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AD7738BRUZ-REEL7
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Product Detailed Parameters
- Description：IC ADC 24BIT SIGMA-DELTA 28TSSOP
- Series：-
- Mfr：Analog Devices Inc.
- Package：Tape & Reel (TR),Cut Tape (CT)
- Number of Bits：24
- Sampling Rate (Per Second)：15.4k
- Number of Inputs：4, 8
- Input Type：Differential, Single Ended
- Data Interface：SPI, DSP
- Configuration：MUX-ADC
- Ratio - S/H:ADC：-
- Number of A/D Converters：1
- Architecture：Sigma-Delta
- Reference Type：External
- Voltage - Supply, Analog：5V
- Voltage - Supply, Digital：2.7V ~ 3.6V, 5V
- Features：True Bipolar
- Operating Temperature：-40°C ~ 105°C
- Package / Case：28-TSSOP (0.173", 4.40mm Width)
- Supplier Device Package：28-TSSOP
- Mounting Type：Surface Mount
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Overview
The AD7738BRUZ-REEL7 is an 8-channel, high throughput, 24-bit sigma-delta analog-to-digital converter (ADC) manufactured by Analog Devices Inc. It operates with a single 5 V analog supply and supports digital supplies of either 3 V or 5 V. The device features eight single-ended or four fully differential input channels with configurable unipolar or bipolar input ranges of ±625 mV, ±1.25 V, and ±2.5 V. It achieves true 16-bit peak-to-peak resolution at channel switching rates up to 8.5 kHz and supports data throughput up to 15.4 kHz. The component utilizes a 3-wire serial interface compatible with SPI, QSPI, MICROWIRE, and DSP systems, housed in a 28-lead TSSOP package.
Feature Summary
- Configurable multiplexer output allows external implementation of programmable gain or signal conditioning before the ADC input.
- Differential reference input includes 'No-Reference' detect capability for system monitoring.
- Supports per-channel system calibration options to reduce offset and gain errors.
- All digital interface inputs are Schmitt triggered for noise immunity.
Applications
- PLCs/DCS
- Multiplexing Applications
- Process Control
- Industrial Instrumentation
Procurement Notes
Verify the specific ordering suffix REEL7 corresponds to tape and reel packaging when sourcing. Confirm that the BRUZ variant meets the required extended industrial temperature range specifications. Ensure compatibility with the intended serial communication protocol configuration before finalizing procurement.
Selection Notes
Select this component for applications requiring high-resolution multiplexing with fast channel switching speeds. Consider the AD7734 or AD7732 if fewer channels or different input voltage ranges are sufficient for the design requirements. Evaluate power consumption trade-offs between chopping enabled and disabled modes based on noise performance needs.
Part Context
The AD7738 belongs to the AD7738 family of high-precision analog front ends. Related parts include the AD7734, which features four single-ended input channels with ±10 V ranges, and the AD7732, which provides two fully differential input channels. These variants share similar architectural characteristics but differ in channel count and input capabilities.
Replacement Considerations
Public confirmed substitute part numbers: AD7734BRUZ, AD7732BRUZ.
FAQ
What is the common-mode input voltage range for the AD7738?
The AD7738 accepts a common-mode input voltage from 200 mV above AGND to AVDD minus 300 mV.
How does the AD7738 handle reference voltage detection?
The differential reference input features a 'No-Reference' detect capability, indicated by the NOREF bit in the Channel Status Register.
Can the multiplexer output be used externally?
Yes, the multiplexer output is pinned out externally as MUXOUT(+) and MUXOUT(-), allowing users to implement programmable gain or signal conditioning.
