Analog Devices Inc. AD7888BR-REEL7

Overview

AD7888BR-REEL7 from Analog Devices is a micropower, 12-bit, 8-channel successive-approximation ADC operating from a single 2.7 V to 5.25 V supply, delivering 125 kSPS throughput with 500 ns track/hold acquisition time and integrated 2.5 V reference. It supports SPI/QSPI/MICROWIRE/DSP-compatible serial interface and targets battery-powered instrumentation requiring low power and high channel density in compact TSSOP-16 packaging.

For engineers reviewing the AD7888BR-REEL7 datasheet, AD7888BR-REEL7 pinout, AD7888BR-REEL7 application, or AD7888BR-REEL7 equivalent, key selection considerations include its 12-bit resolution with ±1 LSB DNL (B-grade), 71 dB SNR at 10 kHz, flexible power management (shutdown current ≤1 µA at 2.7–3.6 V), 0–V_REF single-ended input range, and TSSOP-16 package compatibility with space-constrained portable designs.

Technical Context

The AD7888BR-REEL7 implements a charge redistribution SAR architecture with on-chip track-and-hold, 8:1 analog multiplexer, and internal 2.5 V reference buffer accessible via REF IN/REF OUT. Its conversion timing is fully synchronous to SCLK, requiring 16 clock cycles per conversion (14.5 for conversion + 1.5 for acquisition) at up to 2 MHz.

It features three programmable power modes-Normal, Autoshutdown, and Autostandby-controlled by PM1/PM0 bits in an 8-bit write-only control register. Channel selection (AIN1–AIN8) is set via ADD2–ADD0 bits, while the REF bit enables or disables the internal reference when using external 1.2 V–V_DD references.

Key Specifications

Pinout & Package

AD7888BR-REEL7 is housed in a 16-lead thin shrink small outline package (TSSOP), measuring 5.0 mm × 4.4 mm × 1.2 mm, with 0.65 mm lead pitch and exposed pad not connected internally. The package is RoHS-compliant and rated for operation from –40°C to +105°C.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 12-bit, 8-channel, serial-interface ADC applications.

Compared with ADS7822U and MAX11131ETE+, the AD7888BR-REEL7 uniquely balances 8-channel count, internal 2.5 V reference, multi-protocol serial compatibility, and 2.7–5.25 V operation - making it optimal for mixed-voltage portable instrumentation where board space, power, and design reuse are constrained.

Availability

AD7888BR-REEL7 is available at Aetrix Electronics and suitable for battery-powered medical devices, industrial data loggers, and high-speed modem front ends requiring stable component supply across extended production lifecycles.

Supply support for AD7888BR-REEL7 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, serving precision instrumentation, industrial automation, communications, and healthcare markets.

The AD7888BR-REEL7 belongs to Analog Devices' micropower SAR ADC product line, engineered specifically for space- and energy-constrained portable measurement systems requiring high channel density without sacrificing DC accuracy or dynamic performance.

FAQ

What is the guaranteed differential nonlinearity (DNL) specification for AD7888BR-REEL7?

The AD7888BR-REEL7 is the B-grade version of the AD7888, with guaranteed differential nonlinearity of –1/+1.5 LSB maximum across the full operating temperature range (–40°C to +105°C). This ensures monotonic behavior and no missing codes over all 12 bits, which is essential for closed-loop control and precision measurement applications where code transitions must be strictly ordered.

Does AD7888BR-REEL7 support external reference voltages, and what is the acceptable range?

Yes, AD7888BR-REEL7 supports external reference voltages applied to the REF IN/REF OUT pin. The valid range is 1.2 V to V_DD, and the internal 2.5 V reference must be disabled via the REF bit in the control register to use an external source. Input impedance rises to >1 GΩ when the internal reference is disabled, minimizing loading effects on precision external references.

How does the power management of AD7888BR-REEL7 reduce system-level power consumption?

AD7888BR-REEL7 offers four programmable power modes via PM1/PM0 bits: Normal (700 µA), Autostandby (450 µA at 50 kSPS), Autoshutdown (12 µA at 1 kSPS), and Full Shutdown (1 µA at 2.7–3.6 V). In Autoshutdown mode, the device powers down automatically after each conversion and wakes in 5 µs - enabling microcontroller-governed burst sampling with near-zero quiescent current between acquisitions.

What serial interface protocols is AD7888BR-REEL7 compatible with, and how is timing managed?

AD7888BR-REEL7 is hardware-compatible with SPI, QSPI, MICROWIRE, and DSP serial protocols. Timing is master-controlled by the SCLK input, with CS active-low framing; DIN data is latched on rising edges, and DOUT data is valid on falling edges. A full 16-clock cycle transfers both control register data (first 8 clocks) and conversion result (next 8 clocks), ensuring deterministic, glitch-free communication.

Can AD7888BR-REEL7 operate from a 3 V supply, and what performance trade-offs apply?

Yes, AD7888BR-REEL7 operates from 2.7 V to 3.6 V (3 V nominal) with fully specified performance: 125 kSPS throughput, 71 dB SNR, ±6 LSB offset error max, and 1 µA shutdown current. At 3 V, normal-mode power dissipation drops to 2.1 mW, and the input high voltage threshold lowers to 2.1 V - ensuring reliable interfacing with 3 V microcontrollers without level shifters.