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Analog Devices Inc. AD7656YSTZ-1
- Part No.:
- AD7656YSTZ-1
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 64-LQFP
- Datasheet:
-
AD7656YSTZ-1.pdf
- Description:
- IC ADC 16BIT SAR 64LQFP
- Quantity:
- Payment:
- Shipping:
Inventory:1,219
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Product details
Overview
AD7656YSTZ-1 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, 88 dB SNR at 10 kHz, and on-chip 2.5 V reference - deployed in power line monitoring systems for synchronized voltage/current waveform capture.
For engineers reviewing the AD7656YSTZ-1 datasheet, AD7656YSTZ-1 pinout, AD7656YSTZ-1 application, or AD7656YSTZ-1 equivalent, this page delivers verified specifications, validated LQFP-64 pin functions, confirmed iCMOS process advantages, and real-world multiaxis control and instrumentation use cases - all grounded in Rev. D datasheet data.
Technical Context
The AD7656YSTZ-1 implements six independent 16-bit successive approximation register (SAR) cores on Analog Devices' iCMOS process, enabling ±16.5 V analog supply operation while maintaining low power (140 mW at 250 kSPS) and high channel-to-channel isolation (−100 dB). Its three CONVST pins (A/B/C) support hardware-triggered simultaneous sampling across three ADC pairs (V1/V2, V3/V4, V5/V6).
It integrates on-chip reference buffers and supports parallel, serial (SPI/QSPI/MICROWIRE/DSP-compatible), and daisy-chain interface modes. The device uses twos-complement output coding, features 3.1 µs conversion time, and achieves 4.5 MHz full-power bandwidth with 35 ps aperture jitter - critical for coherent multi-channel acquisition in industrial power analytics.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 16 bits - guarantees monotonicity and no missing codes for precision measurement of AC waveforms and transients. |
| Throughput Rate | 250 kSPS - enables full 6-channel sampling every 4 µs, sufficient for 50/60 Hz power quality analysis with >4k samples/cycle. |
| SNR @ 10 kHz | 88 dB - ensures <0.004% RMS noise floor relative to full scale, supporting 16-bit effective resolution in narrowband applications. |
| Analog Input Range | ±10 V or ±5 V (pin/software-selectable) - accommodates standard industrial sensor outputs and legacy metering signal levels without external scaling. |
| Reference | On-chip 2.5 V ±10 mV (25 ppm/°C TC) - eliminates external reference component count and drift sensitivity in compact designs. |
| Power Dissipation | 140 mW at 250 kSPS - enables thermal management in dense PCB layouts without forced air or heatsinking. |
| Aperture Jitter | 35 ps - limits sampling uncertainty to <0.02° phase error at 10 kHz, preserving harmonic integrity for FFT-based diagnostics. |
Pinout & Package
AD7656YSTZ-1 is housed in a 64-lead LQFP package (10 mm × 10 mm, 0.5 mm pitch) with exposed pad for thermal enhancement. Pin assignments follow Analog Devices Rev. D datasheet Figure 3 and Table 7.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| V1–V6 | Analog Inputs | Single-ended, high-impedance (±1 µA leakage) inputs supporting ±4×VREF (±10 V) or ±2×VREF (±5 V) ranges via RANGE pin or RNGx bits. |
| CONVST A/B/C | Conversion Start Triggers | Independent TTL/CMOS-compatible inputs initiating simultaneous sampling on ADC pairs (V1/V2, V3/V4, V5/V6) - enables staggered or fully synchronized acquisition. |
| DB0–DB15 | Parallel Data Bus | 16-bit bidirectional bus (DB0 = LSB, DB15 = MSB) with RD/WR control - supports microprocessor interfacing without glue logic. |
| SER/PAR SEL | Interface Mode Select | Hardware-configurable pin selecting parallel (low) or serial (high) mode - simplifies board-level configuration without firmware dependency. |
| REFCAPA/B/C | Reference Decoupling Terminals | Dedicated pins for 1 µF AGND-decoupled capacitors per ADC pair - reduces reference noise coupling between channels. |
| AGND/DGND | Analog & Digital Grounds | 10 dedicated AGND pins and 2 DGND pins - enforce strict separation of analog return paths to minimize digital switching noise injection into ADC front-end. |
Key Features
| Feature | Design Value |
|---|---|
| Simultaneous 6-channel sampling | Three independent CONVST inputs enable deterministic, jitter-free synchronization across all six channels - essential for vector measurements in power analyzers. |
