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Analog Devices Inc. AD7656BSTZ-REEL
- Part No.:
- AD7656BSTZ-REEL
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 64-LQFP
- Datasheet:
-
AD7656BSTZ-REEL.pdf
- Description:
- IC ADC 16BIT SAR 64LQFP
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
AD7656BSTZ-REEL 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 integrated 2.5 V reference - deployed in power line monitoring systems for synchronized voltage/current phasor capture.
For engineers reviewing the AD7656BSTZ-REEL datasheet, AD7656BSTZ-REEL pinout, AD7656BSTZ-REEL application, or AD7656BSTZ-REEL equivalent, key selection criteria include simultaneous sampling accuracy across six channels, iCMOS-based high-voltage analog input tolerance (±16.5 V), low 140 mW operational power, and SPI/parallel/daisy-chain interface flexibility.
Technical Context
The AD7656BSTZ-REEL implements six independent 16-bit successive approximation register (SAR) cores on a single iCMOS die, enabling true simultaneous sampling via three dedicated CONVST pins (A/B/C) that trigger paired channels (V1/V2, V3/V4, V5/V6). Its track-and-hold supports 12 MHz full-power bandwidth and <4 ns aperture delay matching between channels.
It integrates on-chip reference buffers and accepts external 2.5 V/3 V references while delivering 2.49–2.51 V output; logic interface operates at 2.7–5.25 V (VDRIVE), with parallel, serial (SPI/QSPI/MICROWIRE/DSP-compatible), and daisy-chain modes - all supporting 250 kSPS sustained throughput in parallel mode.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 16-bit - guarantees monotonicity and no missing codes over full temperature range. |
| Sampling Rate | 250 kSPS - maximum sustained throughput in parallel interface mode with full 16-bit accuracy. |
| SNR | 86.5 dB at 50 kHz - enables >13.5 effective number of bits (ENOB) for precision AC signal acquisition. |
| Analog Input Range | ±10 V or ±5 V (pin/software-selectable) - supports direct connection to industrial sensor outputs without external scaling. |
| Reference | Integrated 2.5 V ±0.5% reference with 6 ppm/°C tempco - eliminates need for external reference in cost-sensitive designs. |
| Power Dissipation | 140 mW at 250 kSPS - achieved via iCMOS process enabling high-voltage operation with low quiescent current. |
| Channel Isolation | −100 dB - prevents crosstalk between simultaneously sampled channels up to 100 kHz. |
Pinout & Package
AD7656BSTZ-REEL is housed in a 64-lead LQFP (10 mm × 10 mm, 0.5 mm pitch) with separate analog/digital ground planes and dedicated decoupling pins for reference buffers.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| V1–V6 | Analog Input Channels | Six single-ended, high-impedance (±1 µA leakage), true bipolar inputs supporting ±4×VREF (±10 V) or ±2×VREF (±5 V) ranges. |
| CONVST A/B/C | Conversion Start Control | Three independent TTL/CMOS-compatible inputs initiating simultaneous sampling on channel pairs (V1/V2, V3/V4, V5/V6). |
| REFCAPA/B/C | Reference Buffer Decoupling | Three dedicated pins requiring 10 µF + 100 nF AGND decoupling per ADC pair to stabilize internal reference buffers. |
| DB0–DB15 | Parallel Data Bus | 16-bit bidirectional data bus supporting multiplexed read/write; DB0–DB2 also serve as channel select lines in software mode. |
| CS/RD/WR | Parallel Interface Control | Standard microprocessor-style control: chip select, read strobe, write strobe - compatible with 8086/8051 timing. |
| SCLK/DOUT A/B/C | Serial Interface Signals | High-speed SPI-compatible interface with three independent DOUT lines enabling concurrent readout of three ADC pairs. |
| AGND/DGND | Ground Separation | 11 AGND and 2 DGND pins - must be tied at single point with ≤0.3 V potential difference to maintain DC accuracy and noise immunity. |
Key Features
| Feature | Design Value |
|---|---|
