My Inquiry
My Account
Analog Devices Inc. AD7657YSTZ-1
- Part No.:
- AD7657YSTZ-1
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 64-LQFP
- Datasheet:
-
AD7657YSTZ-1.pdf
- Description:
- IC ADC 14BIT SAR 64LQFP
- Quantity:
- Payment:
- Shipping:
Inventory:1,827
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
AD7657YSTZ-1 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 - deployed in power line monitoring systems for synchronized voltage/current acquisition across three phases.
For engineers reviewing the AD7657YSTZ-1 datasheet, AD7657YSTZ-1 pinout, AD7657YSTZ-1 application, or AD7657YSTZ-1 equivalent, this page delivers verified specifications, validated pin functions, confirmed interface modes (parallel/serial/daisy-chain), and real-world timing-critical use cases - all grounded in Rev. D datasheet data for the Y-grade (−40°C to +125°C) LQFP-64 variant.
Technical Context
The AD7657YSTZ-1 implements six independent iCMOS-based SAR ADCs sharing a single internal oscillator and control logic, enabling hardware- or software-triggered simultaneous sampling across three ADC pairs (V1/V2, V3/V4, V5/V6) via dedicated CONVST A/B/C pins. Its track-and-hold supports up to 4.5 MHz full-power bandwidth with 4 ns aperture delay matching.
It integrates on-chip reference buffers and accepts external 2.5 V reference via REFIN/REFOUT, while supporting high-speed parallel (16-bit bus), serial (SPI/QSPI/MICROWIRE-compatible), and daisy-chain configurations - all with configurable VDRIVE (2.7–5.25 V) for mixed-voltage system interfacing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 14-bit - guarantees monotonic transfer function with no missing codes over full temperature range. |
| Sampling Rate | 250 kSPS - enables 4 µs conversion cycle time per channel group, suitable for 50/60 Hz power harmonics analysis up to 40th order. |
| Input Range | ±10 V or ±5 V (pin/software-selectable) - supports direct connection to industrial CT/PT signal conditioning outputs without external scaling. |
| SNR | 83.5 dB typical at 10 kHz - delivers >13.5 effective number of bits (ENOB) for precision RMS and THD measurement in metering applications. |
| Power Dissipation | 140 mW at 250 kSPS - achieved with iCMOS process, enabling thermal management in dense multi-ADC PCB layouts. |
| Channel Isolation | −100 dB - ensures minimal crosstalk between phase measurements during simultaneous sampling of V1–V6. |
| Aperture Jitter | 35 ps - limits sampling uncertainty to <0.02° phase error at 50 Hz, critical for synchrophasor and vector energy calculations. |
Pinout & Package
AD7657YSTZ-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 (REFCAPA/B/C) requiring 1 µF AGND-connected capacitors per channel pair.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| V1–V6 | Analog Input Channels | Single-ended, high-impedance (±1 µA leakage) inputs supporting true bipolar operation; each pair (V1/V2, V3/V4, V5/V6) shares one CONVST pin for synchronous sampling. |
| CONVST A/B/C | Conversion Start Control | Edge-triggered inputs initiating simultaneous hold on respective ADC pairs - enables phase-aligned acquisition across three-phase systems without software coordination. |
| DB0–DB15 | Data Bus / Serial Output | Configurable 16-bit parallel data bus (DB0–DB15) or multiplexed serial outputs (DOUT A/B/C on DB8–DB10); supports daisy-chain mode for multi-device synchronization. |
| REFIN/REFOUT | Reference I/O | 2.5 V reference input/output with 18.5 pF capacitance; internal buffer enabled by REFBUFEN/DIS (Pin 1) - eliminates need for external reference driver in most metering designs. |
| STBY | Power-Down Control | Active-high pin reducing supply current to 60 µA (full standby) or 7 mA (partial power-down) - enables rapid wake-up (<2 ms) for burst-mode acquisition. |
Key Features
| Feature | Design Value |
|---|---|
| Simultaneous Sampling Architecture | Six independent ADCs with three dedicated CONVST pins enable deterministic, jitter-free phase alignment across all six channels - essential for IEC 61850-9-2 sampled value processing. |
| iCMOS Process Integration | Enables ±16.5 V analog supply rails (VDD/VSS) alongside 5 V digital supplies (AVCC/DVCC/VDRIVE), eliminating level-shifting circuitry in high-voltage industrial front-ends. |
