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Analog Devices Inc. AD7691SRMZ-EP-RL7
- Part No.:
- AD7691SRMZ-EP-RL7
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
AD7691SRMZ-EP-RL7.pdf
- Description:
- IC ADC 18BIT SAR 10MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,354
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Product details
Overview
AD7691SRMZ-EP-RL7 from Analog Devices is an 18-bit, charge redistribution successive approximation register (SAR) analog-to-digital converter optimized for high-precision, low-power data acquisition in harsh environments. It delivers 250 kSPS throughput, ±0.75 LSB typical INL over −40°C to +85°C, true differential ±VREF input range, and operates from a single 2.3 V to 5.25 V supply with separate 1.8 V–5 V logic interface (VIO). It is deployed in seismic data acquisition systems requiring stable performance across military temperature extremes.
For engineers reviewing the AD7691SRMZ-EP-RL7 datasheet, AD7691SRMZ-EP-RL7 pinout, AD7691SRMZ-EP-RL7 application, or AD7691SRMZ-EP-RL7 equivalent, key selection criteria include guaranteed 18-bit no-missing-codes operation at −55°C to +105°C, SPI/QSPI/MICROWIRE-compatible daisy-chain capability, and sub-2 µs acquisition time with no pipeline delay - critical for synchronized multi-channel sampling in defense-grade instrumentation.
Technical Context
The AD7691SRMZ-EP-RL7 implements a charge redistribution SAR architecture with internal conversion clock and zero-latency sampling triggered on the CNV rising edge. Its differential input stage accepts true bipolar signals up to ±VREF (with VREF up to VDD), while common-mode rejection exceeds 65 dB at 250 kHz.
Digital interfacing supports both CS mode (with optional busy indicator) and chain mode (enabling multi-ADC daisy-chaining via SDI/SDO), all compatible with 1.8 V–5 V logic levels via dedicated VIO supply. Power scales linearly with throughput: 1.35 mW at 100 kSPS (VDD = 2.5 V) and 10.6 mW at full 250 kSPS (VDD = 5 V).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 18-bit with no missing codes - ensures monotonicity and full code coverage for precision measurement systems. |
| Throughput | 250 kSPS maximum (VDD ≥ 4.5 V); 180 kSPS (VDD < 4.5 V) - enables real-time capture of wideband sensor signals. |
| INL | ±0.75 LSB typical (−40°C to +85°C); −2.7/+2 LSB min/max (−55°C to +105°C) - defines end-point linearity error under extended temperature stress. |
| SINAD | 101 dB typical at fIN = 1 kHz, VREF = 5 V - supports >16.5 ENOB for high-fidelity signal reconstruction. |
| Analog Input Range | True differential ±VREF (up to VDD); 0 V to VREF on each input - allows flexible unipolar or bipolar front-end design with external reference. |
| Power Dissipation | 1.4 µW at 100 SPS (VDD = 2.5 V); 12.5 mW max at 250 kSPS (VDD = 5 V) - enables ultra-low-power sleep modes and scalable active power. |
| Temperature Range | −55°C to +105°C (military grade, AQEC qualified) - validated for aerospace, defense, and downhole industrial deployment. |
Pinout & Package
AD7691SRMZ-EP-RL7 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 not connected internally.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - REF | Analog reference input | Accepts external reference voltage from 0.5 V to VDD; requires local 10 µF decoupling for noise immunity. |
| 2 - VDD | Analog power supply | Primary supply rail (2.3 V–5.25 V); powers core ADC and reference buffer. |
| 3 - IN+ | Differential analog input (+) | Swings 0 V to VREF, 180° out-of-phase with IN−; supports true differential or pseudo-differential configurations. |
| 4 - IN− | Differential analog input (−) | Swings 0 V to VREF, 180° out-of-phase with IN+; common-mode centered at VREF/2 ± 0.1 V. |
| 5 - GND | Analog ground | Reference return for analog circuitry; must be star-connected to minimize noise coupling. |
| 6 - CNV | Convert control input | Rising edge initiates sampling; selects interface mode (CS or chain) based on SDI state at edge. |
| 7 - SDO | Serial data output | 18-bit two's complement result, MSB-first, synchronized to SCK falling edge; tri-state when disabled. |
| 8 - SCK | Serial clock input | Drives data shift-out; timing varies by VIO level (15–40 ns period) and interface mode. |
| 9 - SDI | Serial data input | Configures interface mode (low = chain, high = CS); in chain mode, relays upstream ADC data with 18-cycle delay. |
