AD8109 Analog Devices, AD8109 Datasheet
AD8109
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AD8109 Summary of contents
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... The AD8108 has a gain of +1, while the AD8109 offers a gain of +2. They operate on voltage supplies of while consuming only idle current. The channel switch- ing is performed via a serial digital control (which can accommo- date “ ...
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... AVCC, Outputs Disabled AVEE, Outputs Enabled, No Load AVEE, Outputs Disabled DVCC f = 100 kHz MHz Operating (Still Air) Operating (Still Air) –2– unless otherwise noted AD8108/AD8109 Typ Max Units 325/250 MHz 140/160 MHz 5 ns 400/480 ...
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... Figure 1. Timing Diagram, Serial Mode Table I. Logic Levels RESET, SER/PAR CLK, DATA IN, CE, UPDATE DATA OUT DATA OUT 2.7 V min 0.5 V max 20 A max –3– AD8108/AD8109 Limit Min Typ Max 20 100 20 100 0 50 180 8 6.4 100 200 OUT00 (D0 ...
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... AD8108/AD8109 TIMING CHARACTERISTICS (Parallel) Parameter Data Setup Time CLK Pulsewidth Data Hold Time CLK Pulse Separation CLK to UPDATE Delay UPDATE Pulsewidth Propagation Delay, UPDATE to Switch On or Off CLK, UPDATE Rise and Fall Times RESET Time 1 CLK 0 1 D0–D3 A0– LATCHED ...
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... ABSOLUTE MAXIMUM RATINGS Supply Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12 Internal Power Dissipation AD8108/AD8109 80-Lead Plastic TQFP (ST 2.6 W Input Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . V Output Short Circuit Duration . . . . . . . . . . . . . . . . . . . . . . Observe Power Derating Curves Storage Temperature Range . . . . . . . . . . . . – +125 C Lead Temperature Range (Soldering 10 sec +300 C NOTES 1 Stresses above those listed under Absolute Maximum Ratings may cause perma- nent damage to the device. This is a stress rating only ...
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... AD8108/AD8109 CE UPDATE CLK DATA Data D3 PARALLEL DATA D2 (OUTPUT ENABLE) D3 SER/PAR DATA (SERIAL) CLK CLK CLK CE UPDATE OUT0 EN OUT1 EN OUT2 EN A0 OUT3 EN A1 ...
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... Parallel Data Input, TTL Compatible (Input Select). Parallel Data Input, TTL Compatible (Input Select MSB). Parallel Data Input, TTL Compatible (Output Enable). Not Connected ESD OUTPUT 1k ESD (AD8109 ONLY) AVEE b. Analog Output V CC ESD ESD DGND d. Logic Input Figure 5. I/O Schematics – ...
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... AGND 9 IN04 10 AGND 11 IN05 12 AGND 13 IN06 AGND 14 15 IN07 16 AGND 17 AVEE 18 AVCC 19 AVCC07 20 OUT07 CONNECT PIN CONFIGURATION PIN 1 IDENTIFIER AD8108/AD8109 TOP VIEW (Not to Scale) –8– DATA OUT 58 CLK 57 DATA IN 56 UPDATE 55 SER/PAR ...
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... REV. 0 0.4 0.3 0.2 0.1 0 200mV p-p –0.1 –0.2 –0.3 –0.4 100M 1G Figure 9. AD8108 Step Response, 100 mV Step 100 200 Figure 10. AD8108 Step Response Step 3RD HARMONIC 10M 100M –9– AD8108/AD8109 +50mV +25mV 0 –25mV –50mV 10ns/DIV +1.0V +0.5V 0 –0.5V –1.0V 10ns/DIV 2V STEP R = 150 L 0.2 0.1 0 –0.1 – ...
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... Figure 14. AD8109 Distortion vs. Frequency 0.4 0.3 0.2 0.1 200mV p-p 0 –0.1 –0.2 –0.3 –0.4 100M 1G Figure 15. AD8109 Step Response, 100 mV Step ALL HOSTILE 100M 200M Figure 16. AD8109 Step Response Step 3RD HARMONIC 10M 100M –10– +50mV +25mV 0 –25mV –50mV 10ns/DIV +1.0V +0.5V 0 –0.5V –1.0V 10ns/DIV 2V STEP RTO ...
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... Figure 22. AD8108 Off Isolation, Input-Output 1k 100 10 1 0.1 100 500 100k Figure 23. AD8108 Output Impedance, Enabled –11– AD8108/AD8109 5 SWITCHING BETWEEN TWO INPUTS 4 3 UPDATE INPUT TYPICAL VIDEO OUT (RTO) 0 –10 50ns/DIV p ...
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... FREQUENCY – Hz Figure 24. AD8109 PSRR vs. Frequency 100 56.3 31.6 17.8 10 5.63 3.16 10 100 1k 10k FREQUENCY – Hz Figure 25. AD8109 Voltage Noise vs. Frequency 100k 10k 1k 100 1 100k 1M 10M FREQUENCY – Hz Figure 26. AD8109 Output Impedance, Disabled 1M 10M Figure 27. AD8109 Switching Transient (Glitch) –40 –50 –60 – ...
