The device 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 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.
Other devices in the AD7734BRU family are the AD7732 and the AD7738.
The AD7732 is similar to AD7734, but its analog front end features two fully differential 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.
High resolution analog-to-digital converter (ADC)24 bits no missing codes±0.0025% nonlinearity
Optimized for fast channel switching18-bit p-p resolution (21 bits effective) at 500 Hz16-bit p-p resolution (19 bits effective) at 2 kHz14-bit p-p resolution (18 bits effective) at 15 kHzOn-chip per channel system calibration
4 single-ended analog inputsInput ranges +5 V, ±5 V, +10 V, ±10 VOvervoltage tolerantUp to ±16.5 V not affecting adjacent channelUp to ±50 V absolute maximum
See data sheet for additional features
PLCs/DCS
Multiplexing applications
Process control
Industrial instrumentation
(Picture: Diagram)
Number of Channels
4
Architecture
Sigma-Delta
Conversion Rate
15.4 kSPs
Resolution
24 bit
Input Type
Single-Ended
Interface Type
Serial (3-Wire, SPI, QSPI, Microwire)
Operating Supply Voltage
5 V
Maximum Operating Temperature
+ 105 C
Mounting Style
SMD/SMT
Package / Case
TSSOP-28
Maximum Power Dissipation
100 mW
Minimum Operating Temperature
- 40 C
Number of Converters
1
Packaging
Tube
Series
AD7734
Factory Pack Quantity
50
Voltage Reference
External
ModelsDescriptionOperation
AD7731BRUZPrecision A/D Converters ; Multiplexed A/D Converters, AD, TSSOP-24Compare
AD7732BRUZPrecision A/D Converters ; Multiplexed A/D Converters, AD, TSSOP-28Compare
AD7731BRAnalog / Digital & Digital / Analog Converter, AD, SOIC-24Compare
AD7731BRZData Acquisition - Analog to Digital Converters, AD, SOIC24Compare
AD7724ASTZPrecision A/D Converters ; Multiplexed A/D Converters, AD, LQFP-48Compare
AD7730BRUAnalog to Digital Converters - ADC, AD, 24 ld TSSOPCompare