| iCMOS process technology | Enables ±16.5 V analog supply rails with 5 V digital supplies in a single monolithic IC - eliminates level-shifting circuitry and improves system reliability. |
| True bipolar input architecture | Accepts ±10 V or ±5 V directly without external op-amp gain/level-shift stages - reduces BOM cost and signal path error sources. |
| Integrated reference & buffers | On-chip 2.5 V reference with 6 ppm/°C tempco and dedicated REFCAP pins per ADC pair - ensures stable, low-noise conversion across temperature and load variations. |
| Daisy-chain serial interface | Single SCLK/CS/DOUT connection supports cascading multiple AD7656YSTZ-1 devices - scales channel count without increasing host interface pins or FPGA I/O resources. |
Applications
| Power Line Monitoring | Industrial Instrumentation |
|---|---|
Use Scenario: Real-time acquisition of voltage, current, and neutral signals in 3-phase distribution panels for harmonics, flicker, and sag/swell detection. IC Role / Device Role / Timing Role: Simultaneous-sampling ADC capturing six synchronized waveforms with <4 ns aperture delay matching - preserves inter-channel phase relationships critical for vector math. Use Value: Enables IEEE 1459-compliant power quality analysis using a single IC, reducing system latency and eliminating inter-channel skew errors inherent in multiplexed solutions. |
Use Scenario: High-accuracy data logging in portable calibrators and benchtop multimeters requiring traceable DC/AC voltage and current measurements. IC Role / Device Role / Timing Role: 16-bit SAR converter with ±0.35% FSR full-scale error matching and on-chip reference - delivers calibrated accuracy without external trimming or reference calibration. Use Value: Achieves 0.01% basic accuracy over −40°C to +85°C (B version), meeting Class 0.1 instrument standards with minimal external components. |
| Multiaxis Motion Control | Energy Metering Reference Design |
Use Scenario: Closed-loop position feedback in CNC machines and robotic arms using six encoder or resolver analog outputs. IC Role / Device Role / Timing Role: Hardware-triggered simultaneous sampling across three axis pairs (X/Y, Z/U, V/W) via CONVST A/B/C - ensures deterministic motion trajectory reconstruction. Use Value: Eliminates time-skew-induced torque ripple by guaranteeing sub-microsecond inter-channel alignment - improves servo smoothness and positional repeatability. |
Use Scenario: Metrology-grade polyphase energy meter reference platform validating ANSI C12.20 Class 0.2 compliance under dynamic load conditions. IC Role / Device Role / Timing Role: Six-channel ADC digitizing voltage and current transformers with 88 dB SNR and 250 kSPS - captures transient events (e.g., lightning surges) with full spectral fidelity. Use Value: Supports IEC 62053-22 Class 0.2 active/reactive energy calculation with <0.005% RMS error margin, verified across temperature and line frequency variation. |
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 | Same 16-bit resolution and 250 kSPS rate, but requires full decoupling (no reduced-BOM optimization); higher typical power (155 mW vs. 140 mW). | Targeted at legacy designs where pin/software compatibility with original AD7656 is mandatory; lacks AD7656YSTZ-1's optimized decoupling scheme. | Select AD7656YSTZ-1 when minimizing external capacitor count and lowering system power are priorities; choose AD7656BSTZ only for drop-in replacement in existing AD7656 layouts. |
| LTC2326CUH-16 | 16-bit, 250 kSPS, 6-channel simultaneous-sampling ADC, but uses different interface (LVDS/CMOS) and lacks integrated reference; requires external 2.5 V reference. | Designed for high-noise environments (e.g., motor drives) with differential inputs and LVDS output - not pin-compatible and demands revised PCB layout and firmware. | Choose LTC2326CUH-16 only when differential input capability or LVDS noise immunity is required; AD7656YSTZ-1 remains optimal for single-ended, reference-integrated, LQFP-based industrial metering. |
Compared with AD7656BSTZ, AD7656YSTZ-1 reduces decoupling capacitance by ~30% and cuts operational power by 10%, while matching timing and accuracy specs; versus LTC2326CUH-16, it trades differential input flexibility for lower BOM cost, smaller footprint, and simplified reference design - making it superior for cost-sensitive, space-constrained power monitoring applications.
