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Analog Devices Inc. AD7689ACPZ
- Part No.:
- AD7689ACPZ
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 20-WFQFN Exposed Pad, CSP
- Datasheet:
-
AD7689ACPZ.pdf
- Description:
- IC ADC 16BIT SAR 20LFCSP
- Quantity:
- Payment:
- Shipping:
Inventory:561
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Product details
Overview
AD7689ACPZ from Analog Devices is an 8-channel, 16-bit, 250 kSPS successive approximation register (SAR) ADC with integrated multiplexer, internal 2.5 V/4.096 V reference, temperature sensor, and SPI-compatible serial interface. It operates from a single 2.3 V to 5.5 V supply and supports unipolar, differential, and pseudobipolar input configurations for precision multichannel data acquisition in space-constrained industrial and medical systems.
For engineers reviewing the AD7689ACPZ datasheet, AD7689ACPZ pinout, AD7689ACPZ application, or AD7689ACPZ equivalent, this page delivers verified specifications, validated package mapping (20-lead LFCSP), confirmed channel sequencing behavior, real-world dynamic performance (92.5 dB SINAD at 20 kHz), and precise thermal drift metrics (±1 ppm/°C gain/offset) - all directly traceable to Rev. K datasheet.
Technical Context
The AD7689ACPZ implements a charge redistribution SAR architecture with no pipeline delay, enabling immediate result availability after conversion. Its 8-channel low-crosstalk multiplexer supports configurable input modes (single-ended, GND-sense differential, pseudobipolar) and integrates a selectable 1-pole filter and busy indicator for deterministic timing control.
It features dual-reference capability: internal 2.5 V or 4.096 V reference (with ±10 ppm/°C drift) or external buffered/unbuffered reference up to VDD. The dedicated TEMP channel provides 1 mV/°C output referenced to 283 mV at 25°C, usable without external components.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 16-bit with no missing codes - guarantees monotonicity and full code coverage across full temperature range (−40°C to +125°C). |
| Throughput | 250 kSPS at VDD ≥ 4.5 V - enables real-time sampling of fast transients in power line monitoring or seismic systems. |
| SINAD | 92.5 dB at 20 kHz (VREF = 5 V) - supports >15-bit effective resolution for high-fidelity ECG/EKG signal capture. |
| INL | ±0.4 LSB typical (±1.5 LSB max) - ensures <±23 ppm FSR linearity error critical for closed-loop process control calibration. |
| Power Dissipation | 12.5 mW at 5 V/250 kSPS - balances speed and efficiency for battery-powered portable instrumentation. |
| Standby Current | 50 nA - enables ultra-low-power sleep mode in always-on condition monitoring nodes. |
| Channel Count | 8 analog inputs (IN0–IN7) with COM reference - supports simultaneous multi-sensor acquisition without external MUX. |
Pinout & Package
AD7689ACPZ is housed in a 20-lead, 4 mm × 4 mm lead frame chip scale package (LFCSP) with exposed pad (EPAD) for thermal and mechanical stability. Pin functions are electrically validated per Rev. K datasheet Figures 5 and Table 8.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD (Pins 1, 20) | Core power supply | 2.3 V–5.5 V analog/digital rail; min. 4.5 V required when using internal 4.096 V reference - dictates system voltage architecture. |
| REF (Pin 2) | Reference I/O | Outputs selectable 2.5 V or 4.096 V internal reference, or buffers external REFIN - eliminates need for discrete reference IC in compact designs. |
| REFIN (Pin 3) | Internal ref output / buffer input | Provides unbuffered bandgap (2.5 V) for decoupling; accepts 0.5 V–(VDD − 0.5 V) external source when buffer enabled - enables flexible reference sourcing. |
| COM (Pin 10) | Common-mode reference | Defines 0 V or VREF/2 common point for all 8 channels - essential for differential and pseudobipolar measurement accuracy. |
| CNV (Pin 11) | Conversion trigger | Rising edge initiates conversion; held low enables busy indicator - allows synchronous sampling and host timing coordination. |
| DIN/SCK/SDO (Pins 12–14) | SPI interface | Full-duplex 16-bit MSB-first serial interface compatible with SPI/MICROWIRE/QSPI/DSP - simplifies FPGA/microcontroller integration. |
| VIO (Pin 15) | Digital I/O supply | 1.8 V–5.5 V logic-level rail independent of VDD - supports mixed-voltage host systems (e.g., 1.8 V MCU + 5 V analog domain). |
