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Analog Devices Inc. AD7658YSTZ
- Part No.:
- AD7658YSTZ
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 64-LQFP
- Datasheet:
-
AD7658YSTZ.pdf
- Description:
- IC ADC 12BIT SAR 64LQFP
- Quantity:
- Payment:
- Shipping:
Inventory:214
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Product details
Overview
AD7658YSTZ from Analog Devices is a 12-bit, 6-channel simultaneous-sampling SAR ADC with true bipolar ±4 × VREF (±10 V) and ±2 × VREF (±5 V) input ranges, 250 kSPS throughput, on-chip 2.5 V reference, and parallel/serial/daisy-chain interface modes - used in multi-axis motor control feedback loops requiring synchronized voltage/current acquisition.
For engineers reviewing the AD7658YSTZ datasheet, AD7658YSTZ pinout, AD7658YSTZ application, or AD7658YSTZ equivalent, this page delivers verified specifications, Y-grade (−40°C to +125°C) thermal performance, iCMOS process advantages for high-voltage analog integration, and real-world interface timing constraints for deterministic system design.
Technical Context
The AD7658YSTZ implements six independent 12-bit successive approximation register (SAR) cores sharing a common internal oscillator and reference buffer architecture. Each channel features a track-and-hold amplifier with 12 MHz full-power bandwidth and aperture jitter of 35 ps typ, enabling accurate sampling of fast transient waveforms across all six inputs simultaneously.
Conversion initiation is controlled via three dedicated CONVST pins (A/B/C), allowing independent triggering of three ADC pairs (V1/V2, V3/V4, V5/V6). The device supports hardware- or software-selectable input ranges (±10 V / ±5 V) and operates with dual supply rails: VDD/VSS (±5 V to ±16.5 V) for analog front-end and AVCC/DVCC/VDRIVE (4.75 V–5.25 V / 2.7 V–5.25 V) for digital logic and interface levels.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit - guarantees monotonic output with no missing codes over full temperature range. |
| Throughput Rate | 250 kSPS - enables 4 µs cycle time per full 6-channel conversion in parallel mode. |
| Input Voltage Range | ±10 V or ±5 V - selectable via RANGE pin or control register, supporting direct connection to industrial transducers without external signal conditioning. |
| SINAD / SNR | 73 dB min / 73.5 dB typ at 50 kHz - sufficient for Class B power quality monitoring per IEC 61000-4-30. |
| Channel-to-Channel Isolation | −100 dB typ - prevents crosstalk between simultaneously sampled phases in 3-phase motor current sensing. |
| Power Dissipation | 140 mW at 250 kSPS - enables thermally constrained designs with minimal heatsinking in sealed enclosures. |
| Operating Temperature | −40°C to +125°C (Y grade) - qualified for under-hood automotive and industrial drive environments. |
Pinout & Package
AD7658YSTZ 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 buffers (REFCAPA/B/C) and analog supplies (AVCC).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| V1–V6 | Analog Input Channels | Single-ended, high-impedance (±1 µA leakage) inputs supporting true bipolar operation up to ±10 V referenced to AGND. |
| CONVST A/B/C | Conversion Start Control | Edge-triggered inputs initiating simultaneous sampling on channel pairs (V1/V2, V3/V4, V5/V6); critical for phase-aligned acquisition in motor control. |
| REFIN/REFOUT | Reference Interface | 2.5 V internal reference output or external reference input; buffered to drive 10 µF decoupling caps on REFCAPA/B/C pins. |
| DB0–DB15 | Data Bus (Parallel Mode) | 16-bit bidirectional bus supporting multiplexed or non-multiplexed read/write; DB0–DB2 also serve as SEL A/B/C in serial mode. |
| SER/PAR/SEL | Interface Mode Select | Hardware-configurable pin setting parallel (high) or serial (low) interface; eliminates firmware reconfiguration during boot. |
| STBY | Full Power-Down Control | Active-high signal reducing quiescent current to ≤80 µA - essential for low-duty-cycle data loggers. |
Key Features
| Feature | Design Value |
|---|---|
