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19-0402; Rev 0; 6/95
K ATION EVALU BLE AVAILA
IT
330MHz Buffered Video Switches/ Crosspoint Building Blocks
____________________________Features
o -3dB Bandwidth of 330MHz o 0.1dB Gain Flatness of 150MHz o 700V/s Slew Rate o 0.01/0.01% Differential Phase/Gain o Low Power: 5.5mA Max o -92dB Crosstalk and -78dB Off Isolation at 30MHz o High-Z Outputs when Disabled o 3pF Input Capacitance o Ultra-Low Switching Glitch o On-Board Control Logic
_______________General Description
The MAX4111/MAX4121/MAX4221 wideband video switches are optimized for high-definition, broadcastquality, composite (HDTV, NTSC, PAL, SECAM, and RGB) video switching arrays. Their open-loop buffer amplifiers offer 0.1dB gain flatness to 150MHz. They operate from 5V supplies and feature differential phase and gain error of only 0.01/0.01%, respectively. The ultra-low switching glitch (13mV) is positive to avoid confusion with any sync pulse. Ideal as building blocks in large arrays, these devices feature a constant, high input impedance and a disable function that puts the outputs into a high-impedance state and reduces the operating current to only 250A. The open-loop architecture allows the outputs to drive capacitive loads without oscillation. Other key features include -92dB crosstalk and -78dB isolation (MAX4121). The MAX4111/MAX4121/MAX4221 are offered in narrow plastic DIP and SO packages. See the table below for key features:
PART DESCRIPTION PINS 8 8 16 MAX4111 SPST, single-input, single-output switch MAX4121 SPDT, 2-input, single-output switch MAX4221 Dual, SPDT, 2-input, single-output switch
MAX4111/MAX4121/MAX4221
______________Ordering Information
PART MAX4111CSA MAX4121CSA MAX4221CSE TEMP. RANGE 0C to +70C 0C to +70C 0C to +70C PIN-PACKAGE 8 SO 8 SO 16 Narrow SO
________________________Applications
Video-Router and Crosspoint Arrays Broadcast/HDTV-Quality Color Signal Multiplexing RF and IF Routing Graphics Color-Signal Routing Telecom Routing Data Acquisition
___________________________________Pin Configurations/Functional Diagrams
TOP VIEW
IN0 1 GND 1 IN 2 GND 3 N.C. 4 8 7 6 A0 1 EN IN0 2 VCC OUT VEE GND 3 IN1 4 6 5 7 VCC OUT VEE 8 EN GND 2 IN1 3 GND 4 GND 5 IN2 6 GND 7 IN3 8 16 SEL0 15 SEL1 14 VCC 13 OUT0 12 VEE 11 OUT1 10 SEL2 9 SEL3
MAX4111
5
MAX4121
SO
SO
MAX4221
Narrow SO
________________________________________________________________ Maxim Integrated Products
1
Call toll free 1-800-998-8800 for free samples or literature.
330MHz Buffered Video Switches/ Crosspoint Building Blocks MAX4111/MAX4121/MAX4221
ABSOLUTE MAXIMUM RATINGS
Supply Voltages VCC ....................................................................................+6V VEE ......................................................................................-6V VCC-VEE ...........................................................................+12V Analog Input Voltage .......................(VEE - 0.3V) to (VCC + 0.3V) Digital Input Voltage ...................................-0.3V to (VCC + 0.3V) Duration of Short Circuit to Ground............................Continuous Continuous Power Dissipation (TA = +70C) 8-Pin SO (derate 5.88mW/C above +70C)................471mW 16-Pin Narrow SO (derate 8.70mW/C above +70C) ...696mW Operating Temperature Range...............................0C to +70C Storage Temperature Range .............................-65C to +160C Junction Temperature ......................................................+150C Lead Temperature (soldering, 10sec) .............................+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