| Simultaneous Sampling Architecture | Six independent SAR cores with matched aperture delay (<4 ns) enable phase-coherent multi-channel acquisition for power quality analysis. |
| iCMOS Process Technology | Enables ±16.5 V analog supply rails (VDD/VSS) and true bipolar input operation in compact LQFP package - no external level-shifting required. |
| Flexible Interface Modes | Hardware-selectable parallel/serial/daisy-chain operation allows integration with legacy microcontrollers or modern FPGAs without protocol translation. |
| On-Chip Reference System | 2.5 V reference with 6 ppm/°C drift and 150 ppm long-term stability reduces BOM count and improves system-level temperature drift performance. |
| Low-Power Standby Mode | 100 µW max standby consumption (via STBY pin) enables rapid wake-up (<2 ms) for event-triggered sampling in energy-constrained applications. |
Applications
| Power Line Monitoring | Industrial Motor Control |
|---|---|
|
Use Scenario: Real-time measurement of voltage, current, and harmonic content across three-phase AC distribution networks. IC Role / Device Role / Timing Role: Simultaneous sampling of six analog inputs (3× voltage + 3× current) preserves phase relationships for accurate phasor calculation and fault detection. Use Value: 86.5 dB SNR and −100 dB channel isolation ensure sub-0.1% fundamental amplitude error and reliable THD estimation under noisy grid conditions. |
Use Scenario: Closed-loop position and torque feedback in servo drives using resolver or encoder analog outputs. IC Role / Device Role / Timing Role: Synchronized acquisition of motor phase currents and back-EMF signals for field-oriented control (FOC) algorithms. Use Value: 250 kSPS throughput and <4 ns inter-channel aperture matching enable precise current vector reconstruction at 20 kHz PWM frequencies. |
| Multi-Axis Motion Systems | Test & Measurement Equipment |
|
Use Scenario: High-fidelity data capture from strain gauges, accelerometers, and LVDTs in CNC machine tool vibration analysis. IC Role / Device Role / Timing Role: Simultaneous digitization of six mechanical sensing channels to correlate spatial dynamics and detect resonance modes. Use Value: 12 MHz full-power bandwidth supports anti-aliasing filter design for broadband mechanical signals up to 5 MHz. |
Use Scenario: Modular data acquisition modules for automated test equipment requiring calibrated multi-channel analog front-ends. IC Role / Device Role / Timing Role: Precision ADC subsystem with integrated reference and flexible digital interface for plug-in DAQ card architectures. Use Value: Pin/software-selectable ±10 V/±5 V ranges and 16-bit resolution eliminate external gain switching, reducing calibration complexity and test time. |
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 |
|---|---|---|---|
| AD7657BSTZ-REEL | 14-bit resolution, 81.5 dB SINAD min, identical pinout and interface - lower DC accuracy but reduced cost and power (140 mW → 140 mW same, but lower dynamic range). | Acceptable where 14-bit ENOB suffices (e.g., motor current monitoring without harmonic analysis). | Select AD7657BSTZ-REEL when system SNR requirements are ≤82 dB and cost optimization is prioritized over phase-coherent wideband fidelity. |
| AD7658BSTZ-REEL | 12-bit resolution, 73 dB SINAD min, same package and timing - optimized for higher throughput density rather than precision. | Suitable for high-channel-count, lower-accuracy applications like basic PLC I/O modules. | Choose AD7658BSTZ-REEL only when 12-bit resolution meets system linearity specs and simultaneous sampling of >4 channels is mandatory within space-constrained layouts. |
Compared with AD7656BSTZ-REEL, AD7657BSTZ-REEL trades 2-bit resolution for identical packaging and interface compatibility, while AD7658BSTZ-REEL further reduces resolution to 12 bits for cost-sensitive, high-volume industrial I/O - neither offers the 16-bit simultaneous fidelity required for IEEE 1159-compliant power quality analyzers.
