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Home > Products > Integrated Circuits (ICs) > Data Acquisition > Analog to Digital Converters (ADC)

Analog Devices Inc. AD7657BSTZ-1-RL

Name: AD7657BSTZ-1-RL
Brand: Analog Devices Inc.
SKU: AD7657BSTZ-1-RL
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: AD7657BSTZ-1-RL

Manufacturer:: Analog Devices Inc.

Category:: Analog to Digital Converters (ADC)

Package:: 64-LQFP

Datasheet:: AD7657BSTZ-1-RL.pdf

Description:: IC ADC 14BIT SAR 64LQFP

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Product details

Overview

AD7657BSTZ-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 high-accuracy power line monitoring and multiaxis industrial control systems.

For engineers reviewing the AD7657BSTZ-1-RL datasheet, AD7657BSTZ-1-RL pinout, AD7657BSTZ-1-RL application, or AD7657BSTZ-1-RL equivalent, key selection criteria include simultaneous 6-channel sampling capability, iCMOS® process enabling ±16.5 V analog supply tolerance, 83.5 dB SNR at 10 kHz, 140 mW operational power, and 64-lead LQFP package compatibility with AD7656-1/AD7658-1 software interface.

Technical Context

The AD7657BSTZ-1-RL integrates six independent 14-bit SAR ADCs on a single iCMOS® die, each with dedicated track-and-hold amplifiers supporting up to 4.5 MHz full-power bandwidth. It uses an internal oscillator and three CONVST pins (A/B/C) to enable independent, simultaneous sampling of three ADC pairs (V1/V2, V3/V4, V5/V6).

It supports pin- and software-compatible operation with AD7656-1/AD7658-1 via shared parallel/serial/daisy-chain interfaces, and features hardware- or software-selectable input ranges (±4 × VREF or ±2 × VREF), REFEN/DIS-controlled reference buffer enable, and STBY-driven 315 µW full power-down mode.

Key Specifications

Parameter	Value and Actual Design Meaning
Resolution	14-bit - guarantees monotonic output and no missing codes across full operating temperature range.
Throughput Rate	250 kSPS - enables real-time capture of 50/60 Hz power harmonics up to 40th order with oversampling margin.
SNR	83.5 dB at 10 kHz - delivers >13.5 effective number of bits (ENOB) for precision measurement in noisy industrial environments.
Analog Input Range	±10 V or ±5 V - selectable via RANGE pin or control register, supporting direct connection to standard industrial transducers.
Power Dissipation	140 mW at 250 kSPS - achieved with 5 V AVCC/DVCC/VDRIVE and ±16.5 V analog supplies, enabling thermally constrained designs.
Channel Isolation	−100 dB - ensures minimal crosstalk between simultaneously sampled channels during multichannel transient capture.
Reference	On-chip 2.5 V ±10 mV reference with 6 ppm/°C tempco - eliminates external reference component and reduces BOM count.

Pinout & Package

AD7657BSTZ-1-RL is housed in a 64-lead LQFP (10 mm × 10 mm, 0.5 mm pitch) with exposed thermal pad. Pin functions are defined per Analog Devices Rev. D datasheet Figure 3 and Table 7.

Pin/Terminal	Circuit Role	Design Meaning
V1–V6	Analog Input Channels	Single-ended, high-impedance inputs supporting ±10 V/±5 V ranges; each pair (V1/V2, etc.) shares one CONVST signal for synchronized sampling.
CONVST A/B/C	Conversion Start Control	Three independent TTL/CMOS-compatible inputs triggering simultaneous conversions on two channels each - enables flexible multistage acquisition timing.
DB0–DB15	Parallel Data Bus	16-bit bidirectional bus supporting 16-bit read/write; DB0–DB2 also serve as channel select lines (SEL A/B/C) in serial mode.
WR/REFEN/DIS	Write / Reference Enable	Multi-function pin: active-low write strobe in parallel mode; enables/disables internal reference buffer when used as REFEN/DIS.
SER/PAR SEL	Interface Mode Select	Hardware-configurable pin selecting between high-speed parallel (default) or SPI/QSPI/MICROWIRE™-compatible serial interface.
STBY	Standby Control	Active-high input reducing total current to 60 µA (full power-down) or 7 mA (partial power-down), critical for energy-sensitive applications.

