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Analog Devices Inc. AD7656YSTZ
- Part No.:
- AD7656YSTZ
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 64-LQFP
- Datasheet:
-
AD7656YSTZ.pdf
- Description:
- IC ADC 16BIT SAR 64LQFP
- Quantity:
- Payment:
- Shipping:
Inventory:1,832
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Product details
Overview
AD7656YSTZ from Analog Devices is a 16-bit, 6-channel simultaneous-sampling SAR ADC with true bipolar ±10 V/±5 V input ranges, 250 kSPS throughput, 86.5 dB SNR at 50 kHz, and on-chip 2.5 V reference - designed for high-precision power line monitoring and multi-axis industrial control systems.
For engineers reviewing the AD7656YSTZ datasheet, AD7656YSTZ pinout, AD7656YSTZ application, or AD7656YSTZ equivalent, this page delivers verified specifications, validated Y-version (−40°C to +125°C) performance data, interface mode details (parallel/serial/daisy-chain), and real-world design implications for simultaneous acquisition in noise-sensitive analog front-ends.
Technical Context
The AD7656YSTZ integrates six independent 16-bit SAR converters on a single iCMOS die, enabling true simultaneous sampling across all six channels via three dedicated CONVST pins (A/B/C). Its track-and-hold amplifiers support 12 MHz full-power bandwidth and achieve 4 ns max aperture delay matching between channel pairs.
It implements dual-range selection (±4 × VREF or ±2 × VREF) via hardware RANGE pin or software RNG bits, and features SPI-/QSPI-/MICROWIRE-/DSP-compatible serial interface with daisy-chain capability - all while maintaining 140 mW operational power dissipation at 250 kSPS with ±16.5 V analog supplies.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 16-bit - guarantees monotonic output with no missing codes over full temperature range (−40°C to +125°C). |
| Throughput Rate | 250 kSPS - enables real-time capture of 50/60 Hz power harmonics up to 12th order with oversampling margin. |
| SNR @ 50 kHz | 86.5 dB typ - supports >13.5 ENOB for high-fidelity waveform reconstruction in metering applications. |
| Analog Input Range | ±10 V or ±5 V - selectable via RANGE pin; eliminates external signal conditioning for legacy industrial sensor interfaces. |
| Channel Isolation | −100 dB typ - prevents crosstalk-induced measurement error when monitoring adjacent high-voltage phases. |
| Reference | On-chip 2.5 V ±1% output - reduces BOM count and layout sensitivity vs. external reference ICs. |
| Power Dissipation | 140 mW at 250 kSPS - enables thermal management in dense multi-ADC systems without forced air cooling. |
Pinout & Package
AD7656YSTZ is housed in a 64-lead LQFP package (10 mm × 10 mm, 0.5 mm pitch) with separate AGND (11 pins), DGND (2 pins), AVCC (8 pins), and DVCC (1 pin) for optimal analog-digital separation and low-noise operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| V1–V6 | Analog Input Channels | Single-ended, high-impedance inputs supporting true bipolar signals; each pair (V1/V2, V3/V4, V5/V6) shares one CONVST pin for synchronized sampling. |
| CONVST A/B/C | Conversion Start Control | Edge-triggered inputs initiating simultaneous conversion on respective channel pairs - critical for phase-coherent power quality analysis. |
| DB0–DB15 | Parallel Data Bus | 16-bit bidirectional bus supporting multiplexed read/write; DB0–DB2 also serve as SEL A/B/C for serial mode configuration. |
| SER/PAR/SEL | Interface Mode Select | Hardware-configurable pin determining parallel (high) or serial (low) interface operation - defines physical layer behavior at power-up. |
| REFIN/REFOUT | Reference I/O | Accepts external 2.5 V/3 V reference or outputs internal 2.5 V reference; enables precision ratio-metric measurements with external sensors. |
| STBY | Full Power-Down Control | Active-high input reducing supply current to ≤80 µA - preserves system-level energy budget during idle cycles in battery-backed monitors. |
Key Features
| Feature | Design Value |
|---|---|
| Simultaneous 6-channel sampling | Eliminates time-skew errors in multi-phase voltage/current acquisition - essential for accurate power vector calculations. |
| iCMOS process technology | Enables ±16.5 V analog supply rails in compact LQFP package - supports direct connection to industrial ±10 V sensor outputs without level-shifting. |
| Dual-range input selection | Hardware (RANGE pin) or software (RNG bits) control of ±10 V / ±5 V full-scale - simplifies firmware adaptation across sensor families. |
| Daisy-chain serial interface | Allows cascading multiple AD7656YSTZ devices on one SPI bus - reduces host GPIO count and PCB routing complexity in modular DAQ systems. |
| On-chip reference buffers | Three dedicated REFCAPx pins (A/B/C) with 10 µF + 100 nF decoupling per buffer - ensures stable reference for all six ADCs under dynamic load. |
Applications
| Power Line Monitoring | Industrial Motor Control |
|---|---|
Use Scenario: Real-time acquisition of three-phase voltage and current waveforms in smart grid meters and PQ analyzers. IC Role / Device Role / Timing Role: Simultaneous 6-channel sampling captures phase-aligned VA, VB, VC, IA, IB, IC with <4 ns inter-channel aperture matching. Use Value: Enables calculation of true RMS, harmonic distortion (THD), and flicker metrics compliant with IEC 61000-4-30 Class A. |
Use Scenario: Closed-loop position and torque feedback in servo drives with multi-axis motion controllers. IC Role / Device Role / Timing Role: Synchronized sampling of encoder signals, motor phase currents, and DC bus voltage for field-oriented control (FOC) algorithms. Use Value: Reduces current-sensing latency to <3.1 µs conversion time - improves torque ripple suppression and dynamic response. |
| Test & Measurement Equipment | Energy Management Systems |
Use Scenario: Multi-channel oscilloscope front-end for embedded diagnostics in programmable logic controllers (PLCs). IC Role / Device Role / Timing Role: High-speed parallel interface delivers 16-bit data at 250 kSPS to FPGA-based acquisition engines. Use Value: Achieves 12 MHz full-power bandwidth - supports transient capture of switching events in power electronics validation. |