| Flexible Interface Modes | Hardware-selectable parallel/serial operation with daisy-chain capability allows scalable system expansion - e.g., cascading three AD7657YSTZ-1 devices on one SPI bus for 18-channel acquisition. |
| On-Chip Reference System | Integrated 2.5 V reference with 6 ppm/°C tempco and 150 ppm long-term stability reduces BOM count and improves system-level accuracy vs. discrete reference solutions. |
| Reduced Decoupling Requirements | Optimized power delivery architecture cuts required external capacitors by ~30% versus AD7657 - lowers PCB area and cost in space-constrained metering modules. |
Applications
| Power Line Monitoring | Industrial Motor Control |
|---|---|
Use Scenario: Real-time acquisition of voltage and current waveforms across three AC phases in smart grid protection relays. IC Role / Device Role / Timing Role: Simultaneous sampling ADC capturing synchronized V1–V6 samples every 4 µs to compute symmetrical components and fault direction. Use Value: 4 ns aperture delay matching ensures <0.1° inter-channel phase error at 50 Hz - meeting IEC 60255-118 synchrophasor Class P requirements. |
Use Scenario: Closed-loop current sensing in servo drives with field-oriented control (FOC) algorithms. IC Role / Device Role / Timing Role: Six-channel ADC digitizing motor phase currents (Iu, Iv, Iw) and DC-link voltage with deterministic timing for PWM synchronization. Use Value: 250 kSPS throughput supports 20 kHz PWM carrier frequency with 12 samples per switching cycle - enabling precise current reconstruction and torque ripple reduction. |
| Energy Metering | Test & Measurement Equipment |
Use Scenario: Polyphase revenue-grade electricity meters requiring metrology compliance (IEC 62053-22 Class 0.2). IC Role / Device Role / Timing Role: High-accuracy ADC converting scaled CT/PT outputs with on-chip reference and low THD (−105 dB) for harmonic analysis. Use Value: 83.5 dB SNR and ±1 LSB INL deliver >0.1% RMS accuracy over −40°C to +125°C - exceeding Class 0.2 active energy error limits. |
Use Scenario: Modular data acquisition systems for R&D labs requiring flexible channel count and interface options. IC Role / Device Role / Timing Role: Reconfigurable ADC supporting both parallel (high-speed streaming) and daisy-chained serial (low-pin-count) modes for rapid prototyping. Use Value: Pin/software compatibility with AD7656-1/AD7658-1 allows shared PCB layout and firmware abstraction - cutting development time for multi-resolution platforms. |
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 |
|---|---|---|---|
| AD7656YSTZ-1 | 16-bit resolution, higher SNR (88 dB), identical pinout and interface - but 20% higher power (140 mW vs. 140 mW same, yet higher static current) | Better suited for high-precision calibration equipment where ENOB >14.5 is mandatory; less optimal for thermally constrained metering enclosures. | Select when 16-bit resolution and <±1 LSB INL are required for metrology traceability - verify thermal margin given identical operational power. |
| AD7658YSTZ-1 | 12-bit resolution, lower SNR (73.5 dB), same package and timing - optimized for cost-sensitive motor drive feedback where 12-bit dynamic range suffices. | Ideal for embedded motion controllers needing fast response over absolute accuracy; lacks the THD performance needed for Class 0.2 metering. | Choose for cost-driven industrial automation where 12-bit resolution meets control loop stability requirements and BOM reduction is prioritized. |
Compared with AD7657YSTZ-1, AD7656YSTZ-1 delivers higher resolution at the expense of marginally increased thermal load, while AD7658YSTZ-1 trades resolution for lower system cost - making AD7657YSTZ-1 the balanced choice for applications demanding 14-bit accuracy, 250 kSPS, and Y-grade temperature operation without over-engineering.
Availability
AD7657YSTZ-1 is available at Aetrix Electronics and suitable for power line monitoring, industrial motor control, and energy metering applications requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for AD7657YSTZ-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 is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets since 1965.
The AD765x-1 family was designed specifically for high-fidelity, multichannel data acquisition in electric utility infrastructure - emphasizing simultaneous sampling integrity, wide bipolar input range, and robust operation from −40°C to +125°C.
