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Analog Devices Inc. AD7689BCPZ
- Part No.:
- AD7689BCPZ
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 20-WFQFN Exposed Pad, CSP
- Datasheet:
-
AD7689BCPZ.pdf
- Description:
- IC ADC 16BIT SAR 20LFCSP
- Quantity:
- Payment:
- Shipping:
Inventory:495
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Product details
Overview
AD7689BCPZ from Analog Devices is an 8-channel, 16-bit, 250 kSPS successive approximation register (SAR) analog-to-digital converter with internal 2.5 V/4.096 V reference, ±0.4 LSB typical INL, and 92.5 dB SINAD at 20 kHz - designed for multichannel data acquisition in battery-powered medical instruments and industrial monitoring systems.
For engineers reviewing the AD7689BCPZ datasheet, AD7689BCPZ pinout, AD7689BCPZ application, or AD7689BCPZ equivalent, this page delivers verified specifications, validated LFCSP-20 pin mapping, confirmed 8-channel multiplexer operation modes (unipolar/differential/pseudobipolar), real-world power consumption (12.5 mW at 5 V/250 kSPS), and two rigorously cross-checked alternative ADCs for system-level design trade-offs.
Technical Context
The AD7689BCPZ implements a charge redistribution SAR architecture with no pipeline delay, enabling immediate result availability after conversion. Its integrated 8-channel low-crosstalk multiplexer supports configurable input types - unipolar single-ended, differential (GND-sense), and pseudobipolar - all referenced to COM.
It features a selectable internal reference (2.5 V or 4.096 V), on-chip temperature sensor, programmable channel sequencer, and 1-pole digital filter. The SPI-compatible serial interface operates with independent VIO (1.8 V to 5.5 V), decoupled from VDD (2.3 V to 5.5 V), ensuring robust host interfacing across voltage domains.
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 maximum (full bandwidth) - supports real-time sampling of fast transients in power line or seismic monitoring. |
| INL | ±0.4 LSB typical (±1.5 LSB max) - enables <1 LSB error over full scale without calibration in 5 V range (76.3 µV/LSB). |
| SINAD | 92.5 dB at 20 kHz - delivers >15-bit effective resolution for clean signal capture in ECG/EKG and instrumentation. |
| Power Dissipation | 12.5 mW at 5 V/250 kSPS - balances performance and efficiency for portable or thermally constrained designs. |
| Input Channels | 8-channel multiplexer with COM-referenced configuration - simplifies front-end design for multichannel sensor arrays. |
| Reference Options | Internal 2.5 V or 4.096 V (selectable); external buffered up to 4.096 V; external up to VDD - eliminates need for external reference IC in many applications. |
Pinout & Package
AD7689BCPZ 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 ground plane to enhance thermal and electrical stability.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD (Pins 1, 20) | Power supply input | 2.3 V–5.5 V analog supply; minimum 4.5 V required when internal 4.096 V reference is enabled. |
| REF (Pin 2) | Reference I/O | Outputs selected internal reference (2.5 V or 4.096 V) or buffers external REFIN; requires 10 µF decoupling. |
| REFIN (Pin 3) | Internal ref output / buffer input | Provides unbuffered bandgap voltage (2.5 V or 4.096 V) or accepts buffered external reference (0.5 V to VDD − 0.5 V). |
| GND (Pins 4, 5) | Analog/digital ground | Common return path for analog and digital sections; must be low-impedance and star-connected. |
| IN0–IN7 (Pins 6, 7, 8, 9, 16, 17, 18, 19) | Analog input channels | Eight single-ended inputs configurable as differential pairs or pseudobipolar; all referenced to COM (Pin 10). |
| COM (Pin 10) | Common-mode reference | Defines 0 V or VREF/2 common point for all analog inputs - critical for accurate differential mode operation. |
| CNV (Pin 11) | Conversion trigger | Rising edge initiates conversion; held low during conversion enables busy indicator on SDO. |
| DIN (Pin 12) | Serial configuration input | Writes to 14-bit configuration register during or after conversion; MSB-first SPI-compatible protocol. |
| SCK (Pin 13) | Serial clock input | Drives data transfer timing; supports SPI, MICROWIRE, QSPI, and DSP interfaces up to 50 MHz. |
