Analog Devices Inc. AD7621ASTZRL

Overview

AD7621ASTZRL from Analog Devices is a 16-bit, 3 MSPS, fully differential SAR analog-to-digital converter operating from a single 2.5 V supply. It integrates an internal 2.048 V reference, ±2 LSB INL, no missing codes, and supports parallel (16-/8-bit) or SPI/QSPI/MICROWIRE-compatible serial interfaces - deployed in high-speed data acquisition systems requiring precision timing and low-latency conversion.

For engineers reviewing the AD7621ASTZRL datasheet, AD7621ASTZRL pinout, AD7621ASTZRL application, or AD7621ASTZRL equivalent, key selection criteria include throughput mode flexibility (wideband warp/normal/impulse), differential input range (±VREF up to ±2.5 V), internal reference drift (±7 ppm/°C), power dissipation scaling with sample rate (65–86 mW at 3 MSPS), and LFCSP-48 package compatibility with high-density PCB layouts.

Technical Context

The AD7621ASTZRL uses charge redistribution SAR architecture with zero pipeline delay, enabling deterministic latency critical for real-time control loops. Its dual-mode reference system supports internal 2.048 V reference (±7 ppm/°C drift) or external reference up to 2.5 V, with dedicated PDREF/PDBUF controls for power optimization.

Three configurable throughput modes - wideband warp (3 MSPS), normal (2 MSPS), and impulse (1.25 MSPS) - dynamically scale power consumption while maintaining full 16-bit resolution and ±2 LSB INL. The device features both parallel (D[15:0]) and serial (SDOUT/SYNC/SCLK) interface paths, with SER/PAR, OB/2C, and BYTESWAP pins enabling flexible host integration across 2.5 V/3.3 V/5 V logic domains.

Key Specifications

Pinout & Package

AD7621ASTZRL is housed in a 48-lead LFCSP (Lead Frame Chip Scale Package) with exposed pad, optimized for thermal performance and high-density routing. Pin pitch is 0.5 mm; package dimensions are 7 mm × 7 mm × 0.85 mm (body height).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-speed precision ADC applications.

Compared with AD7621ASTZRL, AD7622BCPZ-RL7 offers superior linearity at slightly reduced speed and power, while ADS8860IPWR trades off throughput and integrated reference for smaller footprint and lower BOM count - making each suitable for distinct design priorities in test, medical, or industrial DAQ systems.

Availability

AD7621ASTZRL is available at Aetrix Electronics and suitable for medical instrumentation, high-speed data acquisition, and spectrum analysis requiring stable component supply, long-term lifecycle support, and traceable sourcing from authorized channels.

Supply support for AD7621ASTZRL 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, serving industrial, automotive, communications, and healthcare markets since 1965.

The AD7621ASTZRL belongs to Analog Devices' PulSAR® family of precision SAR ADCs, engineered for applications demanding high speed, low latency, and exceptional DC/AC accuracy - especially where pipeline ADC artifacts or sigma-delta latency are unacceptable.

FAQ

What is the maximum sampling rate supported by the AD7621ASTZRL?

The AD7621ASTZRL achieves a maximum throughput of 3 MSPS in wideband warp mode, with guaranteed specifications including ±2 LSB INL and 89 dB SINAD. This rate is sustained using the internal conversion clock and requires proper timing alignment of CNVST and BUSY signals per the datasheet's Table 3. At this rate, AD7621ASTZRL consumes 65–86 mW depending on reference configuration.

Does the AD7621ASTZRL require an external reference voltage?

No, the AD7621ASTZRL includes a factory-trimmed 2.048 V internal reference with ±7 ppm/°C temperature drift and 5 ms turn-on settling time. When PDREF and PDBUF are held low, the REF pin outputs this voltage - eliminating external reference components unless higher accuracy or different voltage levels (e.g., 2.5 V) are needed. AD7621ASTZRL supports external references up to AVDD (2.5 V) when PDREF = high.

How does the AD7621ASTZRL handle power management in low-duty-cycle applications?

The AD7621ASTZRL implements three power-scalable throughput modes: wideband warp (3 MSPS), normal (2 MSPS), and impulse (1.25 MSPS). In impulse mode, power dissipation scales linearly with throughput - dropping to ~42 mW at 1.25 MSPS. Additionally, the PD pin enables full power-down (<600 µW), and PDREF/PDBUF independently disable reference circuitry to minimize quiescent current when not sampling.

Can the AD7621ASTZRL interface directly with a 3.3 V FPGA or microcontroller?

Yes, the AD7621ASTZRL supports mixed-voltage operation: OVDD accepts 2.3–3.6 V, allowing direct connection to 3.3 V logic without level shifters. Its parallel and serial interfaces are compatible with SPI/QSPI/MICROWIRE protocols, and logic thresholds (VIH = 1.7 V min) ensure reliable signaling. For 3.3 V hosts, set OVDD = 3.3 V and configure SER/PAR, RD, and CS accordingly - AD7621ASTZRL maintains full specification compliance across this range.

What package type is used for the AD7621ASTZRL, and is it RoHS compliant?

The AD7621ASTZRL is supplied in a 48-lead LFCSP (CP-48-4) package with exposed thermal pad, measuring 7 mm × 7 mm × 0.85 mm. It is RoHS compliant and halogen-free, meeting JEDEC standards for moisture sensitivity level (MSL) 3. This package provides superior thermal performance versus LQFP alternatives and supports automated optical inspection (AOI) due to its coplanar lead structure - critical for high-reliability AD7621ASTZRL deployments.