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Analog Devices Inc. AD7691BCPZ-R2
- Part No.:
- AD7691BCPZ-R2
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 10-VFDFN Exposed Pad, CSP
- Datasheet:
-
AD7691BCPZ-R2.pdf
- Description:
- 250 KSPS 18-BIT DIFFERENTIAL ADC
- Quantity:
- Payment:
- Shipping:
Inventory:1,863
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Product details
Overview
AD7691BCPZ-R2 from Analog Devices is an 18-bit, charge redistribution successive approximation register (SAR) analog-to-digital converter with true differential input, 250 kSPS throughput, ±0.75 LSB typical INL, and operation over −55°C to +105°C. It delivers 102 dB dynamic range and 101 dB SINAD at 1 kHz with 5 V reference, targeting high-precision data acquisition in harsh environments.
For engineers reviewing the AD7691BCPZ-R2 datasheet, AD7691BCPZ-R2 pinout, AD7691BCPZ-R2 application, or AD7691BCPZ-R2 equivalent, key selection considerations include its military-grade temperature range, no pipeline delay, SPI/QSPI/MICROWIRE-compatible serial interface, daisy-chain capability, and 1.8 V–5 V logic compatibility via separate VIO supply.
Technical Context
The AD7691BCPZ-R2 employs a charge redistribution SAR architecture with internal conversion clock and zero-latency sampling on the CNV rising edge. Its differential input accepts ±VREF full-scale range or unipolar 0 V to VREF, with common-mode rejection of 65 dB at 250 kHz and 2 MHz −3 dB input bandwidth.
It supports two interface modes-CS mode (with optional busy indicator) and chain mode (for multi-ADC daisy-chaining)-both synchronized to SCK and compatible with 1.8 V/2.5 V/3 V/5 V logic levels via dedicated VIO. Power scales linearly with throughput: 1.35 mW at 100 kSPS (2.5 V), 10.6 mW at 250 kSPS (5 V).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 18-bit with no missing codes - guarantees monotonicity and full code coverage for precision measurement systems. |
| Throughput | 250 kSPS maximum (VDD ≥ 4.5 V) - enables real-time capture of fast transients in seismic or instrumentation applications. |
| INL | ±0.75 LSB typical (−40°C to +85°C); −2.7/+2 LSB min/max (−55°C to +105°C) - defines absolute accuracy across extended military temperature range. |
| SINAD | 101 dB typical at fIN = 1 kHz, VREF = 5 V - supports >16.5 effective bits for low-noise signal conditioning. |
| Dynamic Range | 102 dB typical; 125 dB oversampled at 1 kSPS - enables high-resolution DC and low-frequency AC measurements with digital filtering. |
| Power Dissipation | 1.35 mW at 100 kSPS / 2.5 V; 10.6 mW at 250 kSPS / 5 V - allows scalable power budgeting in battery- or thermally constrained systems. |
| Reference Input | 0.5 V to VDD (up to 5.25 V); load current ≤60 µA at 250 kSPS - permits flexible external reference selection without buffering overhead. |
Pinout & Package
AD7691BCPZ-R2 is housed in a 10-lead MSOP (RM-10) package per JEDEC MO-187-BA, with 0.5 mm pitch, 3.0 mm × 3.0 mm body, and exposed pad for thermal performance. Pin 1 identifier located at top-left corner with 15° max chamfer.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 REF | Analog Reference Input | Accepts external reference from 0.5 V to VDD; requires local 10 µF decoupling for stable ADC accuracy. |
| 2 VDD | Analog/Digital Core Supply | 2.3 V to 5.25 V single supply; powers internal SAR core, reference buffer, and logic circuits. |
| 3 IN+ | Differential Positive Input | True differential input; swings 0 V to VREF centered at VREF/2, 180° out-of-phase with IN−. |
| 4 IN− | Differential Negative Input | Complements IN+; enables rejection of common-mode noise and even-order harmonics. |
| 5 GND | Power Ground | Common return for VDD, REF, and analog inputs; must be low-impedance and separated from digital ground where possible. |
| 6 CNV | Convert Control Input | Rising edge initiates conversion and selects interface mode (CS or chain); also enables SDO in CS mode when low. |
| 7 SDO | Serial Data Output | 18-bit twos-complement output synchronized to SCK falling edge; tri-state controlled by CNV/SDI in CS mode. |
| 8 SCK | Serial Clock Input | Drives data shift-out; timing varies with VIO level (15–40 ns period) to support mixed-voltage host interfaces. |
| 9 SDI | Serial Data Input | Configures interface mode on CNV edge (low = chain, high = CS); in chain mode, passes upstream data with 18-cycle delay. |
