Analog Devices Inc. AD7989-5BCPZ-RL7

Overview

AD7989-5BCPZ-RL7 from Analog Devices is an 18-bit, 500 kSPS successive approximation register (SAR) analog-to-digital converter with true differential input, ±V_REF range, zero-latency architecture, and SPI-compatible serial interface. It operates from a single 2.5 V supply with independent 1.71–5.5 V digital I/O (VIO), supports external reference voltages from 2.4 V to 5.1 V, and delivers 97 dB SINAD at 1 kHz with 5 V reference-ideal for high-precision data acquisition in medical instrumentation and automated test equipment.

For engineers reviewing the AD7989-5BCPZ-RL7 datasheet, AD7989-5BCPZ-RL7 pinout, AD7989-5BCPZ-RL7 application, or AD7989-5BCPZ-RL7 equivalent, key selection considerations include its 500 kSPS throughput, 18-bit no-missing-codes resolution, ±2 LSB INL, 3.5 mW total power at full speed, and dual-package availability in 3 mm × 3 mm LFCSP (CP-10-9) and MSOP (RM-10).

Technical Context

The AD7989-5BCPZ-RL7 implements a charge redistribution SAR architecture with on-chip track-and-hold, enabling zero pipeline delay and immediate data availability after conversion. Its differential input stage accepts ±V_REF signals with 67 dB CMRR at 450 kHz and supports common-mode ranges centered at 0.5×V_REF ±0.025×V_REF.

It features a proprietary SPI-/QSPI-/MICROWIRE-/DSP-compatible 3- or 4-wire interface with daisy-chain capability via SDI/CS pin mode selection, and uses separate VIO for logic-level flexibility across 1.8 V, 2.5 V, 3 V, and 5 V host systems-enabling direct interfacing without level shifters.

Key Specifications

Pinout & Package

AD7989-5BCPZ-RL7 is packaged in a 3 mm × 3 mm, 10-lead LFCSP (CP-10-9) with exposed pad. This thermally enhanced package achieves θ_JA = 48.7°C/W and θ_JC = 2.96°C/W, supporting high-density PCB layouts while maintaining thermal stability under continuous 500 kSPS operation.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-resolution SAR ADC applications.

Compared with AD7989-1BCPZ-RL7, AD7989-5BCPZ-RL7 trades higher power for 5× throughput and identical precision; versus AD4007BRMZ, it offers lower power and integrated reference flexibility at the cost of maximum speed-making AD7989-5BCPZ-RL7 optimal for 500 kSPS precision DAQ where thermal and power constraints apply.

Availability

AD7989-5BCPZ-RL7 is available at Aetrix Electronics and suitable for medical instrumentation, automated test equipment, and industrial data acquisition systems requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.

Supply support for AD7989-5BCPZ-RL7 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, with decades of expertise in precision data conversion and signal conditioning.

The AD7989 family was designed specifically for high-accuracy, low-power, multi-channel data acquisition in space- and power-constrained industrial and medical systems-emphasizing zero latency, flexible digital interfacing, and robust AC performance across temperature.

FAQ

What is the maximum sampling rate supported by the AD7989-5BCPZ-RL7?

The AD7989-5BCPZ-RL7 supports a maximum throughput of 500 kSPS, with conversion time of 1600 ns and acquisition time of 400 ns. This is fixed for the AD7989-5 variant-unlike the AD7989-1BCPZ-RL7, which is limited to 100 kSPS. The 500 kSPS rate is achievable across the full −40°C to +85°C temperature range with specified AC performance.

Does the AD7989-5BCPZ-RL7 require an external reference voltage?

Yes, the AD7989-5BCPZ-RL7 requires an external reference voltage applied to the REF pin, with a valid range of 2.4 V to 5.1 V. It does not include an internal reference. The device draws up to 250 µA from the REF pin, and Analog Devices recommends local decoupling with a 10 µF capacitor to GND for optimal noise performance.

Can the AD7989-5BCPZ-RL7 interface directly with a 1.8 V microcontroller?

Yes, the AD7989-5BCPZ-RL7 supports 1.8 V logic levels via its dedicated VIO pin (1.71 V to 5.5 V range). When VIO = 1.8 V, digital inputs meet VIH ≥ 0.9×VIO and VIL ≤ 0.1×VIO, and outputs drive VOH ≥ VIO − 0.3 V and VOL ≤ 0.4 V-enabling direct, level-shift-free connection to 1.8 V MCUs and FPGAs.

What package type is used for the AD7989-5BCPZ-RL7?

The AD7989-5BCPZ-RL7 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 provides superior thermal performance (θ_JA = 48.7°C/W) compared to the optional 10-lead MSOP (RM-10), and is compatible with standard reflow soldering per JEDEC J-STD-020.

Is the AD7989-5BCPZ-RL7 pin-compatible with other devices in the AD7989 family?

Yes, the AD7989-5BCPZ-RL7 shares identical pinout and footprint with the AD7989-1BCPZ-RL7 and all other variants in the AD7989 family-including both LFCSP and MSOP packages. This allows drop-in replacement between speed grades (e.g., upgrading from AD7989-1 to AD7989-5) without PCB redesign, provided thermal and power delivery are verified for the higher-speed variant.