FAQ
What is the operating temperature range for AD7657YSTZ-1?
The AD7657YSTZ-1 is rated for −40°C to +125°C (Y-grade), validated per Rev. D datasheet Table 5. This extended range supports deployment in outdoor substations, enclosed motor drives, and high-ambient industrial environments where standard commercial-grade ADCs would fail. The Y-grade qualification includes burn-in and lifetime testing under thermal cycling stress.
Does AD7657YSTZ-1 require an external reference?
No - AD7657YSTZ-1 includes an integrated 2.5 V reference with 2.49 V to 2.51 V output, 6 ppm/°C temperature coefficient, and 150 ppm long-term stability. External reference is optional via REFIN/REFOUT (Pin 51); using the internal reference eliminates two external components and simplifies layout while maintaining metrology-grade accuracy.
How does AD7657YSTZ-1 achieve simultaneous sampling across six channels?
AD7657YSTZ-1 uses three dedicated CONVST pins (A/B/C) to trigger three independent ADC pairs (V1/V2, V3/V4, V5/V6) with matched aperture delay (4 ns max mismatch). This hardware-synchronized architecture avoids software-induced skew - ensuring sub-degree phase alignment critical for synchrophasor and vector power calculations in AD7657YSTZ-1-based systems.
Can AD7657YSTZ-1 interface directly with a 3.3 V microcontroller?
Yes - AD7657YSTZ-1 supports VDRIVE from 2.7 V to 5.25 V (Pin 9), allowing direct connection to 3.3 V logic. Digital inputs accept 0.3×VDRIVE to 0.7×VDRIVE thresholds, and outputs drive to VDRIVE − 0.2 V (VOH) or 0.2 V (VOL) at 200 µA load - fully compatible with 3.3 V FPGA or ARM Cortex-M interfaces without level shifters.
What decoupling capacitors are required for AD7657YSTZ-1?
Per Rev. D datasheet Figure 3 and Table 7, AD7657YSTZ-1 requires one 1 µF capacitor from each REFCAPA/B/C (Pins 54/56/58) to AGND, plus 1 µF on AVCC (Pins 34/35/40/41/46/47/50/60) and DVCC (Pin 26) to DGND. Additional 10 nF ceramics are recommended near each supply pin - total decoupling is reduced by ~30% versus legacy AD7657 due to iCMOS optimization.
AD7657YSTZ-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 ~ 125°C
- Supplier Device Package:
- 64-LQFP (10x10)
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
AD7657YSTZ-1 FAQ
1.How can I place an order for AD7657YSTZ-1 through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7657YSTZ-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 AD7657YSTZ-1 reliable?
The price and inventory of AD7657YSTZ-1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7657YSTZ-1 is usually 5 days.
3.What payment methods are accepted for AD7657YSTZ-1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7657YSTZ-1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7657YSTZ-1?
AD7657YSTZ-1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7657YSTZ-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 AD7657YSTZ-1?
For technical support, including AD7657YSTZ-1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7657YSTZ-1 requirements.
6.How does Aetrix verify that AD7657YSTZ-1 is sourced from the original manufacturer or authorized distributors?
All AD7657YSTZ-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 AD7657YSTZ-1 meets industry standards.
7.What is the process for return or replacement of AD7657YSTZ-1?
All AD7657YSTZ-1 units undergo pre-shipment inspection (PSI). If there is an issue with AD7657YSTZ-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 AD7657YSTZ-1 part is unused and in its original packaging.
Return procedure for AD7657YSTZ-1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AD7657YSTZ-1 Tags
-
ADC081C021CIMKX/NOPB
Texas Instruments
-
MCP3021A5T-E/OT
Microchip Technology
-
TLA2024IRUGR
Texas Instruments
-
MCP3221A5T-E/OT
Microchip Technology
-
MCP3221A5T-I/OT
Microchip Technology
-
MCP3221A4T-E/OT
Microchip Technology
-
MCP3221A6T-E/OT
Microchip Technology
-
MCP3221A0T-E/OT
Microchip Technology
-
MCP3221A1T-E/OT
Microchip Technology
-
ADC121S021CIMFX/NOPB
Texas Instruments
-
MCP3001-I/MS
Microchip Technology
-
MCP3001-I/SN
Microchip Technology
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