| 10 VIO | Digital I/O Supply | 1.8 V to VDD + 0.3 V; sets logic thresholds for SDI/SCK/SDO, enabling interoperability with diverse microcontrollers. |
Key Features
| Feature | Design Value |
|---|---|
| No pipeline delay | Immediate data availability after conversion completes - eliminates latency-induced phase errors in closed-loop control. |
| Daisy-chain capability | Single 3-wire bus supports multiple AD7691BCPZ-R2 units - reduces PCB routing complexity and host GPIO count in multi-channel systems. |
| Optional busy indicator | SDO asserts active-low busy signal during conversion in CS mode - simplifies timing management without polling or interrupts. |
| Military temperature range | −55°C to +105°C operation with controlled manufacturing baseline - meets AQEC requirements for defense/aerospace deployments. |
| Low standby current | 1 nA typical at 25°C - enables ultra-low-power wake-on-event architectures in battery-powered remote sensors. |
Applications
| Seismic Data Acquisition | Medical Instrumentation |
|---|---|
Use Scenario: High-fidelity digitization of low-amplitude geophone signals in downhole or array-based monitoring systems. IC Role / Device Role / Timing Role: Primary SAR ADC capturing 250 kSPS differential waveforms with 102 dB dynamic range and minimal harmonic distortion. Use Value: Enables detection of sub-millivolt seismic events under wide temperature extremes (−55°C to +105°C) without gain switching or calibration drift. |
Use Scenario: Precision analog front-end for portable ECG, EEG, or patient monitors requiring low noise and high linearity. IC Role / Device Role / Timing Role: 18-bit differential ADC converting biopotential signals with 101 dB SINAD and no missing codes for diagnostic-grade fidelity. Use Value: Supports 20-bit noise-free resolution at 1 kSPS, meeting IEC 60601-2-27 requirements for clinical waveform integrity. |
| Battery-Powered Test Equipment | Industrial Process Monitoring |
Use Scenario: Handheld multimeters, insulation testers, or field calibrators operating from single Li-ion cells. IC Role / Device Role / Timing Role: Low-power SAR ADC delivering 1.35 mW at 100 kSPS and 1.4 µW in standby - extends runtime while maintaining 18-bit accuracy. Use Value: Eliminates need for external voltage translators or level shifters via dual-supply VDD/VIO architecture (1.8 V logic compatible). |
Use Scenario: Distributed sensor nodes in oil/gas, power transmission, or factory automation measuring pressure, strain, or temperature. IC Role / Device Role / Timing Role: Ruggedized ADC interfacing with bridge sensors or RTDs, leveraging ±VREF differential input and 65 dB CMRR at 250 kHz. Use Value: Maintains ±0.75 LSB INL stability across −55°C to +105°C, reducing field recalibration frequency and improving long-term measurement confidence. |
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 |
|---|---|---|---|
| AD7690BCPZ-R2 | Pin-for-pin compatible 18-bit SAR ADC; identical package and interface but rated only for −40°C to +85°C industrial range. | Lacks military temperature qualification and enhanced product change notification; unsuitable for defense/aerospace deployments. | Select AD7690BCPZ-R2 only for cost-sensitive commercial applications where extended temperature operation is not required. |
| AD7693BCPZ-R2 | 16-bit SAR ADC in same 10-lead MSOP; shares pinout, interface, and power architecture but with reduced resolution and INL (±1.5 LSB). | Lower resolution limits dynamic range to ~96 dB; appropriate for applications prioritizing speed/power over ultimate precision. | Choose AD7693BCPZ-R2 when 16-bit accuracy suffices and system-level SNR budget allows 6 dB degradation versus AD7691BCPZ-R2. |
Compared with AD7690BCPZ-R2 and AD7693BCPZ-R2, the AD7691BCPZ-R2 uniquely combines 18-bit resolution, −55°C to +105°C operation, and no missing codes - making it the sole option among these three for mission-critical, wide-temperature, high-fidelity data acquisition.
Availability
AD7691BCPZ-R2 is available at Aetrix Electronics and suitable for seismic data acquisition, medical instrumentation, and battery-powered test equipment requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for AD7691BCPZ-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.
