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Analog Devices Inc. AD7660ASTZ
- Part No.:
- AD7660ASTZ
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 48-LQFP
- Datasheet:
-
AD7660ASTZ.pdf
- Description:
- IC ADC 16BIT SAR 48LQFP
- Quantity:
- Payment:
- Shipping:
Inventory:341
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Product details
Overview
AD7660ASTZ from Analog Devices is a 16-bit, 100 kSPS unipolar successive-approximation ADC with single 5 V supply operation, internal conversion clock, and dual serial/parallel interface. It delivers ±3 LSB INL, 87 dB SNR at 10 kHz, and 0–2.5 V analog input range. Used in precision data acquisition for battery-powered instrumentation and medical devices.
For engineers reviewing the AD7660ASTZ datasheet, AD7660ASTZ pinout, AD7660ASTZ application, or AD7660ASTZ equivalent, this page provides verified specifications, package mapping to 48-lead LQFP, confirmed timing behavior (e.g., 2 ms conversion time, 10 ms minimum inter-conversion interval), and validated alternative options for unipolar 16-bit SAR ADC replacement in industrial and portable systems.
Technical Context
The AD7660ASTZ implements a charge redistribution SAR architecture with integrated track-and-hold, delivering no pipeline delay and immediate result availability post-conversion. Its internal error correction circuitry ensures monotonic 16-bit output with no missing codes across –40°C to +85°C.
It supports both parallel and 2-wire serial interfaces compatible with SPI/QSPI/MICROWIRE/DSP logic levels (3 V or 5 V), selectable via SER/PAR pin. The OB/2C pin configures straight binary or twos complement output coding, while EXT/INT, INVSCLK, and INVSYNC pins define serial clock sourcing and synchronization behavior.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 16-bit - guarantees full-scale quantization step of 38.15 mV with 2.5 V reference, enabling sub-40 µV measurement resolution. |
| Throughput Rate | 100 kSPS - completes one full conversion cycle every 10 µs, supporting real-time sampling of signals up to ~45 kHz bandwidth. |
| INL | ±3 LSB max - ensures end-point linearity error ≤0.0046% of full scale, critical for calibrated sensor readout accuracy. |
| S/(N+D) | 87 dB min @ 10 kHz - provides effective noise floor of ≈12.5 µV rms in 10 kHz bandwidth, suitable for high-fidelity signal capture. |
| Analog Input Range | 0 V to 2.5 V - unipolar range referenced to REFGND, requiring external 2.5 V reference (e.g., AD780) for full accuracy. |
| Power Dissipation | 21 mW typical @ 100 kSPS - enables low-thermal-load deployment in compact enclosures; drops to 21 µW @ 100 SPS for ultra-low-power sleep modes. |
| Aperture Jitter | 5 ps rms - limits sampling uncertainty to <0.03° phase error at 100 kHz input, preserving SNR in high-frequency applications. |
Pinout & Package
AD7660ASTZ is packaged in a 48-lead LQFP (ST-48) with exposed pad grounded per datasheet recommendation. Pin numbering follows standard top-view layout with AGND, AVDD, DGND, OVDD, and DVDD power domains isolated per functional group.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IN / INGND | Differential analog input pair | Simultaneously sampled inputs; IN accepts 0–2.5 V signal relative to INGND, rejecting common-mode noise up to 70 dB at 25 kHz. |
| REF / REFGND | External reference voltage interface | Accepts 2.3–2.5 V external reference; REFGND must be tied directly to system analog ground to minimize reference path noise. |
| CNVST | Conversion start trigger | Falling edge initiates conversion after acquisition; jitter-sensitive control input-requires low-noise routing to preserve aperture accuracy. |
| BUSY | Conversion status indicator | Active-HIGH during conversion; falling edge signals valid data ready, usable as hardware handshake for DMA or interrupt-driven reads. |
| SER/PAR | Interface mode select | LOW = parallel 16-bit D[15:0] output; HIGH = serial mode repurposing D4–D11 as SDOUT/SCLK/SYNC/SDIN with configurable clock polarity and framing. |
| OB/2C | Output coding selector | HIGH = straight binary (0x0000 = 0 V); LOW = twos complement (0x8000 = 0 V), enabling seamless integration with signed arithmetic DSP pipelines. |
Key Features
| Feature | Design Value |
|---|---|
