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Analog Devices Inc. AD7657BSTZ-1
- Part No.:
- AD7657BSTZ-1
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 64-LQFP
- Datasheet:
-
AD7657BSTZ-1.pdf
- Description:
- IC ADC 14BIT SAR 64LQFP
- Quantity:
- Payment:
- Shipping:
Inventory:3,809
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Product details
Overview
AD7657BSTZ-1 from Analog Devices is a 14-bit, 6-channel, simultaneous-sampling successive approximation 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 control systems.
For engineers reviewing the AD7657BSTZ-1 datasheet, AD7657BSTZ-1 pinout, AD7657BSTZ-1 application, or AD7657BSTZ-1 equivalent, this page delivers verified specifications, validated pin functions, confirmed interface modes (parallel/serial/daisy-chain), and real-world timing and noise performance data - all specific to the AD7657BSTZ-1 variant.
Technical Context
The AD7657BSTZ-1 implements six independent SAR ADC cores on iCMOS process technology, enabling ±16.5 V analog supply operation while maintaining low power (140 mW at 250 kSPS) and high channel isolation (−100 dB). Its three CONVST pins (A/B/C) support independent, simultaneous sampling of three ADC pairs (V1/V2, V3/V4, V5/V6).
It integrates on-chip reference buffers and supports both internal (2.5 V) and external reference configurations, with hardware/software-selectable input ranges (±4×VREF or ±2×VREF) and dual-mode digital interface: high-speed parallel bus or SPI/QSPI/MICROWIRE-compatible serial with daisy-chain capability.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 14-bit - guarantees monotonic output and no missing codes across full operating temperature range. |
| Sampling Rate | 250 kSPS - enables capture of up to 4.5 MHz full-power bandwidth signals with ≤3.1 µs conversion time. |
| Input Range | ±10 V or ±5 V - selectable via RANGE pin or control register, supporting true bipolar industrial sensor interfacing. |
| SNR / SINAD | 83.5 dB / 82.5 dB at 10 kHz - ensures high-fidelity digitization for precision instrumentation and energy metering. |
| Channel Isolation | −100 dB - prevents crosstalk between simultaneously sampled channels in multichannel power monitoring. |
| Power Dissipation | 140 mW at 250 kSPS - achieved with AVCC/DVCC/VDRIVE = 5.25 V, VDD = +16.5 V, VSS = −16.5 V. |
| Reference | Internal 2.49–2.51 V ±25 ppm/°C - eliminates need for external reference in cost-sensitive designs requiring <0.1% FSR accuracy. |
Pinout & Package
AD7657BSTZ-1 is housed in a 64-lead LQFP package (10 mm × 10 mm, 0.5 mm pitch) with separate analog/digital ground planes and dedicated reference decoupling pins.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| V1–V6 | Analog Input Channels | Single-ended, high-impedance (10–14 pF) inputs supporting ±4×VREF or ±2×VREF ranges; require external 240 Ω series resistors if driven from isolated supplies. |
| CONVST A/B/C | Conversion Start Control | Independent edge-triggered inputs initiating simultaneous sampling on ADC pairs (V1/V2, V3/V4, V5/V6); matching aperture delay ≤4 ns ensures inter-channel synchronization. |
| DB0–DB15 | Data Bus / Serial Output | Configurable as 16-bit parallel data bus (DB0–DB15) or serial DOUT A/B/C outputs; DB6 = SCLK, DB7 = HBEN/DCEN for daisy-chain enable. |
| REFCAPA/B/C | Reference Decoupling Terminals | Three dedicated pins (Pins 54, 56, 58) each requiring 1 µF capacitor to AGND to stabilize reference buffer for corresponding ADC pair. |
| RANGE / H/S SEL | Input Range Selection | HARDWARE mode (RANGE pin) or SOFTWARE mode (RNGx bits) selects ±10 V (±4×VREF) or ±5 V (±2×VREF) full-scale range. |
| STBY | Power-Down Control | Active-high signal reducing current draw to 60 µA (full standby) or 7 mA (partial power-down), enabling dynamic power management in battery-backed systems. |
Key Features
| Feature | Design Value |
|---|---|
| Six independent 14-bit ADCs | Enables synchronized acquisition across six channels without multiplexer-induced delay or settling errors - critical for vector measurements in power analyzers. |
| iCMOS process technology | Supports ±16.5 V analog supplies while achieving 140 mW operational power - reduces need for discrete level-shifting and high-voltage op-amps. |
| True bipolar analog inputs | Accepts ±10 V or ±5 V directly without external op-amp biasing - simplifies front-end design for CT/PT interfaces and motor phase current sensing. |
| Dual-interface flexibility | Parallel mode delivers maximum throughput; serial mode with daisy-chain allows cascading multiple AD7657BSTZ-1 devices on one SPI bus - ideal for scalable multichannel DAQ systems. |
| On-chip 2.5 V reference | Provides stable, low-drift (25 ppm/°C) reference with integrated buffers - eliminates external reference IC and associated layout sensitivity in space-constrained PCBs. |
Applications
| Power Line Monitoring | Industrial Motor Control |
|---|---|
Use Scenario: Real-time voltage, current, and harmonic analysis in 3-phase distribution panels with neutral monitoring. IC Role / Device Role / Timing Role: Simultaneous sampling of six analog inputs (VA, VB, VC, IA, IB, IC) with ≤4 ns aperture matching to preserve phase relationships. Use Value: Enables accurate RMS, THD, and sequence component calculation per IEEE 519 without inter-channel skew-induced error. |
Use Scenario: Closed-loop field-oriented control (FOC) of servo drives with dual current feedback per phase. IC Role / Device Role / Timing Role: Six-channel acquisition of motor phase currents and DC bus voltage with hardware-triggered CONVST synchronization. Use Value: Eliminates software-based sampling delays, ensuring precise current vector reconstruction for torque ripple reduction. |
| Multiaxis Positioning Systems | Test & Measurement Equipment |
