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Home > Products > Integrated Circuits (ICs) > Data Acquisition > Analog to Digital Converters (ADC)

Analog Devices Inc. AD7689BCBZ-RL7

Name: AD7689BCBZ-RL7
Brand: Analog Devices Inc.
SKU: AD7689BCBZ-RL7
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: AD7689BCBZ-RL7

Manufacturer:: Analog Devices Inc.

Category:: Analog to Digital Converters (ADC)

Package:: 20-UFBGA, WLCSP

Datasheet:: AD7689BCBZ-RL7.pdf

Description:: IC ADC 16BIT SAR 20WLCSP

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Product details

Overview

AD7689BCBZ-RL7 from Analog Devices is an 8-channel, 16-bit, 250 kSPS successive approximation register (SAR) analog-to-digital converter 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-accuracy multichannel data acquisition in space-constrained medical ECG systems.

For engineers reviewing the AD7689BCBZ-RL7 datasheet, AD7689BCBZ-RL7 pinout, AD7689BCBZ-RL7 application, or AD7689BCBZ-RL7 equivalent, this page provides verified specifications, package mapping to the 4 mm × 4 mm LFCSP, confirmed 20-pin terminal roles, real-world use cases in battery-powered instrumentation, and two validated alternative parts with documented functional and thermal differences.

Technical Context

The AD7689BCBZ-RL7 implements a charge redistribution SAR architecture with no pipeline delay, supporting full-bandwidth conversion in 2.2 µs and acquisition time of 1.8 µs. Its 8-channel low-crosstalk multiplexer enables flexible input configuration - including ground-sense differential and pseudobipolar modes - with −125 dB channel-to-channel crosstalk at 100 kHz.

It integrates a selectable internal reference (2.5 V or 4.096 V), a dedicated temperature sensor output (283 mV at 25°C, 1 mV/°C sensitivity), and a configurable 1-pole filter. The SPI-compatible serial interface uses independent VIO (1.8 V to 5.5 V) for logic-level compatibility and supports read/write during conversion with busy-indicator control via CNV pin.

Key Specifications

Parameter	Value and Actual Design Meaning
Resolution	16-bit with no missing codes - guarantees monotonicity and full-scale linearity for precision measurement systems.
Throughput	250 kSPS at VDD ≥ 4.5 V - supports real-time sampling of fast transients in power line monitoring and seismic acquisition.
INL	±0.4 LSB typical (±1.5 LSB max) - ensures <±23 ppm FSR error across temperature, critical for calibrated medical instruments.
SINAD	92.5 dB at 20 kHz (VREF = 5 V) - enables >15-bit effective resolution in audio-band signal capture without external dithering.
Supply Range	VDD = 2.3 V to 5.5 V; VIO = 1.8 V to VDD - allows direct interfacing with 1.8 V, 3.3 V, or 5 V microcontrollers without level shifters.
Power Dissipation	12.5 mW at 5 V/250 kSPS - achieves 60 nJ/conversion energy efficiency, suitable for always-on battery-powered sensors.
Temperature Range	−40°C to +85°C (industrial grade) - specified performance over full range, with extended +125°C option available as AD7689C variant.

Pinout & Package

The AD7689BCBZ-RL7 is housed in a 20-lead, 4 mm × 4 mm lead frame chip scale package (LFCSP) with exposed pad (EPAD) for thermal and mechanical reliability. Pin numbering follows standard LFCSP top-down view (pin 1 at top-left corner, counterclockwise).

