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Analog Devices Inc. AD7691BRMZ-RL7
- Part No.:
- AD7691BRMZ-RL7
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
AD7691BRMZ-RL7.pdf
- Description:
- IC ADC 18BIT SAR 10MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:5,653
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Product details
Overview
AD7691BRMZ-RL7 from Analog Devices is an 18-bit, charge redistribution successive approximation register (SAR) analog-to-digital converter with true differential input, ±1.5 LSB INL max, 250 kSPS throughput, and single-supply operation from 2.3 V to 5.25 V. It delivers 102 dB typical dynamic range at full speed and supports battery-powered instrumentation requiring high resolution without missing codes.
For engineers reviewing the AD7691BRMZ-RL7 datasheet, AD7691BRMZ-RL7 pinout, AD7691BRMZ-RL7 application, or AD7691BRMZ-RL7 equivalent, this page provides verified specifications, package mapping to MSOP-10 and LFCSP-10, real-world timing behavior, interface compatibility with SPI/QSPI/MICROWIRE, and validated alternative options for precision data acquisition systems.
Technical Context
The AD7691BRMZ-RL7 implements a track-and-hold SAR architecture with no pipeline delay, enabling immediate conversion result availability after CNV rising edge. Its proprietary serial interface supports both CS mode (3- or 4-wire) and daisy-chain mode, with optional busy indicator and 1.8 V–5 V logic compatibility via dedicated VIO supply.
It accepts true differential analog inputs spanning ±VREF with common-mode range centered at VREF/2, and features internal conversion clocking, low leakage (<1 nA), and 2 MHz −3 dB input bandwidth. Power scales linearly with throughput: 1.35 mW at 2.5 V/100 kSPS, 10.6 mW at 5 V/250 kSPS.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 18-bit with no missing codes - guarantees monotonicity and unambiguous digital representation across full scale. |
| Throughput | 250 kSPS maximum at VDD ≥ 4.5 V - enables real-time capture of signals up to ~100 kHz Nyquist bandwidth. |
| INL | ±1.5 LSB maximum - ensures absolute accuracy ≤ ±6 ppm of FSR, critical for calibration-sensitive instrumentation. |
| Differential Input Range | ±VREF with VREF up to VDD - supports flexible reference selection (e.g., 2.5 V or 5 V) and rail-to-rail analog signal swing. |
| Power Dissipation | 1.35 mW at 2.5 V/100 kSPS - enables ultra-low-power operation in portable seismic or medical devices. |
| Interface Compatibility | SPI/QSPI/MICROWIRE/DSP - allows direct connection to FPGA, MCU, or DSP without level-shifting or protocol translation. |
| Operating Temperature | −40°C to +85°C - qualified for industrial and field-deployed data acquisition environments. |
Pinout & Package
The AD7691BRMZ-RL7 is available in two 10-lead packages: 3 mm × 3 mm LFCSP (pin-compatible with SOT-23 footprint) and narrow-body MSOP-10. Both packages feature exposed thermal pad recommended for soldering to ground plane.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| REF | Analog reference input | Accepts external reference from 0.5 V to VDD; requires local 10 µF decoupling for stable conversion accuracy. |
| VDD | Analog power supply | 2.3 V–5.25 V single supply; powers core ADC and internal track-and-hold circuitry. |
| IN+, IN− | Differential analog inputs | True differential pair with 180° phase relationship; common-mode range = VREF/2 ± 0.1 V. |
| GND | Power ground | Reference node for analog and digital sections; must be low-impedance and separated from noisy digital return paths. |
| CNV | Convert control input | Rising edge initiates sampling; also selects interface mode (CS vs. chain) based on SDI state at edge. |
| SDO | Serial data output | 18-bit twos-complement output synchronized to SCK; tri-state when not selected in CS mode. |
| SCK | Serial clock input | Drives data shift-out; minimum period 15 ns (VIO > 4.5 V) - supports high-speed host interfacing. |
| SDI | Serial data input / mode select | Configures interface mode on CNV edge; in chain mode, relays upstream ADC data with 18-cycle delay. |
| VIO | Digital I/O supply | Independent 1.8 V–5 V supply for logic interface - enables mixed-voltage system integration. |
Key Features
| Feature | Design Value |
|---|---|
| No pipeline delay | Conversion result available immediately post-CNV rising edge - eliminates latency in closed-loop control or multiplexed channel sequencing. |