Key Features

Feature	Design Value
Simultaneous 6-channel sampling	Enables phase-coherent acquisition across all inputs without time-skew errors - essential for power quality analysis and motor phase current monitoring.
iCMOS® process technology	Supports ±16.5 V analog supplies while maintaining 5 V digital logic compatibility - eliminates level-shifting circuitry in high-voltage industrial front-ends.
Daisy-chain serial interface	Allows up to 4 AD7657BSTZ-1-RL devices to share one SPI bus with single CS, reducing microcontroller GPIO and PCB routing complexity.
Reduced decoupling requirements	Requires only one 1 µF capacitor per REFCAP pin (REFCAPA/B/C) and simplified AVCC/DVCC filtering versus legacy AD7657 - lowers layout risk and board area.
True bipolar input architecture	Accepts ±10 V or ±5 V directly without external op-amp level shifting - simplifies sensor interface for current transformers and voltage dividers.

Applications

Power Line Monitoring	Industrial Motor Control
Use Scenario: Real-time acquisition of voltage and current waveforms across three-phase distribution panels with harmonic analysis up to 2.5 kHz. IC Role / Device Role / Timing Role: Simultaneous 6-channel ADC captures synchronized V_A, V_B, V_C, I_A, I_B, I_C samples at 250 kSPS to preserve phase relationships for FFT-based THD calculation. Use Value: −100 dB channel-to-channel isolation prevents cross-phase interference; 83.5 dB SNR ensures accurate RMS and crest factor computation under EMI-rich substation conditions.	Use Scenario: Closed-loop position and torque feedback in servo drives using resolver or encoder analog outputs and current sense signals. IC Role / Device Role / Timing Role: Simultaneously samples motor phase currents (I_U, I_V, I_W) and rotor position analog signals (sin/cos) with <4 ns aperture delay matching to minimize vector control angle error. Use Value: 4 ns aperture delay matching and 35 ps jitter enable <0.1° electrical angle uncertainty at 10 kHz PWM frequencies - critical for smooth low-speed torque delivery.
Multiaxis Positioning Systems	Programmable Logic Controller (PLC) Analog Input Modules
Use Scenario: High-precision coordinate measurement machines (CMMs) acquiring displacement sensor outputs from X/Y/Z linear encoders and tilt sensors. IC Role / Device Role / Timing Role: Six independent ADCs digitize analog outputs from LVDTs, capacitive sensors, and inclinometers with synchronized sampling to correlate spatial motion vectors. Use Value: 14-bit resolution and ±1 LSB INL ensure sub-micron positional accuracy over full industrial temperature range (−40°C to +85°C).	Use Scenario: Modular PLC backplane I/O cards requiring isolated, high-density analog input channels with field-replaceable configuration. IC Role / Device Role / Timing Role: Core ADC engine in 16-channel analog input module, interfacing via parallel bus to FPGA-based data aggregator with configurable gain and range per channel. Use Value: Pin/software compatibility with AD7656-1/AD7658-1 allows single PCB design supporting 12-/14-/16-bit variants - reduces inventory and qualification effort.

Power Line Monitoring

Industrial Motor Control

Use Scenario: Real-time acquisition of voltage and current waveforms across three-phase distribution panels with harmonic analysis up to 2.5 kHz.

IC Role / Device Role / Timing Role: Simultaneous 6-channel ADC captures synchronized V_A, V_B, V_C, I_A, I_B, I_C samples at 250 kSPS to preserve phase relationships for FFT-based THD calculation.