| Simultaneous Sampling Architecture | Six independent track-and-hold amplifiers enable phase-coherent acquisition across all channels - required for vector control of PMSM/BLDC motors. |
| iCMOS Process Technology | Enables ±16.5 V analog supply rails with 5 V digital logic, eliminating level-shifting circuitry and reducing BOM count in high-voltage industrial systems. |
| Daisy-Chain Serial Interface | Allows cascading multiple AD7658YSTZ devices on a single SPI bus with shared SCLK/CS, reducing microcontroller pin count in modular DAQ systems. |
| On-Chip Reference Buffering | Three dedicated reference buffer outputs (via REFCAPA/B/C) support stable 2.5 V reference distribution to each ADC pair - avoids external op-amp compensation networks. |
| Hardware-Selectable Input Ranges | RANGE pin directly configures ±10 V or ±5 V full-scale without register writes - simplifies startup sequence in safety-critical applications. |
Applications
| Power Line Monitoring | Industrial Motor Drives |
|---|---|
Use Scenario: Real-time measurement of voltage, current, and harmonic content across three-phase AC mains feeding factory equipment. IC Role / Device Role / Timing Role: Simultaneous 6-channel sampling captures synchronized line-to-line voltages and phase currents for RMS, THD, and flicker calculation per IEC 61000-4-30 Class A. Use Value: −100 dB channel isolation ensures accurate cross-phase harmonic analysis without inter-channel leakage skewing spectral results. |
Use Scenario: Closed-loop field-oriented control (FOC) of 3-phase permanent magnet synchronous motors in HVAC compressors and servo drives. IC Role / Device Role / Timing Role: Simultaneous sampling of two motor phase currents and DC bus voltage enables precise torque estimation and PWM synchronization within <1 µs timing budget. Use Value: 250 kSPS throughput provides >40 kHz effective control loop update rate - exceeding minimum 20 kHz requirement for high-bandwidth torque control. |
| Multi-Axis Positioning Systems | Test & Measurement Equipment |
Use Scenario: High-precision coordinate measuring machines (CMMs) acquiring position feedback from six linear encoders and tilt sensors during dynamic motion profiling. IC Role / Device Role / Timing Role: Six-channel simultaneous capture eliminates time-skew errors between axes, preserving spatial correlation in sub-micron positioning accuracy. Use Value: Aperture delay matching ≤4 ns ensures <0.01° angular error in multi-axis interpolation algorithms at 10 kHz servo update rates. |
Use Scenario: Modular data acquisition modules for automated test equipment (ATE) requiring configurable analog input resolution and sampling depth. IC Role / Device Role / Timing Role: Configurable 12-bit resolution and ±10 V input range allow reuse across low-cost sensor validation and high-fidelity waveform capture tasks. Use Value: Parallel + serial interface flexibility supports both high-speed FPGA-based acquisition and low-pin-count microcontroller integration in compact form factors. |
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 |
|---|---|---|---|
| AD7656YSTZ | 16-bit resolution, 84 dB SINAD, higher power (140 mW vs. same), identical pinout and interface. | Required where 16-bit precision is needed for vibration analysis or high-resolution energy metering. | Select AD7656YSTZ when quantization noise must be <0.0015% FSR - not suitable for cost-sensitive 12-bit-only systems. |
| ADS8686SIPWR | 16-bit, 500 kSPS, integrated PGA, SPI-only interface, smaller 32-QFN package, no on-chip reference. | Better suited for space-constrained portable instruments needing programmable gain and higher speed. | Choose ADS8686SIPWR only if board area is critical and external reference/PGA are acceptable trade-offs for reduced footprint. |
Compared with AD7658YSTZ, AD7656YSTZ offers higher resolution at identical speed and thermal grade but increases system cost and power; ADS8686SIPWR trades pin compatibility and integrated reference for smaller size and higher speed - neither is drop-in, requiring layout and firmware changes.
