Analog Devices Inc. AD7893BR-5REEL7

Overview

AD7893BR-5REEL7 from Analog Devices is a 12-bit, serial-output analog-to-digital converter (ADC) with 6 µs conversion time, single +5 V supply operation, and integrated track/hold amplifier. It supports 0 V to +5 V unipolar input range, delivers straight binary output coding, and achieves 72 dB SNR at 10 kHz input - used in precision data acquisition systems for industrial sensor interfacing.

For engineers reviewing the AD7893BR-5REEL7 datasheet, AD7893BR-5REEL7 pinout, AD7893BR-5REEL7 application, or AD7893BR-5REEL7 equivalent, key selection criteria include its 8-pin SOIC package, 1.5 µs track/hold acquisition time, ±1/2 LSB relative accuracy, 25 mW typical power dissipation, and compatibility with microcontroller serial interfaces requiring minimal board space.

Technical Context

The AD7893BR-5REEL7 implements a successive-approximation ADC core with an on-chip R-2R ladder DAC and laser-trimmed internal clock oscillator. Its analog front-end includes a buffered reference input (2.375 V to 2.625 V), 9 kΩ input resistance, and high-impedance track/hold stage optimized for full-scale sine wave inputs up to 58 kHz.

Control is edge-triggered via CONVST: rising edge initiates hold mode and conversion; falling edge resets the serial shift register. Serial interface uses two-wire SCLK/SDATA timing - data valid on SCLK falling edge, 16-bit frame (4 leading zeros + 12-bit result), with SDATA three-stated after 16th falling edge.

Key Specifications

Pinout & Package

AD7893BR-5REEL7 is housed in an 8-pin small outline IC (SOIC) package with 1.27 mm pitch, JEDEC MS-012AC compliant, and RoHS-compliant lead finish.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 12-bit serial ADC applications.

Compared with AD7893AR-5 and ADS7822U, AD7893BR-5REEL7 offers the best balance of integrated functionality (track/hold + reference buffer), SOIC packaging for volume production, and guaranteed 72 dB SNR - making it optimal for space-constrained industrial DAQ where design-in simplicity and thermal performance matter.

Availability

AD7893BR-5REEL7 is available at Aetrix Electronics and suitable for industrial process monitoring, portable data loggers, test & measurement front ends, and motor control feedback systems requiring stable component supply across long product lifecycles.

Supply support for AD7893BR-5REEL7 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Analog Devices is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, founded in 1965 and headquartered in Wilmington, MA.

The AD7893BR-5REEL7 belongs to the LC²MOS precision ADC product line, designed specifically for space-constrained, low-power, single-supply data acquisition systems requiring integrated signal conditioning and deterministic timing.

FAQ

What is the maximum sampling rate achievable with AD7893BR-5REEL7 while maintaining full datasheet specifications?

The AD7893BR-5REEL7 achieves a maximum throughput rate of 117 kHz when operated with proper timing: 6 µs conversion time, 1.92 µs serial read (16 clocks at 8.33 MHz), and 600 ns minimum gap before next CONVST rising edge. This timing ensures compliance with all DC accuracy, SNR, and THD specifications. Higher rates (up to 133 kHz) are possible but incur ~1.5 dB SNR degradation and increased code flicker.

Does AD7893BR-5REEL7 require an external reference voltage, and what are the acceptable specifications?

Yes, AD7893BR-5REEL7 requires an external +2.5 V reference applied to the REF IN pin. The specified input range is 2.375 V to 2.625 V (±5%), with maximum input current of 10 µA and input capacitance ≤10 pF. Precision references such as the AD780 or AD680 are recommended to maintain full-scale error ≤±1.5 LSB and avoid gain-related inaccuracies.

How does the CONVST pin function in AD7893BR-5REEL7, and what timing constraints apply?

The CONVST pin is edge-triggered: its rising edge initiates track-to-hold transition and starts conversion, while its falling edge resets the internal serial output shift register. To ensure valid data, the read operation must complete at least 600 ns before the next CONVST rising edge. Software delays or hardware interrupt schemes synchronized to CONVST edges are commonly used to meet this requirement in microcontroller-based systems.

What is the output data format of AD7893BR-5REEL7, and how is it serialized?

AD7893BR-5REEL7 outputs 12-bit straight binary data for its 0 V to +5 V input range. Serial transmission uses a 16-bit frame: four leading zeros followed by the 12-bit result (MSB first, DB11 to DB0). Data is clocked out on the rising edge of SCLK and valid on the falling edge. After the 16th falling SCLK edge, SDATA enters high-impedance (three-state) mode.

Can AD7893BR-5REEL7 be used with bipolar input signals, and what are the alternatives if needed?

No, AD7893BR-5REEL7 is configured for unipolar 0 V to +5 V input only. For bipolar operation, select AD7893BR-10 (±10 V) or AD7893BR-3 (±2.5 V), which use two's complement coding and different internal resistor networks. These variants share identical pinout, timing, and SOIC packaging but differ in input structure, reference sensitivity, and full-scale error specification.