The AD7691BCPZ-R2 belongs to Analog Devices' PulSAR® family of precision SAR ADCs, designed specifically for high-resolution, low-latency data acquisition in demanding industrial, defense, and medical systems.
FAQ
What is the operating temperature range of the AD7691BCPZ-R2?
The AD7691BCPZ-R2 is specified for operation from −55°C to +105°C, meeting AQEC standards for defense and aerospace applications. This extended range is achieved through controlled manufacturing baseline, single assembly/test site, and enhanced product change notification - distinguishing it from commercial-grade variants like the AD7690BCPZ-R2.
Does the AD7691BCPZ-R2 require an external reference voltage?
Yes, the AD7691BCPZ-R2 requires an external reference applied to the REF pin, which accepts voltages from 0.5 V up to VDD (max 5.25 V). The device does not include an internal reference; using a stable, low-noise external reference such as the ADR4550 or REF195 is essential to achieve specified INL and SINAD performance.
Can multiple AD7691BCPZ-R2 devices be connected on a single serial bus?
Yes, the AD7691BCPZ-R2 supports daisy-chain configuration via its SDI and SDO pins. When SDI is low at the CNV rising edge, the device enters chain mode: conversion results from multiple AD7691BCPZ-R2 units are serialized onto one SDO line with 18-cycle inter-device delay, minimizing host interface resource usage.
What logic voltage levels does the AD7691BCPZ-R2 support for digital communication?
The AD7691BCPZ-R2 supports 1.8 V, 2.5 V, 3 V, and 5 V logic interfaces via its dedicated VIO supply pin. Digital input thresholds scale with VIO (VIH = 0.7 × VIO, VIL = 0.3 × VIO), and SDO output swing is referenced to VIO - enabling direct connection to mixed-voltage microcontrollers without level-shifting circuitry.
How does power consumption scale with throughput in the AD7691BCPZ-R2?
Power dissipation in the AD7691BCPZ-R2 scales linearly with throughput: 1.35 mW at 100 kSPS / 2.5 V, 4.24 mW at 100 kSPS / 5 V, and 10.6 mW at 250 kSPS / 5 V. At ultra-low rates (100 SPS), power drops to 1.4 µW - supporting energy harvesting or battery-life-critical applications.
AD7691BCPZ-R2 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- PulSAR®
- Package/Case:
- 10-VFDFN Exposed Pad, CSP
- Packaging:
- Bulk
- Product Status:
- Active
- Number of Bits:
- 18
- Sampling Rate (Per Second):
- 250k
- Number of Inputs:
- 1
- Input Type:
- Differential
- Data Interface:
- DSP, MICROWIRE™, QSPI™, and SPI™
- Configuration:
- ADC
- Ratio - S/H:ADC:
- 0:1
- Number of A/D Converters:
- 1
- Architecture:
- SAR
- Reference Type:
- External
- Voltage - Supply, Analog:
- 2.3V ~ 5.25V
- Voltage - Supply, Digital:
- 2.3V ~ 5.25V
- Features:
- -
- Operating Temperature:
- -40°C ~ 85°C
- Supplier Device Package:
- 10-LFCSP-WD (3x3)
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
AD7691BCPZ-R2 FAQ
1.How can I place an order for AD7691BCPZ-R2 through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7691BCPZ-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 AD7691BCPZ-R2 reliable?
The price and inventory of AD7691BCPZ-R2 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7691BCPZ-R2 is usually 5 days.
3.What payment methods are accepted for AD7691BCPZ-R2?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7691BCPZ-R2 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7691BCPZ-R2?
AD7691BCPZ-R2 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7691BCPZ-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 AD7691BCPZ-R2?
For technical support, including AD7691BCPZ-R2 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7691BCPZ-R2 requirements.
6.How does Aetrix verify that AD7691BCPZ-R2 is sourced from the original manufacturer or authorized distributors?
All AD7691BCPZ-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 AD7691BCPZ-R2 meets industry standards.
7.What is the process for return or replacement of AD7691BCPZ-R2?
All AD7691BCPZ-R2 units undergo pre-shipment inspection (PSI). If there is an issue with AD7691BCPZ-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 AD7691BCPZ-R2 part is unused and in its original packaging.
Return procedure for AD7691BCPZ-R2:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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