PARAMETER DC PARAMETERS Operating Supply Voltage Operating Supply Current Disabled Supply Current Input Voltage Range Input Bias Current Input Resistance Input Capacitance Output Offset Voltage Power-Supply Rejection Ratio Voltage Gain Output Resistance Disabled Output Current Disabled Output Resistance Disabled Output Capacitance Logic Input High Voltage Logic Input Low Voltage Logic Input High Current Logic Input Low Current VS ICC, IEE ICC, IEE VIN IB RIN CIN VOS PSRR AV ROUT IOUT(OFF) ROUT(OFF) COUT(OFF) VINH VINL IINH IINL SYMBOL
(VS = 5V, -2.5V VIN +2.5V, RL = 5k, CL 5pF, TA = 0C to +70C, unless otherwise noted. Typical values are at TA = +25C.) CONDITIONS MIN 4.5 Per channel MAX4111/MAX4121 MAX4221 2.5 VIN = 0V Channel selected Channel disabled VIN = 0V, channel enabled or disabled TA = +25C TA = TMIN to TMAX VS = 4.5V to 5.5V VIN = 2.5V f = DC to 50MHz VOUT = 0V TA = +25C TA = TMIN to TMAX 50 0.98 0.97 20 10 30 5 VS = 4.5V to 5.5V VS = 4.5V to 5.5V VS = 4.5V to 5.5V VS = 4.5V to 5.5V 2.0 0.8 10 10 1.0 1.0 Channel selected Channel disabled 2.5 0.02 0.4 100 3 5 10 15 4.0 TA = +25C TA = TMIN to TMAX 150 250 TYP 5.0 4.0 MAX 5.5 5.5 6.5 200 350 UNITS V mA A V A M pF mV dB V/V nA M pF V V A A
2
_______________________________________________________________________________________
330MHz Buffered Video Switches/ Crosspoint Building Blocks
ELECTRICAL CHARACTERISTICS
PARAMETER AC PARAMETERS Slew Rate Full-Power Bandwidth (Note 1) -3dB Bandwidth Gain Flatness Gain Peaking Small-Signal Rise Time Differential Gain (Note 2) Differential Phase (Note 2) All-Hostile Crosstalk tr/tf DG DP VIN = 0.1Vp-p f = 3.58MHz f = 3.58MHz VIN = 1Vp-p, f = 30MHz VIN = 1Vp-p, f = 30MHz, see test circuit tOFF tON MAX4121 MAX4221 MAX4111 MAX4121 MAX4221 SR FPBW f3dB VOUT = 5Vp-p VOUT = 1.4Vp-p VIN = 1.4Vp-p VIN = 5Vp-p VIN = 0.1Vp-p DC to 30MHz DC to 150MHz 700 500 110 45 330 0.02 0.1 0.08 950 0.01 0.01 -92 -70 86 78 84 1.0 500 13 860 Chip-to-chip, f = 3.58MHz f = 30MHz, VIN = 1.4Vp-p f = 30MHz, VIN = 1.4Vp-p 0.2 -65 -70 s ns mVp-p ps degrees dBc dBc dB dB V/s MHz MHz dB dB ps % degrees dB SYMBOL
MAX4111/MAX4121/MAX4221
(VS = 5V, -2.5V VIN +2.5V, RL = 5k, CL 5pF, TA = 0C to +70C, unless otherwise noted. Typical values are at TA = +25C.) CONDITIONS MIN TYP MAX UNITS
Off Isolation Channel Switching Off Time Channel Switching On Time Switching Transient Group Delay Input-Output Delay Matching Second Harmonic Third Harmonic Note 1: Note 2:
Full-Power Bandwidth is inferred from Slew Rate (SR) testing by the equation SR = EP, where EP is the peak output voltage and =2f. Differential Gain and Phase are tested using a modulated ramp, 100IRE (0.714V).
_______________________________________________________________________________________
3
330MHz Buffered Video Switches/ Crosspoint Building Blocks MAX4111/MAX4121/MAX4221
__________________________________________Typical Operating Characteristics
(VS = 5V, RL = 5k, CL 5pF, TA = +25C, unless otherwise noted.)
