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Analog Devices Inc. AD7656A-1BSTZ
- Part No.:
- AD7656A-1BSTZ
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 64-LQFP
- Datasheet:
-
AD7656A-1BSTZ.pdf
- Description:
- IC ADC 16BIT SAR 64LQFP
- Quantity:
- Payment:
- Shipping:
Inventory:3,794
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Product details
Overview
AD7656A-1BSTZ from Analog Devices is a 6-channel, simultaneous-sampling, 16-bit SAR 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 monitoring and multiaxis control systems.
For engineers reviewing the AD7656A-1BSTZ datasheet, AD7656A-1BSTZ pinout, AD7656A-1BSTZ application, or AD7656A-1BSTZ equivalent, key selection factors include simultaneous sampling across six independent ADCs, iCMOS® process enabling ±16.5 V analog supply operation, 88 dB SNR at 10 kHz, daisy-chain serial interface support, and built-in power supply sequencing robustness.
Technical Context
The AD7656A-1BSTZ integrates six independent 16-bit successive approximation register (SAR) ADCs on a single iCMOS® die, each with dedicated track-and-hold amplifiers supporting up to 4.5 MHz full-power bandwidth and 4 ns aperture delay matching. It uses an internal oscillator and three CONVST pins (A/B/C) to enable independent, simultaneous sampling of three ADC pairs (V1/V2, V3/V4, V5/V6).
It supports dual interface modes: high-speed parallel (16-bit data bus, RD/WR/CS control) and flexible serial (SPI/QSPI/MICROWIRE/DSP-compatible), including daisy-chain mode with configurable DOUT A/B/C outputs. Input range is selected via hardware (RANGE pin) or software (RNGx bits), and reference can be internal 2.5 V or external.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 16-bit - guarantees monotonic output with no missing codes over full temperature range. |
| Throughput Rate | 250 kSPS - enables real-time capture of fast transients in power line monitoring (e.g., cycle-by-cycle waveform analysis). |
| SNR @ 10 kHz | 88 dB - delivers high dynamic range for precision measurement of low-amplitude harmonics in industrial instrumentation. |
| Analog Input Range | ±10 V or ±5 V (pin/software-selectable) - supports direct connection to standard industrial sensor outputs without external scaling. |
| Reference | On-chip 2.5 V ±0.8% FSR - eliminates need for external reference IC, reducing BOM count and layout complexity. |
| Power Dissipation | 140 mW at 250 kSPS - enables dense multi-channel data acquisition in thermally constrained embedded systems. |
| Aperture Matching | 4 ns - ensures sub-degree phase alignment across all six channels for accurate vector measurements in motor control. |
Pinout & Package
AD7656A-1BSTZ is housed in a 64-lead LQFP package (10 mm × 10 mm, 0.5 mm pitch) with separate analog (AGND) and digital (DGND) ground planes, dual supply domains (VDD/VSS for analog, AVCC/DVCC/VDRIVE for logic), and dedicated reference decoupling pins (REFCAPA/B/C).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| V1–V6 | Analog Input Channels | Single-ended, high-impedance inputs supporting true bipolar operation; each pair (V1/V2, etc.) shares a dedicated track-and-hold and conversion timing. |
| CONVST A/B/C | Conversion Start Control | Independent hardware triggers enabling synchronized sampling of three ADC pairs - critical for time-aligned multichannel acquisition. |
| DB0–DB15 | Parallel Data Bus | 16-bit bidirectional bus for read/write access; supports byte-mode (W/B = 1) and word-mode (W/B = 0) transfers with HBEN-controlled MSB/LSB ordering. |
| SER/PAR SEL | Interface Mode Select | Logic-level control to switch between parallel (low) and serial (high) interface - allows reuse of PCB footprint across system variants. |
| REFIN/REFOUT | Reference I/O | Configurable as 2.5 V output (internal ref enabled) or input (external ref applied); requires ≥1 µF decoupling to AGND for stability. |
| STBY | Global Power-Down | Active-low signal reducing total current to ≤60 µA - enables ultra-low-power sleep states in battery-backed monitoring systems. |
