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Video Filter Amplifier with SmartSleep and Y/C Mixer Circuit MAX9512
Typical Operating Characteristics
(VDD = V SHDN = +3.3V, VSMARTSLEEP = GND = 0V. Video outputs have RL = 150 connected to GND. TA = +25C, unless otherwise noted.)
SMALL-SIGNAL GAIN vs. FREQUENCY
MAX9512 toc01
SMALL-SIGNAL GAIN FLATNESS vs. FREQUENCY
MAX9512 toc02
LARGE-SIGNAL GAIN vs. FREQUENCY
10 OUTPUT AMPLITUDE (dB) 0 -10 -20 -30 -40 -50 -60 VOUT = 2VP-P NORMALIZED TO 1MHz
MAX9512 toc03
20 10 OUTPUT AMPLITUDE (dB) 0 -10 -20 -30 -40 -50 -60 100k 1M 10M VOUT = 100mVP-P NORMALIZED TO 1MHz
1.0 0.8 OUTPUT AMPLITUDE (dB) 0.6 0.4 0.2 0 -0.2 -0.4 -0.6 -0.8 -1.0 VOUT = 100mVP-P NORMALIZED TO 1MHz
20
100M
100k
1M
10M
100M
100k
1M
10M
100M
FREQUENCY (Hz)
FREQUENCY (Hz)
FREQUENCY (Hz)
LARGE-SIGNAL GAIN FLATNESS vs. FREQUENCY
MAX9512 toc04
GROUP DELAY
MAX9512 toc05
POWER-SUPPLY REJECTION RATIO vs. FREQUENCY
-10 -20 PSRR (dB) -30 -40 -50
MAX9512 toc06
1.0 0.8 OUTPUT AMPLITUDE (dB) 0.6 0.4 0.2 0 -0.2 -0.4 -0.6 -0.8 -1.0 100k 1M 10M VOUT = 2VP-P NORMALIZED TO 1MHz
150 VOUT = 2VP-P 125 100 DELAY (ns) 75 50 25 0 -25
0
-60 -70 -80 100k 1M 10M 100M 10k 100k 1M FREQUENCY (Hz) 10M 100M FREQUENCY (Hz)
100M
FREQUENCY (Hz)
QUIESCENT SUPPLY CURRENT vs. TEMPERATURE
MAX9512 toc07
VOLTAGE GAIN vs. TEMPERATURE
MAX9512 toc08
14.0 13.5 SUPPLY CURRENT (mA) 13.0 12.5 12.0 11.5 11.0 -50 -25 0 25 50 75 100
2.02 2.01 VOLTAGE GAIN (V/V) 2.00 1.99 1.98 1.97 1.96 1.95
125
-50
-25
0
25
50
75
100
125
TEMPERATURE (C)
TEMPERATURE (C)
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Video Filter Amplifier with SmartSleep and Y/C Mixer Circuit
Typical Operating Characteristics (continued)
(VDD = V SHDN = +3.3V, VSMARTSLEEP = GND = 0V. Video outputs have RL = 150 connected to GND. TA = +25C, unless otherwise noted.)
OUTPUT VOLTAGE vs. INPUT VOLTAGE
MAX9512 toc09
MAX9512
DIFFERENTIAL GAIN AND PHASE
0.3 0.2 0.1 0 -0.1 -0.2 -0.3 0.8 0.4 0 DIFFERENTIAL GAIN (%)
MAX9512 toc10
2T RESPONSE
MAX9512 toc11
4.0 3.5 3.0 OUTPUT VOLTAGE (V) 2.5 2.0 1.5 1.0 0.5 0 -0.5
YIN, CIN INPUTS ONLY
VIN 200mV/div 1 2 3 4 5 6 7
DIFFERENTIAL PHASE (DEG)
VOUT 400mV/div
-0.4 -0.8 1 2 3 4 STEP 5 6 7 100ns/div
-0.5
0
0.5
1.0
1.5
2.0
INPUT VOLTAGE (V)
12.5T RESPONSE
MAX9512 toc12
NTC-7 VIDEO TEST SIGNAL GENERATED FROM LUMA AND CHROMA INPUTS
MAX9512 toc13
PAL MULTIBURST RESPONSE
MAX9512 toc14
YIN 500mV/div YIN 200mV/div CIN 500mV/div YOUT 400mV/div CVBOUT1 1V/div CVBSOUT1 1V/div
CVBSIN 500mV/div
400ns/div
10s/div
10s/div
PAL COLOR BARS
MAX9512 toc15
FIELD SQUARE-WAVE RESPONSE
MAX9512 toc16
CVBSIN 500mV/div
CVBSIN 500mV/div
CVBSOUT1 1V/div
CVBSOUT1 1V/div
10s/div
2ms/div
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Video Filter Amplifier with SmartSleep and Y/C Mixer Circuit MAX9512
Typical Operating Characteristics (continued)
(VDD = V SHDN = +3.3V, VSMARTSLEEP = GND = 0V. Video outputs have RL = 150 connected to GND. TA = +25C, unless otherwise noted.)