GAIN vs. FREQUENCY
MAX4111 TOC-01
GAIN FLATNESS
MAX4111 TOC-02
OUTPUT RESISTANCE vs. FREQUENCY
MAX4111 TOC-03
2 0 -2 -4 GAIN (dB)
0.3 0.2 0.1 0 GAIN (dB) -0.1 -0.2 -0.3 -0.4 -0.5 -0.6 -0.7
40
OUTPUT RESISTANCE ()
30
-6 -8 -10 -12 -14 -16 -18 1 10 100 1000 FREQUENCY (MHz)
20
10
0 1 10 100 1000 0.1 1 10 FREQUENCY (MHz) 100 500 FREQUENCY (MHz)
POWER-SUPPLY REJECTION RATIO vs. FREQUENCY
MAX4111 TOC-04
MAX4121 ALL-HOSTILE CROSSTALK vs. FREQUENCY
MAX4111 TOC-05
MAX4221 ALL-HOSTILE CROSSTALK vs. FREQUENCY
40 20 AMPLITUDE (dB) 0 -20 -40 -60 -80 -100 -120 -140
MAX4111 TOC-06
-10 0 10 AMPLITUDE (dB) 20 30 40 50 60 70 80 90 10k 100k 1M FREQUENCY (Hz) 10M VCC VEE
40 20 0 AMPLITUDE (dB) -20 -40 -60 -80 -100 -120 -140 -160
60
100M
1
10
100
1000
1
10
100
1000
FREQUENCY (MHz)
FREQUENCY (MHz)
MAX4111 OFF ISOLATION vs. FREQUENCY
MAX4111 TOC-07
MAX4121 OFF ISOLATION vs. FREQUENCY
MAX4111 TOC-08
MAX4221 OFF ISOLATION vs. FREQUENCY
-40 -20 AMPLITUDE (dB) 0 20 40 60 80 100 120 140
MAX4111 TOC-09
-40 -20 0 AMPLITUDE (dB) 20 40 60 80 100 120 140 160 1 10 100
-40 -20 0 AMPLITUDE (dB) 20 40 60 80 100 120 140 160
-60
1000
1
10
100
1000
1
10
100
1000
FREQUENCY (MHz)
FREQUENCY (MHz)
FREQUENCY (MHz)
4
_______________________________________________________________________________________
330MHz Buffered Video Switches/ Crosspoint Building Blocks
____________________________Typical Operating Characteristics (continued)
(VS = 5V, RL = 5k, CL 5pF, TA = +25C, unless otherwise noted.)
MAX4111/MAX4121/MAX4221
SMALL-SIGNAL PULSE RESPONSE
(RL = 5k)
MAX14111 TOC-10
LARGE-SIGNAL PULSE RESPONSE
(RL = 5k)
MAX14111 TOC-11
IN
GND
IN (2.5V/div)
GND
VOLTS (100mV/div) GND OUT
VOLTS GND OUT (1V/div)
TIME (5ns/div)
TIME (5ns/div)
SMALL-SIGNAL PULSE RESPONSE
(CL = 47pF, RL = open)
MAX14111 TOC-12
LARGE-SIGNAL PULSE RESPONSE
(CL = 47pF, RL = open)
MAX14111 TOC-13
IN
GND
IN 2.5V/div
GND
VOLTS (100mV/div) GND OUT
VOLTS OUT (1V/div) GND
TIME (5ns/div)
TIME (10ns/div)
ENABLE/DISABLE DELAY TIME
(INPUT = 1.1V)
MAX14111 TOC-14
OUTPUT GLITCH AMPLITUDE
MAX14111 TOC-15
ENABLE 2V/div OUTPUT
AMPLITUDE
2V/div
A0
GND OUT 1V/div
10mV/div
OUTPUT
TIME (1s/div) TIME (1s/div)
_______________________________________________________________________________________
5
330MHz Buffered Video Switches/ Crosspoint Building Blocks MAX4111/MAX4121/MAX4221
____________________________Typical Operating Characteristics (continued)
(VS = 5V, RL = 5k, CL 5pF, TA = +25C, unless otherwise noted.)
NOISE VOLTAGE vs. FREQUENCY
MAX4111 TOC-16
SUPPLY CURRENT vs. TEMPERATURE
MAX4111 TOC-17
GAIN vs. INPUT VOLTAGE AND TEMPERATURE
TA = 0C -0.090 TA = +25C GAIN (dB) -0.095
MAX4111 TOC-18
100
5.0 4.8 SUPPLY CURRENT (mA) 4.6 4.4 4.2 4.0 3.8 3.6 IEE ICC
-0.085
NOISE VOLTAGE (nV Hz)
30
10
-0.100
TA = +70C
3
-0.105 -0.110 0 10 20 30 40 50 60 70 -3 -2 -1 0 1 2 3 TEMPERATURE (C) INPUT VOLTAGE (V)
1 1 100 10k 1M 100M 10G FREQUENCY (Hz)
3.4
BANDWIDTH vs. LOAD CAPACITANCE
RL = OPEN 300 BANDWIDTH (MHz) 250 200 150 -3dB BW 100 50 0 0 20 40 60 80 100 LOAD CAPACITANCE (pF) GAIN (dB)
MAX4111 TOC-19
GAIN vs. LOAD RESISTANCE
-0.2 -0.4 -0.6 -0.8 -1.0 -1.2
MAX4111 TOC-20
350
0
-0.1dB BW
-1.4 -1.6 0 1 2 RL(k) 3 4 5
6
_______________________________________________________________________________________
330MHz Buffered Video Switches/ Crosspoint Building Blocks
______________________________________________________________Pin Description
PIN MAX4111 1, 3 -- 2 -- 4 5 6 -- 7 8 MAX4121 3 1 -- 2, 4 -- 5 6 -- 7 8 MAX4221 2, 4, 5, 7 -- -- 1, 3 -- 12 -- 6, 8 14 -- NAME GND A0 IN IN0, IN1 N.C. VEE OUT IN2, IN3 VCC EN SEL3, SEL2 OUT1, OUT0 SEL1, SEL0 FUNCTION Analog (signal) ground. Since inputs are isolated by these grounds, GND should be as noise-free as possible. Logic Input. Channel Selection Bit for the 2x1. See Table 2. Signal Input Signal Input No Connect--not internally connected Negative Power-Supply Voltage. Connect to -5V. Decouple to power ground. Signal Output Signal Inputs for the dual 2x1 switch Positive Power-Supply Voltage. Connect to +5V. Decouple to power ground. Logic Input. Output Enable for the 1x1, 2x1 switches. A logic high on this pin enables the output. A logic low causes the output to assume a highimpedance state, and reduces supply current. Logic Inputs. Channel Selection Bits for OUT1 of the dual 2x1 (MAX4221). See Table 3. Signal Outputs Logic Inputs. Channel Selection Bits for OUT0 of the dual 2x1 (MAX4221). See Table 3.
