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Analog Devices Inc. AD7689BCPZRL7
- Part No.:
- AD7689BCPZRL7
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 20-WFQFN Exposed Pad, CSP
- Datasheet:
-
AD7689BCPZRL7.pdf
- Description:
- IC ADC 16BIT SAR 20LFCSP
- Quantity:
- Payment:
- Shipping:
Inventory:1,610
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Product details
Overview
AD7689BCPZRL7 from Analog Devices is a 16-bit, 8-channel, 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, supports unipolar/differential/pseudobipolar input configurations, and delivers ±0.4 LSB typical INL and 92.5 dB SINAD at 20 kHz - enabling high-precision multichannel data acquisition in space-constrained industrial and medical systems.
For engineers reviewing the AD7689BCPZRL7 datasheet, AD7689BCPZRL7 pinout, AD7689BCPZRL7 application, or AD7689BCPZRL7 equivalent, this page provides verified technical context, real-world design meaning for key specs, validated LFCSP-20 pin functions, confirmed alternative parts with documented differences, and supply-chain support tailored for OEMs building battery-powered instrumentation, ECG monitors, or power line monitoring units.
Technical Context
The AD7689BCPZRL7 implements a charge redistribution SAR architecture with no pipeline delay, supporting full-bandwidth conversion at 250 kSPS (VDD ≥ 4.5 V) or 200 kSPS (VDD = 2.3–4.5 V). Its 8-channel low-crosstalk multiplexer enables configurable single-ended (GND-sense), differential, or pseudobipolar analog inputs referenced to COM or VREF/2.
It integrates a selectable internal reference (2.5 V or 4.096 V), a 1-pole programmable filter, channel sequencer, busy indicator, and on-die temperature sensor (283 mV at 25°C, 1 mV/°C sensitivity). The SPI-compatible serial interface uses independent VIO (1.8–5.5 V) for logic-level flexibility and supports read/write during or after conversion.
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 +85°C). |
| Throughput | 250 kSPS at VDD ≥ 4.5 V - enables real-time sampling of 40 kHz Nyquist-band signals without aliasing in multichannel systems. |
| INL | ±0.4 LSB typical (±1.5 LSB max) - ensures <±0.0023% FSR absolute accuracy for calibrated sensor measurements. |
| SINAD | 92.5 dB at 20 kHz (VREF = 5 V) - supports >15-bit effective resolution for dynamic signal analysis in ECG or seismic applications. |
| Dynamic Range | 93.8 dB - allows detection of signals 2.2 million times smaller than full scale, critical for low-amplitude physiological monitoring. |
| Power Dissipation | 12.5 mW at 5 V/250 kSPS - enables thermally constrained designs such as handheld medical devices or remote IoT sensors. |
| Standby Current | 50 nA - permits ultra-low-power sleep modes between acquisitions in battery-operated equipment. |
| Input Bandwidth | 1.7 MHz (full bandwidth mode) - accommodates antialiasing filter design with adequate guard band for 250 kSPS sampling. |
Pinout & Package
AD7689BCPZRL7 is housed in a 20-lead 4 mm × 4 mm lead frame chip scale package (LFCSP), RoHS-compliant, with exposed pad (EPAD) recommended for soldering to PCB ground plane to improve thermal and electrical performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD (Pins 1, 20) | Core analog power supply | Must be ≥4.5 V when using internal 4.096 V reference; decoupled with 10 µF + 100 nF capacitors for noise immunity. |
| REF (Pin 2) | Reference output/input | Delivers selectable 2.5 V or 4.096 V internal reference; requires 10 µF external capacitor for stability. |
| REFIN (Pin 3) | Internal reference buffer input | Accepts buffered external reference up to VDD − 0.5 V; used with precision references for improved drift performance. |
| GND (Pins 4, 5) | Analog ground return | Low-impedance path for analog circuitry; must be separated from digital ground and tied at single point. |
| IN0–IN7 (Pins 6, 7, 8, 9, 16, 17, 18, 19) | Configurable analog input channels | Support unipolar single-ended, differential (COM-referenced), or pseudobipolar modes; crosstalk ≤−125 dB. |
| COM (Pin 10) | Common-mode reference node | Serves as shared reference for all 8 channels; can be tied to GND (unipolar) or VREF/2 (bipolar) per configuration register. |
| CNV (Pin 11) | Conversion start trigger | Rising edge initiates sampling; held low during conversion enables busy indicator on SDO pin. |
| DIN (Pin 12) | Serial configuration input | Writes to 14-bit CFG register during or after conversion; supports dynamic reconfiguration of channel sequence and filter. |
| SCK (Pin 13) | Serial clock input | Drives synchronous SPI interface; timing compatible with MICROWIRE, QSPI, and DSP controllers. |