FREQUENCY RESPONSE AT 6.75MHz DISTRIBUTION
MAX9512 toc18 MAX9512 toc19
ENABLE TIME
MAX9512 toc17
DISABLE TIME
INPUT VOLTAGE = 1V OUTPUT 1V/div OUTPUT 1V/div PROBABILITY SHDN 1V/div SHDN 1V/div -0.6
INPUT VOLTAGE = 1V
2s/div
200ns/div
-0.5
-0.4
-0.3
-0.2
-0.1
0
ATTENUATION (dB)
FREQUENCY RESPONSE AT 27MHz DISTRIBUTION
MAX9512 toc20
INPUT-TO-INPUT CROSSTALK vs. FREQUENCY
MAX9512 toc21
0 -20 CROSSTALK (dB) -40 -60 -80 -100 -120
PROBABILITY -52 -50 -48 -46 -44 -42 -40 -38 -36 -34 -32 ATTENUATION (dB)
100k
1M
10M
100M
FREQUENCY (Hz)
OUTPUT-TO-OUTPUT CROSSTALK vs. FREQUENCY
MAX9512 toc22
OUTPUT IMPEDANCE vs. FREQUENCY
MAX9512 toc23
0 -20 CROSSTALK (dB) -40 -60 -80 -100 -120 100k 1M 10M
100
OUTPUT IMPEDANCE () 100M
10
1
0.1 100k 1M 10M 100M FREQUENCY (Hz) FREQUENCY (Hz)
8
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Video Filter Amplifier with SmartSleep and Y/C Mixer Circuit
Pin Description
PIN TQFN-EP 1, 13 2 3, 8 4, 5, 7, 14 6 9 10 11 12 15 16 -- NAME VDD YIN GND N.C. SHDN CVBSOUT2 CVBSOUT1 YOUT COUT SMARTSLEEP CIN EP FUNCTION Power Supply. Bypass with a 0.1F capacitor to GND. Luma Video Input. Directly connect this input to the video DAC output. Ground No Connection. Connect to GND. Active-Low Shutdown Logic Input. Connect to logic low to place device in shutdown. Connect to logic high for normal operation. CVBS Output 2 CVBS Output 1 Luma Video Output Chroma Video Output SmartSleep Logic Input. Connect to logic high to activate SmartSleep operation. Chroma Video Input. Directly connect this input to the video DAC output. Exposed Pad. Connect EP to GND. EP is also internally connected to GND.
MAX9512
+3.3V
0.1F VDD VIDEO ENCODER BUFFER CURRENT DAC CIN LPF 6dB LOAD SENSE COUT 75 CHROMA
BUFFER CURRENT DAC YIN LPF 6dB
LOAD SENSE YOUT 75 LUMA
MAX9512
ACTIVE VIDEO DETECT SMARTSLEEP +3.3V SHDN CONTROL LOGIC 6dB 6dB
LOAD SENSE CVBSOUT1 75 CVBS1
LOAD SENSE CVBSOUT2 75 CVBS2
GND
Figure 1. Typical Application Circuit for Portable Media Players
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Video Filter Amplifier with SmartSleep and Y/C Mixer Circuit MAX9512
Detailed Description
In the Typical Application Circuit (Figure 1), the current DACs on a video encoder generate luma and chroma video signals. The MAX9512 filters those signals and then adds them together to create the composite video signal. The output amplifiers drive the video connectors through a 75 back termination resistor. loads attached to the outputs. If the SmartSleep feature is not activated and the part is not in shutdown, the filters and output amplifiers completely turn on, regardless of whether there is a video signal at the YIN input and whether there are loads connected at the outputs. SmartSleep only works with DC-coupled loads.
