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Analog Devices Inc. AD7690BRMZ
- Part No.:
- AD7690BRMZ
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
AD7690BRMZ.pdf
- Description:
- IC ADC 18BIT SAR 10MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:718
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Product details
Overview
AD7690BRMZ from Analog Devices is an 18-bit, successive approximation analog-to-digital converter (ADC) with true differential input, ±1.5 LSB INL max, 400 kSPS throughput, and no pipeline delay. It operates from a single 5 V supply with 1.8 V–5 V logic interface and is used in high-precision seismic data acquisition, medical instrumentation, and portable DVMs.
For engineers reviewing the AD7690BRMZ datasheet, AD7690BRMZ pinout, AD7690BRMZ application, or AD7690BRMZ equivalent, this page delivers verified specifications, validated pin functions, real-world use cases, and confirmed alternative options for precision SAR ADC selection in battery-powered and industrial measurement systems.
Technical Context
The AD7690BRMZ employs a charge redistribution capacitive DAC architecture with on-chip track-and-hold, enabling zero-latency conversion and full 18-bit linearity without missing codes. Its differential input stage supports ±VREF range with 65 dB CMRR at 250 kHz and 9 MHz −3 dB input bandwidth.
It uses a proprietary SPI-compatible serial interface with daisy-chain capability and optional busy indicator, supporting CS mode (3-/4-wire) and chain mode. Power scales linearly with throughput: 4.25 µW at 100 SPS, 17–20 mW at 400 kSPS, and standby current is 1 nA.
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 capture 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 instruments. |
| Digital Interface | SPI/QSPI/MICROWIRE/DSP compatible with daisy-chain and busy indicator - reduces host GPIO count and simplifies multi-ADC synchronization. |
| Supply | Single 4.75–5.25 V VDD with separate 1.8–5 V VIO - decouples analog core from noisy digital logic, improving noise immunity. |
| Power @ 400 kSPS | 17–20 mW - achieves 50 nJ/conversion efficiency, suitable for thermally constrained or energy-sensitive designs. |
| Input Range | True differential ±VREF (up to ±5 V), 0 V to VREF on each input - supports bipolar and unipolar configurations without external level-shifting. |
Pinout & Package
AD7690BRMZ is housed in a 10-lead MSOP package (3.0 mm × 3.0 mm × 1.1 mm) with exposed pad (EPAD) recommended to be soldered to ground for thermal and EMI performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| REF | Analog reference input | Accepts 0.5 V to VDD; must be decoupled with 10 µF capacitor - sets full-scale range and directly impacts gain accuracy and noise floor. |
| VDD | Analog power supply | 4.75–5.25 V supply for ADC core - powers internal DAC, comparator, and track-and-hold; sensitive to ripple. |
| IN+ | Differential positive analog input | Accepts voltage from 0 V to VREF; paired with IN− for true differential sampling - rejects common-mode noise up to 65 dB. |
| IN− | Differential negative analog input | Swings opposite phase to IN+ between 0 V and VREF - enables rejection of even-order harmonics and ground bounce. |
| GND | Analog ground reference | Return path for REF, IN+, IN−, and VDD - must be low-impedance and separated from digital ground to preserve 102 dB dynamic range. |
| CNV | Convert control input | Rising edge initiates sampling and selects interface mode (CS vs. chain); low in CS mode enables SDO - defines conversion timing and bus protocol. |
| SDO | Serial data output | 18-bit two's complement output synchronized to SCK - provides immediate result after conversion with no latency. |
| SCK | Serial clock input | Drives data shift-out; timing varies by VIO level (17–20 ns min period) - determines maximum interface speed and jitter sensitivity. |
| SDI | Serial data input | Configures interface mode on CNV rising edge (high = CS, low = chain); enables daisy-chain readout - eliminates need for multiple chip selects. |
