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FEATURES 250 MSPS Update Rate Low Glitch Impulse Complete Composite Functions Internal Voltage Reference Single -5.2 V Supply APPLICATIONS Raster Scan Displays Color Graphics Automated Test Equipment TV Video Reconstruction
250 MSPS Video Digital-to-Analog Converter AD9701
FUNCTIONAL BLOCK DIAGRAM
GENERAL DESCRIPTION
The AD9701 is a high speed, 8-bit digital-to-analog converter with fully integrated composite video functions. High speed ECL input registers provide synchronous operation of data and control functions up to 250 MSPS. The AD9701 incorporates onboard control functions including horizontal sync, blanking, reference white level and a 10% bright signal for highlighting. The setup level is also adjustable from 0 IRE units to 20 IRE units through the control pin. An internal voltage reference allows the AD9701 to operate as a stand-alone video reconstruction DAC. The AD9701 is available as an industrial temperature range device, -25C to +85C, and as an extended temperature range
device, -55C to +125C. Both grades of the AD9701 are packaged in a 22-pin ceramic DIP with the extended temperature device also available in a 28-pin LCC package.
PIN CONFIGURATIONS
REV. A
Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 617/329-4700 World Wide Web Site: http://www.analog.com Fax: 617/326-8703 (c) Analog Devices, Inc., 1996
AD9701-SPECIFICATIONS
ABSOLUTE MAXIMUM RATINGS 1
Supply Voltage (-VS) . . . . . . . . . . . . . . . . . . . . . . . . . . . . -7 V Digital Input Voltages (Including STROBE, SYNC, BLANKING, 10% BRIGHT and REFERENCE WHITE) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0 V to -VS Analog Output Current . . . . . . . . . . . . . . . . . . . . . . . . 37 mA Power Dissipation (+25C Free Air)2 . . . . . . . . . . . . 780 mW
Operating Temperature Range AD9701BQ . . . . . . . . . . . . . . . . . . . . . . . . -25C to +85C AD9701SQ/SE . . . . . . . . . . . . . . . . . . . . . -55C to +125C Storage Temperature Range . . . . . . . . . . . . -65C to +150C Junction Temperature . . . . . . . . . . . . . . . . . . . . . . . . +175C Lead Soldering Temperature (10 sec) . . . . . . . . . . . . +300C
ELECTRICAL CHARACTERISTICS (Supply Voltages = -5.2 V; R = 37.5
L
; Setup = 0 V, unless otherwise noted)
Min 8 AD9701SQ/SE Typ Max Units Bits 0.5 1.0 0.25 0.5 1.0 Guaranteed 0.05 2 50 0.9 0.9 0.25 LSB LSB LSB LSB
Parameter RESOLUTION DC ACCURACY Differential Linearity Integral Linearity Monotonicity INITIAL OFFSET ERROR3 Zero-Scale Offset Error4 Zero-Scale Offset Drift Coefficient Full-Scale Drift Coefficient ANALOG OUTPUT Voltage Output5 10% Bright6 Reference White Blanking (Setup = 0 IRE)7 Sync (Setup = 0 IRE)8 Current Output5 10% Bright6 Reference White Blanking (Setup = 0 IRE)7 Sync (Setup = 0 IRE)8 Output Compliance Range Output Resistance DYNAMIC PERFORMANCE Update Rate Output Propagation Delay9 Output Settling Time10 Current Voltage Output Slew Rate11 Output Rise Time11 Output Fall Time11 Glitch Impulse SETUP CONTROL12 Setup Level (Grounded) Setup Level (Open) Setup Level (Tied to -5.2 V with 1 k) Setup Level (-5.2 V) DIGITAL INPUTS Logic "1" Voltage Logic "0" Voltage Logic "1" Current Logic "0" Current Input Capacitance Data Setup Time Data Hold Time
Temp
Min 8
AD9701BQ Typ Max
+25C Full +25C Full Full +25C Full Full Full
0.5 1.0 0.25 0.5 1.0 Guaranteed 0.05 2 50 0.9 0.9
0.25
mV mV V/C V/C
Full Full Full Full Full Full Full Full Full +25C +25C +25C +25C +25C +25C +25C +25C +25C Full Full Full Full Full Full Full Full +25C +25C +25C
