AD7628 Analog Devices, AD7628 Datasheet
AD7628
Specifications of AD7628
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AD7628 Summary of contents
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... TTL/CMOS compatible input port. Control in- put DAC A/DAC B determines which DAC loaded. The AD7628’s load cycle is similar to the write cycle of a ran- dom access memory, and the device is bus compatible with most 8-bit microprocessors, including 6502, 6809, 8085, Z80. ...
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... NOTES 1 Temperature Ranges are K Version; – + Version; – + Version; – +125 C. 2 Specification applies to both DACs in AD7628. 3 Guaranteed by design but not production tested. 4 Logic inputs are MOS Gates. Typical input current (+ less than 1 nA. ...
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... ESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000 V readily accumulate on the human body and test equipment and can discharge without detection. Although the AD7628 features proprietary ESD protection circuitry, permanent damage may occur on devices subjected to high energy electrostatic discharges. Therefore, proper ESD precautions are recommended to avoid performance degradation or loss of functionality ...
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... Figure 3). To minimize power sup- ply currents recommended that the digital input voltages be as close to the supply rails (V The AD7628 may be operated with any supply voltage in the range 10.8 Figure 3. Typical Plot of Supply Current, I Input Voltage V – ...
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... IN 256 NOTE: 1 LSB = (2 Table III. Recommended Trim Resistor Values Trim Resistor K/B/T R1; R3 500 R2; R4 150 –5– AD7628 Table II. Bipolar (Offset Binary) Code Table Analog Output (DAC A or DAC B) 127 V IN 128 128 0 1 –V ...
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... Figure 6. Channel-to-Channel Isolation Figure 7. Suggested PC Board Layout for AD7628 with AD644 Dual Op Amp Figure 7 shows a printed circuit layout for the AD7628 and the AD644 dual op amp, which minimizes feedthrough and crosstalk. SINGLE SUPPLY APPLICATIONS The AD7628 DAC R-2R ladder termination resistors are con- nected to AGND within the device ...
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... REV. A Figure 12. AD7628 Dual DAC to 8085 CPU Interface In the circuit of Figure 13, the AD7628 is used to implement a programmable window comparator. DACs A and B are loaded with the required upper and lower voltage limits for the test, respectively. If the test input is not within the programmed lim- its, the pass/fail output will indicate a fail (logic zero) ...
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... AD7628 DIGITALLY CONTROLLED DUAL TELEPHONE ATTENUATOR In this configuration, the AD7628 functions as a 2-channel digitally controlled attenuator; ideal for stereo audio and tele- phone signal level control applications. Table IV gives input codes vs. attenuation for 15.5 dB range. Attenuation, dB Input Code = 256 10 exp 20 Figure 15 ...