Use Scenario: High-speed coordinate measurement machines (CMM) capturing encoder, strain gauge, and thermal sensor data across six axes. IC Role / Device Role / Timing Role: Simultaneous sampling of position feedback and load sensors using shared CONVST timing to maintain spatial correlation. Use Value: Preserves mechanical system dynamics in post-processing by removing time-skew artifacts between axis readings. |
Use Scenario: Modular PXI-style data acquisition modules requiring high channel density and deterministic latency. IC Role / Device Role / Timing Role: ADC core in 6-channel slot-card architecture with daisy-chained serial interface to minimize FPGA I/O count. Use Value: Reduces host interface complexity while maintaining 250 kSPS aggregate rate per module - scalable to 48+ channels per chassis. |
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 | 16-bit resolution, higher SNR (88 dB), identical pinout and software interface - requires tighter layout for improved noise immunity. | Preferred for metrology-grade energy meters where 0.001% FSR accuracy is mandatory. | Select when resolution and dynamic range outweigh cost and power constraints. |
| AD7658BSTZ-1 | 12-bit resolution, lower SNR (73.5 dB), same package and timing - optimized for cost-sensitive motor drive current sensing. | Suitable for closed-loop control where 12-bit resolution meets torque ripple requirements below 1%. | Choose for high-volume industrial drives where BOM cost reduction is prioritized over harmonic analysis fidelity. |
Compared with AD7656BSTZ-1, AD7657BSTZ-1 trades 2 LSBs of resolution for lower power and reduced decoupling complexity; versus AD7658BSTZ-1, it delivers 2 additional bits and 9 dB higher SNR at modest cost premium - positioning AD7657BSTZ-1 as the balanced choice for mid-tier power quality analyzers and programmable logic controller (PLC) analog input modules.
Availability
AD7657BSTZ-1 is available at Aetrix Electronics and suitable for power line monitoring, industrial motor control, multiaxis positioning systems, and test & measurement equipment requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.
Supply support for AD7657BSTZ-1 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 AD7657BSTZ-1 belongs to the AD7656/AD7657/AD7658 family - engineered specifically for high-accuracy, multichannel simultaneous sampling in industrial automation, energy infrastructure, and precision instrumentation applications.
FAQ
What is the maximum analog input frequency supported by the AD7657BSTZ-1?
The AD7657BSTZ-1 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 10 kHz with 83.5 dB SNR. Its track-and-hold amplifier settles within 550 ns, making it suitable for anti-aliasing filter design targeting 50/60 Hz power harmonics and fast transient detection in grid-edge inverters.
Does the AD7657BSTZ-1 require external reference components?
No - the AD7657BSTZ-1 integrates a 2.5 V reference with ±25 ppm/°C temperature coefficient and 150 ppm long-term stability. It only requires three 1 µF capacitors on REFCAPA/B/C pins (Pins 54/56/58) tied to AGND. External reference is optional via REFIN/REFOUT (Pin 51) for applications demanding tighter initial accuracy or custom voltage scaling.
How does the AD7657BSTZ-1 achieve simultaneous sampling across six channels?
The AD7657BSTZ-1 uses three dedicated CONVST pins (A/B/C) to trigger three independent ADC pairs (V1/V2, V3/V4, V5/V6) with ≤4 ns aperture delay matching. This hardware-synchronized architecture avoids software-timed sampling jitter, preserving phase coherence essential for vector math in power quality analysis and motor control algorithms.
Can the AD7657BSTZ-1 interface directly with an FPGA using SPI mode?
Yes - the AD7657BSTZ-1 supports SPI/QSPI/MICROWIRE/DSP-compatible serial interface with configurable clock polarity and phase. In daisy-chain mode (SER/PAR SEL = 1, DCEN = 1), multiple AD7657BSTZ-1 devices share one SCLK, CS, and SDI/SDO lines, reducing FPGA pin count while maintaining 250 kSPS per device throughput.
What are the absolute maximum supply voltage ratings for the AD7657BSTZ-1?
The AD7657BSTZ-1 permits VDD up to +16.5 V and VSS down to −16.5 V relative to AGND/DGND, with AVCC/DVCC limited to 4.75–5.25 V and VDRIVE to 2.7–5.25 V. Exceeding −0.3 V to +16.5 V on VDD or −16.5 V to +0.3 V on VSS risks permanent damage; transient currents up to 100 mA are latch-up immune per ESD specification.
AD7657BSTZ-1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- iCMOS®
- Package/Case:
- 64-LQFP
- Packaging:
- Tray
- 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 FAQ
1.How can I place an order for AD7657BSTZ-1 through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7657BSTZ-1 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 reliable?
The price and inventory of AD7657BSTZ-1 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 is usually 5 days.
3.What payment methods are accepted for AD7657BSTZ-1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7657BSTZ-1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7657BSTZ-1?
AD7657BSTZ-1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7657BSTZ-1 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?
For technical support, including AD7657BSTZ-1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7657BSTZ-1 requirements.
6.How does Aetrix verify that AD7657BSTZ-1 is sourced from the original manufacturer or authorized distributors?
All AD7657BSTZ-1 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 meets industry standards.
7.What is the process for return or replacement of AD7657BSTZ-1?
All AD7657BSTZ-1 units undergo pre-shipment inspection (PSI). If there is an issue with AD7657BSTZ-1, 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 part is unused and in its original packaging.
Return procedure for AD7657BSTZ-1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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