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Analog Devices Inc. AD7690BRMZ-RL7
- Part No.:
- AD7690BRMZ-RL7
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
AD7690BRMZ-RL7.pdf
- Description:
- IC ADC 18BIT SAR 10MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:650
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Product details
Overview
AD7690BRMZ-RL7 from Analog Devices is an 18-bit successive approximation analog-to-digital converter (ADC) with true differential input, ±1.5 LSB INL, 400 kSPS throughput, and single 5 V supply operation. It features no pipeline delay, SPI/QSPI/MICROWIRE-compatible serial interface, and operates across −40°C to +85°C in a 10-lead MSOP package. It is used in high-precision seismic data acquisition and portable instrumentation where low power and high linearity are critical.
For engineers reviewing the AD7690BRMZ-RL7 datasheet, AD7690BRMZ-RL7 pinout, AD7690BRMZ-RL7 application, or AD7690BRMZ-RL7 equivalent, this page delivers verified technical context, real-world design meaning for key specs, validated pin functions, confirmed alternative parts with functional distinctions, and supply-chain support details specific to OEM and industrial embedded programs.
Technical Context
The AD7690BRMZ-RL7 implements a charge redistribution SAR architecture with on-chip track-and-hold, enabling zero-latency conversion and full 18-bit accuracy without missing codes. Its differential input accepts ±VREF ranges up to ±5 V, with common-mode range centered at VREF/2 ± 0.1 V and 65 dB CMRR at 250 kHz.
It uses a proprietary SPI-compatible 3- or 4-wire interface with daisy-chain capability via SDI/SDO, supports 1.8 V to 5 V logic via separate VIO, and scales power linearly with throughput - consuming only 4.25 µW at 100 SPS and 20 mW at 400 kSPS. 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 ~195 kHz Nyquist bandwidth. |
| INL | ±1.5 LSB max (±6 ppm of FSR) - ensures <±12 ppm total error budget when combined with reference drift. |
| Differential Input Range | ±VREF (up to ±5 V) - supports direct connection to precision op-amp drivers like ADA4941 without level-shifting. |
| Dynamic Range | 102 dB at 400 kSPS - allows detection of signals 105× smaller than full scale in high-speed mode. |
| Power @ 100 kSPS | 4.25 mW typical - enables battery-powered DVMs and portable medical instruments with >100-hour runtime. |
| Interface Logic | 1.8 V/2.5 V/3 V/5 V compatible via VIO - eliminates level-shifters when interfacing with modern low-voltage MCUs. |
Pinout & Package
AD7690BRMZ-RL7 is housed in a 10-lead MSOP package (3.0 mm × 4.9 mm, 0.5 mm pitch), RoHS-compliant, with exposed pad recommended for grounding to improve thermal and noise performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - REF | Analog reference input | Accepts 0.5 V to VDD; must be decoupled with 10 µF ceramic capacitor; sets full-scale range for differential input. |
| 2 - VDD | Analog power supply | 4.75 V to 5.25 V; powers internal SAR core, track-and-hold, and reference buffer. |
| 3 - IN+ | Differential analog input (+) | Swings 0 V to VREF relative to IN−; requires matched layout and driver with ≥9 MHz bandwidth. |
| 4 - IN− | Differential analog input (−) | Swings 0 V to VREF relative to IN+; common-mode voltage fixed at VREF/2 ± 0.1 V. |
| 5 - GND | Analog ground | Single-point return for REF, IN+, IN−, and VDD; isolated from digital ground except at single star point. |
| 6 - CNV | Convert control input | Rising edge initiates sampling; selects CS vs. chain mode based on SDI state; enables busy indicator in CS mode. |
| 7 - SDO | Serial data output | 18-bit two's complement output synchronized to SCK falling edge; tri-state when CNV/SDI high in CS mode. |
| 8 - SCK | Serial clock input | Drives data shift-out; min period 15 ns (VIO > 4.5 V); supports daisy-chain timing alignment. |
| 9 - SDI | Serial data input / mode select | Low at CNV rising edge enables chain mode; high enables CS mode; also carries daisy-chain input data. |