-0.9 -67.45 -698.55 -979.25 -0.024 -1.805 -18.63 -26.11 640 225
0 -71 -708.5 -993.5
-74.55 -718.45 -1007.75
-0.9 -67.45 -698.55 -979.25 -0.024 -1.805 -18.63 -26.11 640 225
0 -71 -708.5 -993.5
-74.55 -718.45 -1007.75
mV mV mV mV mA mA mA mA V MSPS ns ns ns V/s ns ns pV-s IRE IRE IRE IRE V V A A pF ns ns REV. A
0 -1.9 -1.996 -18.9 -19.16 -26.5 -26.87 -1.6; +0.1 800 250 5 8 12 300 1.7 1.7 60 0 7.5 10 20
0 -1.9 -1.995 -18.9 -19.16 -26.5 -26.87 -1.6; +0.1 800 250 5 8 12 300 1.7 1.7 60 0 7.5 10 20
6
6
255
255 2.0 2.0 70
2.0 2.0 70
-1.1 -1.5 100 15 5.5
-1.1 -1.5 100 15 5.5
4 0.1 1.4 -2-
4 0.1 1.4
AD9701 AD9701
Parameter POWER SUPPLY Supply Current (-5.2 V) Nominal Power Dissipation Power Supply Rejection Ratio14
13
Temp +25C Full +25C Full
Min
AD9701BQ Typ Max 140 728 3 160 160 6
Min
AD9701SQ/SE Typ Max 140 728 3 160 160 6
Units mA mA mW mV/V
NOTES 1 Absolute maximum ratings are limiting values to be applied individually, and beyond which serviceability of the circuit may be impaired. Functional operability under any of these conditions is not necessarily implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. 2 Typical thermal impedance . . . 22-Pin Ceramic JA = 64C/W; JC = 16C/W 28-Pin Ceramic LCC JA = 70C/W JC = 21C/W 3 SYNC, BLANKING, and REFERENCE WHITE are inactive (Logic "1"). I SET 1.26 V/RSET. 4 All bits at logic HIGH. 5 All values are relative to full-scale output after being normalized to nominal value. Typical variation in full-scale output from device to device can reach 10%, for a fixed RSET resistor. 6 The effect of 10% BRIGHT algebraically adds to the output waveform. 7 The output level with BLANKING active (Logic "0") is determined by the setup control level. 8 In normal operation, the BLANKING input is activated (Logic "0") prior to or in conjunction with the SYNC input. The effect of the SYNC output is relative to the setup level. 9 Measured from edge of STROBE to 50% transition point of the output signal. 10 Measured with full-scale change in output level, from the 10% transition level to within 0.2% of the final output value. 11 Measured from 10% to 90% transition point for full-scale step output. 12 An IRE unit is 1% of the Grey Scale (GS range) with a 0 IRE setup level. 13 Supply Voltage should remain stable within 5% for normal operation. 14 Measured at 5% of -VS. Specifications subject to change without notice.
DIGITAL INPUTS VS. ANALOG OUTPUT
Bit 1 1 1 1 0 0 X X X X X X X X X X X X X X
Bit 2 1 1 0 0 0 X X X X X X X X X X X X X X
Bit 3 1 1 0 0 0 X X X X X X X X X X X X X X
Bit 4 1 1 0 0 0 X X X X X X X X X X X X X X
Bit 5 1 1 0 0 0 X X X X X X X X X X X X X X
Bit 6 1 1 0 0 0 X X X X X X X X X X X X X X
Bit 7 1 1 0 0 0 X X X X X X X X X X X X X X
Bit 8 1 1 0 0 0 X X X X X X X X X X X X X X
10% Bright 0 1 0 0 1 0 1 0 0 0 0 0 0 0 0 1 1 1 1
Ref. White 1 1 1 1 1 0 0 1 1 1 1 1 1 1 1 1 1 1 1
Blanking 1 1 1 1 1 1 1 0 0 0 0 0 0 0 0 0 0 0 0
Comp. Sync 1 1 1 1 1 1 1 1 1 1 1 0 0 0 0 0 0 0 0
Analog Output (mV) 0 -71 -320 -637.5 -708.5 0 -71 -637.501 -690.752 -708.503 -779.504 -922.501 -975.752 -993.503 -1064.504 -993.501 -1046.752 -1064.503 -1135.504
NOTES 1 Setup (Pin 21) grounded (0 IRE units). 2 Setup (Pin 21) open (7.5 IRE units). 3 Setup (Pin 21) to -5.2 V through 1 k (0 IRE units). 4 Setup (Pin 21) to -5.2 V (20 IRE units).
ORDERING GUIDE
Device AD9701BQ AD9701SE AD9701SQ
Temperature Range -25C to +85C -55C to +125C -55C to +125C
Description 22-Pin DIP, Industrial Temperature 28-Pin LCC, Extended Temperature 22-Pin DIP, Extended Temperature
Package Option* Q-22 E-28A Q-22
*E = Leadless Ceramic Chip Carrier; Q = Cerdip.
