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Analog Devices Inc. AD7657BSTZ
- Part No.:
- AD7657BSTZ
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 64-LQFP
- Datasheet:
-
AD7657BSTZ.pdf
- Description:
- IC ADC 14BIT SAR 64LQFP
- Quantity:
- Payment:
- Shipping:
Inventory:138
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Product details
Overview
AD7657BSTZ from Analog Devices is a 14-bit, 6-channel, simultaneous-sampling SAR ADC with true bipolar ±10 V/±5 V input ranges, 250 kSPS throughput, and integrated 2.5 V reference-designed for high-accuracy power line monitoring and multi-axis industrial control systems.
For engineers reviewing the AD7657BSTZ datasheet, AD7657BSTZ pinout, AD7657BSTZ application, or AD7657BSTZ equivalent, this page delivers verified specifications, validated pin functions, confirmed interface modes (parallel/serial/daisy-chain), and real-world timing and accuracy data per Rev. D datasheet.
Technical Context
The AD7657BSTZ implements six independent 14-bit successive approximation register (SAR) cores on a single iCMOS die, enabling simultaneous sampling across three ADC pairs via dedicated CONVST A/B/C pins. Its track-and-hold supports 12 MHz full-power bandwidth and achieves 82.5 dB SNR at 50 kHz input frequency.
It integrates on-chip reference buffers and supports ±4 × VREF (±10 V) and ±2 × VREF (±5 V) input ranges via hardware (RANGE pin) or software (RNG bits) selection. The device operates with AVCC/DVCC = 4.75–5.25 V, VDD = 5–16.5 V, VSS = −5 to −16.5 V, and VDRIVE = 2.7–5.25 V, consuming 140 mW at full 250 kSPS operation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 14-bit - guarantees monotonic output with no missing codes over full temperature range. |
| Sampling Rate | 250 kSPS - enables real-time capture of 50 Hz power harmonics up to 49th order with oversampling capability. |
| SNR @ 50 kHz | 82.5 dB min - ensures ≥13.5 effective number of bits (ENOB) for precision measurement in noisy environments. |
| Input Range | ±10 V or ±5 V - selectable via RANGE pin or control register, supporting direct connection to industrial transducers without external scaling. |
| Reference | Internal 2.5 V ±1% (2.49–2.51 V) - eliminates need for external reference; long-term drift ≤150 ppm/1000 hrs. |
| Power Dissipation | 140 mW @ 250 kSPS - optimized for thermally constrained industrial enclosures with minimal heatsinking. |
| Channel Isolation | −100 dB typ - prevents crosstalk between phases in 3-phase power monitoring applications. |
Pinout & Package
AD7657BSTZ uses 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 (±1 µA leakage) inputs supporting true bipolar operation; each pair (V1/V2, V3/V4, V5/V6) shares one CONVST signal. |
| CONVST A/B/C | Conversion Start Control | Edge-triggered inputs initiating simultaneous sampling on respective channel pairs-enables synchronized 3-phase acquisition. |
| REFCAPA/B/C | Reference Decoupling Terminals | Three dedicated pins for 10 µF + 100 nF capacitor placement per ADC pair-critical for maintaining <6 ppm/°C reference tempco. |
| 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 setting parallel (low) or serial (high) interface; daisy-chain capable in serial mode. |
| STBY | Full Power-Down Control | Active-high input reducing supply current to ≤80 µA-enables rapid wake-up (<2 ms) for burst-mode acquisition. |
Key Features
| Feature | Design Value |
|---|---|
| Simultaneous Sampling Architecture | Six independent SAR cores with three dedicated CONVST inputs enable phase-coherent acquisition across all six channels-essential for vector measurements in power quality analyzers. |
| iCMOS Process Integration | Combines high-voltage (±16.5 V) analog front-end with submicron CMOS logic-achieves 14-bit linearity at 250 kSPS in compact LQFP without external level-shifting. |
| Flexible Interface Options | Hardware-selectable parallel (16-bit bus) or SPI/QSPI/MICROWIRE-compatible serial mode with daisy-chain support-reduces host GPIO count and PCB routing complexity. |
| Bipolar Input Range Selection | Pin- or register-controlled ±10 V / ±5 V ranges eliminate external gain stages for common industrial sensor outputs (e.g., ±5 V LVDTs, ±10 V strain gauges). |
| On-Chip Reference System | Integrated 2.5 V reference with internal buffers and dedicated REFCAP pins-ensures stable conversion accuracy without external reference ICs or trimming. |
Applications
| Power Line Monitoring | Industrial Motion Control |
|---|---|
Use Scenario: Real-time acquisition of voltage/current waveforms across all three phases plus neutral in medium-voltage substations. IC Role / Device Role / Timing Role: Simultaneous 6-channel sampling captures phase-aligned data for harmonic analysis, flicker measurement, and fault detection. Use Value: 82.5 dB SNR and −100 dB channel isolation ensure accurate THD calculation (<0.5% error) even under transient grid disturbances. |
Use Scenario: Closed-loop position feedback from six axes (X/Y/Z + rotation/pitch/yaw) in CNC machine tools or robotic arms. IC Role / Device Role / Timing Role: Synchronized sampling of encoder analog outputs and torque sensor signals enables precise cross-axis correlation. Use Value: 4 ns aperture delay matching minimizes inter-channel timing skew, preserving spatial coherence in multi-sensor fusion algorithms. |
| Programmable Logic Controller I/O Module | Test & Measurement Equipment |
Use Scenario: High-density analog input card for PLCs handling mixed-signal field instrumentation (4–20 mA, ±10 V, thermocouple). IC Role / Device Role / Timing Role: Single AD7657BSTZ replaces six discrete 14-bit ADCs-reducing BOM count, layout area, and calibration overhead. Use Value: Integrated reference and ±10 V input range allow direct connection to industrial sensors without external op-amps or voltage references. |