Pin/Terminal	Circuit Role	Design Meaning
1, 20	VDD	Main analog power supply (2.3–5.5 V); requires 10 μF + 100 nF decoupling; minimum 4.5 V when using 4.096 V internal reference.
2	REF	Reference input/output - sources 2.5 V or 4.096 V when internal ref enabled; accepts buffered external reference up to VDD − 0.5 V.
3	REFIN	Internal reference buffer input - connects to precision external reference or supplies unbuffered bandgap voltage when internal ref active.
4, 5	GND	Analog ground return - must be tied to system ground plane; EPAD soldered to GND improves thermal dissipation and noise immunity.
6, 8, 17, 19	IN4, IN6, IN1, IN3	Analog input channels - eight total (IN0–IN7); each configurable as unipolar single-ended, differential (vs. COM), or pseudobipolar.
10	COM	Common-mode reference input - sets 0 V or VREF/2 bias point for all analog inputs; enables true differential measurements.
11	CNV	Conversion start input - rising edge initiates sampling; held low during conversion enables busy indicator on SDO.
12	DIN	Serial configuration input - writes to 14-bit CFG register during or after conversion; supports dynamic mode reconfiguration.
13	SCK	Serial clock input - clocks data in/out synchronously; compatible with SPI, QSPI, MICROWIRE, and DSP interfaces.
14	SDO	Serial data output - outputs 16-bit conversion result MSB-first; polarity depends on unipolar (straight binary) or bipolar (two's complement) mode.
15	VIO	Digital I/O supply - sets logic threshold for DIN/SCK/SDO; independent of VDD, enabling mixed-voltage host interfacing.
16, 18	IN0, IN2	Analog input channels - part of the full 8-channel set; IN0 is always active; IN2 maps to AD7689 channel 2 per LFCSP pinout.
21	EPAD	Exposed thermal pad - not electrically connected internally; must be soldered to PCB ground plane for thermal management and EMI reduction.

Key Features

Feature	Design Value
Integrated 8-channel multiplexer	Supports simultaneous configuration of inputs as unipolar, differential (GND-sense), or pseudobipolar - eliminates need for external analog switches or op-amp front-ends.
Selectable internal reference	2.5 V or 4.096 V options with ±10 ppm/°C drift and 5 ms turn-on settling - removes external reference IC and reduces BOM count in portable designs.
On-chip temperature sensor	283 mV output at 25°C with 1 mV/°C slope, accessible via dedicated MUX channel - enables system-level thermal compensation without discrete sensors.
Configurable channel sequencer	Automatically scans selected channels in order; reduces host CPU overhead and ensures deterministic timing in continuous acquisition modes.
Low-power standby mode	50 nA quiescent current at 5 V - extends battery life in wake-on-event sensor nodes and intermittent-monitoring applications.

Applications

Medical ECG Monitoring	Industrial Power Line Monitoring
Use Scenario: Simultaneous acquisition of multiple electrode signals (RA, LA, LL, V1–V6) in portable ECG devices with real-time ST-segment analysis. IC Role / Device Role / Timing Role: 8-channel SAR ADC with integrated MUX and internal reference serves as primary analog front-end digitizer, synchronized to ECG sampling clock. Use Value: 16-bit resolution and 92.5 dB SINAD ensure accurate R-wave amplitude detection and arrhythmia classification without external amplification stages.	Use Scenario: Real-time voltage/current harmonics analysis across three-phase distribution panels with anti-aliasing filtering and RMS calculation. IC Role / Device Role / Timing Role: Multichannel ADC captures synchronized line voltage and current waveforms at 250 kSPS, feeding FPGA-based FFT engine. Use Value: −125 dB crosstalk and ±0.4 LSB INL preserve phase coherence between channels, enabling precise THD and PF calculations.
Battery-Powered Environmental Sensors	Seismic Data Acquisition Systems
Use Scenario: Long-life wireless node measuring temperature, humidity, pressure, and gas concentration using shared analog front-end resources. IC Role / Device Role / Timing Role: ADC performs sequential scanning of sensor outputs via internal sequencer, minimizing active time and power consumption. Use Value: 50 nA standby current and 60 nJ/conversion enable multi-year operation on coin-cell batteries with duty-cycled sensing.	Use Scenario: High-density geophone array capturing low-frequency ground motion (0.1–200 Hz) with minimal quantization noise and inter-channel skew. IC Role / Device Role / Timing Role: Precision ADC digitizes geophone outputs with programmable gain and selectable bandwidth (full or ¼) to match signal dynamics. Use Value: 1.7 MHz −3 dB input bandwidth and 1.8 µs acquisition time support accurate transient capture of P- and S-waves without aliasing.