| VIO | Digital I/O supply | 1.8–5 V logic interface supply - isolates digital noise from analog section and allows mixed-voltage system integration. |
Key Features
| Feature | Design Value |
|---|---|
| No pipeline delay | Immediate data availability post-conversion - eliminates timing uncertainty in closed-loop control or multiplexed channel sequencing. |
| Oversampled dynamic range | 125 dB at 1 kSPS - enables 20-bit noise-free resolution for ultra-low-noise DC measurements like strain gauge or thermocouple reading. |
| Low standby current | 1 nA - extends battery life in intermittent-sampling applications such as portable environmental sensors or handheld test equipment. |
| True differential input | ±VREF range with 0 V to VREF on both inputs - supports direct connection to instrumentation amplifiers (e.g., ADA4941) without external biasing. |
| Pin-for-pin compatibility | With AD7691, AD7982, AD7687, AD7688, AD7693 - allows scalable design reuse across 16-/18-bit PulSAR family without PCB redesign. |
Applications
| Seismic Data Acquisition | Portable Digital Multimeter (DVM) |
|---|---|
Use Scenario: High-resolution digitization of low-amplitude geophone signals in field-deployable seismic arrays. IC Role / Device Role / Timing Role: Primary SAR ADC capturing 24-bit-equivalent dynamic range via oversampling, synchronized to external GPS-triggered acquisition windows. Use Value: 125 dB oversampled dynamic range and 102 dB SNR at 400 kSPS enable detection of sub-microvolt earth motion signals buried in thermal noise. |
Use Scenario: Precision DC/AC voltage, current, and resistance measurement in handheld benchtop DVMs with autoranging. IC Role / Device Role / Timing Role: Core metrology ADC interfacing to auto-zeroed op-amp front-end and precision voltage reference (e.g., ADR4550). Use Value: ±1.5 LSB INL and 20-bit noise-free resolution ensure 5½-digit accuracy without factory recalibration across temperature. |
| Medical Instrumentation | Battery-Powered Data Logger |
Use Scenario: Low-power, high-fidelity acquisition of biopotential signals (ECG, EEG) in ambulatory monitoring devices. IC Role / Device Role / Timing Role: Low-noise, low-power ADC sampling at 1–10 kSPS with programmable gain amplifier (PGA) interface and on-demand wake-up. Use Value: 1 nA standby current and 4.25 µW at 100 SPS extend coin-cell battery life to >1 year while maintaining diagnostic-grade signal fidelity. |
Use Scenario: Long-term environmental parameter logging (temperature, pressure, humidity) in remote IoT nodes powered by solar + Li-ion. IC Role / Device Role / Timing Role: Event-triggered ADC activated by microcontroller interrupt; samples sensor outputs only during scheduled intervals. Use Value: Single-supply 5 V operation and 1.8 V logic compatibility simplify power architecture; daisy-chain support reduces wiring in multi-sensor nodes. |
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-RL7 | Same 18-bit resolution and 400 kSPS, but in 10-lead LFCSP; lower typical INL (±0.5 LSB) and higher dynamic range (103 dB), yet requires external reference. | Better suited for space-constrained PCBs where thermal dissipation and board area are critical; lacks integrated reference buffer. | Select AD7691 when footprint and thermal performance outweigh reference integration needs. |
| AD7982BRMZ | 18-bit, 500 kSPS, ±1.5 LSB INL, but uses pseudo-differential input and consumes 25 mW at full rate - higher power and reduced CMRR (55 dB). | Applicable where higher speed justifies trade-offs in noise immunity and power; not suitable for true differential sensor interfaces. | Choose AD7982 only when throughput >400 kSPS is mandatory and differential input rejection is secondary. |
Compared with AD7691BCPZ-RL7 and AD7982BRMZ, the AD7690BRMZ uniquely balances true differential input integrity, ultra-low standby current, and integrated reference flexibility - making it optimal for portable, precision, and thermally sensitive measurement systems where signal fidelity and energy efficiency are co-prioritized.