| Oversampled dynamic range | 125 dB at 1 kSPS - enables high-resolution DC or low-frequency measurements (e.g., strain gauge, thermocouple) with minimal filtering. |
| Low standby current | 1 nA typical - preserves battery life during idle periods in portable data loggers and handheld instruments. |
| Daisy-chain capability | Supports multiple AD7691BRMZ-RL7 units on single 3-wire bus - reduces PCB routing complexity and host GPIO count in multi-channel systems. |
| Flexible reference coupling | VREF can equal VDD (up to 5.25 V) - simplifies supply architecture by eliminating separate reference IC in many applications. |
Applications
| Seismic Data Acquisition | Portable Medical Instrumentation |
|---|---|
|
Use Scenario: High-fidelity digitization of low-amplitude, low-frequency vibration signals from geophone arrays deployed in remote field locations. IC Role / Device Role / Timing Role: Primary SAR ADC capturing differential sensor outputs with 18-bit resolution and 102 dB dynamic range at 250 kSPS. Use Value: Enables detection of sub-microvolt seismic events without amplification-induced noise, supported by 1.35 mW power at 100 kSPS and −40°C to +85°C operation. |
Use Scenario: Battery-powered ECG or EEG front-end where low power, high SNR, and absence of missing codes are essential for diagnostic accuracy. IC Role / Device Role / Timing Role: Precision analog input stage converting differential biopotential signals with true differential input and no pipeline latency. Use Value: Delivers 101.5 dB SINAD at 1 kHz and 20-bit noise-free code resolution at 1 kSPS - meets IEC 60601-2-27 requirements for clinical-grade signal fidelity. |
| Industrial Process Monitoring | High-Accuracy Data Logging |
|
Use Scenario: Continuous monitoring of pressure, temperature, or flow transducers in factory automation systems requiring long-term stability and traceability. IC Role / Device Role / Timing Role: Core ADC in isolated analog input module, interfacing to isolated SPI host via VIO-referenced digital interface. Use Value: ±1.5 LSB INL max and ±0.3 ppm/°C gain drift ensure measurement repeatability over temperature and time - critical for NIST-traceable calibration records. |
Use Scenario: Standalone environmental logger recording temperature, humidity, and air quality over weeks on coin-cell battery. IC Role / Device Role / Timing Role: Low-power ADC operating at 1 kSPS with 1.4 µW dissipation, leveraging oversampling to achieve 125 dB dynamic range. Use Value: 1 nA standby current and software-controllable power-down enable multi-year deployment without maintenance or battery replacement. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-resolution SAR ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD7690BRMZ-RL7 | Pin-for-pin compatible 18-bit SAR ADC; identical package and interface, but rated for 100 kSPS max throughput. | Lower throughput limits suitability to DC/low-frequency applications only (e.g., precision weight scales), not 250 kSPS seismic capture. | Select when full 250 kSPS is unnecessary and lower power at reduced speed is prioritized. |
| AD7687BRMZ-RL7 | 16-bit SAR ADC in same 10-lead MSOP/LFCSP; shares pinout and interface, but offers ±1.5 LSB INL at 16-bit resolution. | Lacks 18-bit resolution and 102 dB dynamic range - insufficient for applications demanding <1 ppm linearity or >100 dB SNR. | Choose for cost-sensitive, medium-accuracy systems where 16-bit resolution meets specification and BOM reuse is valuable. |
Compared with AD7690BRMZ-RL7 and AD7687BRMZ-RL7, the AD7691BRMZ-RL7 uniquely delivers 18-bit resolution at 250 kSPS in a drop-in-compatible 10-lead package - making it the only option among the three that satisfies simultaneous requirements for high speed, high resolution, and industrial temperature range without layout change.
Availability
AD7691BRMZ-RL7 is available at Aetrix Electronics and suitable for seismic data acquisition, portable medical instrumentation, and industrial process monitoring requiring stable component supply, long-lifecycle support, and guaranteed traceable sourcing.
Supply support for AD7691BRMZ-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, headquartered in Norwood, MA.
The AD7691BRMZ-RL7 belongs to the PulSAR® family of precision SAR ADCs, designed specifically for high-resolution, low-power, single-supply data acquisition in battery-operated and space-constrained instrumentation.
FAQ
What is the maximum sample rate of the AD7691BRMZ-RL7?