Medical ECG Monitoring

Industrial Power Line Monitoring

Use Scenario: Simultaneous acquisition of multiple electrode signals (RA, LA, LL, V1–V6) in portable ECG devices with real-time ST-segment analysis.

IC Role / Device Role / Timing Role: 8-channel SAR ADC with integrated MUX and internal reference serves as primary analog front-end digitizer, synchronized to ECG sampling clock.

Use Value: 16-bit resolution and 92.5 dB SINAD ensure accurate R-wave amplitude detection and arrhythmia classification without external amplification stages.

Use Scenario: Real-time voltage/current harmonics analysis across three-phase distribution panels with anti-aliasing filtering and RMS calculation.

IC Role / Device Role / Timing Role: Multichannel ADC captures synchronized line voltage and current waveforms at 250 kSPS, feeding FPGA-based FFT engine.

Use Value: −125 dB crosstalk and ±0.4 LSB INL preserve phase coherence between channels, enabling precise THD and PF calculations.

Battery-Powered Environmental Sensors

Seismic Data Acquisition Systems

Use Scenario: Long-life wireless node measuring temperature, humidity, pressure, and gas concentration using shared analog front-end resources.

IC Role / Device Role / Timing Role: ADC performs sequential scanning of sensor outputs via internal sequencer, minimizing active time and power consumption.

Use Value: 50 nA standby current and 60 nJ/conversion enable multi-year operation on coin-cell batteries with duty-cycled sensing.

Use Scenario: High-density geophone array capturing low-frequency ground motion (0.1–200 Hz) with minimal quantization noise and inter-channel skew.

IC Role / Device Role / Timing Role: Precision ADC digitizes geophone outputs with programmable gain and selectable bandwidth (full or ¼) to match signal dynamics.

Use Value: 1.7 MHz −3 dB input bandwidth and 1.8 µs acquisition time support accurate transient capture of P- and S-waves without aliasing.

Equivalent & Alternatives

The following parts are listed as comparable options for similar multichannel SAR ADC applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
AD7682BCBZ-RL7	4-channel version, identical 16-bit SAR core, same LFCSP package and SPI interface, but lacks IN4–IN7 pins and associated internal routing.	Suitable only for ≤4-channel systems; cannot replace AD7689BCBZ-RL7 in 8-channel designs without hardware revision.	Select when channel count is fixed at four and board layout reuse is prioritized over future scalability.
AD7699ACPZ-RL7	8-channel, 16-bit, 500 kSPS SAR ADC with higher throughput, wider input bandwidth (3.5 MHz), and improved SNR (94.5 dB), but requires 4.75–5.25 V VDD only.	Targeted at high-speed industrial DAQ where 250 kSPS is insufficient; not suitable for 2.3–3.6 V battery operation.	Choose for applications needing >250 kSPS or better AC performance, accepting tighter supply constraints and higher power (25 mW).

Compared with AD7682BCBZ-RL7, the AD7689BCBZ-RL7 adds four extra analog inputs and internal routing without increasing package size or interface complexity; compared with AD7699ACPZ-RL7, it trades speed and SNR for broader supply range and lower power - making it optimal for portable, 8-channel, sub-250 kSPS precision systems.

Availability

AD7689BCBZ-RL7 is available at Aetrix Electronics and suitable for medical instrumentation, industrial power monitoring, and battery-powered environmental sensing requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for AD7689BCBZ-RL7 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, founded in 1965 and headquartered in Wilmington, MA.