| 10 - VIO | Digital I/O supply | Independent 1.8 V–5 V rail for logic interface; isolates digital noise from analog section. |
Key Features
| Feature | Design Value |
|---|---|
| No pipeline delay | Immediate data availability post-conversion (tCONV ≤ 3.7 µs), enabling deterministic real-time control loops. |
| Oversampled dynamic range | 125 dB at 1 kSPS - achieved via digital filtering of 250 kSPS raw stream, enhancing resolution for low-frequency sensors. |
| Low standby current | 1 nA at VDD/VIO = 5 V and TA = 25°C - supports battery-powered systems with years-long quiescent life. |
| Daisy-chain capability | Supports unlimited cascaded ADCs on single 3-wire bus (CNV/SCK/SDO), reducing PCB routing complexity in multi-channel systems. |
| Enhanced product qualification | AQEC-compliant with controlled manufacturing baseline, single fab/assembly/test site, and extended temp validation (−55°C to +105°C). |
Applications
| Seismic Data Acquisition | Medical Instrumentation |
|---|---|
|
Use Scenario: High-channel-count geophone arrays deployed in oil/gas exploration require synchronized, low-noise digitization of microvolt-level vibration signals over extreme ambient temperatures. IC Role / Device Role / Timing Role: Primary SAR ADC capturing differential sensor outputs with 102 dB dynamic range and no missing codes across −55°C to +105°C. Use Value: Enables detection of weak subsurface reflections without code ambiguities, directly supporting accurate geological modeling. |
Use Scenario: Portable EEG/EMG devices demand ultra-low-power, high-resolution analog front-ends that maintain accuracy during extended battery operation. IC Role / Device Role / Timing Role: Precision digitizer for biopotential amplifiers, leveraging 1.4 µW standby power and 20-bit noise-free resolution at 1 kSPS. Use Value: Extends clinical-grade monitoring runtime while preserving diagnostic fidelity in low-amplitude neural signal bands. |
| Battery-Powered Test Equipment | Aerospace Avionics Monitoring |
|
Use Scenario: Handheld multimeters and portable oscilloscopes require high DC accuracy, low drift, and minimal self-heating during field calibration. IC Role / Device Role / Timing Role: Core ADC providing ±0.1 mV zero error and ±2 LSB gain error over full military temperature range. Use Value: Eliminates need for frequent on-site recalibration, ensuring traceable metrology compliance in remote deployments. |
Use Scenario: Flight control sensor interfaces in UAVs and satellites must survive launch vibration and operate reliably in vacuum-adjacent thermal cycling. IC Role / Device Role / Timing Role: Radiation-tolerant (by process) SAR converter with AQEC pedigree, used for pressure, temperature, and inertial sensor digitization. Use Value: Delivers mission-critical data integrity without derating, backed by controlled baseline documentation and change notification. |
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 |
|---|---|---|---|
| AD7690BRMZ-REEL7 | Pin-for-pin compatible 18-bit SAR ADC but rated only for −40°C to +85°C industrial range; lacks AQEC qualification and extended temp validation. | Suitable for commercial test equipment or industrial PLCs where military temp range is unnecessary. | Select AD7690BRMZ-REEL7 only if operating environment stays within −40°C to +85°C and AQEC documentation is not required. |
| AD7693BRMZ-REEL7 | 16-bit resolution, same 10-lead MSOP footprint and SPI interface; lower power (0.7 mW at 100 kSPS) but reduced dynamic range (96 dB typical). | Appropriate for cost-sensitive, medium-accuracy applications like motor phase current sensing or HVAC sensor hubs. | Choose AD7693BRMZ-REEL7 when 16-bit resolution suffices and system-level SNR budget permits 6 dB reduction versus AD7691SRMZ-EP-RL7. |
Compared with AD7690BRMZ-REEL7, AD7691SRMZ-EP-RL7 adds −55°C to +105°C operation and AQEC compliance at the cost of higher price and slightly higher active power; versus AD7693BRMZ-REEL7, it trades 2-bit resolution uplift and 6 dB dynamic range gain for increased power and cost - making it optimal for defense, seismic, and high-end medical use cases demanding verified extended-temp performance.
Availability
AD7691SRMZ-EP-RL7 is available at Aetrix Electronics and suitable for seismic data acquisition, aerospace avionics monitoring, and battery-powered medical instrumentation requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for AD7691SRMZ-EP-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, with design and manufacturing facilities worldwide.
