Analog Devices Inc. AD7989-1BCPZ-R2

Overview

AD7989-1BCPZ-R2 from Analog Devices is a 18-bit, 100 kSPS successive approximation register (SAR) analog-to-digital converter with true differential input, ±VREF range, zero-latency architecture, and SPI-compatible serial interface. It operates from a single 2.5 V supply with separate 1.8 V–5 V logic interface (VIO), targets precision data acquisition in automated test equipment and medical instrumentation, and delivers 99 dB dynamic range at 5 V reference.

For engineers reviewing the AD7989-1BCPZ-R2 datasheet, AD7989-1BCPZ-R2 pinout, AD7989-1BCPZ-R2 application, or AD7989-1BCPZ-R2 equivalent, key selection criteria include its 100 kSPS throughput, ±2 LSB INL max, 400 µW VDD-only power at 100 kSPS, 10-lead LFCSP package, and differential input compatibility with external references from 2.4 V to 5.1 V.

Technical Context

The AD7989-1BCPZ-R2 implements a charge redistribution SAR architecture with integrated track-and-hold, enabling zero-latency conversion and no pipeline delay. Its differential input stage accepts ±VREF signals with common-mode range centered at VREF/2 and supports external reference voltages independently scaled from 2.4 V to 5.1 V.

It features a proprietary SPI-/QSPI-/MICROWIRE-/DSP-compatible serial interface with dual-mode operation: chip-select (CS) mode for point-to-point communication and chain mode for daisy-chaining multiple ADCs on a single SDO line. Conversion is triggered by the rising edge of CNV, and output data is available immediately after conversion completion with no pipeline delay.

Key Specifications

Pinout & Package

AD7989-1BCPZ-R2 is housed in a 3 mm × 3 mm, 10-lead LFCSP (CP-10-9) package with exposed pad. The package supports low thermal resistance (θJC = 2.96°C/W) and is rated for −40°C to +85°C operation.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 18-bit SAR ADC applications.

Compared with AD7989-5BCPZ-R2 and AD7691BRMZ, AD7989-1BCPZ-R2 uniquely balances ultra-low 700 µW power at 100 kSPS, external reference programmability (2.4–5.1 V), and independent VIO support - making it optimal for portable, multi-sensor, battery-operated precision DAQ where power, accuracy, and interface flexibility are jointly constrained.

Availability

AD7989-1BCPZ-R2 is available at Aetrix Electronics and suitable for automated test equipment, medical instrumentation, and machine automation requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.

Supply support for AD7989-1BCPZ-R2 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 industrial, automotive, communications, and healthcare markets since 1965.

AD7989-1BCPZ-R2 belongs to Analog Devices' precision SAR ADC product line, engineered specifically for high-resolution, low-power, zero-latency data acquisition in portable and embedded measurement systems.

FAQ

What is the maximum sampling rate of the AD7989-1BCPZ-R2?

The AD7989-1BCPZ-R2 has a fixed maximum throughput of 100 kSPS. This is a hard limit defined by its internal conversion clock and architecture - it cannot operate at the 500 kSPS rate of the AD7989-5 variant. At 100 kSPS, the AD7989-1BCPZ-R2 achieves 700 µW total power dissipation and maintains ±2 LSB INL over −40°C to +85°C.

Does the AD7989-1BCPZ-R2 require an external reference voltage?

Yes, the AD7989-1BCPZ-R2 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 10 µF capacitor to GND. Unlike some SAR ADCs, it does not include an internal reference, enabling precise system-level calibration and flexibility across varying sensor output spans.

What package type is used for the AD7989-1BCPZ-R2?

The AD7989-1BCPZ-R2 is supplied in a 3 mm × 3 mm, 10-lead LFCSP (Lead Frame Chip Scale Package) with exposed pad, designated CP-10-9 in Analog Devices' ordering guide. This package offers θJC = 2.96°C/W and is RoHS-compliant, optimized for compact, thermally efficient PCB layouts in space-constrained applications.

Can the AD7989-1BCPZ-R2 interface with a 1.8 V microcontroller?

Yes, the AD7989-1BCPZ-R2 supports 1.8 V digital logic through its dedicated VIO pin, which accepts 1.71 V to 5.5 V. When VIO = 1.8 V, digital input thresholds adjust accordingly (e.g., VIH ≈ 1.62 V), and SDO output meets 1.8 V logic levels - enabling direct connection to low-voltage MCUs without level-shifting circuitry.

What is the analog input configuration of the AD7989-1BCPZ-R2?

The AD7989-1BCPZ-R2 features a true differential analog input pair (IN+, IN−) with a voltage range of ±VREF. The common-mode input range is tightly centered at VREF/2 (±2.5% of VREF), and it achieves ≥67 dB common-mode rejection at 450 kHz - making it suitable for high-noise industrial environments where differential signaling improves signal integrity.