Availability
AD7656YSTZ-1 is available at Aetrix Electronics and suitable for power line monitoring, industrial instrumentation, and multiaxis positioning systems requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for AD7656YSTZ-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.
The AD7656YSTZ-1 belongs to the AD765x-1 family of simultaneous-sampling SAR ADCs, engineered specifically for industrial power quality, energy metering, and precision test equipment where channel coherence, bipolar input handling, and integrated reference stability are critical.
FAQ
What is the maximum analog input voltage range supported by the AD7656YSTZ-1?
The AD7656YSTZ-1 supports two pin- or software-selectable bipolar input ranges: ±4 × VREF (±10 V with internal 2.5 V reference) and ±2 × VREF (±5 V). These ranges are set via the RANGE pin or RNGx bits in the control register. Operation requires corresponding VDD/VSS supplies: ±10 V to ±16.5 V for ±10 V range, or +5 V to +16.5 V and −5 V to −16.5 V for ±5 V range - as specified in Table 1 of the Rev. D datasheet.
Does the AD7656YSTZ-1 include an internal voltage reference?
Yes, the AD7656YSTZ-1 integrates a 2.5 V reference with ±10 mV initial accuracy, 25 ppm/°C temperature coefficient (6 ppm/°C typical), and 150 ppm long-term stability over 1000 hours. It also provides dedicated REFCAPA/B/C pins for decoupling each ADC pair's reference buffer with 1 µF capacitors to AGND - ensuring low-noise, stable reference performance across all six channels.
How does the AD7656YSTZ-1 achieve simultaneous sampling across six channels?
The AD7656YSTZ-1 uses three independent CONVST inputs (CONVST A, B, C) to trigger simultaneous sampling on three ADC pairs: CONVST A controls V1/V2, CONVST B controls V3/V4, and CONVST C controls V5/V6. Each CONVST edge initiates track-to-hold transition with <4 ns aperture delay matching between channels in a pair - enabling true simultaneous acquisition without time skew, critical for vector-based power calculations.
What interface options does the AD7656YSTZ-1 support?
The AD7656YSTZ-1 supports high-speed parallel (16-bit bidirectional bus with RD/WR/CS), serial (SPI/QSPI/MICROWIRE/DSP-compatible), and daisy-chain modes. Interface selection is controlled by the SER/PAR SEL pin. In serial mode, multiple AD7656YSTZ-1 devices can share one SCLK/CS bus via daisy-chain configuration - reducing host controller pin count while maintaining full 6-channel-per-device throughput.
What is the power consumption of the AD7656YSTZ-1 during active conversion?
The AD7656YSTZ-1 consumes 140 mW at 250 kSPS with AVCC = DVCC = VDRIVE = +5.25 V, VDD = +16.5 V, and VSS = −16.5 V - comprising 26 mA total supply current. It offers partial and full power-down modes: partial mode draws 40 mW (7 mA), and full standby (STBY pin asserted) draws just 315 µW - enabling dynamic power scaling in battery-backed or thermally constrained applications.
AD7656YSTZ-1 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-1 FAQ
1.How can I place an order for AD7656YSTZ-1 through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7656YSTZ-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 AD7656YSTZ-1 reliable?
The price and inventory of AD7656YSTZ-1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7656YSTZ-1 is usually 5 days.
3.What payment methods are accepted for AD7656YSTZ-1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7656YSTZ-1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7656YSTZ-1?
AD7656YSTZ-1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7656YSTZ-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 AD7656YSTZ-1?
For technical support, including AD7656YSTZ-1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7656YSTZ-1 requirements.
6.How does Aetrix verify that AD7656YSTZ-1 is sourced from the original manufacturer or authorized distributors?
All AD7656YSTZ-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 AD7656YSTZ-1 meets industry standards.
7.What is the process for return or replacement of AD7656YSTZ-1?
All AD7656YSTZ-1 units undergo pre-shipment inspection (PSI). If there is an issue with AD7656YSTZ-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 AD7656YSTZ-1 part is unused and in its original packaging.
Return procedure for AD7656YSTZ-1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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