SmartSleep Feature
The SmartSleep feature is activated when the SMARTSLEEP input is connected to logic high. The SmartSleep feature provides intelligent power management by selectively disabling the filters and output amplifiers based on the presence of a luma video signal or
Standby Mode In standby mode, the filters and output amplifiers are off and only the active video detect circuit is operational. Quiescent current consumption is approximately 7A (Figure 2). The active video detect circuit checks if sync is present on the YIN signal. If no sync is detected the device remains in standby mode.
+3.3V
7A NO VIDEO SIGNAL VIDEO ENCODER BUFFER CURRENT DAC CIN LPF OFF OFF OFF BUFFER CURRENT DAC YIN LPF OFF OFF 6dB OFF LOAD SENSE OFF YOUT 75 LUMA 6dB OFF LOAD SENSE OFF COUT 75 CHROMA VDD
LOAD SENSE OFF 6dB ACTIVE VIDEO DETECT SMARTSLEEP +3.3V SHDN CONTROL LOGIC 6dB OFF LOAD SENSE OFF CVBSOUT2 75 CVBS2 OFF CVBSOUT1 75 CVBS1
MAX9512
GND
Figure 2. Standby Mode Operation
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Video Filter Amplifier with SmartSleep and Y/C Mixer Circuit
Active-Detect Mode The active video detect circuit slices the YIN signal at 4.7% of the power supply (155mV for a 3.3V supply). If the transitions occur at a rate of 14.3kHz or higher, then a video signal is present. When the MAX9512 detects a video signal with sync at the YIN input, the control logic enters the active-detect mode and enables the load sense circuitry (Figure 3). The supply current is typically 17A. If an output load is not connected to any amplifier, the MAX9512 remains in active-detect mode. Eight times per second, each load-sense circuit checks for a load by connecting an internal 15k pullup resistor to the output for 1ms. If the output is pulled up, then no load is present. If the output stays low, a load is connected. Full-Operation Mode If a load is connected to an output, the corresponding filter and amplifier turn on and remain on until the output load is disconnected. In full-operation mode, SmartSleep intelligently reduces the supply current
based on the input signal presence and output loading. Figures 4 and 5 show which portions of the MAX9512 turn on and which remain off with different load configurations. In Figure 4, both filters and the Y/C mixer turn on to generate the composite video signal for the amplifier connected to CVBSOUT1. In Figure 5, only the luma filter turns on, and the Y/C mixer stays off. When an amplifier is on, it continually checks if the load has been disconnected by detecting if the amplifier output is sourcing current during a horizontal line time. If no sourcing current is detected within one horizontal line time (approximately 64s), the load has been disconnected and the amplifier returns to active-detect mode. If, at any time, the input video signal is removed, the MAX9512 returns to standby mode. If the SmartSleep feature is not activated and the part is not in shutdown, then the filters and amplifiers completely turn on, regardless of whether there is a video signal at the CVBSIN input and whether there are loads connected at the outputs.