Availability
AD7656BSTZ-REEL is available at Aetrix Electronics and suitable for power line monitoring, industrial motor control, and multi-axis motion systems requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for AD7656BSTZ-REEL 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, founded in 1965 and headquartered in Wilmington, MA.
The AD7656BSTZ-REEL belongs to Analog Devices' precision SAR ADC product line, engineered specifically for industrial automation and energy infrastructure applications demanding synchronized multi-channel acquisition with metrology-grade accuracy.
FAQ
What is the maximum sampling rate of the AD7656BSTZ-REEL?
The AD7656BSTZ-REEL achieves a maximum sustained throughput rate of 250 kSPS in parallel interface mode. This rate applies to all six channels operating simultaneously with full 16-bit resolution and specified AC/DC performance. Serial interface modes may reduce effective throughput due to data serialization overhead, but the core conversion engine remains capable of 250 kSPS per channel pair.
Does the AD7656BSTZ-REEL require an external reference?
No, the AD7656BSTZ-REEL 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. It can operate using this internal reference or accept an external 2.5 V/3 V source via the REFIN/REFOUT pin - eliminating external reference components in most applications unless tighter initial accuracy or lower drift is required.
How does the AD7656BSTZ-REEL support simultaneous sampling across six channels?
The AD7656BSTZ-REEL uses three dedicated CONVST inputs (A, B, C) to initiate conversions on three independent ADC pairs: CONVST A triggers V1/V2, CONVST B triggers V3/V4, and CONVST C triggers V5/V6. All six channels sample at the exact same instant, with aperture delay matching ≤4 ns - preserving phase coherence critical for power system phasor measurement units (PMUs) and motor control.
What package type and thermal characteristics does the AD7656BSTZ-REEL have?
The AD7656BSTZ-REEL is supplied in a 64-lead LQFP package (10 mm × 10 mm, 0.5 mm pitch) with θJA = 45°C/W and θJC = 11°C/W. Its iCMOS process enables efficient thermal dissipation at 140 mW operational power, and the package supports standard lead-free reflow profiles up to 260°C - verified for industrial temperature range (−40°C to +85°C, B grade).
Can the AD7656BSTZ-REEL interface directly with an FPGA or DSP?
Yes, the AD7656BSTZ-REEL supports direct interfacing with FPGAs and DSPs via its high-speed parallel or serial interfaces. The parallel mode is compatible with 8086/8051 timing, while the serial interface is SPI/QSPI/MICROWIRE/DSP-compatible with daisy-chain capability - allowing multiple AD7656BSTZ-REEL devices to share one serial bus without additional glue logic.
AD7656BSTZ-REEL 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:
- 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 ~ 85°C
- Supplier Device Package:
- 64-LQFP (10x10)
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
AD7656BSTZ-REEL FAQ
1.How can I place an order for AD7656BSTZ-REEL through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7656BSTZ-REEL 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 AD7656BSTZ-REEL reliable?
The price and inventory of AD7656BSTZ-REEL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7656BSTZ-REEL is usually 5 days.
3.What payment methods are accepted for AD7656BSTZ-REEL?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7656BSTZ-REEL transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7656BSTZ-REEL?
AD7656BSTZ-REEL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7656BSTZ-REEL 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 AD7656BSTZ-REEL?
For technical support, including AD7656BSTZ-REEL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7656BSTZ-REEL requirements.
6.How does Aetrix verify that AD7656BSTZ-REEL is sourced from the original manufacturer or authorized distributors?
All AD7656BSTZ-REEL 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 AD7656BSTZ-REEL meets industry standards.
7.What is the process for return or replacement of AD7656BSTZ-REEL?
All AD7656BSTZ-REEL units undergo pre-shipment inspection (PSI). If there is an issue with AD7656BSTZ-REEL, 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 AD7656BSTZ-REEL part is unused and in its original packaging.
Return procedure for AD7656BSTZ-REEL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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