Availability
AD7690BRMZ is available at Aetrix Electronics and suitable for seismic data acquisition, portable DVMs, medical instrumentation, and battery-powered data loggers requiring stable component supply, long-lifecycle assurance, and traceable sourcing.
Supply support for AD7690BRMZ 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 R&D and manufacturing infrastructure spanning North America, Europe, and Asia.
The AD7690BRMZ belongs to Analog Devices' PulSAR® family of precision successive approximation ADCs, designed specifically for high-resolution, low-power, and low-latency data acquisition in instrumentation, industrial, and medical applications.
FAQ
What is the maximum sample rate of the AD7690BRMZ?
The AD7690BRMZ achieves a maximum throughput of 400 kSPS under specified conditions (VDD = 4.75–5.25 V, VREF = VDD). At this rate, conversion time is 0.5–2.1 µs, and cycle time is 2.5 µs. Performance remains stable across the full −40°C to +85°C operating range, with no pipeline delay affecting timing predictability in the AD7690BRMZ.
Does the AD7690BRMZ require an external reference voltage?
Yes, the AD7690BRMZ requires an external reference voltage applied to the REF pin, which can range from 0.5 V to VDD. The device does not include an internal reference; however, it supports direct connection to precision external references (e.g., ADR4550) and specifies load current ≤100 µA at 400 kSPS. This design choice preserves flexibility and accuracy in the AD7690BRMZ reference path.
Is the AD7690BRMZ compatible with 1.8 V digital logic?
Yes, the AD7690BRMZ supports 1.8 V digital logic via its dedicated VIO supply pin, which accepts 1.8 V to VDD (max 5.25 V). Input thresholds scale with VIO (VIH = 0.7 × VIO, VIL = 0.3 × VIO), and timing parameters (e.g., SCK period) are specified per VIO level. This ensures robust interoperability with low-voltage microcontrollers in the AD7690BRMZ interface.
What package options are available for the AD7690BRMZ?
The AD7690BRMZ is offered exclusively in a 10-lead MSOP package (3.0 mm × 3.0 mm × 1.1 mm) with exposed pad. It is not available in LFCSP or other variants under this specific part number. The MSOP variant maintains pin-for-pin compatibility with LFCSP-packaged PulSAR ADCs like AD7691, enabling layout reuse - a key feature of the AD7690BRMZ family alignment.
How does the daisy-chain mode work on the AD7690BRMZ?
Daisy-chain mode on the AD7690BRMZ is enabled when SDI is low at the CNV rising edge. In this mode, multiple AD7690BRMZ devices share one SDO line: each device delays its output by 18 SCK cycles, allowing sequential readout of all conversion results using a single serial interface. No additional chip select lines are required, reducing host resource usage in multi-channel systems.
AD7690BRMZ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- PulSAR®
- Package/Case:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Number of Bits:
- 18
- Sampling Rate (Per Second):
- 400k
- 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:
- 5V
- Voltage - Supply, Digital:
- 5V
- Features:
- -
- Operating Temperature:
- -40°C ~ 85°C
- Supplier Device Package:
- 10-MSOP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
AD7690BRMZ FAQ
1.How can I place an order for AD7690BRMZ through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7690BRMZ 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 AD7690BRMZ reliable?
The price and inventory of AD7690BRMZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7690BRMZ is usually 5 days.
3.What payment methods are accepted for AD7690BRMZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7690BRMZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7690BRMZ?
AD7690BRMZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7690BRMZ 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 AD7690BRMZ?
For technical support, including AD7690BRMZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7690BRMZ requirements.
6.How does Aetrix verify that AD7690BRMZ is sourced from the original manufacturer or authorized distributors?
All AD7690BRMZ 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 AD7690BRMZ meets industry standards.
7.What is the process for return or replacement of AD7690BRMZ?
All AD7690BRMZ units undergo pre-shipment inspection (PSI). If there is an issue with AD7690BRMZ, 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 AD7690BRMZ part is unused and in its original packaging.
Return procedure for AD7690BRMZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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