| No pipeline delay | Conversion results available immediately after BUSY goes LOW-enables deterministic latency-critical control loops without FIFO buffering. |
| Single 5 V supply operation | Eliminates need for dual ±5 V or separate analog/digital rails; simplifies power design while maintaining 16-bit DC and AC performance. |
| Hardware factory calibration | Guarantees specified INL, DNL, gain, and offset without user calibration-reduces BOM cost and firmware overhead in production systems. |
| Low power-down current | 7 mW max in PD mode-extends battery life in intermittent-sampling applications such as portable data loggers and handheld test equipment. |
| Pin-to-pin compatibility with AD7664 | Enables drop-in upgrade path to higher-performance differential-input variant without PCB redesign or layout changes. |
Applications
| Medical Instrumentation | Industrial Process Control |
|---|---|
Use Scenario: High-accuracy ECG front-end digitizing low-amplitude bio-potential signals with minimal noise injection. IC Role / Device Role / Timing Role: Primary unipolar ADC capturing conditioned analog outputs from instrumentation amplifiers; synchronized via CNVST to avoid jitter-induced distortion. Use Value: 87 dB SNR and 5 ps aperture jitter preserve diagnostic fidelity of microvolt-level cardiac waveforms; 16-bit resolution resolves sub-µV baseline drift. |
Use Scenario: Monitoring temperature, pressure, and flow sensors in PLC I/O modules with long cable runs and noisy factory environments. IC Role / Device Role / Timing Role: Precision analog input channel converting 0–2.5 V sensor outputs; uses INGND as remote ground reference to reject ground loop errors. Use Value: 70 dB CMRR at 25 kHz eliminates interference from variable-frequency drives; no missing codes ensures reliable alarm threshold detection. |
| Battery-Powered Test Equipment | PCMCIA Data Acquisition Cards |
Use Scenario: Portable oscilloscope or spectrum analyzer requiring >90 dB SFDR and extended runtime on Li-ion batteries. IC Role / Device Role / Timing Role: Core ADC in multi-channel acquisition subsystem; leverages power-down mode between triggers to reduce average current draw. Use Value: 21 µW standby power at 100 SPS extends battery life to >100 hours; 100 kSPS throughput captures transient events without aliasing. |
Use Scenario: Legacy PCMCIA-based DAQ cards needing compact, low-voltage-compatible ADCs for field-deployable lab instruments. IC Role / Device Role / Timing Role: Interface-constrained ADC using SER/PAR-selectable 3 V/5 V serial mode to match host controller logic levels. Use Value: SPI/QSPI/MICROWIRE compatibility enables direct connection to x86 southbridge or FPGA soft-core controllers; 48-lead LQFP fits tight card-edge footprints. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 16-bit unipolar SAR ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD7664ASTZ | Differential input architecture; same 16-bit/100 kSPS spec but requires ±2.5 V input swing or external level-shifting for unipolar signals. | Preferred for fully differential sensor interfaces (e.g., strain gauges, RTDs) where common-mode rejection >100 dB is required. | Select AD7664ASTZ only when differential signaling is mandated; not a direct replacement for unipolar IN/INGND topology. |
| ADS8860IPWR | 16-bit, 100 kSPS, SPI-only interface; lower power (1.5 mW @ 100 kSPS); no parallel bus or OB/2C coding option. | Suitable for space-constrained, low-pin-count designs where FPGA or MCU lacks wide parallel bus but supports high-speed SPI. | Choose ADS8860IPWR for new designs prioritizing board area and power over legacy parallel interface support. |
Compared with AD7660ASTZ, AD7664ASTZ offers superior CMRR and differential flexibility but demands input reconfiguration, while ADS8860IPWR reduces power and footprint at the cost of interface versatility and output coding options-making AD7660ASTZ optimal for mixed-signal systems requiring hardware-configurable digital interfacing and guaranteed unipolar linearity.
Availability
AD7660ASTZ is available at Aetrix Electronics and suitable for medical instrumentation, industrial process control, and battery-powered test equipment requiring stable component supply and long-term lifecycle support.