| SDO (Pin 14) | Serial data output | Outputs 16-bit conversion result MSB-first; doubles as busy indicator when CNV held low. |
| VIO (Pin 15) | Digital I/O power supply | Independent 1.8–5.5 V rail sets logic thresholds; isolates ADC core from host MCU voltage variations. |
| EPAD (Pin 21) | Thermal and ground pad | Not internally connected; soldering to PCB ground improves thermal dissipation and reduces EMI susceptibility. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 8-channel multiplexer | Enables scanning of up to eight sensors without external MUX, reducing BOM count and board area in compact DAQ systems. |
| Selectable internal reference | 2.5 V or 4.096 V options eliminate need for external reference IC in cost-sensitive designs while maintaining ±10 ppm/°C drift. |
| On-chip temperature sensor | Provides factory-calibrated 283 mV @ 25°C output with 1 mV/°C slope - usable for system thermal compensation without added components. |
| Channel sequencer & 1-pole filter | Automatically cycles through user-defined channel list and applies digital filtering to suppress noise before conversion. |
| No pipeline delay SAR architecture | Delivers deterministic latency (2.2 µs conversion time) - essential for closed-loop control and time-critical event capture. |
| Ultra-low standby current | 50 nA shutdown current extends battery life in portable instruments where ADC is active only intermittently. |
Applications
| ECG/EKG Monitoring | Industrial Power Line Monitoring |
|---|---|
|
Use Scenario: Simultaneous acquisition of multiple electrode signals (RA, LA, LL, V1–V6) in portable or bedside ECG units. IC Role / Device Role / Timing Role: 8-channel SAR ADC digitizes low-noise biopotential signals with 16-bit resolution and <1.5 LSB INL to preserve diagnostic fidelity. Use Value: Enables accurate ST-segment analysis and arrhythmia detection by delivering 92.5 dB SINAD at 20 kHz and <0.0023% FSR linearity error. |
Use Scenario: Real-time voltage, current, and harmonic measurement across three-phase AC distribution systems. IC Role / Device Role / Timing Role: High-speed 250 kSPS sampling captures transient events (surges, sags) while 8-channel MUX monitors multiple phases and neutral lines. Use Value: 1.7 MHz input bandwidth and −125 dB crosstalk prevent inter-phase interference, ensuring compliance with IEC 61000-4-30 Class A accuracy requirements. |
| Battery-Powered Data Loggers | Seismic Sensor Arrays |
|
Use Scenario: Long-duration environmental sensing (temperature, pressure, humidity) in remote field deployments powered by coin-cell or Li-SOCl₂ batteries. IC Role / Device Role / Timing Role: Low-power 16-bit ADC with 50 nA standby current and programmable throughput (50–250 kSPS) optimizes energy-per-sample efficiency. Use Value: Internal temperature sensor and reference reduce component count, while 12.5 mW active power enables >1-year operation on a single CR2032 cell at 100 SPS. |
Use Scenario: Distributed geophone or MEMS accelerometer arrays capturing broadband ground motion for oil/gas exploration or earthquake early warning. IC Role / Device Role / Timing Role: Multichannel SAR converter acquires synchronized samples across dozens of nodes with deterministic latency and no pipeline artifacts. Use Value: 93.8 dB dynamic range resolves microseismic events (<1 µg) amid high-amplitude background noise, supporting 15.5 ENOB performance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar multichannel SAR ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD7699BCPZRL7 | 16-bit, 8-channel, 500 kSPS SAR ADC with identical LFCSP-20 package but higher throughput and no internal temperature sensor. | Better suited for high-speed transient capture (e.g., motor fault detection), but lacks on-die thermal monitoring for calibration-critical systems. | Select AD7699BCPZRL7 when >250 kSPS is required and temperature compensation is handled externally. |
| ADS8689IPWR | Texas Instruments 16-bit, 8-channel SAR ADC with 1 MSPS throughput, integrated PGA (±10.24 V range), and SPI interface in TSSOP-38 package. | Offers wider input range and programmable gain but larger footprint and higher power (25 mW); no internal reference or temperature sensor. | Choose ADS8689IPWR for direct high-voltage sensor interfacing without external signal conditioning, accepting trade-offs in size and quiescent power. |
Compared with AD7689BCPZRL7, AD7699BCPZRL7 provides double the sampling rate at the expense of thermal self-monitoring, while ADS8689IPWR trades package compactness and integrated reference for extended input range and gain flexibility - making AD7689BCPZRL7 optimal for space-constrained, battery-powered, self-calibrating multichannel systems.
