AD7868

V_DD to AGND . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.3 V to +7 V
V_SS to AGND . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +0.3 V to 7 V
AGND to DGND . . . . . . . . . . . . . . . . . . . . . . 0.3 V to V_DD +0.3 V
V_OUT to AGND . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . V_SS to V_DD
V_IN to AGND . . . . . . . . . . . . . . . .  . . . .V_SS 0.3 V to V_DD + 0.3 V
RO ADC to AGND . . . . . . . . . . . . . . .  . . . . 0.3 V to V_DD + 0.3 V
RO DAC to AGND . . . . . . . . . . . . . . . . . . .  0.3 V to V_DD + 0.3 V
RI DAC to AGND . . . . . . . . . . . . . . . . . . . . 0.3 V to V_DD + 0.3 V
Digital Inputs to AGND . . . . . . . . . . . . . . . 0.3 V to V_DD + 0.3 V
Digital Outputs to AGND . . . . . . . . . . . . .  0.3 V to V_DD + 0.3 V
Operating Temperature Range
A, B Versions . . . . . . . . . . . . . . . . . . . . . . . . . 40°C to +85°C
T Version . . . . . . . . . . . . . . . . . . . . . . . . . . . 55°C to +125°C
Storage Temperature Range . . . . . . . . . . . . 65°C to +150°C
Lead Temperature (Soldering, 10 secs) . . . . . . . . . . . .  +300°C
Power Dissipation (Any Package) to +75°C . . . . . . . . .  450 mW
Derates above +75°C by . . . . . . . . . . . . . . . . . . . .  .10 mW/°C
*Stresses above those listed under "Absolute Maximum Ratings" may cause ermanent damage to the device. This is a stress rating only and functional peration of the device at these or any other conditions above those listed in the perational sections of this specification is not implied. Exposure to absolute aximum rating conditions for extended periods may affect device reliability.

The AD7868 is a complete 12-bit I/O system containing a DAC and an ADC . The ADC is a successive approximation type with a track-and-hold amplifier having a combined throughput rate of 83 kHz. The DAC has an output buffer amplifier with a settling time of 3 ms to 12 bits. Temperature compensated 3 V buried Zener references provide precision references for the DAC and ADC.

Interfacing to both the DAC and ADC is serial, minimizing pin count and giving a small 24-pin package size. Standard control signals allow serial interfacing to most DSP machines. Asynchronous ADC conversion control and DAC updating is made possible with the CONVST and LDAC logic inputs.

The AD7868 operates from ±5 V power supplies, the analog input/ output range of the ADC/DAC is ±3 V. The part is fully specified for dynamic parameters such as signal-to-noise ratio and harmonic distortion as well as traditional dc specifications. The part is available in a 24-pin, 0.3" wide, plastic or hermetic dual-in-line package (DIP) and in a 28-pin, plastic SOIC package.