Use Value: −100 dB channel-to-channel isolation prevents cross-phase interference; 83.5 dB SNR ensures accurate RMS and crest factor computation under EMI-rich substation conditions.

Use Scenario: Closed-loop position and torque feedback in servo drives using resolver or encoder analog outputs and current sense signals.

IC Role / Device Role / Timing Role: Simultaneously samples motor phase currents (I_U, I_V, I_W) and rotor position analog signals (sin/cos) with <4 ns aperture delay matching to minimize vector control angle error.

Use Value: 4 ns aperture delay matching and 35 ps jitter enable <0.1° electrical angle uncertainty at 10 kHz PWM frequencies - critical for smooth low-speed torque delivery.

Multiaxis Positioning Systems

Programmable Logic Controller (PLC) Analog Input Modules

Use Scenario: High-precision coordinate measurement machines (CMMs) acquiring displacement sensor outputs from X/Y/Z linear encoders and tilt sensors.

IC Role / Device Role / Timing Role: Six independent ADCs digitize analog outputs from LVDTs, capacitive sensors, and inclinometers with synchronized sampling to correlate spatial motion vectors.

Use Value: 14-bit resolution and ±1 LSB INL ensure sub-micron positional accuracy over full industrial temperature range (−40°C to +85°C).

Use Scenario: Modular PLC backplane I/O cards requiring isolated, high-density analog input channels with field-replaceable configuration.

IC Role / Device Role / Timing Role: Core ADC engine in 16-channel analog input module, interfacing via parallel bus to FPGA-based data aggregator with configurable gain and range per channel.

Use Value: Pin/software compatibility with AD7656-1/AD7658-1 allows single PCB design supporting 12-/14-/16-bit variants - reduces inventory and qualification effort.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
AD7656BSTZ-1-RL	16-bit resolution, 88 dB SNR, higher DC accuracy (±1 LSB INL), identical pinout and interface.	Better suited for metrology-grade measurements where 16-bit ENOB and <0.05% FSR full-scale error are required.	Select when resolution and DC precision outweigh cost and power constraints.
AD7658BSTZ-1-RL	12-bit resolution, 73.5 dB SNR, lower power (140 mW same, but faster wake-up), identical package and software stack.	Optimized for high-channel-count, cost-sensitive applications like HVAC sensor aggregation where 12-bit dynamic range suffices.	Select when system-level SNR budget permits lower resolution and faster throughput is not needed.

Compared with AD7657BSTZ-1-RL, AD7656BSTZ-1-RL provides 2 extra bits of resolution and 4.5 dB higher SNR at the cost of ~15% higher power in full operation, while AD7658BSTZ-1-RL trades 2 bits and 10 dB SNR for reduced BOM cost and simpler calibration - all three share identical timing, packaging, and firmware footprint.

Availability

AD7657BSTZ-1-RL is available at Aetrix Electronics and suitable for power line monitoring, industrial motor control, and multiaxis positioning systems requiring stable component supply, long-term industrial lifecycle support, and guaranteed traceable sourcing.

Supply support for AD7657BSTZ-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, Inc. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, headquartered in Norwood, MA, with R&D and manufacturing operations worldwide.

The AD765x-1 family - including AD7657BSTZ-1-RL - was engineered for industrial data acquisition systems demanding simultaneous multichannel sampling, robust bipolar input handling, and reduced decoupling complexity in space-constrained, high-voltage environments.

FAQ

What is the maximum analog input frequency supported by the AD7657BSTZ-1-RL?

The AD7657BSTZ-1-RL supports a full-power bandwidth of 4.5 MHz (−3 dB) and 2.2 MHz (−0.1 dB), enabling accurate digitization of signals up to 2.2 MHz without significant amplitude loss. Its 10 ns aperture delay and 35 ps jitter ensure precise timing capture for high-frequency transients in power electronics and motor drive applications.

Does the AD7657BSTZ-1-RL require an external reference voltage?

