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AD7739: 8-Channel,High Throughput, 24-Bit Sigma-Delta ADC Data Sheet (Rev. A)9/28/2006PDF380 kB
Alternative Parts
Overview
Features and Benefits
- 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 4 kHz
On-Chip Per Channel System Calibration - Configurable Inputs 8 Single-Ended or 4 Fully Differential
- Package: 24-Lead TSSOP
- Input Ranges
+625 mV, ±625 mV, +1.25 V, ±1.25 V, +2.5 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
Product Details
The AD7739 is a high precision, high throughput analog front end. True 16-bit p-p resolution is achievable with a total conversion time of 250 μs (4 kHz channel switching), making it ideally suited to 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 15 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. It accepts a common-mode input voltage from 200 mV above AGND to AVDD − 300 mV.
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°C to +105°C.
Other parts in the AD7739 family are the AD7738, AD7734, and AD7732.
The AD7738 is similar to the AD7739 but has higher speed (8.5 kHz channel switching for 16-bit performance) and higher AIN leakage current. The AD7738 multiplexer output is pinned out externally, allowing the user to implement programmable gain or signal conditioning before being applied to the ADC.
The AD7734 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 AD7734 accepts an analog input overvoltage to ±16.5 V without degrading the performance of the adjacent channels.
The AD7732 is similar to the AD7734, but its analog front end features two fully differential input channels.
APPLICATIONS
- PLCs/DCSs
- Multiplexing applications
- Process control
- Industrial instrumentation
Product Categories
Product Lifecycle
Production
At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.
Evaluation Kits (1)
Documentation & Resources
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AN-607: Selecting a Low Bandwidth (<15 kSPS) Sigma-Delta ADC (Rev. E)10/12/2006PDF222 kB
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AN-663: AD7732/AD7734/AD7738/AD7739 Calibration Registers (Rev. 0)1/1/2000PDF96 kB
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AN-664: AD7732/AD7734/AD7738/AD7739 in Low Power Applications (Rev. 0)1/1/2000PDF131 kB
Software & Systems Requirements
Evaluation Software
Tools & Simulations
Design Tools
Sigma-Delta ADC Tutorial
An interactive illustration showing the behavior of an idealized sigma-delta A/D converter.
Design Resources
ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal.
PCN-PDN Information
Sample & Buy
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Evaluation Boards
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Pricing displayed is based on 1-piece. The USA list pricing shown is for budgetary use only, shown in United States dollars (FOB USA per unit), and is subject to change. International prices may vary due to local duties, taxes, fees and exchange rates.