MAX9512
0 TO 50mV 17A VIDEO SIGNAL PRESENT BUFFER CURRENT DAC CIN LPF OFF OFF
+3.3V
VDD LOAD SENSE 6dB OFF OFF 6dB OFF LOAD SENSE ACTIVE VIDEO DETECT 6dB OFF CONTROL LOGIC 6dB LOAD SENSE CVBSOUT2 75 CVBS2 CVBSOUT1 75 CVBS1 LOAD SENSE YOUT 75 LUMA NO LOADS COUT 75 CHROMA
VIDEO ENCODER
BUFFER CURRENT DAC YIN LPF OFF OFF
SMARTSLEEP +3.3V SHDN
MAX9512
GND
OFF
Figure 3. Active-Detect Mode with No Output Loads
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Video Filter Amplifier with SmartSleep and Y/C Mixer Circuit MAX9512
0 TO 50mV
+3.3V 5mA QUIESCENT SUPPLY CURRENT PLUS OUTPUT LOAD CURRENT VIDEO SIGNAL PRESENT VDD LOAD SENSE LPF 6dB OFF LOAD SENSE LPF 6dB OFF YOUT 75 LUMA COUT 75 CHROMA
VIDEO ENCODER BUFFER CURRENT DAC CIN
BUFFER CURRENT DAC YIN
ACTIVE VIDEO DETECT SMARTSLEEP +3.3V SHDN CONTROL LOGIC
LOAD SENSE 6dB CVBSOUT1 75 CVBS1
75
LOAD SENSE 6dB CVBSOUT2 75 CVBS 2
MAX9512
OFF GND
Figure 4. Full Operation Mode with CVBSOUT1 Loaded
12
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Video Filter Amplifier with SmartSleep and Y/C Mixer Circuit MAX9512
0 TO 50mV
+3.3V 2.9mA QUIESCENT SUPPLY CURRENT PLUS OUTPUT LOAD CURRENT VIDEO SIGNAL PRESENT VDD LOAD SENSE LPF OFF OFF OFF BUFFER 6dB OFF LOAD SENSE 6dB YOUT 75 LUMA COUT 75 CHROMA
VIDEO ENCODER BUFFER CURRENT DAC CIN
CURRENT DAC
YIN LPF
75
ACTIVE VIDEO DETECT SMARTSLEEP +3.3V SHDN CONTROL LOGIC
LOAD SENSE 6dB OFF CVBSOUT1 75 CVBS1
LOAD SENSE 6dB CVBSOUT2 75 CVBS2
MAX9512
OFF GND
Figure 5. Full Operation Mode with YOUT Loaded
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13
Video Filter Amplifier with SmartSleep and Y/C Mixer Circuit MAX9512
Inputs
The MAX9512 video inputs YIN and CIN should be directly connected to the output of the video current DAC. DC-coupling ensures that the input signals are ground referenced such that the sync tip of the luma signal is within 50mV of ground and the blank level of the chroma signal is between 0.5V and 0.65V. blank level of the chroma output is positioned at approximately 1.3V if the blank level of the chroma input signal is 0.5V. The blank level of the chroma output is positioned at approximately 1.5V if the blank level of the chroma input signal is 0.6V. If the supply voltage is greater than 3.135V (5% below a 3.3V supply), each amplifier can drive two DC-coupled video loads to ground. If the supply is less than 3.135V, each amplifier can drive only one DC-coupled or AC-coupled video load.
Video Reconstruction Filter
The MAX9512 filter passband is 6.75MHz, which makes the device suitable for the higher bandwidth video signals from a DVD chip. Broadcast video signals actually require less bandwidth because of channel limitations: NTSC signals have 4.2MHz bandwidth, and PAL signals have 5MHz bandwidth. Video signals from a DVD player are not channel limited; therefore, the bandwidth of DVD video signals can push right against the Nyquist limit of 6.75MHz. (Recommendation ITU-R BT.601-5 specifies 13.5MHz as the sampling rate for standard-definition video). Therefore, the maximum bandwidth of the signal is 6.75MHz. To ease the filtering requirements, most modern video systems oversample by two times, clocking the video current DAC at 27MHz.
Shutdown
When SHDN is low, the MAX9512 draws less than 1A supply current. All the amplifier outputs become high impedance. The effective output resistance at the video outputs is 28k, due to the internal feedback resistors to ground.
Applications Information
Reducing Power Consumption in the Video DACs
YIN and CIN have high-impedance input buffers and can work with source resistances as high as 300. To reduce power dissipation in the video DACs, the DAC output resistor can be scaled up in value. The reference resistor that sets the reference current inside the video DACs must also be similarly scaled up. For instance, if the output resistor is 37.5, the DAC must source 26.7mA when the output is 1V. If the output resistor is increased to 300, the DAC only needs to source 3.33mA when the output is 1V. There is parasitic capacitance from the DAC output to ground. That capacitance in parallel with the DAC output resistor forms a pole that can potentially roll off the frequency response of the video signal. For example, 300 in parallel with 50pF creates a pole at 10.6MHz. To minimize this capacitance, reduce the area of the signal trace attached to the DAC output as much as possible, and place the MAX9512 as close to the video DAC outputs as possible.
