This datasheet details the AD7688, a 16-bit, 500 kSPS PulSAR differential ADC featuring no missing codes and a proprietary serial interface.
The AD7688 is a 16-bit, charge redistribution, successive approximation analog-to-digital converter (ADC) that operates from a single 5 V power supply. It features a proprietary serial interface compatible with SPI, QSPI, MICROWIRE, and DSP protocols, allowing for daisy-chaining multiple devices. The device includes an internal conversion clock and a low noise, wide bandwidth track-and-hold circuit.
| Resolution | 16 Bits |
|---|---|
| Throughput | 500 kSPS |
| Integral Linearity Error | ±1.5 LSB max |
| Dynamic Range | 96.5 dB |
| Signal-to-Noise Ratio | 95.5 dB at 20 kHz |
| Total Harmonic Distortion | −118 dB at 20 kHz |
| Analog Input Voltage Range | −VREF to +VREF |
| Operating Temperature Range | −40°C to +85°C |
| Power Dissipation | 21.5 mW at 500 kSPS |
The maximum conversion rate is 500 kSPS.
Yes, it supports daisy-chaining multiple ADCs on a single 3-wire bus using the SDI input.
The integral linearity error is ±0.4 LSB typical and ±1.5 LSB maximum.