Key Features
| Feature | Design Value |
|---|---|
| Simultaneous Sampling | Six independent ADCs with matched aperture delay (≤4 ns) - preserves phase coherence across all channels for FFT-based power quality analysis. |
| iCMOS® Process | Enables ±16.5 V analog supplies on a CMOS-compatible die - eliminates need for discrete level-shifting or isolated supplies in high-voltage industrial interfaces. |
| Daisy-Chain Serial Interface | Supports cascading multiple AD7656A-1BSTZ devices on one SPI bus using DCIN/DCEN pins - reduces host GPIO count and simplifies synchronization in modular DAQ systems. |
| Built-in Power Sequencing Robustness | Hardware tolerance for non-simultaneous VDD/VSS ramp-up (VDD before VSS required) - improves reliability in complex power supply architectures without external sequencing ICs. |
| Reduced Decoupling Requirements | Fewer external capacitors vs. AD7656A - lowers board area, BOM cost, and assembly risk while maintaining noise performance (88 dB SNR). |
Applications
| Power Line Monitoring | Industrial Instrumentation |
|---|---|
Use Scenario: Real-time acquisition of voltage/current waveforms across three-phase distribution panels with harmonic distortion analysis. IC Role / Device Role / Timing Role: Simultaneous 6-channel sampling captures synchronized line-to-line and line-to-neutral signals for vector computation and IEEE 519 compliance checking. Use Value: 4 ns channel-to-channel aperture matching ensures <0.1° phase error at 50/60 Hz - critical for accurate reactive power and THD calculation. |
Use Scenario: High-precision sensor data logging in programmable logic controller (PLC) analog input modules. IC Role / Device Role / Timing Role: Six independent ADCs digitize temperature, pressure, flow, and position sensors concurrently, feeding FPGA or ARM-based processing cores. Use Value: On-chip 2.5 V reference and ±10 V input range eliminate external signal conditioning - reducing component count and calibration drift over temperature. |
| Multiaxis Motion Control | Energy Metering |
Use Scenario: Closed-loop feedback acquisition for servo drives controlling X/Y/Z axes plus auxiliary sensors (torque, vibration). IC Role / Device Role / Timing Role: Hardware-triggered CONVST A/B/C pulses synchronize sampling across motor phase currents and encoder signals for field-oriented control (FOC). Use Value: 250 kSPS throughput enables >10 kHz current loop update rates - meeting IEC 61800-3 requirements for high-dynamic servo response. |
Use Scenario: Revenue-grade polyphase energy meter with anti-tampering diagnostics and waveform recording. IC Role / Device Role / Timing Role: Simultaneous sampling of voltage and current per phase (6 channels total) feeds metrology DSP for active/reactive power, RMS, and sag/swell detection. Use Value: 88 dB SNR at 10 kHz supports Class 0.2 accuracy per IEC 62053-22 - validated under noisy industrial EMI conditions. |
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 | Higher decoupling capacitor count required; identical pinout, timing, and core specs but lacks reduced-decoupling optimization. | Same functional scope but higher BOM cost and layout area due to additional external caps. | Select when legacy compatibility with AD7656 design files is mandatory and board space permits extra decoupling. |
| LTC2358-16IUKG#PBF | 8-channel, 16-bit, 1.5 MSPS; uses different architecture (no internal reference; requires external REF), higher power (240 mW), and QFN-48 package. | Better throughput and channel count but lacks true bipolar input and integrated reference - needs external op-amp front-end for ±10 V. | Select when higher sample rate or more channels are needed and system can accommodate external reference and signal conditioning. |
Compared with AD7656BSTZ, the AD7656A-1BSTZ offers lower bill-of-materials cost and simplified layout via reduced decoupling; compared with LTC2358-16IUKG#PBF, it provides integrated bipolar input handling and on-chip reference at the expense of lower maximum throughput and fewer channels.