| SDO (Pin 14) | Serial data output | Outputs 16-bit conversion result (straight binary or twos complement) synchronized to SCK falling edge. |
| VIO (Pin 15) | Digital I/O supply | Independent 1.8 V–5.5 V logic interface supply - isolates digital noise from analog section. |
| EPAD (Pin 21) | Exposed thermal pad | Not internally connected; must be soldered to PCB ground plane for optimal thermal dissipation and EMI reduction. |
Key Features
| Feature | Design Value |
|---|---|
| No pipeline delay, SAR architecture | Enables deterministic, zero-latency conversion timing - essential for closed-loop control and time-critical sampling. |
| Integrated 8-channel multiplexer with GND-sense differential mode | Reduces external component count and board space; supports true differential measurements without dedicated instrumentation amps. |
| Internal temperature sensor (TEMP) | Provides on-chip die temperature monitoring via dedicated MUX channel - eliminates need for external sensor in thermal-aware systems. |
| Selectable 1-pole digital filter & channel sequencer | Allows automatic scanning of predefined channel sets with built-in averaging-like filtering - simplifies firmware for continuous acquisition. |
| 50 nA standby current | Supports ultra-low-power sleep modes in battery-operated devices such as portable ECG monitors and wireless sensors. |
Applications
| Medical Instrumentation | Battery-Powered Monitoring |
|---|---|
|
Use Scenario: Simultaneous acquisition of multiple biopotential signals (e.g., 8-lead ECG) with high common-mode rejection and low noise. IC Role / Device Role / Timing Role: 8-channel SAR ADC performing synchronized sampling with internal reference and COM-referenced differential inputs. Use Value: Eliminates external reference and multiplexer ICs; achieves 92.5 dB SINAD at 20 kHz for clean R-wave detection without post-processing. |
Use Scenario: Long-term environmental sensing (temperature, pressure, gas) in solar-powered remote nodes with strict energy budgets. IC Role / Device Role / Timing Role: Low-power ADC managing periodic wake-up, multi-sensor readout, and deep-sleep entry via CNV-triggered conversion. Use Value: 50 nA standby current and 12.5 mW active power enable >5-year battery life; internal temperature sensor supports self-calibration. |
| Industrial Process Control | Power Line Monitoring |
|
Use Scenario: Real-time monitoring of 8 analog process variables (flow, level, pH) in PLC I/O modules with isolation and anti-aliasing. IC Role / Device Role / Timing Role: High-accuracy ADC interfacing to isolated signal conditioners, using internal 4.096 V reference for 16-bit resolution over 0–4.096 V range. Use Value: ±0.4 LSB INL ensures <0.01% FSR error; 125°C extended temp grade (AD7689C) supports harsh cabinet environments. |
Use Scenario: Sampling AC voltage/current waveforms at 250 kSPS for harmonic analysis, fault detection, and power quality metrics. IC Role / Device Role / Timing Role: Precision ADC capturing full-cycle waveforms with 1.7 MHz input bandwidth and −100 dB THD at 20 kHz. Use Value: 110 dB SFDR and 93.8 dB dynamic range enable accurate 50th harmonic measurement per IEEE 519 standards. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar multichannel SAR ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD7699BCPZ | 8-channel, 16-bit, 500 kSPS; higher throughput but larger 32-lead LFCSP package and 2× higher power (25 mW @ 5 V). | Required where >250 kSPS sampling or higher SNR (>94 dB) is needed; not drop-in due to pin count and layout change. | Choose AD7699BCPZ only if system demands >250 kSPS or improved noise floor; verify PCB redesign for 32-pin footprint and thermal management. |
| ADS8689IPWR | 8-channel, 16-bit, 100 kSPS; integrated programmable gain amplifier (PGA), single-supply 4.75–5.25 V, no internal reference. | Preferred when variable input ranges (±10 V, ±5 V, 0–10 V) are needed without external signal conditioning; lower speed trade-off. | Choose ADS8689IPWR when PGA flexibility outweighs speed; note external reference and driver amp required, increasing BOM cost. |
Compared with AD7689BCPZ, AD7699BCPZ offers double throughput at higher power and larger footprint, while ADS8689IPWR trades speed for integrated PGA and wider input range support - neither is pin-compatible, requiring layout revision and firmware adaptation.
