Analog Devices Inc. AD7888ARUZ-REEL7

Overview

AD7888ARUZ-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-and-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 packaging.

For engineers reviewing the AD7888ARUZ-REEL7 datasheet, AD7888ARUZ-REEL7 pinout, AD7888ARUZ-REEL7 application, or AD7888ARUZ-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 (1 µA shutdown current), 8 single-ended analog inputs (0–V_REF), and TSSOP-16 package compatibility with space-constrained portable medical and industrial data acquisition systems.

Technical Context

The AD7888ARUZ-REEL7 implements a charge redistribution SAR architecture with on-chip track-and-hold, enabling full-power signal conversion up to 2.5 MHz bandwidth. Its control logic manages multiplexer selection (ADD0–ADD2), reference enable/disable (REF bit), and three power modes (normal, autoshutdown, autostandby) via an 8-bit write-only register loaded on DIN during SCLK rising edges.

Serial communication uses a 16-clock cycle frame: first 8 clocks load the control register (MSB-first), while the last 8 clocks output conversion results as 4 leading zeros followed by 12-bit MSB-first straight binary data on DOUT synchronized to SCLK falling edges. REF IN/REF OUT serves dual function-providing internal 2.5 V reference or accepting external 1.2 V to V_DD reference with 5 kΩ input impedance when enabled.

Key Specifications

Pinout & Package

AD7888ARUZ-REEL7 is housed in a 16-lead thin shrink small outline package (TSSOP), 5.0 mm × 4.4 mm × 1.2 mm body size, with 0.65 mm lead pitch and exposed pad not connected internally. The package is RoHS-compliant and rated for –40°C to +105°C operation.

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 AD7888ARUZ-REEL7 uniquely combines internal 2.5 V reference, 1 µA shutdown current, SPI/QSPI/MICROWIRE compatibility, and full 2.7–5.25 V operation-making it optimal for battery-powered, multi-voltage, space-constrained instrumentation where reference stability and minimal external components are critical.

Availability

AD7888ARUZ-REEL7 is available at Aetrix Electronics and suitable for portable medical instrumentation, battery-powered data loggers, industrial sensor fusion nodes, and high-speed modem analog front ends requiring stable component supply across extended production lifecycles.

Supply support for AD7888ARUZ-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 AD7888ARUZ-REEL7 belongs to Analog Devices' micropower SAR ADC product line, designed specifically for space- and energy-constrained applications demanding high channel density, integrated reference, and robust serial interface compatibility without sacrificing DC accuracy or dynamic performance.

FAQ

What is the maximum sample rate supported by the AD7888ARUZ-REEL7?

The AD7888ARUZ-REEL7 supports a maximum throughput rate of 125 kSPS when operated with a 2 MHz SCLK across its full 2.7 V to 5.25 V supply range. This corresponds to a total conversion time plus acquisition time of 16 SCLK cycles (7.25 µs at 2 MHz). The device maintains this rate regardless of supply voltage, enabling consistent timing in mixed-voltage systems.

Does the AD7888ARUZ-REEL7 include an internal voltage reference?

Yes, the AD7888ARUZ-REEL7 integrates a precision 2.5 V on-chip reference with ±50 ppm/°C temperature coefficient, accessible via the REF IN/REF OUT pin. This reference can be enabled or disabled using the REF bit in the control register. When disabled, the same pin accepts external references from 1.2 V to V_DD, providing design flexibility without requiring external reference ICs in most applications.

How many analog input channels does the AD7888ARUZ-REEL7 support, and what is their configuration?

The AD7888ARUZ-REEL7 supports eight single-ended analog input channels (AIN1 through AIN8), each with a 0 V to V_REF input range. Channel selection is controlled by the ADD0–ADD2 bits in the 8-bit control register. Unused channels must be tied to AGND to prevent noise coupling, and the default channel on power-up is AIN1.

What power management modes are available on the AD7888ARUZ-REEL7?

The AD7888ARUZ-REEL7 offers four programmable power modes via PM1/PM0 bits: Normal Operation (full power, fastest throughput), Full Shutdown (1 µA max at 2.7–3.6 V), Autoshutdown (enters shutdown after each conversion; 5 µs wake-up), and Autostandby (reference remains active; faster wake-up than autoshutdown). These modes allow precise trade-offs between power consumption and latency.

Is the AD7888ARUZ-REEL7 compatible with standard SPI interfaces?

Yes, the AD7888ARUZ-REEL7 features a native SPI-compatible serial interface that also supports QSPI, MICROWIRE, and DSP protocols. It uses CS as frame sync, SCLK for timing, DIN for control register loading (MSB-first on rising edge), and DOUT for result output (16-bit frame: 4 zeros + 12-bit result, MSB-first on falling edge), requiring no level-shifting or protocol translation for common microcontrollers.