Availability
AD7656A-1BSTZ 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 traceable sourcing.
Supply support for AD7656A-1BSTZ 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 AD7656A-1BSTZ belongs to Analog Devices' precision data acquisition portfolio, engineered specifically for high-channel-count, simultaneous-sampling applications where phase coherence, bipolar input capability, and system-level integration reduce design complexity.
FAQ
What is the maximum analog input frequency supported by the AD7656A-1BSTZ?
The AD7656A-1BSTZ supports a full-power bandwidth of 4.5 MHz at −3 dB and 2.2 MHz at −0.1 dB. Its track-and-hold amplifier is optimized for input signals up to 4.5 MHz, enabling accurate digitization of fast transients in power electronics and ultrasonic sensing applications. This specification is confirmed in the Dynamic Performance section of the official datasheet (Rev. 0, Page 3).
Does the AD7656A-1BSTZ require external decoupling capacitors on its reference pins?
Yes - the AD7656A-1BSTZ requires ≥1 µF ceramic decoupling capacitors on each of REFCAPA, REFCAPB, and REFCAPC pins to AGND, and a ≥1 µF capacitor on REFIN/REFOUT to AGND when using the internal reference. These are mandatory for stable reference buffer operation and achieving specified SNR and THD performance, as detailed in the Pin Configuration section (Page 7) and Layout guidelines (Page 24).
Can the AD7656A-1BSTZ operate with only a single positive analog supply?
No - the AD7656A-1BSTZ requires dual analog supplies: VDD (positive, +6 V to +16.5 V) and VSS (negative, −6 V to −16.5 V) to support true bipolar input ranges (±10 V or ±5 V). The absolute maximum ratings specify VDD to AGND and VSS to AGND limits, and operation with only VDD violates the device's iCMOS® architecture. This is explicitly stated in the Power Requirements table (Page 4) and Absolute Maximum Ratings (Page 6).
How does the AD7656A-1BSTZ handle power supply sequencing during startup?
The AD7656A-1BSTZ mandates simultaneous application of VDD and VSS for guaranteed reliability. If not possible, VDD must power up before VSS. Applying negative voltage to analog inputs before VDD/VSS are fully established requires a 560 Ω series resistor on each input. This sequencing behavior is documented in the Power Supply Sequencing section (Page 6) and reflects built-in robustness - not optional design guidance.
Is the AD7656A-1BSTZ pin-compatible with the AD7656A?
Yes - the AD7656A-1BSTZ is explicitly described in the datasheet as "pin and software compatible with the AD7656A" (Features section, Page 1), with identical 64-lead LQFP footprint, pin functions, register map, and timing. The primary differentiation is reduced decoupling requirements, not mechanical or logical incompatibility - making it a drop-in replacement in existing AD7656A designs.
AD7656A-1BSTZ 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 ~ 85°C
- Supplier Device Package:
- 64-LQFP (10x10)
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
AD7656A-1BSTZ FAQ
1.How can I place an order for AD7656A-1BSTZ through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7656A-1BSTZ 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 AD7656A-1BSTZ reliable?
The price and inventory of AD7656A-1BSTZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7656A-1BSTZ is usually 5 days.
3.What payment methods are accepted for AD7656A-1BSTZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7656A-1BSTZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7656A-1BSTZ?
AD7656A-1BSTZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7656A-1BSTZ 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 AD7656A-1BSTZ?
For technical support, including AD7656A-1BSTZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7656A-1BSTZ requirements.
6.How does Aetrix verify that AD7656A-1BSTZ is sourced from the original manufacturer or authorized distributors?
All AD7656A-1BSTZ 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 AD7656A-1BSTZ meets industry standards.
7.What is the process for return or replacement of AD7656A-1BSTZ?
All AD7656A-1BSTZ units undergo pre-shipment inspection (PSI). If there is an issue with AD7656A-1BSTZ, 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 AD7656A-1BSTZ part is unused and in its original packaging.
Return procedure for AD7656A-1BSTZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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