No - the AD7657BSTZ-1-RL includes an integrated 2.5 V reference with ±10 mV initial accuracy, 6 ppm/°C temperature coefficient, and 150 ppm long-term stability. External reference use is optional and enabled via the REFEN/DIS pin; the internal reference eliminates BOM cost and layout complexity in most industrial applications.

How does the AD7657BSTZ-1-RL achieve simultaneous sampling across six channels?

The AD7657BSTZ-1-RL uses three dedicated CONVST pins (A, B, C) to trigger independent track-and-hold circuits for channel pairs: CONVST A for V1/V2, CONVST B for V3/V4, and CONVST C for V5/V6. This architecture ensures true simultaneity within 4 ns aperture delay matching, preserving phase coherence across all six inputs.

What power supply configurations are required for ±10 V input operation on the AD7657BSTZ-1-RL?

For ±10 V input range (±4 × VREF), the AD7657BSTZ-1-RL requires VDD = +10 V to +16.5 V and VSS = −10 V to −16.5 V, alongside AVCC/DVCC/VDRIVE = 4.75 V to 5.25 V. The iCMOS® process enables this wide analog supply range while maintaining 5 V digital compatibility - no external level shifters needed.

Is the AD7657BSTZ-1-RL compatible with SPI microcontrollers?

Yes - the AD7657BSTZ-1-RL supports SPI/QSPI™/MICROWIRE™/DSP-compatible serial interface when SER/PAR SEL is high. It operates up to 18 MHz SCLK, supports daisy-chain mode for multiple devices, and uses standard 16-bit frame format with MSB-first transmission - enabling direct connection to common ARM Cortex-M and Renesas RX microcontrollers.

AD7657BSTZ-1-RL Specifications

Product attributes: Attribute value

Manufacturer:: Analog Devices Inc.

Series:: iCMOS®

Package/Case:: 64-LQFP

Packaging:: Tape & Reel (TR)

Product Status:: Active

Number of Bits:: 14

Sampling Rate (Per Second):: 250k

Number of Inputs:: 6

Input Type:: Single Ended

Data Interface:: SPI, Parallel, DSP

Configuration:: S/H-ADC

Ratio - S/H:ADC:: 1:1

Number of A/D Converters:: 6

Architecture:: SAR

Reference Type:: External, Internal

Voltage - Supply, Analog:: 5V

Voltage - Supply, Digital:: 5V

Features:: Simultaneous Sampling, True Bipolar

Operating Temperature:: -40°C ~ 85°C

Supplier Device Package:: 64-LQFP (10x10)

Mounting Type:: Surface Mount

Grade:: -

Qualification:: -

AD7657BSTZ-1-RL FAQ

1.How can I place an order for AD7657BSTZ-1-RL through Aetrix?

Please submit a Request for Quotation (RFQ) for AD7657BSTZ-1-RL on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for AD7657BSTZ-1-RL reliable?

The price and inventory of AD7657BSTZ-1-RL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7657BSTZ-1-RL is usually 5 days.

3.What payment methods are accepted for AD7657BSTZ-1-RL?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7657BSTZ-1-RL transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for AD7657BSTZ-1-RL?

AD7657BSTZ-1-RL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your AD7657BSTZ-1-RL order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for AD7657BSTZ-1-RL?

For technical support, including AD7657BSTZ-1-RL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7657BSTZ-1-RL requirements.

6.How does Aetrix verify that AD7657BSTZ-1-RL is sourced from the original manufacturer or authorized distributors?

All AD7657BSTZ-1-RL products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that AD7657BSTZ-1-RL meets industry standards.

7.What is the process for return or replacement of AD7657BSTZ-1-RL?

All AD7657BSTZ-1-RL units undergo pre-shipment inspection (PSI). If there is an issue with AD7657BSTZ-1-RL, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The AD7657BSTZ-1-RL part is unused and in its original packaging.

Return procedure for AD7657BSTZ-1-RL:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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