Analog Devices Inc. AD7988-5BCPZ-RL

Overview

AD7988-5BCPZ-RL from Analog Devices is a 16-bit, pseudo-differential successive approximation register (SAR) analog-to-digital converter optimized for low-power, high-accuracy data acquisition in space- and power-constrained systems. It delivers 500 kSPS throughput, ±1.25 LSB max INL, 91.5 dB SNR at 10 kHz with 5 V reference, and operates from a single 2.5 V supply with 1.8 V–5 V logic interface - enabling precision sensing in medical instrumentation and automated test equipment.

For engineers reviewing the AD7988-5BCPZ-RL datasheet, AD7988-5BCPZ-RL pinout, AD7988-5BCPZ-RL application, or AD7988-5BCPZ-RL equivalent, this page provides verified specifications, validated pin functions, real-world use cases, and confirmed alternative parts - all grounded in Analog Devices' Rev. H datasheet and official package documentation.

Technical Context

The AD7988-5BCPZ-RL implements a zero-latency SAR architecture with proprietary SPI-/QSPI™-/MICROWIRE™-/DSP-compatible serial interface supporting both CS and daisy-chain modes. Its CNV rising edge initiates sampling of the pseudo-differential input (IN+ to IN−), referenced to an externally applied 2.4 V–5.1 V VREF independent of VDD.

It features separate VIO supply (1.71 V–5.5 V) for logic compatibility across voltage domains, internal acquisition timing with 400 ns acquisition time (C grade), and robust operation from −40°C to +125°C in its 10-lead 3 mm × 3 mm LFCSP package with exposed pad.

Key Specifications

Pinout & Package

AD7988-5BCPZ-RL is housed in a 10-lead 3 mm × 3 mm LFCSP (CP-10-9) with exposed thermal pad (EP), offering θJA = 80°C/W and θJC = 15°C/W for efficient heat dissipation in compact layouts.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 16-bit SAR ADC applications.

Compared with AD7988-1BCPZ-RL and AD7685BRMZ-REEL7, the AD7988-5BCPZ-RL uniquely balances 500 kSPS speed, 3.5 mW power, daisy-chain capability, and ±1.25 LSB INL - making it optimal for new designs demanding high throughput without sacrificing accuracy or integration density.

Availability

AD7988-5BCPZ-RL is available at Aetrix Electronics and suitable for medical instrumentation, automated test equipment, and industrial machine automation requiring stable component supply, extended temperature qualification, and long-term production continuity.

Supply support for AD7988-5BCPZ-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 AD7988-5BCPZ-RL belongs to Analog Devices' PulSAR® family of precision SAR ADCs, engineered for low-power, high-accuracy data acquisition in space-constrained, thermally demanding applications such as portable diagnostics and industrial control.

FAQ

What is the maximum sampling rate supported by the AD7988-5BCPZ-RL?

The AD7988-5BCPZ-RL supports a maximum throughput of 500 kSPS, as specified in its datasheet Rev. H. This is achieved with a conversion time of 1.2 μs (C grade) from CNV rising edge to valid data on SDO. The device maintains full 16-bit accuracy and ±1.25 LSB INL at this rate, making it suitable for high-speed transient capture in ATE and motor control feedback loops. Performance remains stable across the full −40°C to +125°C temperature range.

Does the AD7988-5BCPZ-RL require an external reference voltage?

Yes, the AD7988-5BCPZ-RL requires an external reference voltage applied to the REF pin. The specified range is 2.4 V to 5.1 V, and the reference must be decoupled with a local 10 µF capacitor to GND. Unlike internally referenced ADCs, this architecture allows designers to optimize SNR and dynamic range by selecting a reference that matches the sensor's output span - for example, using a 2.5 V reference for low-voltage MEMS sensors to maximize resolution utilization.

Can the AD7988-5BCPZ-RL interface directly with a 1.8 V microcontroller?

Yes, the AD7988-5BCPZ-RL can interface directly with a 1.8 V microcontroller via its dedicated VIO pin, which accepts 1.71 V to 5.5 V. When VIO = 1.8 V, the digital interface meets VIH ≥ 0.9 × VIO (≥1.62 V) and VIL ≤ 0.1 × VIO (≤0.18 V), ensuring reliable logic-level compatibility without external level shifters. This simplifies system integration in battery-powered IoT edge nodes and portable instrumentation.

What package type is used for the AD7988-5BCPZ-RL, and does it include thermal enhancement?

The AD7988-5BCPZ-RL uses a 10-lead 3 mm × 3 mm LFCSP package (CP-10-9) with an exposed thermal pad (EP). This package provides θJA = 80°C/W and θJC = 15°C/W under JEDEC-standard PCB conditions, enabling efficient heat dissipation in compact, high-density layouts. The exposed pad must be soldered to a thermal land connected to a solid GND plane to achieve rated thermal performance and ensure long-term reliability in high-temperature industrial environments.

How does the daisy-chain mode work on the AD7988-5BCPZ-RL?

Daisy-chain mode on the AD7988-5BCPZ-RL is activated when the SDI pin is held low during the CNV rising edge. In this mode, the SDI input passes the conversion result from the previous ADC in the chain with a 16-SCK-cycle delay, allowing multiple AD7988-5BCPZ-RL devices to share a single SDO line and three-wire interface (CNV, SCK, SDI). This eliminates the need for individual chip-select lines and reduces GPIO usage - ideal for scalable multi-channel DAQ systems where board space and firmware complexity are constrained.