The AD7732 is a high precision, high throughput analog front end. True 16-bit peak-to-peak resolution is achievable with total conversion times of 500 µs (2 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 two fully differential input channels with unipolar or true bipolar input ranges to ±10 V while operating from a single +5 V analog supply. The part has an overrange and underrange detection capability and accepts an analog input overvoltage to ±16.5 V without degrading the performance of the adjacent channels.
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 –40ºC to +105ºC and is available in 28-lead TSSOP package.
Other parts in the AD7732 family are the AD7734 and the AD7738.
The AD7734 is similar to AD7732, but its analog front end features four single-ended input channels.
The AD7738 analog front end is configurable for four fully differential or eight single-ended input channels, features 0.625 V to 2.5 V bipolar/unipolar input ranges, and accepts a common-mode input voltage from 200 mV to AVDD – 300 mV. The AD7738 multiplexer output is pinned out externally, allowing the user to implement programmable gain or signal conditioning before being applied to the ADC.
**Applications**
PLCs/DCS
Multiplexing applications
Process control
Industrial instrumentation
### Features and Benefits
High resolution ADC
\- 24 bits no missing codes
\- ±0.0015% nonlinearity
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
Optimized for fast channel switching
\- 18-bit p-p resolution (21 bits effective) at 500 Hz
\- 16-bit p-p resolution (19 bits effective) at 2 kHz
\- 14-bit p-p resolution (18 bits effective) at 15 kHz
