Analog Devices Inc. AD7657YSTZ-1-RL

Overview

AD7657YSTZ-1-RL from Analog Devices is a 14-bit, 6-channel, simultaneous-sampling SAR ADC with true bipolar ±10 V/±5 V input ranges, 250 kSPS throughput, and on-chip 2.5 V reference-designed for multiaxis motor control and power line monitoring systems requiring synchronized analog acquisition across six independent channels.

For engineers reviewing the AD7657YSTZ-1-RL datasheet, AD7657YSTZ-1-RL pinout, AD7657YSTZ-1-RL application, or AD7657YSTZ-1-RL equivalent, key selection criteria include its iCMOS-based 64-lead LQFP package, ±1 LSB integral nonlinearity, 83.5 dB SNR at 10 kHz, parallel/serial/daisy-chain interface support, and hardware/software-selectable input range configuration.

Technical Context

The AD7657YSTZ-1-RL implements six independent successive approximation register (SAR) ADC cores on a single iCMOS die, enabling true simultaneous sampling via three dedicated CONVST pins (A/B/C) that trigger paired conversions (V1/V2, V3/V4, V5/V6). Its track-and-hold architecture supports up to 4.5 MHz full-power bandwidth with 35 ps aperture jitter and 4 ns aperture delay matching.

It integrates on-chip reference buffers and decoupling capacitor terminals (REFCAPA/B/C), operates from dual ±16.5 V analog supplies (VDD/VSS) and 4.75–5.25 V digital rails (AVCC/DVCC/VDRIVE), and features STBY-driven full power-down mode consuming only 315 µW-optimized for high-channel-count industrial data acquisition where timing coherence and noise immunity are critical.

Key Specifications

Pinout & Package

AD7657YSTZ-1-RL is housed in a 64-lead LQFP package (10 mm × 10 mm, 0.5 mm pitch) with exposed pad for thermal enhancement. Pin functions are defined per Analog Devices Rev. D datasheet, including dedicated analog input (V1–V6), reference decoupling (REFCAPA/B/C), conversion control (CONVST A/B/C), and dual-mode interface (parallel DB0–DB15 + serial SCLK/DOUT A–C).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar multichannel simultaneous-sampling ADC applications.

Compared with AD7657YSTZ-1-RL, AD7656BSTZ-1 delivers higher resolution at the expense of increased cost and power, while AD7658BSTZ-1 trades precision for lower power and cost-making AD7657YSTZ-1-RL the optimal balance for industrial control systems needing verified 14-bit performance with robust noise immunity.

Availability

AD7657YSTZ-1-RL is available at Aetrix Electronics and suitable for power line monitoring, multiaxis positioning, and industrial PLC I/O modules requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.

Supply support for AD7657YSTZ-1-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 is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets.

The AD7657YSTZ-1-RL belongs to the AD7656-1/AD7657-1/AD7658-1 family-engineered for high-channel-count, simultaneous-sampling data acquisition in harsh industrial environments where timing coherence, bipolar input flexibility, and integrated reference stability are essential.

FAQ

What is the maximum analog input frequency supported by the AD7657YSTZ-1-RL?

The AD7657YSTZ-1-RL supports a full-power bandwidth of 4.5 MHz at −3 dB and 2.2 MHz at −0.1 dB, enabling accurate digitization of signals up to 4.5 MHz. This specification is validated under standard operating conditions with AVCC = DVCC = VDRIVE = +5.25 V, VDD = +16.5 V, VSS = −16.5 V, and fSAMPLE = 250 kSPS. The device's 35 ps aperture jitter and 4 ns aperture delay matching ensure fidelity for high-frequency transient capture in power electronics applications.

Does the AD7657YSTZ-1-RL require external reference components?

No, the AD7657YSTZ-1-RL includes an on-chip 2.5 V reference with ±1% initial accuracy, 6 ppm/°C temperature coefficient, and 150 ppm long-term stability. It provides buffered reference output (REFIN/REFOUT) and dedicated decoupling terminals (REFCAPA/B/C) for attaching 1 µF capacitors to AGND-eliminating need for external reference ICs or trimming networks in most industrial designs.

How does the AD7657YSTZ-1-RL achieve simultaneous sampling across six channels?

The AD7657YSTZ-1-RL achieves true simultaneous sampling using three dedicated CONVST pins (A, B, C), each controlling a pair of ADCs: CONVST A triggers V1/V2, CONVST B triggers V3/V4, and CONVST C triggers V5/V6. All six channels sample at the exact same instant upon edge detection, with aperture delay matching of ≤4 ns-ensuring phase-coherent acquisition required for vector control and power quality analysis.

What interface modes does the AD7657YSTZ-1-RL support?

The AD7657YSTZ-1-RL supports high-speed parallel (16-bit DB0–DB15 bus with BUSY/CS/RD/WR), serial SPI/QSPI/MICROWIRE-compatible (with SCLK, DOUT A/B/C), and daisy-chain configurations. Interface mode is selected via the SER/PAR SEL pin; in serial mode, multiple AD7657YSTZ-1-RL devices can be cascaded using DCEN and DCIN/DCOUT signals-reducing host interface resource usage in multi-ADC systems.

What is the operating temperature range for the AD7657YSTZ-1-RL?

The AD7657YSTZ-1-RL is rated for operation from −40°C to +125°C (Y grade), making it suitable for extended-temperature industrial environments such as motor drives, solar inverters, and outdoor power monitoring equipment. This rating is confirmed in the Absolute Maximum Ratings table (Page 10) and applies across full electrical specifications including INL, SNR, and throughput rate.