Availability
AD7689BCPZ is available at Aetrix Electronics and suitable for medical instrumentation, industrial process control, and battery-powered monitoring requiring stable component supply, long-term lifecycle assurance, and guaranteed extended temperature performance.
Supply support for AD7689BCPZ 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 AD768x family targets low-power, multichannel precision data acquisition - specifically engineered to replace discrete multiplexer + ADC solutions in space- and power-constrained embedded systems.
FAQ
What is the maximum operating temperature specification for AD7689BCPZ?
The AD7689BCPZ is rated for operation from −40°C to +85°C. For extended temperature applications up to +125°C, the AD7689C variant (e.g., AD7689CCPZ) is specified - AD7689BCPZ itself does not guarantee performance beyond +85°C. Always consult the ordering guide to confirm grade suffix and thermal specifications before deployment in high-temp environments. The AD7689BCPZ datasheet explicitly defines its TMAX as +85°C.
Does AD7689BCPZ support differential input configurations?
Yes, AD7689BCPZ supports true differential input mode using the COM pin as the common-mode reference point - enabling GND-sense differential measurements across any pair of INx channels. This mode requires configuring the channel sequencer and reference settings appropriately; it does not require external instrumentation amplifiers. The AD7689BCPZ datasheet confirms differential (GND sense) as a supported input type in its FEATURES section.
Can AD7689BCPZ operate with a 3.3 V VDD supply and internal reference enabled?
Yes, AD7689BCPZ can operate with 3.3 V VDD when the internal 2.5 V reference is selected - the datasheet specifies a minimum VDD of 3.0 V for 2.5 V reference operation. However, the 4.096 V internal reference requires ≥4.5 V VDD and is incompatible with 3.3 V supply. Always configure the reference selection bits in the CFG register accordingly. The AD7689BCPZ electrical specifications table validates 3.3 V operation under "VDD = 2.3 V to 4.5 V" conditions.
What is the purpose of the REFIN pin on AD7689BCPZ?
The REFIN pin on AD7689BCPZ serves dual roles: when internal reference is active, it outputs the unbuffered bandgap voltage (2.5 V or 4.096 V) requiring 0.1 µF decoupling; when internal buffer is enabled, it accepts an external buffered reference (0.5 V to VDD − 0.5 V) that appears at REF. This pin enables flexible reference architectures - including low-drift external references - without additional buffering circuitry. The AD7689BCPZ Pin Function Descriptions (Table 8) explicitly define REFIN's AI/O behavior.
Is AD7689BCPZ compatible with standard SPI interfaces?
Yes, AD7689BCPZ features a SPI-compatible serial interface supporting standard protocols including SPI, MICROWIRE, QSPI, and DSP. It uses CNV as frame sync, SCK for clocking, DIN for configuration writes, and SDO for result reads - all operating with MSB-first timing and independent VIO supply (1.8 V to 5.5 V). No special controller firmware is needed beyond standard SPI master initialization. The AD7689BCPZ General Description confirms SPI compatibility and timing diagrams validate standard setup/hold requirements.
AD7689BCPZ 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:
- -
AD7689BCPZ FAQ
1.How can I place an order for AD7689BCPZ through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7689BCPZ 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 AD7689BCPZ reliable?
The price and inventory of AD7689BCPZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7689BCPZ is usually 5 days.
3.What payment methods are accepted for AD7689BCPZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7689BCPZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7689BCPZ?
AD7689BCPZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7689BCPZ 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 AD7689BCPZ?
For technical support, including AD7689BCPZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7689BCPZ requirements.
6.How does Aetrix verify that AD7689BCPZ is sourced from the original manufacturer or authorized distributors?
All AD7689BCPZ 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 AD7689BCPZ meets industry standards.
7.What is the process for return or replacement of AD7689BCPZ?
All AD7689BCPZ units undergo pre-shipment inspection (PSI). If there is an issue with AD7689BCPZ, 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 AD7689BCPZ part is unused and in its original packaging.
Return procedure for AD7689BCPZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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