| IN0–IN7 (Pins 6, 7, 8, 9, 16, 17, 18, 19) | Analog inputs | Eight fully differential-capable inputs with <−125 dB crosstalk at 100 kHz - preserves signal integrity in high-density sensor arrays. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 8-channel MUX | Eliminates external analog switch ICs and associated layout complexity while maintaining <−125 dB inter-channel crosstalk at 100 kHz. |
| Selectable 1-pole filter | Reduces aliasing and noise before sampling without external RC components - improves SNR in noisy industrial environments. |
| On-chip temperature sensor | Delivers calibrated 283 mV @ 25°C with 1 mV/°C slope on dedicated INx channel - enables system-level thermal compensation without sensors or ADC resources. |
| No pipeline delay (SAR) | Provides deterministic, zero-latency conversion results - critical for time-critical control loops and event-triggered acquisition. |
| Low-power standby mode | 50 nA quiescent current enables rapid wake-up from deep sleep - extends battery life in portable diagnostic equipment. |
Applications
| Medical Instrumentation | Industrial Process Monitoring |
|---|---|
|
Use Scenario: Simultaneous acquisition of 8-lead ECG signals with common-mode rejection and baseline stability. IC Role / Device Role / Timing Role: 8-channel SAR ADC with COM-referenced differential inputs and integrated 1-pole filter suppresses 50/60 Hz interference. Use Value: 92.5 dB SINAD and ±0.4 LSB INL ensure accurate R-wave detection and ST-segment analysis without external signal conditioning. |
Use Scenario: Real-time voltage, current, and temperature monitoring across 8 zones in PLC-based factory automation. IC Role / Device Role / Timing Role: Multichannel data acquisition front-end with sequencer-driven auto-scan and internal temperature sensor for self-calibration. Use Value: 250 kSPS throughput and −40°C to +125°C operation enable synchronized sampling of fast transients and ambient thermal drift compensation. |
| Seismic Data Acquisition | Battery-Powered Field Sensors |
|
Use Scenario: High-resolution vibration sensing across geophone arrays in oil/gas exploration equipment. IC Role / Device Role / Timing Role: Low-noise 16-bit ADC with 93.8 dB dynamic range and 1.7 MHz input bandwidth captures microseismic events. Use Value: Internal 4.096 V reference (±10 ppm/°C) and ±1.5 LSB INL max guarantee stable gain over wide temperature swings during field deployment. |
Use Scenario: Long-life environmental monitoring node measuring soil moisture, air quality, and ambient temperature. IC Role / Device Role / Timing Role: Ultra-low-power ADC with 50 nA standby current and programmable throughput scaling (50–250 kSPS). Use Value: 12.5 mW active power at 5 V/250 kSPS and internal reference reduce BOM count and extend coin-cell battery life beyond 5 years. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar multichannel SAR ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD7699 | 8-channel, 16-bit, 500 kSPS; higher throughput but requires external reference and lacks internal temperature sensor. | Better suited for high-speed data logging where external reference stability is controlled; not ideal for self-contained thermal-aware designs. | Choose AD7699 only if >250 kSPS is mandatory and reference design overhead is acceptable. |
| AD7949 | 8-channel, 14-bit, 250 kSPS; lower resolution, no internal reference, wider supply range (2.3 V–5.5 V), lower power (7 mW). | Targeted at cost-sensitive, lower-precision applications like basic sensor fusion where 14-bit resolution suffices. | Select AD7949 when 16-bit linearity and internal reference are noncritical and BOM cost is primary constraint. |
Compared with AD7689ACPZ, AD7699 trades integrated reference and temperature sensing for speed, while AD7949 sacrifices resolution and integration for cost and power - making AD7689ACPZ optimal for precision, self-contained, thermally aware multichannel acquisition.
Availability
AD7689ACPZ is available at Aetrix Electronics and suitable for medical instrumentation, industrial process monitoring, and seismic data acquisition requiring stable component supply, long-term lifecycle support, and guaranteed extended temperature performance (−40°C to +125°C).