MAX4111/MAX4121/MAX4221
-- -- --
-- -- --
9, 10 11, 13 15, 16
_______________Detailed Description
The MAX4111/MAX4121/MAX4221 video switches are manufactured with Maxim's proprietary, ultra-high frequency, complementary bipolar process that yields high bandwidth and low capacitance. Make-beforebreak switching is used to reduce noise and glitches, even when switching from part to part in large arrays. The input buffers provide a constant high input impedance, and prevent the make-before-break action from feeding back to the input.
The design of the switching mechanism limits the inevitable glitch to less than 13mVp-p. In addition, the glitch pulse is positive to avoid confusion with negative sync pulses. Unity-gain buffers isolate other inputs from the switching action of large multiplex arrays. These buffers can drive 5k resistive loads. In addition, these devices drive capacitive loads without oscillation. Load capacitance is limited only by system bandwidth requirements. The MAX4111/MAX4121/MAX4221 do not contain buffer latches. The digital inputs are transparent.
_______________________________________________________________________________________
7
330MHz Buffered Video Switches/ Crosspoint Building Blocks MAX4111/MAX4121/MAX4221
Table 1. MAX4111 Truth Table
EN 0 1 OUT High-Z IN
Table 2. MAX4121 Truth Table
A0 X 0 1 EN 0 1 1 OUT High-Z IN0 IN1
* In general, surface-mount components have shorter leads and lower parasitic reactance, and give better high-frequency performance than through-hole components. * The PC board should have at least two layers, with one side a signal side and the other a ground plane. * Keep signal lines as short and straight as possible. Do not make 90 turns; round all corners. * The ground plane should be as free from voids as possible.
Bypass Components--Capacitors
Surface-mount ceramic capacitors are recommended to achieve good high-frequency bypassing. A 0.1F capacitor in parallel with a 1000pF capacitor should be used for each supply. The capacitors should be located as close to the ICs supply pins as possible, with the smaller value capacitor being closer to the IC than the other.
Table 3. MAX4221 Truth Table
SEL0 0 1 0 1 SEL2 0 1 0 1 SEL1 0 0 1 1 SEL3 0 0 1 1 OUT0 High-Z IN0 IN1 NA OUT1 High-Z IN2 IN3 NA
Creating Larger Arrays
The MAX4111/MAX4121/MAX4221 were designed as building blocks for larger arrays. The single-pole switch allows the system designer much greater control over crosstalk than multiple switches in a single IC. For this reason, cable drivers have not been included in the switch design because of the high-power drive required (see Figure 6). Even though the stability of these devices is not worsened by adding capacitance, you may want to limit the number of switches connected together. The MAX4111/MAX4121/MAX4221 have a finite input capacitance of about 3pF and a dynamic output resistance of about 20. This causes a pole at a little more than 2.7GHz. However, in a large array with many switch inputs, the total capacitance is N x 3pF, where "N" is the number of switches connected in parallel. The pole will be located at: 1 MHz 2 x (N x 3pF + CSTRAY ) x 20 CSTRAY = Stray capacitance at the interconnect If the maximum number of switches that may be connected while still maintaining bandwidth is less than your system requirements, use a unity-gain buffer amplifier to isolate the switch from the remainder of the inputs.
Note: SEL0 = SEL1 = 1 and/or SEL2 = SEL3 = 1 is not allowed. Enabling these states will not damage the device, but may cause excessive supply currents and distortion.
