The document describes the features and characteristics of the AD7868 LC2MOS complete 12-bit analog I/O system, including a 12-bit ADC and 12-bit DAC. It has a throughput rate of 83 kHz and a signal-to-noise ratio of 72 dB. The system can be used in various applications such as digital signal processing, speech recognition and synthesis, spectrum analysis, high-speed modems, and DSP servo control.
The AD7868 is a complete 12-bit I/O system containing a 12-bit successive approximation ADC with a track-and-hold amplifier and a 12-bit DAC with an output buffer amplifier. The device includes separate on-chip temperature-compensated 3V voltage references for both the ADC and DAC to ensure precision.
Interfacing is simplified through serial interfaces for both converters, minimizing pin count and allowing connection to most DSP machines via standard control signals like CONVST and LDAC. The part operates from ±5 V power supplies with an analog input/output range of ±3 V.
| Resolution | 12 Bits |
|---|---|
| Throughput Rate | 83 kHz |
| Settling Time | 3 µs |
| Signal-to-Noise Ratio | 70 dB min |
| Total Harmonic Distortion | -78 dB max |
| Input Voltage Range | ±3 V |
| Power Supply | ±5 V |
The DAC has an output buffer amplifier with a settling time of 3 µs to 12 bits.
Yes, it includes temperature compensated 3 V buried Zener references for both the DAC and ADC.