Supply support for AD7660ASTZ 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 AD7660ASTZ belongs to Analog Devices' PulSAR® family of precision SAR ADCs, designed specifically for applications demanding high resolution, low power, and flexible digital interfacing in industrial, medical, and portable instrumentation.
FAQ
What is the maximum recommended analog input voltage for AD7660ASTZ?
The AD7660ASTZ specifies an absolute maximum analog input voltage of –0.1 V to +3.0 V relative to INGND, but its guaranteed linear operating range is 0 V to 2.5 V (VREF). Exceeding 2.5 V risks code saturation and violates the unipolar transfer function; sustained overvoltage beyond –0.1 V or +3.0 V may damage the internal ESD diodes. Always limit input with external clamping if sensor excursions are possible.
Does AD7660ASTZ require external calibration for production use?
No, AD7660ASTZ is hardware factory-calibrated for gain, offset, INL, and DNL across temperature. Its datasheet guarantees ±3 LSB INL and ±1.75 LSB DNL without user calibration. External reference stability (e.g., AD780) and proper PCB layout-especially AGND/DGND separation and decoupling-are the primary factors affecting final system accuracy.
Can AD7660ASTZ operate with a 3.3 V digital interface while using a 5 V analog supply?
Yes. AD7660ASTZ supports mixed-supply operation: AVDD and DVDD at 5 V for analog and core logic, while OVDD can be set to 3.3 V to interface directly with 3.3 V microcontrollers or FPGAs. Digital inputs (CS, RD, SER/PAR, etc.) accept 0.8 V/2.0 V logic thresholds referenced to OVDD, and outputs (D[15:0], BUSY) drive to OVDD – 0.6 V high level.
What is the purpose of the INGND pin on AD7660ASTZ?
INGND is a dedicated analog input ground reference that is sampled simultaneously with IN. It enables true differential input measurement (IN – INGND), rejecting common-mode noise-including ground potential differences between remote sensors and the ADC's local ground. Unlike conventional single-ended ADCs, INGND must be routed as a low-impedance, noise-isolated node-not tied directly to AGND at the device.
Is AD7660ASTZ pin-compatible with any other Analog Devices ADCs?
Yes, AD7660ASTZ is explicitly pin-to-pin compatible with AD7664ASTZ per the datasheet. Both share identical 48-lead LQFP pinout, power domain assignments, and interface signaling. This allows direct substitution when upgrading from unipolar to differential input capability-provided the external analog front-end is modified to deliver differential signals within ±2.5 V range.
AD7660ASTZ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- PulSAR®
- Package/Case:
- 48-LQFP
- Packaging:
- Tray
- Product Status:
- Active
- Number of Bits:
- 16
- Sampling Rate (Per Second):
- 100k
- Number of Inputs:
- 1
- Input Type:
- Pseudo-Differential
- Data Interface:
- SPI, Parallel, DSP
- Configuration:
- S/H-ADC
- Ratio - S/H:ADC:
- 1:1
- Number of A/D Converters:
- 1
- Architecture:
- SAR
- Reference Type:
- External
- Voltage - Supply, Analog:
- 5V
- Voltage - Supply, Digital:
- 5V
- Features:
- -
- Operating Temperature:
- -40°C ~ 85°C
- Supplier Device Package:
- 48-LQFP (7x7)
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
AD7660ASTZ FAQ
1.How can I place an order for AD7660ASTZ through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7660ASTZ 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 AD7660ASTZ reliable?
The price and inventory of AD7660ASTZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7660ASTZ is usually 5 days.
3.What payment methods are accepted for AD7660ASTZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7660ASTZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7660ASTZ?
AD7660ASTZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7660ASTZ 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 AD7660ASTZ?
For technical support, including AD7660ASTZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7660ASTZ requirements.
6.How does Aetrix verify that AD7660ASTZ is sourced from the original manufacturer or authorized distributors?
All AD7660ASTZ 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 AD7660ASTZ meets industry standards.
7.What is the process for return or replacement of AD7660ASTZ?
All AD7660ASTZ units undergo pre-shipment inspection (PSI). If there is an issue with AD7660ASTZ, 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 AD7660ASTZ part is unused and in its original packaging.
Return procedure for AD7660ASTZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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