Y/C Mixer
The Y/C mixer adds the luma and chroma signals together to create a composite video signal. Since chroma is a phase modulated carrier at 3.58MHz for NTSC and 4.43MHz for PAL, the chroma signal is ACcoupled into the Y/C mixer so that the variation in blank level from one video source to another video source does not affect the DC bias of the composite video signal. The highpass corner frequency of the chroma ACcoupling circuit is 300kHz.
Outputs
The video output amplifiers can both source and sink load current, allowing output loads to be DC- or ACcoupled. The amplifier output stage needs about 300mV of headroom from either supply rail. The MAX9512 has an internal level shift circuit that positions the sync tip at approximately 300mV at the output. The
14
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Video Filter Amplifier with SmartSleep and Y/C Mixer Circuit
AC-Coupling the Outputs
The outputs can be AC-coupled since the output stage can source and sink current as shown in Figure 6. Coupling capacitors should be 220F or greater to keep the highpass filter formed by the 150 equivalent resistance of the video transmission line to a corner frequency of 4.8Hz or below. The frame rate of PAL systems is 25Hz, and the frame rate of NTSC systems is 30Hz. The corner frequency should be well below the frame rate. Smartsleep only works with DC-coupled loads.
Power-Supply Bypassing and Ground
The MAX9512 operates from a single-supply voltage down to 2.7V, allowing for low-power operation. Bypass VDD to GND with a 0.1F capacitor. Place all external components as close to the device as possible.
MAX9512
+3.3V
0.1F VDD VIDEO ENCODER BUFFER CURRENT DAC CIN LPF 6dB LOAD SENSE COUT 75 220F CHROMA
BUFFER CURRENT DAC YIN LPF 6dB
LOAD SENSE YOUT 75 220F LUMA
LOAD SENSE ACTIVE VIDEO DETECT 0V +3.3V SMARTSLEEP SHDN CONTROL LOGIC LOAD SENSE 6dB CVBSOUT2 75 6dB CVBSOUT1 75
220F CVBS1
220F CVBS2
MAX9512
GND
Figure 6. AC-Coupling at the Outputs
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15
Video Filter Amplifier with SmartSleep and Y/C Mixer Circuit MAX9512
Block Diagrams (continued)
BUFFER CIN LPF 6dB
LOAD SENSE COUT
0 TO 50mV YIN
LOAD SENSE BUFFER LPF 6dB YOUT
300mV TO 400mV
ACTIVE VIDEO DETECT SMARTSLEEP SHDN CONTROL LOGIC 6dB
LOAD SENSE CVBSOUT1
LOAD SENSE
MAX9512
6dB
CVBSOUT2
Chip Information
PROCESS: BiCMOS
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Video Filter Amplifier with SmartSleep and Y/C Mixer Circuit
Package Information
For the latest package outline information and land patterns, go to www.maxim-ic.com/packages. PACKAGE TYPE 16 TQFN-EP PACKAGE CODE T1633-4 DOCUMENT NO. 21-0136
12x16L QFN THIN.EPS
MAX9512
MARKING
E E/2
(ND - 1) X e
(NE - 1) X e
D2/2
D/2 D
AAAA
C L
e D2
k
b E2/2
0.10 M C A B
C L
L
E2
0.10 C
0.08 C A A2 A1 L
C L
C L
L
e
e
PACKAGE OUTLINE 8, 12, 16L THIN QFN, 3x3x0.8mm
21-0136
I
1 2
______________________________________________________________________________________
17
Video Filter Amplifier with SmartSleep and Y/C Mixer Circuit MAX9512
Package Information (continued)
For the latest package outline information and land patterns, go to www.maxim-ic.com/packages.