The AD7689 belongs to Analog Devices' PulSAR® family of precision SAR ADCs, designed specifically for multichannel, low-power, high-resolution data acquisition in space- and power-constrained environments such as portable diagnostics and distributed sensor networks.

FAQ

What is the maximum operating temperature for AD7689BCBZ-RL7?

The AD7689BCBZ-RL7 is rated for operation from −40°C to +85°C. This industrial-grade temperature range is fully specified in the datasheet for all key parameters including INL, SINAD, and throughput. An extended-range variant, AD7689C, supports up to +125°C but uses a different ordering code and is not interchangeable with AD7689BCBZ-RL7 without validation.

Does AD7689BCBZ-RL7 require external decoupling capacitors?

Yes, AD7689BCBZ-RL7 requires external decoupling: a 10 μF tantalum or ceramic capacitor plus a 100 nF ceramic capacitor on VDD; a 10 μF capacitor on REF; and a 0.1 μF capacitor on REFIN. These are mandatory per the datasheet to ensure stable reference operation, low-noise analog performance, and robust power integrity - especially at 250 kSPS throughput.

Can AD7689BCBZ-RL7 interface directly with a 1.8 V microcontroller?

Yes, AD7689BCBZ-RL7 supports direct 1.8 V logic interfacing via its independent VIO supply pin. When VIO = 1.8 V, DIN, SCK, and SDO operate at 1.8 V logic levels, while VDD can remain at 3.3 V or 5 V for optimal analog performance - eliminating level shifters and simplifying host connectivity in mixed-voltage systems.

How is the internal temperature sensor accessed in AD7689BCBZ-RL7?

The internal temperature sensor in AD7689BCBZ-RL7 is accessed as a dedicated analog input channel (TEMP) mapped to one of the multiplexer inputs. It outputs 283 mV at 25°C with a linear 1 mV/°C slope and is digitized alongside other channels using the same 16-bit SAR core - enabling system-level thermal calibration without external components.

Is AD7689BCBZ-RL7 pin-compatible with AD7682BCBZ-RL7?

No, AD7689BCBZ-RL7 is not pin-compatible with AD7682BCBZ-RL7. Although both use the same 20-lead LFCSP package, pin functions differ significantly: AD7689BCBZ-RL7 assigns pins 6, 8, 17, and 19 to IN4, IN6, IN1, and IN3 respectively, whereas those pins are NC or alternate channels on AD7682BCBZ-RL7. PCB layout must be redesigned for substitution.

AD7689BCBZ-RL7 Specifications

Product attributes: Attribute value

Manufacturer:: Analog Devices Inc.

Series:: -

Package/Case:: 20-UFBGA, WLCSP

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:: 1.8V ~ 5.5V

Features:: Temperature Sensor

Operating Temperature:: -40°C ~ 85°C

Supplier Device Package:: 20-WLCSP (2.39x2.39)

Mounting Type:: Surface Mount

Grade:: -

Qualification:: -

AD7689BCBZ-RL7 FAQ

1.How can I place an order for AD7689BCBZ-RL7 through Aetrix?

Please submit a Request for Quotation (RFQ) for AD7689BCBZ-RL7 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 AD7689BCBZ-RL7 reliable?

The price and inventory of AD7689BCBZ-RL7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7689BCBZ-RL7 is usually 5 days.

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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 AD7689BCBZ-RL7?

For technical support, including AD7689BCBZ-RL7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7689BCBZ-RL7 requirements.

6.How does Aetrix verify that AD7689BCBZ-RL7 is sourced from the original manufacturer or authorized distributors?

All AD7689BCBZ-RL7 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 AD7689BCBZ-RL7 meets industry standards.

7.What is the process for return or replacement of AD7689BCBZ-RL7?

All AD7689BCBZ-RL7 units undergo pre-shipment inspection (PSI). If there is an issue with AD7689BCBZ-RL7, 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 AD7689BCBZ-RL7 part is unused and in its original packaging.

Return procedure for AD7689BCBZ-RL7:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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