Use Scenario: Modular digitizer channel in automated test equipment requiring synchronized multi-channel capture. IC Role / Device Role / Timing Role: Daisy-chain serial interface enables stacking of multiple AD7657BSTZ units on one SPI bus-scaling to 12+ channels with minimal controller resources. Use Value: 250 kSPS throughput and 550 ns acquisition time support fast transient capture (e.g., switch-mode power supply ripple analysis) with low latency. |
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 | 16-bit resolution, 85.5 dB SNR typ, higher INL (±3 LSB max) vs. AD7657BSTZ's 14-bit/82.5 dB SNR/±1.5 LSB INL | Better suited for metrology-grade applications requiring >15 ENOB; larger code spread increases digital processing load | Select AD7656BSTZ when absolute DC accuracy and harmonic resolution outweigh cost and power constraints. |
| AD7658BSTZ | 12-bit resolution, 73.5 dB SNR typ, lower power (125 mW), relaxed timing (no 250 kSPS guarantee in all modes) | Targeted at cost-sensitive, high-channel-count systems where 12-bit fidelity suffices (e.g., basic motor monitoring) | Choose AD7658BSTZ for volume production where 14-bit performance is unnecessary and BOM reduction is critical. |
Compared with AD7656BSTZ and AD7658BSTZ, the AD7657BSTZ delivers optimal balance of 14-bit precision, 250 kSPS speed, and 140 mW power-making it the preferred choice for industrial control systems demanding both accuracy and real-time responsiveness without over-engineering.
Availability
AD7657BSTZ is available at Aetrix Electronics and suitable for power line monitoring, industrial motion control, and programmable logic controller I/O modules requiring stable component supply and long-term industrial lifecycle support.
Supply support for AD7657BSTZ 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 AD765x family-including AD7657BSTZ-is designed specifically for high-fidelity, multi-channel data acquisition in electric utility, factory automation, and test equipment-emphasizing simultaneous sampling integrity, noise immunity, and system-level integration.
FAQ
What is the maximum sampling rate of the AD7657BSTZ?
The AD7657BSTZ achieves a guaranteed 250 kSPS throughput rate in parallel interface mode, as specified in the Rev. D datasheet. This rate applies to all six channels simultaneously, with conversion time fixed at 3.1 µs and track-and-hold acquisition time of 550 ns. Serial interface operation may reduce effective throughput depending on SCLK frequency and daisy-chain depth.
Does the AD7657BSTZ require an external reference voltage?
No-the AD7657BSTZ includes an internal 2.5 V reference with ±1% initial accuracy (2.49 V to 2.51 V), 6 ppm/°C typical temperature coefficient, and 150 ppm/1000-hour long-term stability. External reference is optional via the REFIN/REFOUT pin but not required for standard operation.
How does the AD7657BSTZ handle bipolar input signals?
The AD7657BSTZ accepts true bipolar analog inputs over ±10 V (±4 × VREF) or ±5 V (±2 × VREF) ranges, selectable via the RANGE pin or control register bits RNGA–RNGC. Its iCMOS process enables direct connection to ±15 V rails (VDD/VSS = ±16.5 V), eliminating external level-shifting circuitry for industrial sensor interfaces.
What interface modes does the AD7657BSTZ support?
The AD7657BSTZ supports three interface configurations: parallel (16-bit multiplexed bus), high-speed serial (SPI/QSPI/MICROWIRE-compatible), and daisy-chain serial (multiple AD7657BSTZ devices sharing one SCLK/CS/DOUT path). Mode selection is controlled by the SER/PAR/SEL pin and register settings.
What is the power consumption of the AD7657BSTZ during active conversion?
At 250 kSPS operation with AVCC = DVCC = VDRIVE = 5.25 V and VDD/VSS = ±16.5 V, the AD7657BSTZ consumes 140 mW (26 mA total supply current). In full power-down mode (STBY high), consumption drops to ≤80 µA-enabling ultra-low-power standby states while retaining fast wake-up (<2 ms).
AD7657BSTZ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- iCMOS®
- Package/Case:
- 64-LQFP
- Packaging:
- Tray
- Product Status:
- Active
- Number of Bits:
- 14
- 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:
- -
AD7657BSTZ FAQ
1.How can I place an order for AD7657BSTZ through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7657BSTZ 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 AD7657BSTZ reliable?
The price and inventory of AD7657BSTZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7657BSTZ is usually 5 days.
3.What payment methods are accepted for AD7657BSTZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7657BSTZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7657BSTZ?
AD7657BSTZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7657BSTZ 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 AD7657BSTZ?
For technical support, including AD7657BSTZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7657BSTZ requirements.
6.How does Aetrix verify that AD7657BSTZ is sourced from the original manufacturer or authorized distributors?
All AD7657BSTZ 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 AD7657BSTZ meets industry standards.
7.What is the process for return or replacement of AD7657BSTZ?
All AD7657BSTZ units undergo pre-shipment inspection (PSI). If there is an issue with AD7657BSTZ, 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 AD7657BSTZ part is unused and in its original packaging.
Return procedure for AD7657BSTZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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