AD7734 4-Channel, ±10 V Input Range, High Throughput, 24-Bit Sigma-Delta A/D Converter

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 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 AD7734 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.

Applications

PLCs/DCS
Multiplexing applications
Process control
Industrial instrumentation

Features and Benefits

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
See data sheet for additional features

Analog to Digital Converters

A/D Converters

Software & Systems Requirements

AD7732/4/8/9 Evaluation Software .ZIP

Data Sheets

Document	note
AD7734: 4-Channel, ±10 V Input Range, High Throughput, 24-Bit Sigma Delta ADC Data Sheet (Rev. B)	PDF 1542 kB

Application Notes

Document	note
AN-202: An IC Amplifier User’s Guide to Decoupling, Grounding, and Making Things Go Right for a Change (Rev. B)	PDF 76.97 K
AN-389: Using Sigma-Delta Converters-Part 2	PDF 590 kB
AN-388: Using Sigma-Delta Converters-Part 1	PDF 590 kB
AN-311: How to Reliably Protect CMOS Circuits Against Power Supply Overvoltaging	PDF 217 kB
AN-607: Selecting a Low Bandwidth (<15 kSPS) Sigma-Delta ADC (Rev. E)	PDF 222 kB
AN-615: Peak-to-Peak Resolution Versus Effective Resolution (Rev. 0)	PDF 70 kB
AN-397: Electrically Induced Damage to Standard Linear Integrated Circuits:	PDF 149 kB
AN-283: Sigma-Delta ADCs and DACs	PDF 1699 kB
AN-663: AD7732/AD7734/AD7738/AD7739 Calibration Registers (Rev. 0)	PDF 96 kB
AN-664: AD7732/AD7734/AD7738/AD7739 in Low Power Applications (Rev. 0)	PDF 131 kB
AN-626: Using the AD7732/AD7734/AD7738/AD7739 Checksum Register (Rev. 0)	PDF 106 kB

Order Information

Part Number	Package	Packing Qty	Temp Range	Price 100-499	Price 1000+	RoHS
AD7734BRU Production	28 ld TSSOP (4.4mm)	OTH 50	-40 to 105C	13.75	11.54	N
AD7734BRUZ Production	28 ld TSSOP (4.4mm)	OTH 50	-40 to 105C	12.5	10.49	Y
AD7734BRUZ-REEL7 Production	28 ld TSSOP (4.4mm)	REEL 1000	-40 to 105C	0	10.49	Y