Use Scenario: Distributed sensor node in building energy management systems (BEMS) monitoring HVAC, lighting, and submetering circuits. IC Role / Device Role / Timing Role: Low-power operation (100 µW in STBY) extends battery life in wireless sensor gateways. Use Value: On-chip 2.5 V reference and ±10 V input range enable direct interfacing with legacy 0–10 V HVAC control signals. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar simultaneous-sampling ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD7656BSTZ | Same architecture and pinout, but rated for −40°C to +85°C (B-grade) vs. Y-grade's +125°C operation. | Not suitable for under-hood automotive or high-temperature industrial enclosures where ambient exceeds 85°C. | Select AD7656YSTZ when extended temperature stability is required for uncooled deployments. |
| AD7606C-18 | 18-bit resolution, 1 MSPS, integrated analog front-end (PGA, anti-alias filter), but no true simultaneous sampling across all 8 channels. | Offers higher resolution and faster throughput, yet uses pseudo-simultaneous sampling with 100 ns inter-channel skew. | Choose AD7656YSTZ when strict phase coherence across all six channels is mandatory - e.g., for vector power calculations. |
Compared with AD7656BSTZ, AD7656YSTZ provides guaranteed performance up to +125°C without derating, while AD7606C-18 trades absolute simultaneity for higher resolution and integrated signal conditioning - making AD7656YSTZ optimal for thermally demanding, phase-critical 6-channel acquisition.
Availability
AD7656YSTZ is available at Aetrix Electronics and suitable for power line monitoring, industrial motor control, and test equipment requiring stable component supply across extended temperature environments.
Supply support for AD7656YSTZ 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, communications, automotive, and consumer markets since 1965.
The AD7656 family was engineered for high-accuracy, multi-channel data acquisition in electric utility and factory automation systems - emphasizing simultaneity, bipolar input flexibility, and robustness in noisy industrial environments.
FAQ
What is the maximum operating temperature for AD7656YSTZ?
The AD7656YSTZ is rated for operation from −40°C to +125°C, with full specification compliance across this extended industrial temperature range. This Y-grade qualification makes AD7656YSTZ suitable for deployment in high-temperature environments such as motor drive cabinets, outdoor power quality analyzers, and under-hood automotive test systems where ambient temperatures exceed 85°C.
Does AD7656YSTZ support true simultaneous sampling across all six channels?
Yes, AD7656YSTZ supports true simultaneous sampling using three dedicated CONVST pins (A, B, C), each controlling a pair of channels (V1/V2, V3/V4, V5/V6). Aperture delay matching is specified at ≤4 ns max between channels within a pair, ensuring phase-coherent acquisition required for vector-based power calculations and multi-axis control loops.
Can AD7656YSTZ operate with an external reference instead of the internal 2.5 V reference?
Yes, AD7656YSTZ accepts external references from 2.5 V to 3.0 V applied to the REFIN/REFOUT pin. When an external reference is used, the internal reference is disabled. This allows ratio-metric measurements with precision sensors and supports system-level calibration schemes where reference stability is managed externally.
What interface modes does AD7656YSTZ support, and how are they selected?
AD7656YSTZ supports parallel, serial, and daisy-chain modes. Interface selection is controlled by the SER/PAR/SEL pin: high = parallel mode (16-bit data bus), low = serial mode. In serial mode, DB0–DB2 function as SEL A/B/C to configure device address and communication parameters - enabling flexible integration with microcontrollers and FPGAs.
How is analog-digital isolation implemented on the AD7656YSTZ PCB layout?
AD7656YSTZ requires strict separation of analog and digital grounds: 11 AGND pins must connect to a dedicated analog ground plane, while DGND pins tie to digital ground - with both planes joined at a single point near the device. AVCC and DVCC supplies must be decoupled independently using 10 µF + 100 nF capacitors, and AGND–DGND potential difference must not exceed ±0.3 V, even transiently.
AD7656YSTZ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- iCMOS®
- Package/Case:
- 64-LQFP
- Packaging:
- Tray
- Product Status:
- Active
- Number of Bits:
- 16
- 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:
- -
AD7656YSTZ FAQ
1.How can I place an order for AD7656YSTZ through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7656YSTZ 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 AD7656YSTZ reliable?
The price and inventory of AD7656YSTZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7656YSTZ is usually 5 days.
3.What payment methods are accepted for AD7656YSTZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7656YSTZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7656YSTZ?
AD7656YSTZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7656YSTZ 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 AD7656YSTZ?
For technical support, including AD7656YSTZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7656YSTZ requirements.
6.How does Aetrix verify that AD7656YSTZ is sourced from the original manufacturer or authorized distributors?
All AD7656YSTZ 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 AD7656YSTZ meets industry standards.
7.What is the process for return or replacement of AD7656YSTZ?
All AD7656YSTZ units undergo pre-shipment inspection (PSI). If there is an issue with AD7656YSTZ, 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 AD7656YSTZ part is unused and in its original packaging.
Return procedure for AD7656YSTZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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