AD7734BRUZ

The AD7734 is a high precision, high throughput analog front end. True 16-bit p-p resolution is achievable with a total conversion time of 500 μs (2 kHz channel switching), making it ideally suitable for high resolution multiplexing applications. The device can be configured via a simple digital interface, which allows users to balance the noise performance against data throughput up to 15.4 kHz. The analog front end features four single-ended input channels with unipolar or true bipolar input ranges to ±10 V while operating from a single +5 V analog supply. The device 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 device is specified for operation over the extended industrial temperature range of -40°C to +105°C.

Applications

• PLCs/DCS
• Multiplexing applications
• Process control
• Industrial instrumentation

Key features

• High resolution analog-to-digital converter (ADC) 24 bits no missing codes ±0.0025% nonlinearity
• 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
• On-chip per channel system calibration
• 4 single-ended analog inputs
• Input ranges +5 V, ±5 V, +10 V, ±10 V
• Overvoltage tolerant Up to ±16.5 V not affecting adjacent channel Up to ±50 V absolute maximum
• 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