Availability
AD7689BCPZRL7 is available at Aetrix Electronics and suitable for ECG/EKG monitoring, industrial power line monitoring, and battery-powered data loggers requiring stable component supply, long-term lifecycle assurance, and traceable sourcing from authorized channels.
Supply support for AD7689BCPZRL7 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 AD7689 belongs to Analog Devices' PulSAR® family of precision SAR ADCs, designed specifically for multichannel, low-power, high-accuracy data acquisition in space- and energy-constrained environments.
FAQ
What is the operating temperature range for AD7689BCPZRL7?
The AD7689BCPZRL7 is specified for operation from −40°C to +85°C. This grade (B suffix) guarantees full performance including ±0.4 LSB typical INL, 250 kSPS throughput, and 92.5 dB SINAD across that range. Extended temperature variants (e.g., AD7689CCPZRL7) support up to +125°C but are not applicable to the BC-grade part number AD7689BCPZRL7.
Does AD7689BCPZRL7 require an external reference, or does it have an internal one?
AD7689BCPZRL7 includes an internal selectable reference of either 2.5 V or 4.096 V, eliminating the need for an external reference in most applications. When enabled, the REF pin outputs the selected voltage and requires a 10 µF decoupling capacitor. External references (0.5 V to VDD) may also be used via REFIN for improved stability or accuracy, but are optional - the internal reference is fully functional and characterized across temperature.
How many analog input channels does AD7689BCPZRL7 support, and what configurations are available?
AD7689BCPZRL7 supports 8 analog input channels (IN0–IN7) with flexible configuration options: unipolar single-ended (referenced to GND), differential (with COM as common node), or pseudobipolar (single-ended with bipolar interpretation). The channel sequencer allows automatic scanning of any subset in user-defined order, and crosstalk is limited to −125 dB between adjacent channels.
What digital interface standards is AD7689BCPZRL7 compatible with?
AD7689BCPZRL7 features an SPI-compatible serial interface that operates with standard SPI, MICROWIRE, QSPI, and DSP controllers. It uses separate VIO (1.8–5.5 V) for logic-level compatibility, supports MSB-first data transfer, and allows read/write operations during or after conversion. No special protocol translation is needed - standard SPI firmware drivers work directly with AD7689BCPZRL7.
Is AD7689BCPZRL7 pin-compatible with other members of the AD768x family?
AD7689BCPZRL7 shares the same 20-lead LFCSP package and pinout with AD7682BCPZRL7 (4-channel variant), enabling layout reuse across designs with different channel counts. Pin functions for VDD, REF, REFIN, GND, CNV, DIN, SCK, SDO, VIO, COM, and IN0–IN3 are identical; IN4–IN7 are active on AD7689BCPZRL7 but NC on AD7682BCPZRL7. No PCB changes are required when upgrading from AD7682 to AD7689.
AD7689BCPZRL7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- PulSAR®
- Package/Case:
- 20-WFQFN Exposed Pad, CSP
- Packaging:
- Tape & Reel (TR)
- 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:
- -
AD7689BCPZRL7 FAQ
1.How can I place an order for AD7689BCPZRL7 through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7689BCPZRL7 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 AD7689BCPZRL7 reliable?
The price and inventory of AD7689BCPZRL7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7689BCPZRL7 is usually 5 days.
3.What payment methods are accepted for AD7689BCPZRL7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7689BCPZRL7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7689BCPZRL7?
AD7689BCPZRL7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7689BCPZRL7 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 AD7689BCPZRL7?
For technical support, including AD7689BCPZRL7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7689BCPZRL7 requirements.
6.How does Aetrix verify that AD7689BCPZRL7 is sourced from the original manufacturer or authorized distributors?
All AD7689BCPZRL7 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 AD7689BCPZRL7 meets industry standards.
7.What is the process for return or replacement of AD7689BCPZRL7?
All AD7689BCPZRL7 units undergo pre-shipment inspection (PSI). If there is an issue with AD7689BCPZRL7, 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 AD7689BCPZRL7 part is unused and in its original packaging.
Return procedure for AD7689BCPZRL7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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