Analog Devices Inc. AD7887WARMZ-RL

Overview

AD7887WARMZ-RL from Analog Devices is a micropower, 12-bit successive approximation register (SAR) ADC with dual/single-channel operation, 125 kSPS throughput, 2.7 V to 5.25 V single-supply operation, and internal 2.5 V reference - used in battery-powered medical instruments and portable instrumentation where low power and compact size are critical.

For engineers reviewing the AD7887WARMZ-RL datasheet, AD7887WARMZ-RL pinout, AD7887WARMZ-RL application, or AD7887WARMZ-RL equivalent, key selection factors include its 8-lead MSOP package, SPI/QSPI/MICROWIRE-compatible serial interface, configurable single/dual-channel mode, and 1 μA shutdown current - all verified for automotive-grade −40°C to +125°C operation.

Technical Context

The AD7887WARMZ-RL implements a charge-redistribution DAC-based SAR architecture with integrated track-and-hold, acquiring signals in 500 ns. Its control logic supports an 8-bit write-only register that configures channel mode (single/dual), reference source (internal 2.5 V or external 1.2 V–VDD), and power management (four modes including auto-shutdown).

It features straight binary output coding, 0 V to VREF input range in single-channel mode, and 0 V to VDD range in dual-channel mode. The serial interface operates with SCLK up to 2 MHz, outputs 16-bit frames (4 leading zeros + 12-bit result MSB-first), and is compatible with SPI, QSPI, MICROWIRE, and DSP protocols.

Key Specifications

Pinout & Package

AD7887WARMZ-RL is housed in an 8-lead, 3 mm × 3 mm, 0.65 mm pitch MSOP package with exposed pad (RoHS-compliant, moisture sensitivity level 1). Pin 1 is marked by a dot; pin numbering follows standard MSOP top-view convention.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADS7822U and MAX11100ETE+, the AD7887WARMZ-RL uniquely combines 12-bit accuracy, dual/single-channel flexibility, internal 2.5 V reference, 1 μA shutdown, and AEC-Q100 qualification in an 8-lead MSOP - making it the only option meeting all four criteria for space- and power-constrained automotive and portable medical designs.

Availability

AD7887WARMZ-RL is available at Aetrix Electronics and suitable for battery-powered medical instruments, portable data loggers, and automotive body control modules requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for AD7887WARMZ-RL 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, Inc. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, headquartered in Norwood, MA.

The AD7887 product line delivers micropower, high-speed SAR ADCs optimized for portable instrumentation and automotive subsystems where precision, low power, and small footprint are essential.

FAQ

What is the maximum sampling rate supported by the AD7887WARMZ-RL?

The AD7887WARMZ-RL achieves a maximum throughput rate of 125 kSPS when operated with a 2 MHz SCLK. This rate is maintained across its full 2.7 V to 5.25 V supply range and over the −40°C to +125°C temperature range. The conversion time is fixed at 14.5 SCLK cycles, and acquisition time adds 1.5 SCLK cycles, totaling 16 cycles per sample. At 2 MHz, this yields exactly 125,000 samples per second - a value confirmed in the Rev. E datasheet Table 1 and Timing Specifications section.

Does the AD7887WARMZ-RL require an external reference voltage?

No, the AD7887WARMZ-RL includes an internal 2.5 V reference with ±50 ppm/°C temperature coefficient, accessible at the AIN1/VREF pin in single-channel mode. This reference can be overdriven by an external source from 1.2 V to VDD. In dual-channel mode, the device uses VDD as the reference, eliminating need for any external reference. The internal reference is enabled by default (REF bit = 0 in control register), and disabling it is recommended only when using dual-channel operation per datasheet guidance.

Can the AD7887WARMZ-RL operate in single-channel mode without connecting the DIN pin?

Yes, the AD7887WARMZ-RL supports read-only operation: tie the DIN pin to GND to force default single-channel mode with internal reference enabled. In this configuration, the part ignores serial data input and continuously converts AIN0, outputting results on DOUT. This eliminates MCU GPIO usage and firmware overhead for simple single-input applications - a feature explicitly documented in the General Description and Functional Block Diagram sections of the AD7887 Rev. E datasheet.

What are the power consumption characteristics of the AD7887WARMZ-RL in shutdown mode?

In shutdown mode (PM1/PM0 = 00 or 11, depending on CS behavior), the AD7887WARMZ-RL draws ≤1 μA at 2.7–3.6 V and ≤2 μA at 4.75–5.25 V, as specified in Table 1 under "Shutdown Mode" and confirmed in the Power Requirements section. Shutdown power dissipation is ≤5 μW at 5 V and ≤3 μW at 3 V. Wake-up time from shutdown is 5 μs typical, measured from CS rising edge to valid DOUT, per Table 2 timing parameter t9.

Is the AD7887WARMZ-RL pin-compatible with other members of the AD7887 family?

Yes, the AD7887WARMZ-RL shares identical pinout and functionality with all AD7887 variants in the 8-lead MSOP package, including AD7887BRMZ and AD7887ARMZ. Differences are limited to grade (A/B), temperature range, and packaging suffix - not pin assignment or electrical behavior. The Pin Configurations section (Figure 4) and Table 4 confirm identical MSOP pin mapping across all variants, and the Ordering Guide confirms WARMZ denotes the automotive-grade (−40°C to +125°C) MSOP version.