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Analog Devices Inc. AD7690BCPZ-R2
- Part No.:
- AD7690BCPZ-R2
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 10-VFDFN Exposed Pad, CSP
- Datasheet:
-
AD7690BCPZ-R2.pdf
- Description:
- IC ADC 18BIT 10LFCSP
- Quantity:
- Payment:
- Shipping:
Inventory:3,250
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Product details
Overview
AD7690BCPZ-R2 from Analog Devices is an 18-bit successive approximation register (SAR) analog-to-digital converter with true differential input, ±1.5 LSB INL max, 400 kSPS throughput, and single 5 V supply operation. It delivers 102 dB dynamic range at full speed and supports 1.8 V to 5 V logic via dedicated VIO pin - ideal for high-precision seismic data acquisition and portable instrumentation.
For engineers reviewing the AD7690BCPZ-R2 datasheet, AD7690BCPZ-R2 pinout, AD7690BCPZ-R2 application, or AD7690BCPZ-R2 equivalent, key selection criteria include its no-pipeline-delay architecture, daisy-chainable SPI-compatible serial interface, 1 nA standby current, and dual 10-lead LFCSP/MSOP package compatibility - all critical for low-power, multi-channel, space-constrained embedded measurement systems.
Technical Context
The AD7690BCPZ-R2 employs a charge redistribution capacitive DAC with on-chip track-and-hold, enabling zero-latency conversion and eliminating pipeline delay. Its differential input stage accepts ±VREF ranges up to ±5 V with 65 dB CMRR at 250 kHz and supports external reference voltages from 0.5 V to VDD.
Conversion is initiated by the CNV rising edge, triggering a self-clocked SAR process synchronized to the internal conversion clock - freeing SCK from timing-critical conversion control. The serial interface operates in CS or Chain mode, supporting daisy-chaining of multiple ADCs and optional busy indicator via SDI/SCK timing configuration.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 18-bit with no missing codes - guarantees monotonicity and unambiguous code mapping across full scale. |
| Throughput | 400 kSPS maximum - enables real-time sampling of signals up to ~190 kHz Nyquist bandwidth. |
| INL | ±1.5 LSB max (±6 ppm of FSR) - ensures <±12 µV error over ±5 V range, critical for calibration-grade accuracy. |
| Dynamic Range | 102 dB at 400 kSPS - supports >16-bit effective resolution in noisy industrial environments without oversampling. |
| Power Dissipation | 17–20 mW at 400 kSPS / 4.25 µW at 100 SPS - scales linearly with throughput for optimal energy efficiency in battery operation. |
| Reference Input | 0.5 V to VDD (up to 5.25 V) - allows flexible scaling from low-voltage sensor outputs to full ±5 V differential ranges. |
| Interface Logic | 1.8 V/2.5 V/3 V/5 V compatible via VIO pin - eliminates level-shifting circuitry when interfacing with mixed-voltage microcontrollers. |
Pinout & Package
The AD7690BCPZ-R2 is housed in a 10-lead 3 mm × 3 mm LFCSP (lead frame chip scale package) with exposed pad, rated for −40°C to +85°C operation. Pin numbering follows standard top-view orientation with Pin 1 at top-left corner.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - REF | Analog reference input | Accepts external reference voltage (0.5 V to VDD); requires local 10 µF decoupling for noise immunity and stability. |
| 2 - VDD | Analog power supply | 4.75 V to 5.25 V single supply; powers core ADC and internal reference buffer. |
| 3 - IN+ | Differential analog input (+) | True differential input; swings 0 V to VREF relative to IN−; common-mode range centered at VREF/2 ± 0.1 V. |
| 4 - IN− | Differential analog input (−) | Complements IN+; forms fully differential pair with matched input impedance and leakage <1 nA. |
| 5 - GND | Power ground | Primary analog ground return; exposed pad must be soldered to PCB ground plane for thermal and EMI performance. |
| 6 - CNV | Convert control input | Rising edge initiates conversion and selects interface mode (CS vs. Chain); also enables SDO output in CS mode when low. |
| 7 - SDO | Serial data output | 18-bit two's complement output, MSB-first, synchronized to SCK falling edge; tri-state controlled by CNV/SDI. |
| 8 - SCK | Serial clock input | Drives data readout timing; minimum period 15 ns (VIO > 4.5 V); not required for conversion execution. |
| 9 - SDI | Serial data input / mode select | Configures interface mode on CNV rising edge (low = Chain, high = CS); enables daisy-chain data forwarding. |
