AD7783BRU-REEL

Overview

The AD7783BRU-REEL is a read-only, pin-configured 24-bit sigma-delta analog-to-digital converter (ADC) from Analog Devices. It features a single fully differential input channel with programmable gain of 1 or 16, enabling full-scale ranges of ±2.56 V or ±160 mV. The device integrates two 200 mA excitation current sources and operates at a fixed update rate of 19.79 Hz, providing simultaneous 50 Hz and 60 Hz rejection. It supports both master and slave serial interface modes using SCLK, CS, and DOUT/RDY signals. Power consumption is specified as 1.3 mA in normal mode and 9 μA in power-down mode at 3 V. The component operates within a supply voltage range of 2.7 V to 3.6 V or 4.75 V to 5.25 V and is housed in a 16-lead TSSOP package.

Feature Summary

• Pin-configurable input ranges without programmable registers
• Integrated dual excitation current sources for sensor biasing
• Fixed update rate with simultaneous line frequency rejection
• Read-only digital interface supporting master and slave operations

Applications

• Sensor measurement systems
• Industrial process control
• Temperature measurement
• Pressure measurement
• Weigh scales
• Portable instrumentation

Procurement Notes

Verify the specific ordering suffix against the manufacturer's official documentation to confirm packaging type and compliance status. The REEL designation indicates tape-and-reel packaging suitable for automated assembly. Confirm that the component meets all required environmental specifications for the intended operating temperature range before integration into final designs.

Selection Notes

Select this component when a high-resolution, low-frequency ADC with integrated signal conditioning and excitation capabilities is required. The fixed update rate simplifies filter design by eliminating aliasing concerns at power line frequencies. Ensure the application can accommodate the 32.768 kHz crystal requirement and the specific input common-mode voltage limits defined in the datasheet.

Part Context

The AD7783 belongs to the AD778x family of precision data converters. It is functionally similar to the AD7782 but includes integrated excitation current sources and offers a single-channel configuration instead of two. This distinction makes it particularly suitable for applications requiring direct sensor excitation without external circuitry.

Replacement Considerations

The AD7782 serves as a related alternative within the same family, offering two differential channels but lacking the integrated current sources. Verify pin compatibility and functional differences regarding channel count and excitation capabilities when considering substitutes.

FAQ

How is the input range configured on the AD7783?

The input range is configured via the RANGE logic pin. Setting RANGE to 0 selects the ±160 mV range, while setting it to 1 selects the ±2.56 V range, assuming a 2.5 V reference.

What is the purpose of the IPIN pin?

The IPIN pin selects the routing of the internal excitation current sources. When tied to GND, IEXC1 routes to IOUT1; when tied to VDD, IEXC1 routes to IOUT2.

Can the AD7783 operate without an external microcontroller?

Yes, in master mode, the AD7783 generates its own SCLK signal, allowing it to drive data output independently without an external clock source.