AD7887ARZ-REEL7

Overview

The AD7887ARZ-REEL7 is a 12-bit successive approximation analog-to-digital converter (ADC) manufactured by Analog Devices Inc. It operates from a single 2.7 V to 5.25 V supply and supports throughput rates up to 125 kSPS with a 2 MHz serial clock. The device features two single-ended analog inputs configurable via an internal control register for either single-channel or dual-channel operation. In single-channel mode, the input range is 0 to VREF; in dual-channel mode, it is 0 to VDD. It includes an internal 2.5 V reference or accepts external references between 1.2 V and VDD. Key electrical specifications include a typical Signal-to-Noise Ratio of 71 dB, full-power bandwidth of 2.5 MHz, and maximum integral/differential nonlinearity of ±2 LSB. Power consumption is typically 2 mW in normal mode and drops to 3 μW in power-down mode.

Feature Summary

• Configurable single-channel or dual-channel operation using an on-chip control register.
• Flexible power management options including automatic shutdown after conversion and standby modes.
• Versatile serial interface compatible with SPI, QSPI, Microwire, and DSP standards.
• Integrated track-and-hold amplifier with fast acquisition time.

Applications

• Battery-powered systems such as personal digital assistants and mobile communications.
• Medical instruments requiring low power and high precision.
• Instrumentation and control systems.
• High-speed modems.

Procurement Notes

Verify that the specific ordering suffix matches the required package type, as the AD7887 series includes both MSOP and SOIC variants. Confirm the grade version (A or B) if specific temperature or performance tolerances are critical for the design. Ensure the reel packaging aligns with automated assembly requirements. Cross-reference the datasheet revision to confirm pinout and timing specifications match the design intent.

Selection Notes

Select this component when a compact 12-bit ADC with low power consumption is required for battery-operated devices. Choose the dual-channel configuration if monitoring multiple signals is necessary without increasing board space. Consider the internal reference capability to simplify circuit design, or use the external reference pin for higher precision applications. Ensure the system logic levels are compatible with the specified voltage ranges for reliable serial communication.

Part Context

The AD7887 is part of Analog Devices' family of micropower, high-speed ADCs designed for portable electronics. It utilizes CMOS construction to achieve low power dissipation while maintaining high speed. The device is qualified for automotive applications and is available in small 8-lead packages, making it suitable for space-constrained designs. It serves as a cost-effective solution for applications requiring moderate resolution and throughput.

Replacement Considerations

The AD7887BRZ is a parameter-equivalent alternative within the same product line, offering similar electrical characteristics but potentially in a different package style.