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... Figure 34. AD8108 Offset Voltage Distribution 2.0 1.5 1.0 0.5 0.0 –0.5 –1.0 –1.5 –2.0 100M 1G 3G –60 Figure 35. AD8108 Offset Voltage Drift vs. Temperature (Normalized at +25 C) –13– AD8108/AD8109 V OUT 1 0 INPUT 1 AT +1V –1 INPUT 0 AT –1V 5 UPDATE 0 50ns/DIV Figure 33. AD8108 Switching Time –0.010 0.000 0.010 OFFSET VOLTAGE – Volts – ...
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... FREQUENCY – Hz Figure 36. AD8109 Input Impedance vs. Frequency V = 100mV 150 –2 –4 –6 –8 30k 100k 1M 10M FREQUENCY – Hz Figure 37. AD8109 Frequency Response vs. Capacitive Load V = 100mV IN 0 150 L 0 18pF L 0.2 0 12pF L –0.1 –0.2 –0.3 –0.4 30k 100k ...
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... THEORY OF OPERATION: The AD8108 (G = +1) and AD8109 (G = +2) share a common core architecture consisting of an array of 64 transconductance (gm) input stages organized as eight 8:1 multiplexers with a common, 8-line analog input bus. Each multiplexer is basically a folded-cascode high impedance voltage feedback amplifier with eight input stages. The input stages are NPN differential ...
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... For devices that will be used to drive a terminated cable with its outputs, the AD8109 can be used. This device has a built-in gain of two that eliminates the need for a gain-of-two buffer to drive a video line. Because of the presence of the feedback net- work in these devices, the disabled output impedance is about 1 k ...
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... The excellent video specifications of the AD8108/AD8109 make them ideal candidates for creating composite video crosspoint 8 8 switches. These can be made quite dense by taking advantage 8 of the AD8108/AD8109’s high level of integration and the fact R 8 TERM that composite video requires only one crosspoint channel per system video channel. There are, however, other video formats OUT 16– ...
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... Areas of Crosstalk For a practical AD8108/AD8109 circuit required that it be mounted to some sort of circuit board in order to connect it to power supplies and measurement equipment. Great care has been taken to create a characterization board (also available as an evaluation board) that adds minimum crosstalk to the intrin- sic device. This, however, raises the issue that a system’ ...
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... As a crosspoint system or device grows larger, the number of theoretical crosstalk combinations and permutations can be- come extremely large. For example, in the case of the 8 8 matrix of the AD8108/AD8109, we can examine the number of crosstalk terms that can be considered for a single channel, say IN00 input. IN00 is programmed to connect to one of the AD8108/AD8109 outputs where the measurement can be made ...
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... The areas that must be carefully detailed are grounding, shielding, signal routing and supply bypassing. The packaging of the AD8108/AD8109 is designed to help keep the crosstalk to a minimum. Each input is separated from each other input by an analog ground pin. All of these AGNDs should be directly connected to the ground plane of the circuit board ...
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... DGND DVCC DVCC AVCC 1 INPUT 00 2 AGND 3 INPUT 01 4 AGND 5 INPUT 02 6 AGND 7 INPUT 03 8 AGND AD8108 OR AD8109 9 INPUT 04 10 AGND 11 INPUT 05 12 AGND 13 INPUT 06 14 AGND 15 INPUT 07 16 AGND 59 DATA OUT 57 DATA Figure 46. Evaluation Board Schematic – ...
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... AD8108/AD8109 Figure 47. Component Side Silkscreen Figure 48. Board Layout (Component Side) –22– REV. 0 ...
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... REV. 0 Figure 49. Board Layout (Signal Layer) Figure 50. Board Layout (Power Plane) –23– AD8108/AD8109 ...
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... AD8108/AD8109 Optimized for video applications, all signal inputs and outputs are terminated with 75 resistors. Stripline techniques are used to achieve a characteristic impedance on the signal input and output lines also Figure 52 shows a cross-section of one of the input or output tracks along with the arrangement of the PCB layers ...
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... CLK line on the evaluation board to ground. A pad has been provided on the solder-side of the evaluation board to allow this capacitor to be soldered into place. Depending upon the overshoot from the printer port, this capacitor may need large as 0.01 F. AD8108/AD8109 Figure 54. Evaluation Board Control Panel –25– AD8108/AD8109 ...
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... AD8108/AD8109 OUTLINE DIMENSIONS Dimensions shown in inches and (mm). 80-Lead Plastic TQFP (ST-80A) 0.559 (14.20) 0.543 (13.80) 0.063 (1.60) MAX 0.476 (12.10) 0.469 (11.90) 0.030 (0.75) 80 0.020 (0.50) 1 SEATING PLANE TOP VIEW (PINS DOWN) 0.003 (0.08) 20 MAX 21 0.006 (0.15) 0.002 (0.05) 0.020 (0.50) 0.011 (0.27) BSC 0.007 (0.17) 0.057 (1.45) 0.053 (1.35) –26– REV. 0 ...
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