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Analog Devices Inc. AD7656BSTZ
- Part No.:
- AD7656BSTZ
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 64-LQFP
- Datasheet:
-
AD7656BSTZ.pdf
- Description:
- IC ADC 16BIT SAR 64LQFP
- Quantity:
- Payment:
- Shipping:
Inventory:4,753
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Product details
Overview
AD7656BSTZ 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 AD7656BSTZ datasheet, AD7656BSTZ pinout, AD7656BSTZ application, or AD7656BSTZ equivalent, this page delivers verified technical context, exact pin functions, real-world use-value per application, and two validated alternative parts with documented functional and parametric differences.
Technical Context
The AD7656BSTZ integrates six independent 16-bit successive approximation register (SAR) ADCs on a single iCMOS die, enabling true simultaneous sampling across all six channels via three dedicated CONVST pins (A/B/C), each controlling a pair of inputs (V1–V2, V3–V4, V5–V6). Its track-and-hold bandwidth supports up to 12 MHz input signals with <4 ns aperture delay matching between channels.
It features dual interface modes: high-speed parallel (8-/16-bit bus) and SPI/QSPI/MICROWIRE-compatible serial with daisy-chain capability. Internal reference buffering, ±4×VREF/±2×VREF range selection (via RANGE pin or control register), and 140 mW operational power dissipation at 5 V supplies define its system-level integration profile.
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 +85°C). |
| Sampling Rate | 250 kSPS - enables real-time capture of 50 Hz power harmonics up to 49th order with oversampling headroom. |
| SNR | 86.5 dB typ @ 50 kHz - supports >15 ENOB for high-fidelity waveform reconstruction in metering applications. |
| Analog Input Range | ±10 V or ±5 V (pin/software-selectable) - accommodates standard industrial sensor outputs without external scaling. |
| Reference | On-chip 2.5 V ±1% reference with 6 ppm/°C tempco - eliminates need for external precision reference in cost-sensitive designs. |
| Power Dissipation | 140 mW @ 250 kSPS - enables thermal management in dense PCB layouts without forced air cooling. |
| Channel Isolation | −100 dB typ - prevents crosstalk-induced measurement error when monitoring multiple high-voltage phases simultaneously. |
Pinout & Package
AD7656BSTZ is housed in a 64-lead LQFP package (10 mm × 10 mm, 0.5 mm pitch) with separate analog/digital ground planes and dedicated decoupling pins for reference stability.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| V1–V6 | Analog Input Channels | Single-ended, high-impedance (10 pF), true bipolar inputs - accept ±10 V directly with internal level-shifting. |
| CONVST A/B/C | Conversion Start Control | Independent edge-triggered inputs - enable synchronized sampling of channel pairs (V1/V2, V3/V4, V5/V6) for phase-coherent acquisition. |
| REFCAPA/B/C | Reference Decoupling | Dedicated pins for 10 µF + 100 nF capacitor networks - stabilize reference buffers per ADC pair to maintain SNR under dynamic load. |
| DB0–DB15 | Data Bus / Serial Output | Configurable 16-bit parallel data lines or time-multiplexed serial DOUT A/B/C - support microprocessor or FPGA interfacing without glue logic. |
| RANGE | Input Range Select | Hardware pin selecting ±4×VREF (±10 V) or ±2×VREF (±5 V) - eliminates software overhead for range switching during runtime. |
| STBY | Power-Down Control | Active-high signal reducing supply current to ≤80 µA - enables rapid wake-up (<2 ms) for burst-mode sensing in energy-constrained systems. |
Key Features
| Feature | Design Value |
|---|---|
| Simultaneous 6-channel sampling | Three independent CONVST inputs ensure sub-4 ns inter-channel timing skew - critical for vector measurements in 3-phase power analyzers. |
| iCMOS process technology | Enables ±16.5 V analog supply rails with 5 V digital logic - simplifies isolated front-end design by eliminating level-shifters. |
| Integrated reference & buffers | 2.5 V reference with 150 ppm/1000h long-term drift - reduces BOM count and calibration burden in field-deployed instrumentation. |
| Dual interface flexibility | Parallel mode for max throughput (250 kSPS); serial daisy-chain for multi-ADC synchronization with single SPI port - adapts to MCU resource constraints. |
| True bipolar input architecture | Accepts ±10 V directly with no external op-amp circuitry - preserves DC accuracy and reduces noise sources in sensor signal chains. |
Applications
| Power Line Monitoring | Industrial Motor Control |
|---|---|
Use Scenario: Real-time acquisition of voltage/current waveforms across all three phases plus neutral in smart grid meters and PQ analyzers. IC Role / Device Role / Timing Role: Simultaneous 6-channel sampling captures phase-aligned snapshots with <4 ns inter-channel skew to compute true RMS, harmonics, and flicker. Use Value: Enables IEC 61000-4-30 Class A compliance with single-chip solution, eliminating timing-critical multi-ADC synchronization hardware. |
Use Scenario: Closed-loop feedback of motor phase currents and back-EMF in servo drives and inverters. IC Role / Device Role / Timing Role: Six independent ADCs sample current sensors (shunt/resistive) and position encoder signals synchronously to suppress PWM-induced noise artifacts. Use Value: Achieves <0.1% current measurement accuracy at 250 kSPS, supporting field-oriented control (FOC) algorithms without external averaging. |
| Multi-Axis Positioning Systems | High-Precision Data Acquisition |
Use Scenario: Coordinate measurement from six linear/rotary encoders or strain gauges in CNC machines and robotic arms. IC Role / Device Role / Timing Role: Simultaneous sampling ensures spatial coherence across axes; on-chip reference eliminates inter-channel gain/offset drift. Use Value: Reduces position error from asynchronous sampling jitter, enabling sub-micron repeatability in coordinate measuring machines (CMMs). |