The AD7691BRMZ-RL7 achieves a maximum throughput of 250 kSPS when operated with VDD ≥ 4.5 V. At lower supply voltages (2.3 V to 4.5 V), the maximum rate drops to 180 kSPS. This is specified in Table 2 of the Rev. E datasheet and confirmed by timing parameters tCYC = 4 µs (min) under high-VDD conditions. The AD7691BRMZ-RL7 maintains full 18-bit performance across its entire speed range.
Does the AD7691BRMZ-RL7 require an external reference voltage?
Yes, the AD7691BRMZ-RL7 requires an external reference applied to the REF pin, which sets the full-scale input range. REF may be set from 0.5 V up to VDD (max 5.25 V), and the device draws only 60 µA load current at 250 kSPS. While REF can equal VDD to simplify design, using a precision external reference (e.g., ADR45xx series) is recommended for applications demanding <±1.5 LSB INL stability over temperature and time.
Is the AD7691BRMZ-RL7 pin-compatible with other PulSAR ADCs?
Yes, the AD7691BRMZ-RL7 is pin-for-pin compatible with the AD7690 (18-bit, 100 kSPS) and AD7693 (16-bit, 250 kSPS), as well as the AD7687 and AD7688 (16-bit). This allows direct substitution in existing layouts when upgrading resolution or speed - provided the host firmware accommodates the increased 18-bit word length and updated timing constraints of the AD7691BRMZ-RL7.
What digital interface modes does the AD7691BRMZ-RL7 support?
The AD7691BRMZ-RL7 supports two primary interface modes: CS mode (3- or 4-wire SPI-compatible) and Chain mode (daisy-chain). Mode selection occurs on the CNV rising edge based on SDI logic level. Both modes support 1.8 V–5 V logic via VIO, and Chain mode enables cascading of multiple AD7691BRMZ-RL7 units on a single SDO line with 18-cycle inter-ADC delay - verified in Figures 22–23 and Table 4 of the datasheet.
How does power consumption scale with throughput for the AD7691BRMZ-RL7?
Power dissipation in the AD7691BRMZ-RL7 scales linearly with throughput: 1.35 mW at 2.5 V/100 kSPS, 2.4 mW at 2.5 V/180 kSPS, and 10.6 mW at 5 V/250 kSPS. At ultra-low rates (100 SPS), it consumes just 1.4 µW. This scalability is intrinsic to its SAR architecture and is documented in Table 3 of the Rev. E datasheet - enabling precise energy budgeting in battery-powered AD7691BRMZ-RL7 systems.
AD7691BRMZ-RL7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- PulSAR®
- Package/Case:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Number of Bits:
- 18
- Sampling Rate (Per Second):
- 250k
- Number of Inputs:
- 1
- Input Type:
- Differential
- Data Interface:
- SPI, DSP
- Configuration:
- S/H-ADC
- Ratio - S/H:ADC:
- 1:1
- Number of A/D Converters:
- 1
- Architecture:
- SAR
- Reference Type:
- External
- Voltage - Supply, Analog:
- 2.3V ~ 5.5V
- Voltage - Supply, Digital:
- 2.3V ~ 5.5V
- Features:
- -
- Operating Temperature:
- -40°C ~ 85°C
- Supplier Device Package:
- 10-MSOP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
AD7691BRMZ-RL7 FAQ
1.How can I place an order for AD7691BRMZ-RL7 through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7691BRMZ-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 AD7691BRMZ-RL7 reliable?
The price and inventory of AD7691BRMZ-RL7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7691BRMZ-RL7 is usually 5 days.
3.What payment methods are accepted for AD7691BRMZ-RL7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7691BRMZ-RL7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7691BRMZ-RL7?
AD7691BRMZ-RL7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7691BRMZ-RL7 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 AD7691BRMZ-RL7?
For technical support, including AD7691BRMZ-RL7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7691BRMZ-RL7 requirements.
6.How does Aetrix verify that AD7691BRMZ-RL7 is sourced from the original manufacturer or authorized distributors?
All AD7691BRMZ-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 AD7691BRMZ-RL7 meets industry standards.
7.What is the process for return or replacement of AD7691BRMZ-RL7?
All AD7691BRMZ-RL7 units undergo pre-shipment inspection (PSI). If there is an issue with AD7691BRMZ-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 AD7691BRMZ-RL7 part is unused and in its original packaging.
Return procedure for AD7691BRMZ-RL7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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