PKG REF. A b D E e L N ND NE A1 A2 k 0.25 0 0.35
8L 3x3 MIN. NOM. MAX. 0.70 0.25 2.90 2.90 0.75 0.30 3.00 3.00 0.55 8 2 2 0.02 0.20 REF 0.25 0.05 0 0.80 0.35 3.10 3.10 0.75
12L 3x3 MIN. NOM. MAX. 0.70 0.20 2.90 2.90 0.45 0.75 0.25 3.00 3.00 0.50 BSC. 0.55 12 3 3 0.02 0.20 REF 0.25 0.05 0 0.65 0.30 0.80 0.30 3.10 3.10
16L 3x3 MIN. NOM. MAX. 0.70 0.20 2.90 2.90 0.75 0.25 3.00 3.00 0.40 16 4 4 0.02 0.20 REF 0.05 0.80 0.30 3.10 3.10 0.50 PKG. CODES TQ833-1 T1233-1 T1233-3 T1233-4 T1633-2 T1633F-3 T1633FH-3 T1633-4 T1633-5
EXPOSED PAD VARIATIONS
D2 MIN. 0.25 0.95 0.95 0.95 0.95 0.65 0.65 0.95 0.95 NOM. 0.70 1.10 1.10 1.10 1.10 0.80 0.80 1.10 1.10 MAX. 1.25 1.25 1.25 1.25 1.25 0.95 0.95 1.25 1.25 MIN. 0.25 0.95 0.95 0.95 0.95 0.65 0.65 0.95 0.95 E2 NOM. 0.70 1.10 1.10 1.10 1.10 0.80 0.80 1.10 1.10 MAX. 1.25 1.25 1.25 1.25 1.25 0.95 0.95 1.25 1.25 PIN ID 0.35 x 45 0.35 x 45 0.35 x 45 0.35 x 45 0.35 x 45 0.225 x 45 0.225 x 45 0.35 x 45 0.35 x 45 JEDEC WEEC WEED-1 WEED-1 WEED-1 WEED-2 WEED-2 WEED-2 WEED-2 WEED-2
0.65 BSC.
0.50 BSC.
NOTES: 1. 2. 3. 4. DIMENSIONING & TOLERANCING CONFORM TO ASME Y14.5M-1994. ALL DIMENSIONS ARE IN MILLIMETERS. ANGLES ARE IN DEGREES. N IS THE TOTAL NUMBER OF TERMINALS. THE TERMINAL #1 IDENTIFIER AND TERMINAL NUMBERING CONVENTION SHALL CONFORM TO JESD 95-1 SPP-012. DETAILS OF TERMINAL #1 IDENTIFIER ARE OPTIONAL, BUT MUST BE LOCATED WITHIN THE ZONE INDICATED. THE TERMINAL #1 IDENTIFIER MAY BE EITHER A MOLD OR MARKED FEATURE. DIMENSION b APPLIES TO METALLIZED TERMINAL AND IS MEASURED BETWEEN 0.20 mm AND 0.25 mm FROM TERMINAL TIP. ND AND NE REFER TO THE NUMBER OF TERMINALS ON EACH D AND E SIDE RESPECTIVELY. DEPOPULATION IS POSSIBLE IN A SYMMETRICAL FASHION. COPLANARITY APPLIES TO THE EXPOSED HEAT SINK SLUG AS WELL AS THE TERMINALS . DRAWING CONFORMS TO JEDEC MO220 REVISION C. MARKING IS FOR PACKAGE ORIENTATION REFERENCE ONLY. NUMBER OF LEADS SHOWN ARE FOR REFERENCE ONLY. WARPAGE NOT TO EXCEED 0.10mm.
5. 6. 7. 8. 9. 10. 11. 12.
PACKAGE OUTLINE 8, 12, 16L THIN QFN, 3x3x0.8mm
21-0136
I
2 2
18
______________________________________________________________________________________
Video Filter Amplifier with SmartSleep and Y/C Mixer Circuit
Revision History
REVISION NUMBER 1 2 REVISION DATE 5/1/06 2/09 Initial release Removed QSOP package DESCRIPTION PAGES CHANGED -- 1, 2, 3, 16, 17, 18
MAX9512
Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.
Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 ____________________ 19
(c) 2009 Maxim Integrated Products Maxim is a registered trademark of Maxim Integrated Products, Inc.

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