__________Applications Information
Grounding, Bypassing, and PC Board Layout
To obtain the full 330MHz bandwidth of these switches, Microstrip and Stripline techniques are recommended. To ensure your PC board does not degrade the switch's performance, it's wise to design the board for a frequency greater than 1GHz. Even with very short runs, it's good practice to use this technique at critical points such as inputs and outputs. Use the following guidelines when designing the board: * Do not use wire-wrap boards, because they are too inductive. * Do not use IC sockets. They increase parasitic capacitance and inductance.
8
_______________________________________________________________________________________
330MHz Buffered Video Switches/ Crosspoint Building Blocks
_________________________________________________________________Test Circuits
MAX4111/MAX4121/MAX4221
MAX4111
NETWORK ANALYZER 50 20
* 20 RESISTOR USED TO SIMULATE THE OUTPUT OF AN ON SWITCH. IN THIS WAY, OPERATION IN AN ARRAY IS SIMULATED.
Figure 1. MAX4111 Off Isolation
HIGH-IMPEDANCE PROBE
NETWORK ANALYZER
MAX4121
Figure 2. MAX4121 All-Hostile Crosstalk
HIGH-IMPEDANCE PROBE 20
NETWORK ANALYZER
MAX4121
* 20 RESISTOR USED TO SIMULATE THE OUTPUT OF AN ON SWITCH. IN THIS WAY, OPERATION IN AN ARRAY IS SIMULATED.
Figure 3. MAX4121 Off Isolation
_______________________________________________________________________________________ 9
330MHz Buffered Video Switches/ Crosspoint Building Blocks MAX4111/MAX4121/MAX4221
50
HIGH-IMPEDANCE PROBE
NETWORK ANALYZER
50
HIGH-IMPEDANCE PROBE 20
NETWORK ANALYZER
50
50
50
50
50
50
MAX4221
MAX4221
* 20 RESISTOR USED TO SIMULATE THE OUTPUT OF AN ON SWITCH. IN THIS WAY, OPERATION IN AN ARRAY IS SIMULATED.
Figure 4. MAX4221 All-Hostile Crosstalk
Figure 5. MAX4221 Off Isolation
10
______________________________________________________________________________________
330MHz Buffered Video Switches/ Crosspoint Building Blocks MAX4111/MAX4121/MAX4221
IN0A 75 1 2 IN1A 75 4 75 IN0B 75 IN1B 5 6 7 8 3 16 15 14 VCC 13 12 VEE 11 10 9 SEL0B SEL1B OUTB OUTA SEL0A SEL1A
MAX4221
IN2A
75
1 2
16 15 14 VCC 13 12 VEE 11 10 9
SEL2A SEL3A
IN3A 75
3 4 75 5 6 7 75
IN2B
SEL2B SEL3B
IN3B
8
MAX4221
IN4A
75
1 2
16 15 14 VCC 13 12 VEE 11 10 9
SEL4A SEL5A
IN5A 75
3 4 75 5 6 7 75
IN4B
SEL4B SEL5B
IN5B
8
MAX4221
IN6A
75
1 2
16 15 14 VCC 13 12 VEE 11 10 9
SEL6A SEL7A
IN7A 75
3 4 75 5 6 7 75
IN6B
SEL6B = SIGNAL GROUND SEL7B POWER- SUPPLY BYPASSING NOT SHOWN.
IN7B
8
MAX4221
Figure 6. 8x2 Multiplexer Using MAX4221
______________________________________________________________________________________ 11
330MHz Buffered Video Switches/ Crosspoint Building Blocks MAX4111/MAX4121/MAX4221
________________________________________________________Package Information
DIM INCHES MAX MIN 0.069 0.053 0.010 0.004 0.019 0.014 0.010 0.007 0.157 0.150 0.050 0.244 0.228 0.050 0.016 MILLIMETERS MIN MAX 1.35 1.75 0.10 0.25 0.35 0.49 0.19 0.25 3.80 4.00 1.27 5.80 6.20 0.40 1.27
D A e B
0.101mm 0.004in.
0-8
A1
C
L
A A1 B C E e H L
E
H
Narrow SO SMALL-OUTLINE PACKAGE (0.150 in.)
DIM PINS D D D 8 14 16
INCHES MILLIMETERS MIN MAX MIN MAX 0.189 0.197 4.80 5.00 0.337 0.344 8.55 8.75 0.386 0.394 9.80 10.00
21-0041A
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.
12 __________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 (408) 737-7600 (c) 1995 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.

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