AD7738BRUZ-REEL7

The AD7738 is a high precision, high throughput analog front end. True 16-bit p-p resolution is achievable with a total conversion time of 117 μs (8.5 kHz channel switching), making it ideally suitable for high resolution multiplexing applications. The part can be configured via a simple digital interface, which allows users to balance the noise performance against data throughput up to a 15.4 kHz. The analog front end features eight single-ended or four fully differential input channels with unipolar or bipolar 625 mV, 1.25 V, and 2.5 V input ranges and accepts a common-mode input voltage from 200 mV above AGND to AVDD - 300 mV. The multiplexer output is pinned out externally, allowing the user to implement programmable gain or signal conditioning before applying the input to the ADC. The differential reference input features “No-Reference” detect capability. The ADC also supports per channel system calibration options. The digital serial interface can be configured for 3-wire operation and is compatible with microcontrollers and digital signal processors. All interface inputs are Schmitt triggered. The part is specified for operation over the extended industrial temperature range of -40℃ to +105℃.

Applications

• PLCs/DCS
• Multiplexing Applications
• Process Control
• Industrial Instrumentation

Key features

• High Resolution ADC 24 Bits No Missing Codes ±0.0015% Nonlinearity
• Optimized for Fast Channel Switching 18-Bits p-p Resolution (21 Bits Effective) at 500 Hz 16-Bits p-p Resolution (19 Bits Effective) at 8.5 kHz 15-Bits p-p Resolution (18 Bits Effective) at 15 kHz On-Chip Per Channel System Calibration
• Configurable Inputs 8 Single-Ended or 4 Fully Differential
• Input Ranges +625 mV, +1.25 V, +2.5 V, ±625 mV, ±1.25 V, ±2.5 V
• 3-Wire Serial Interface SPI, QSPI, MICROWIRE and DSP Compatible Schmitt Trigger on Logic Inputs
• Single-Supply Operation 5 V Analog Supply 3 V or 5 V Digital Supply
• Package: 28-Lead TSSOP