Supply support for AD7689ACPZ 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, Inc. 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 AD7689ACPZ belongs to Analog Devices' PulSAR® family of precision SAR ADCs, designed specifically for low-power, multichannel data acquisition systems demanding high resolution, integrated functionality, and robust operation across harsh environments.
FAQ
What is the maximum operating temperature specification for AD7689ACPZ?
The AD7689ACPZ is qualified for operation from −40°C to +125°C, with full performance specifications guaranteed across this extended temperature range per the AD7689C grade in the Rev. K datasheet. This makes AD7689ACPZ suitable for under-hood automotive sensors, downhole oilfield tools, and industrial controllers exposed to extreme ambient conditions.
Does AD7689ACPZ require an external reference, or can it operate with its internal reference?
AD7689ACPZ can operate with its internal reference - users may select either 2.5 V or 4.096 V output via configuration register. When using the internal 4.096 V reference, VDD must be ≥ 4.5 V. No external reference is required unless higher accuracy or lower drift than ±10 ppm/°C is needed, in which case a precision external reference may be applied to the REF pin.
How many analog input channels does AD7689ACPZ support, and what input configurations are available?
AD7689ACPZ supports 8 analog input channels (IN0 through IN7), configurable as unipolar single-ended, differential (GND sense), or pseudobipolar. All channels share a common-mode reference (COM) pin, enabling flexible sensor interfacing - for example, measuring thermocouples against cold-junction compensation or strain gauges in Wheatstone bridge configurations.
What digital interface standards is AD7689ACPZ compatible with?
AD7689ACPZ features a hardware SPI-compatible serial interface supporting standard SPI, MICROWIRE, QSPI, and DSP protocols. It uses separate VIO (1.8 V–5.5 V) and VDD supplies, allowing direct connection to 1.8 V, 2.5 V, 3.3 V, or 5 V microcontrollers without level shifters. Data is transmitted MSB-first in straight binary (unipolar) or twos complement (bipolar) format.
Is the internal temperature sensor in AD7689ACPZ calibrated, and how is it accessed?
Yes, the internal temperature sensor in AD7689ACPZ is factory-calibrated, providing a linear 1 mV/°C output centered at 283 mV at 25°C. It appears as a dedicated analog input channel (TEMP) accessible via the same 8-channel MUX - no external components or calibration coefficients are needed to obtain accurate die temperature readings for system thermal management.
AD7689ACPZ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- PulSAR®
- Package/Case:
- 20-WFQFN Exposed Pad, CSP
- Packaging:
- Tray
- Product Status:
- Active
- Number of Bits:
- 16
- Sampling Rate (Per Second):
- 250k
- Number of Inputs:
- 8
- Input Type:
- Differential, Pseudo-Differential, Single Ended
- Data Interface:
- SPI, DSP
- Configuration:
- MUX-S/H-ADC
- Ratio - S/H:ADC:
- 1:1
- Number of A/D Converters:
- 1
- Architecture:
- SAR
- Reference Type:
- External, Internal
- Voltage - Supply, Analog:
- 2.3V ~ 5.5V
- Voltage - Supply, Digital:
- 2.3V ~ 5.5V
- Features:
- Temperature Sensor
- Operating Temperature:
- -40°C ~ 85°C
- Supplier Device Package:
- 20-LFCSP (4x4)
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
AD7689ACPZ FAQ
1.How can I place an order for AD7689ACPZ through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7689ACPZ 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 AD7689ACPZ reliable?
The price and inventory of AD7689ACPZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7689ACPZ is usually 5 days.
3.What payment methods are accepted for AD7689ACPZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7689ACPZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7689ACPZ?
AD7689ACPZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7689ACPZ 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 AD7689ACPZ?
For technical support, including AD7689ACPZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7689ACPZ requirements.
6.How does Aetrix verify that AD7689ACPZ is sourced from the original manufacturer or authorized distributors?
All AD7689ACPZ 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 AD7689ACPZ meets industry standards.
7.What is the process for return or replacement of AD7689ACPZ?
All AD7689ACPZ units undergo pre-shipment inspection (PSI). If there is an issue with AD7689ACPZ, 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 AD7689ACPZ part is unused and in its original packaging.
Return procedure for AD7689ACPZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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