REV. A
-3-
AD9701
FUNCTIONAL DESCRIPTION
Pin Name GROUND -VS BIT 1 (MSB) BIT 2-BIT 7 BIT 8 (LSB) STROBE GROUND SETUP
Description One of three ground returns. All grounds should be connected together near the AD9701. Negative supply pin, nominally -5.2 V. One of eight digital input bits. BIT 1 (MSB) is the most-significant-bit of the digital input word. One of eight digital input bits. One of eight digital input bits. BIT 8 (LSB) is the least-significant-bit of the digital input word. Data and control register strobe input. STROBE is leading edge triggered. One of three ground returns. All grounds should be connected together near the AD9701. The SETUP input determines the position of the blanking level relative to the "reference black" level (all data bits at logic "0"). The setup level is adjustable from 0 IRE units to 20 IRE units below the reference black level (an IRE unit is 1% of the "grey scale" range). SETUP LEVEL 0 IRE Units 7.5 IRE Units 10 IRE Units 20 IRE Units CONFIGURATION (PIN 21) Ground Open Connection to -5.2 V through 1 k Connection to -5.2 V
10% BRIGHT COMPOSITE BLANKING COMPOSITE SYNC
REFERENCE WHITE COMPENSATION
CURRENT SET
OUTPUT GROUND
10% BRIGHT adds an additional current to the output level, equal to roughly 10% of the "grey scale" range. The 10% BRIGHT is active logic LOW and operates independently of all other inputs. The COMPOSITE BLANKING input, active logic LOW, forces output to the blanking level set with the SETUP input. The COMPOSITE SYNC input, active LOW, creates a negative going horizontal synchronization pulse relative to the blanking level. Under normal operating conditions, the COMPOSITE BLANKING signal should precede and extend past the COMPOSITE SYNC signal. See SETUP for additional information. The REFERENCE WHITE input, active LOW, overrides the data inputs and forces the output to the maximum "grey scale" level. The COMPENSATION input insures adequate gain stability for the internal reference amplifier. Under normal operating conditions, the COMPENSATION input is decoupled to ground through a 0.1 F capacitor. The CURRENT SET input determines the full-scale or "grey scale" range. The effects of the video control functions are in addition to the "grey scale" range. (168 RSET 600 ). IOUTmax 4 ISET = 4(1.26 V/RSET) Analog output. One of three ground returns. All grounds should be connected together near the AD9701.
SYSTEM TIMING DIAGRAMS
-4-
REV. A
AD9701
DIE LAYOUT AND MECHANICAL INFORMATION
signals are designed to fall below the blanking level so as not to be seen on the monitor. The actual image data is located above the blanking level and it may be further separated from the timing signal by the setup level. The setup level is simply a buffer zone between the timing and image data. Generation of the timing signals for the AD9701 is controlled by the COMPOSITE BLANKING and the COMPOSITE SYNC inputs. In normal operation, the output level of the AD9701 is forced to the blanking level (black) with the COMPOSITE BLANKING control so that when the synchronization occurs, it will not interfere (be seen) with the monitor image. The COMPOSITE SYNC control forces the output level below the blanking level, generating the synchronization pulse. The "grey scale" is the image intensity range located above the blanking level by the amount of the setup level. The setup level is "reference black," the darkest displayable picture intensity. The top of the "grey scale" is "reference white" or the brightest picture intensity. As an 8-bit device, the AD9701 divides the "gray scale" into 256 individual levels.
Die Dimensions . . . . . . . . . . . . . . . . 107 104 15 ( 2) mils Pad Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 4 mils Metalization . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Aluminum Backing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . None Substrate Potential . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -VS Passivation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Oxynitride Die Attach . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Gold Eutectic Bond Wire . . . . . . . 1.25 mil Aluminum; Ultrasonic Bonding or 1 mil Gold; Gold Ball Bonding
APPLICATIONS INFORMATION
Normal raster scan waveforms divide the region between the blanking level and reference white into 100 IRE units (International Radio Engineers). The setup level can range from 0 to 20 IRE units but typically is around 10 IRE units, and the synchronization pulse level typically falls 40 IRE units below the blanking level. For the AD9701, the reference white level is 10 IRE units below the full-scale output range (0 mAOUT). In terms of priority, the REFERENCE WHITE control overrides the data inputs, but both COMPOSITE SYNC and COMPOSITE BLANKING override the data inputs and the REFERENCE WHITE control. A fourth control is active at all times, 10% BRIGHT, which adds approximately 10 IRE units to the output level no matter what the input state of the AD9701. The 10% BRIGHT control is primarily used to highlight areas of the video image. As with any high-speed device, the AD9701 requires a substantial low impedance ground plane and high quality ground connections to achieve the best performance. Performance can also be improved with adequate power supply decoupling near the supply pins of the AD9701. In ECL mode, the output of the AD9701 is designed to drive 75 cable directly, with 75 terminations to ground at both ends of the cable. For TTL configurations, the output should be terminated to +5.0 V through an 82 resistor (see circuit below).
Raster scan video displays image data on a line by line basis, with timing and control signals inserted between the lines. The control signals include the horizontal synchronization pulses, which are used to align the display circuitry at the beginning of each line. After the complete video image is displayed on the monitor, the process begins again with the next image. The vertical reset pulse(s) that initiate this timing sequence are located between each video image.
Raster Graphics Configuration for TTL Systems
The image data is distinguished from the timing information by its location relative to the blanking level. The blanking reference level is at the blackest extreme of the image data and all timing REV. A -5-
Standard Reconstruction Configuration
AD9701
OUTLINE DIMENSIONS
Dimensions shown in inches and (mm).
22-Pin Side-Brazed DIP
22-Pin Ceramic DIP
28-Pin LCC
-6-
REV. A
PRINTED IN U.S.A.
C1127-9-9/87

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