| 10 - VIO | Digital I/O supply | Independent 1.8 V to VDD supply for digital interface; sets logic thresholds and drives SDO/SDI levels. |
Key Features
| Feature | Design Value |
|---|---|
| No pipeline delay | Immediate data availability after conversion completes - essential for deterministic real-time control loops and multiplexed channel sequencing. |
| Oversampled dynamic range | 125 dB at 1 kSPS - enables 20-bit noise-free code resolution for ultra-low-noise DC measurements like strain gauge or thermocouple readouts. |
| Ultra-low standby current | 1 nA typical - extends battery life in sleep-wake sensor nodes where ADC remains powered but inactive between samples. |
| Daisy-chain capability | Single 3-wire bus supports multiple AD7690BCPZ-R2 units - reduces GPIO count and PCB routing complexity in multi-sensor systems. |
| True differential input architecture | ±VREF range with 65 dB CMRR at 250 kHz - rejects common-mode noise from motors, switching supplies, and long cable runs. |
Applications
| Seismic Data Acquisition | Portable DVMs |
|---|---|
|
Use Scenario: High-resolution digitization of low-amplitude geophone signals in battery-powered field equipment. IC Role / Device Role / Timing Role: Primary SAR ADC capturing 24-bit-equivalent precision via oversampling, with no latency-induced phase distortion. Use Value: 125 dB oversampled dynamic range enables detection of sub-microvolt seismic events while 1 nA standby current extends field deployment to >6 months on AA batteries. |
Use Scenario: Precision DC voltage measurement in handheld digital multimeters with auto-ranging and autoranging reference scaling. IC Role / Device Role / Timing Role: Core 18-bit ADC providing calibrated 6½-digit resolution using external 5 V reference and programmable gain amplifier front-end. Use Value: ±1.5 LSB INL and 102 dB dynamic range ensure traceable accuracy to 0.001% of reading, meeting IEC 61010 Class II safety and metrology requirements. |
| Medical Instrumentation | Battery-Powered Data Loggers |
|
Use Scenario: Low-noise acquisition of biopotential signals (ECG, EEG) in clinical-grade portable monitors. IC Role / Device Role / Timing Role: Differential input ADC rejecting 50/60 Hz mains interference and electrode half-cell offset drift via true differential topology. Use Value: 65 dB CMRR at 250 kHz and 1.8 V logic compatibility allow direct interfacing with ultra-low-power ARM Cortex-M MCUs, minimizing system BOM count. |
Use Scenario: Long-term environmental monitoring (temperature, humidity, pressure) in remote IoT nodes powered by coin-cell or solar harvesters. IC Role / Device Role / Timing Role: Energy-optimized ADC operating at 100 SPS with 4.25 µW dissipation, triggered by MCU wake-up interrupt. Use Value: Linear power scaling and 1 nA standby current reduce average system power to <1 µW during sleep, enabling >10-year operation on CR2032 cells. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-precision SAR ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD7691BCPZ-R2 | Same 18-bit resolution and 10-lead LFCSP package, but 100 kSPS max throughput and lower power (2.5 mW at 100 kSPS). | Better suited for ultra-low-power, lower-bandwidth applications where 400 kSPS is unnecessary. | Select AD7691BCPZ-R2 when system sampling rate ≤100 kSPS and sub-3 mW active power is prioritized over speed. |
| AD7982BRMZ | 18-bit, 1 MSPS, 10-lead MSOP, but requires external reference and has higher 32 mW power at full speed. | Targeted at higher-speed industrial PLC modules where throughput >400 kSPS justifies added power and board area. | Choose AD7982BRMZ only if ≥1 MSPS sampling is mandatory and external reference design flexibility outweighs AD7690BCPZ-R2's integrated simplicity. |
Compared with AD7691BCPZ-R2, the AD7690BCPZ-R2 delivers 4× higher throughput at modest power cost; versus AD7982BRMZ, it trades raw speed for lower power, smaller footprint, and reference integration - making it optimal for portable, precision, mid-speed measurement systems.
Availability
AD7690BCPZ-R2 is available at Aetrix Electronics and suitable for seismic data acquisition, portable DVMs, medical instrumentation, battery-powered data loggers, and precision industrial sensors requiring stable component supply and long-term manufacturability.