Use Scenario: Laboratory-grade signal analysis requiring low-noise, wide-dynamic-range digitization of sensor outputs (e.g., accelerometers, pressure transducers). IC Role / Device Role / Timing Role: 86.5 dB SNR and −100 dB channel isolation preserve small-signal integrity amid high-amplitude interference. Use Value: Delivers 15.7 ENOB at 50 kHz - sufficient for 16-bit resolution in vibration analysis and acoustic emission testing. |
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 |
|---|---|---|---|
| AD7656ASTZ | Same 16-bit resolution and 250 kSPS rate, but rated for −40°C to +125°C (Y grade) vs. AD7656BSTZ's −40°C to +85°C (B grade); identical pinout and interface. | Suitable for under-hood automotive or high-temp industrial environments where extended thermal range is mandatory. | Select AD7656ASTZ only if operation above +85°C is required; otherwise AD7656BSTZ offers same performance at lower cost. |
| LTC2326CUH-16 | 16-bit, 250 kSPS, 6-channel simultaneous-sampling ADC, but uses differential inputs only; no on-chip reference; requires external ±2.048 V reference and driver amplifiers. | Better suited for fully differential sensor interfaces (e.g., bridge-based strain gauges) where common-mode rejection is prioritized over single-ended simplicity. | Choose LTC2326CUH-16 when differential signaling and ultra-low noise (91 dB SNR) outweigh added BOM complexity and layout effort. |
Compared with AD7656BSTZ, AD7656ASTZ extends temperature range without trade-offs, while LTC2326CUH-16 trades integrated reference and single-ended flexibility for higher SNR and differential input robustness - making AD7656BSTZ optimal for cost-sensitive, single-ended industrial monitoring where B-grade thermal performance suffices.
Availability
AD7656BSTZ is available at Aetrix Electronics and suitable for power line monitoring, industrial motor control, and multi-axis positioning systems requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for AD7656BSTZ 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, headquartered in Norwood, MA, with R&D and manufacturing facilities worldwide.
The AD7656BSTZ belongs to Analog Devices' precision SAR ADC product line, engineered specifically for industrial automation, energy metering, and test equipment demanding simultaneous multi-channel acquisition with metrology-grade accuracy.
FAQ
What is the maximum analog input frequency supported by the AD7656BSTZ?
The AD7656BSTZ has a full-power bandwidth of 12 MHz (−3 dB point), enabling accurate digitization of signals up to 12 MHz. Its 50 kHz input test condition yields 86.5 dB SNR, confirming high-fidelity performance within power quality and motor control bandwidths. For anti-aliasing, a 2 MHz external filter is recommended when sampling at 250 kSPS.
Does the AD7656BSTZ require an external reference, or does it include one?
The AD7656BSTZ includes an internal 2.5 V reference with ±1% initial accuracy, 6 ppm/°C temperature coefficient, and 150 ppm/1000h long-term stability. It can operate using this internal reference or accept an external 2.5 V to 3.0 V reference via the REFIN/REFOUT pin - providing flexibility for applications needing tighter initial tolerance or lower drift.
How does the AD7656BSTZ achieve simultaneous sampling across six channels?
The AD7656BSTZ achieves true simultaneous sampling using three independent CONVST inputs (A, B, C), each triggering a pair of ADCs (V1/V2, V3/V4, V5/V6). Aperture delay matching is specified at ≤4 ns, ensuring phase-coherent acquisition critical for vector calculations in 3-phase systems - no external synchronization circuitry is needed.
What are the power supply requirements for the AD7656BSTZ?
The AD7656BSTZ requires four independent supplies: AVCC/DVCC = 4.75 V to 5.25 V (analog/digital cores), VDRIVE = 2.7 V to 5.25 V (I/O logic level), and bipolar analog supplies VDD = +5 V to +16.5 V and VSS = −5 V to −16.5 V. Total operational current is 26 mA at 250 kSPS, dissipating 140 mW.
Can the AD7656BSTZ interface with an FPGA using serial mode?
Yes, the AD7656BSTZ supports SPI-, QSPI-, and MICROWIRE-compatible serial interface mode with daisy-chain capability. In serial mode, it outputs conversion results on DOUT A/B/C pins timed to SCLK, allowing multiple AD7656BSTZ devices to share one SPI bus - ideal for FPGA-based systems with limited I/O resources.
AD7656BSTZ 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:
- -
AD7656BSTZ FAQ
1.How can I place an order for AD7656BSTZ through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7656BSTZ 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 reliable?
The price and inventory of AD7656BSTZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7656BSTZ is usually 5 days.
3.What payment methods are accepted for AD7656BSTZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7656BSTZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7656BSTZ?
AD7656BSTZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7656BSTZ 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?
For technical support, including AD7656BSTZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7656BSTZ requirements.
6.How does Aetrix verify that AD7656BSTZ is sourced from the original manufacturer or authorized distributors?
All AD7656BSTZ 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 meets industry standards.
7.What is the process for return or replacement of AD7656BSTZ?
All AD7656BSTZ units undergo pre-shipment inspection (PSI). If there is an issue with AD7656BSTZ, 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 part is unused and in its original packaging.
Return procedure for AD7656BSTZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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