Availability
AD7658YSTZ is available at Aetrix Electronics and suitable for power line monitoring, industrial motor drives, multi-axis positioning systems, and test & measurement equipment requiring stable component supply across extended temperature ranges.
Supply support for AD7658YSTZ 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 AD7656/AD7657/AD7658 family was designed specifically for industrial automation and energy infrastructure applications demanding simultaneous sampling, high voltage tolerance, and extended temperature operation - leveraging iCMOS process to integrate robust analog front-ends with low-power digital interfaces.
FAQ
What is the maximum analog input frequency supported by AD7658YSTZ?
The AD7658YSTZ has a full-power bandwidth of 12 MHz (−3 dB) and 2 MHz (−0.1 dB), enabling accurate digitization of signals up to 2 MHz without significant amplitude attenuation. This specification is validated under standard operating conditions with proper PCB layout and decoupling, and applies directly to the AD7658YSTZ Y-grade variant across its full −40°C to +125°C temperature range.
Does AD7658YSTZ require an external reference, or does it include an internal one?
The AD7658YSTZ integrates a 2.5 V on-chip reference with ±0.02% initial accuracy, 6 ppm/°C max temperature coefficient, and 150 ppm long-term stability. It can operate using this internal reference (enabled via REFEN pin) or accept an external reference applied to the REFIN/REFOUT pin - both configurations are fully supported in the AD7658YSTZ datasheet and require no hardware modification.
How does the AD7658YSTZ handle simultaneous sampling across all six channels?
The AD7658YSTZ uses six independent track-and-hold amplifiers, each associated with one analog input (V1–V6). Three CONVST pins (A/B/C) trigger conversions on channel pairs: CONVST A → V1/V2, CONVST B → V3/V4, CONVST C → V5/V6. All six conversions complete within 3.1 µs, ensuring truly simultaneous result capture - a capability confirmed in the AD7658YSTZ timing diagrams and functional block diagram.
What is the purpose of the REFCAPA, REFCAPB, and REFCAPC pins on AD7658YSTZ?
REFCAPA, REFCAPB, and REFCAPC are dedicated decoupling terminals for the internal reference buffers driving each ADC pair (V1/V2, V3/V4, V5/V6). Each requires 10 µF + 100 nF capacitors to AGND to suppress reference noise and maintain ≤1 LSB integral nonlinearity - a requirement explicitly specified in the AD7658YSTZ Pin Function Descriptions table and Layout section.
Can AD7658YSTZ operate with different supply voltages for analog and digital sections?
Yes. AD7658YSTZ requires separate analog (VDD/VSS = ±5 V to ±16.5 V; AVCC = 4.75–5.25 V) and digital (DVCC = 4.75–5.25 V; VDRIVE = 2.7–5.25 V) supplies. The iCMOS process allows these domains to operate at different voltage levels while maintaining signal integrity - a key feature documented in the AD7658YSTZ General Description and Absolute Maximum Ratings tables.
AD7658YSTZ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- iCMOS®
- Package/Case:
- 64-LQFP
- Packaging:
- Tray
- Product Status:
- Active
- Number of Bits:
- 12
- 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:
- -
AD7658YSTZ FAQ
1.How can I place an order for AD7658YSTZ through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7658YSTZ 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 AD7658YSTZ reliable?
The price and inventory of AD7658YSTZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7658YSTZ is usually 5 days.
3.What payment methods are accepted for AD7658YSTZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7658YSTZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7658YSTZ?
AD7658YSTZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7658YSTZ 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 AD7658YSTZ?
For technical support, including AD7658YSTZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7658YSTZ requirements.
6.How does Aetrix verify that AD7658YSTZ is sourced from the original manufacturer or authorized distributors?
All AD7658YSTZ 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 AD7658YSTZ meets industry standards.
7.What is the process for return or replacement of AD7658YSTZ?
All AD7658YSTZ units undergo pre-shipment inspection (PSI). If there is an issue with AD7658YSTZ, 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 AD7658YSTZ part is unused and in its original packaging.
Return procedure for AD7658YSTZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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