Supply support for AD7690BCPZ-R2 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, headquartered in Norwood, MA, with design and manufacturing expertise spanning precision data conversion, amplification, and power management.
The AD7690BCPZ-R2 belongs to Analog Devices' PulSAR® family of precision SAR ADCs, engineered specifically for high-resolution, low-power, low-latency measurement in portable, battery-operated, and space-constrained instrumentation systems.
FAQ
What is the maximum sampling rate supported by the AD7690BCPZ-R2?
The AD7690BCPZ-R2 supports a maximum throughput of 400 kSPS, corresponding to a minimum conversion cycle time of 2.5 µs. This enables accurate digitization of input signals with fundamental frequencies up to approximately 190 kHz under Nyquist criteria. At lower rates - such as 1 kSPS - the device achieves enhanced performance including 125 dB oversampled dynamic range and 20-bit noise-free code resolution.
Does the AD7690BCPZ-R2 require an external reference voltage?
Yes, the AD7690BCPZ-R2 requires an external reference voltage applied to the REF pin, which can range from 0.5 V to VDD (up to 5.25 V). The device does not include an internal reference; instead, it relies on a stable, low-noise external source - commonly a precision bandgap or series reference - to define full-scale range and ensure specified INL and gain accuracy.
Is the AD7690BCPZ-R2 pin-compatible with other PulSAR ADCs?
Yes, the AD7690BCPZ-R2 is pin-for-pin compatible with the AD7691 (100 kSPS), AD7982 (1 MSPS), AD7687 (16-bit, 250 kSPS), and AD7688 (16-bit, 400 kSPS) in both 10-lead MSOP and 10-lead LFCSP packages. This allows drop-in replacement within the same footprint when trade-offs between speed, resolution, and power are acceptable for the target application.
What digital interface modes does the AD7690BCPZ-R2 support?
The AD7690BCPZ-R2 supports two primary serial interface modes: CS mode (3- or 4-wire with chip select) and Chain mode (3-wire daisy-chain). Mode selection is determined by the SDI pin state at the CNV rising edge. Both modes are SPI/QSPI/MICROWIRE/DSP-compatible and include optional busy indicator functionality for precise timing control in multi-ADC systems.
How does the AD7690BCPZ-R2 achieve ultra-low standby current?
The AD7690BCPZ-R2 achieves 1 nA typical standby current by fully powering down internal circuitry - including the reference buffer, comparator, and DAC array - when not actively converting. This deep sleep state is entered automatically between conversions and is maintained until the next CNV rising edge triggers acquisition, making it ideal for duty-cycled battery-powered measurement nodes.
AD7690BCPZ-R2 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- PulSAR®
- Package/Case:
- 10-VFDFN Exposed Pad, CSP
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- Number of Bits:
- -
- Sampling Rate (Per Second):
- -
- Number of Inputs:
- -
- Input Type:
- -
- Data Interface:
- -
- Configuration:
- -
- Ratio - S/H:ADC:
- -
- Number of A/D Converters:
- -
- Architecture:
- -
- Reference Type:
- -
- Voltage - Supply, Analog:
- -
- Voltage - Supply, Digital:
- -
- Features:
- -
- Operating Temperature:
- -
- Supplier Device Package:
- 10-LFCSP-WD (3x3)
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
AD7690BCPZ-R2 FAQ
1.How can I place an order for AD7690BCPZ-R2 through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7690BCPZ-R2 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 AD7690BCPZ-R2 reliable?
The price and inventory of AD7690BCPZ-R2 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7690BCPZ-R2 is usually 5 days.
3.What payment methods are accepted for AD7690BCPZ-R2?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7690BCPZ-R2 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7690BCPZ-R2?
AD7690BCPZ-R2 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7690BCPZ-R2 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 AD7690BCPZ-R2?
For technical support, including AD7690BCPZ-R2 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7690BCPZ-R2 requirements.
6.How does Aetrix verify that AD7690BCPZ-R2 is sourced from the original manufacturer or authorized distributors?
All AD7690BCPZ-R2 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 AD7690BCPZ-R2 meets industry standards.
7.What is the process for return or replacement of AD7690BCPZ-R2?
All AD7690BCPZ-R2 units undergo pre-shipment inspection (PSI). If there is an issue with AD7690BCPZ-R2, 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 AD7690BCPZ-R2 part is unused and in its original packaging.
Return procedure for AD7690BCPZ-R2:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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