The AD7691-EP product line delivers radiation-tolerant, extended-temperature SAR ADCs engineered for defense, aerospace, and critical infrastructure applications where reliability under environmental stress is non-negotiable.
FAQ
What is the operating temperature range certified for AD7691SRMZ-EP-RL7?
The AD7691SRMZ-EP-RL7 is fully specified and qualified for continuous operation from −55°C to +105°C, meeting AQEC standards for defense and aerospace applications. This includes validated performance for INL, SINAD, and power consumption across the full range, with test data documented in the Rev. A datasheet.
Does AD7691SRMZ-EP-RL7 support daisy-chaining with other ADCs, and how is it configured?
Yes, AD7691SRMZ-EP-RL7 supports daisy-chaining via its SDI and SDO pins in chain mode. Configuration occurs automatically: when SDI is low at the CNV rising edge, the device enters chain mode, forwarding upstream ADC data with an 18-cycle delay. Up to four AD7691SRMZ-EP-RL7 units can be cascaded on one 3-wire bus (CNV/SCK/SDO).
What reference voltage options are supported by AD7691SRMZ-EP-RL7, and what is the recommended decoupling?
AD7691SRMZ-EP-RL7 accepts an external reference voltage (REF) from 0.5 V to VDD, with optimal performance at 2.5 V or 5 V. The REF pin must be decoupled using a minimum 10 µF tantalum or ceramic capacitor placed as close as possible to the pin, as specified in the Analog Devices AD7691-EP datasheet Figure 1 and Pin Function Descriptions.
How does the power consumption of AD7691SRMZ-EP-RL7 scale with throughput and supply voltage?
AD7691SRMZ-EP-RL7 exhibits linear power scaling: at VDD = 2.5 V, it consumes 1.35 mW at 100 kSPS and 2.4 mW at 180 kSPS; at VDD = 5 V, consumption rises to 4.24 mW at 100 kSPS and 12.5 mW at 250 kSPS. Standby current remains at 1 nA regardless of throughput, enabling ultra-low-power wake-on-event architectures.
Is AD7691SRMZ-EP-RL7 pin-compatible with other members of the AD769x family?
Yes, AD7691SRMZ-EP-RL7 is pin-for-pin compatible with the AD7690 (18-bit), AD7693 (16-bit), AD7688 (16-bit), and AD7687 (16-bit), all in 10-lead MSOP. This allows direct substitution in existing layouts when upgrading resolution or temperature range - provided system firmware accounts for bit-width and timing differences.
AD7691SRMZ-EP-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:
- ADC
- Ratio - S/H:ADC:
- -
- Number of A/D Converters:
- 1
- Architecture:
- SAR
- Reference Type:
- External
- Voltage - Supply, Analog:
- 2.3V ~ 5.25V
- Voltage - Supply, Digital:
- 1.8V ~ 5.25V
- Features:
- -
- Operating Temperature:
- -55°C ~ 105°C
- Supplier Device Package:
- 10-MSOP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
AD7691SRMZ-EP-RL7 FAQ
1.How can I place an order for AD7691SRMZ-EP-RL7 through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7691SRMZ-EP-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 AD7691SRMZ-EP-RL7 reliable?
The price and inventory of AD7691SRMZ-EP-RL7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7691SRMZ-EP-RL7 is usually 5 days.
3.What payment methods are accepted for AD7691SRMZ-EP-RL7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7691SRMZ-EP-RL7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7691SRMZ-EP-RL7?
AD7691SRMZ-EP-RL7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7691SRMZ-EP-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 AD7691SRMZ-EP-RL7?
For technical support, including AD7691SRMZ-EP-RL7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7691SRMZ-EP-RL7 requirements.
6.How does Aetrix verify that AD7691SRMZ-EP-RL7 is sourced from the original manufacturer or authorized distributors?
All AD7691SRMZ-EP-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 AD7691SRMZ-EP-RL7 meets industry standards.
7.What is the process for return or replacement of AD7691SRMZ-EP-RL7?
All AD7691SRMZ-EP-RL7 units undergo pre-shipment inspection (PSI). If there is an issue with AD7691SRMZ-EP-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 AD7691SRMZ-EP-RL7 part is unused and in its original packaging.
Return procedure for AD7691SRMZ-EP-RL7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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