| 10 - VIO | Digital I/O supply | 2.3 V to VDD; sets logic thresholds for all digital pins; decoupling required for noise immunity. |
Key Features
| Feature | Design Value |
|---|---|
| No pipeline delay | Enables deterministic timing in multiplexed multi-channel systems - conversion result available immediately after tCONV (≤2.1 µs). |
| Oversampled dynamic range: 125 dB @ 1 kSPS | Supports ultra-low-noise applications like seismic sensor arrays where 20-bit noise-free resolution is required. |
| True differential input with 65 dB CMRR @ 250 kHz | Rejects common-mode noise from motor drives or switching supplies without external instrumentation amplifiers. |
| 1 nA standby current | Permits micro-power wake-on-event architectures - e.g., battery-powered environmental monitors sleeping between acquisitions. |
| Pin-for-pin compatibility with AD7691/AD7982/AD7687 | Allows hardware reuse across 16–18-bit PulSAR family - simplifies design migration and BOM consolidation. |
Applications
| Seismic Data Acquisition | Portable Digital Multimeter (DVM) |
|---|---|
|
Use Scenario: High-resolution measurement of low-amplitude earth tremors using geophone arrays with wide dynamic range requirements. IC Role / Device Role / Timing Role: Primary ADC capturing differential sensor outputs at 100–400 kSPS with minimal latency and no missing codes. Use Value: 102 dB dynamic range and ±1.5 LSB INL enable detection of sub-microvolt signals buried in thermal noise over decades of amplitude. |
Use Scenario: Precision DC/AC voltage, current, and resistance measurements in handheld test equipment with auto-ranging and battery operation. IC Role / Device Role / Timing Role: Core metrology ADC interfaced to auto-zero amplifier and precision reference, operating at 1–10 kSPS in oversampled mode. Use Value: 125 dB oversampled dynamic range and 20-bit noise-free resolution eliminate need for external averaging, reducing measurement time by 4×. |
| Medical Instrumentation | Battery-Powered Data Loggers |
|
Use Scenario: ECG and EEG signal digitization requiring high SNR, low THD (−125 dB), and galvanic isolation. IC Role / Device Role / Timing Role: Isolated-side ADC sampling conditioned biopotential signals with true differential input rejecting 50/60 Hz interference. Use Value: 101.5 dB SINAD at 1 kHz and 65 dB CMRR suppress mains noise without additional filtering, preserving signal fidelity. |
Use Scenario: Long-term environmental monitoring (temperature, pressure, humidity) powered by coin-cell or Li-ion batteries. IC Role / Device Role / Timing Role: Low-duty-cycle ADC activated periodically by MCU; spends >99.9% time in 1 nA standby mode. Use Value: 4.25 µW power at 100 SPS extends 10-year deployment life on a single CR2032 cell with verified energy-per-conversion of 50 nJ. |
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 |
|---|---|---|---|
| AD7691BRMZ | Same 18-bit resolution and 400 kSPS, but includes internal reference (2.5 V) and higher INL (±2 LSB max); 10-lead LFCSP only. | Reduces BOM count in space-constrained designs but sacrifices external reference flexibility and worst-case linearity. | Select AD7691BRMZ if reference integration and LFCSP footprint are prioritized over ±1.5 LSB INL and MSOP compatibility. |
| AD7982BRMZ | 18-bit, 500 kSPS, ±1.5 LSB INL, but requires external reference and has higher power (25 mW @ 400 kSPS); pinout differs in REF/VIO placement. | Used in higher-speed data acquisition where 100 kSPS headroom is needed, but demands more PCB area and thermal management. | Select AD7982BRMZ only when throughput >400 kSPS is mandatory and layout allows rework for non-pin-compatible REF/VIO routing. |
Compared with AD7691BRMZ and AD7982BRMZ, the AD7690BRMZ-RL7 uniquely balances 18-bit linearity, 400 kSPS speed, ultra-low standby current (1 nA), and MSOP package - making it optimal for battery-critical, high-accuracy applications where external reference control and pin compatibility with legacy PulSAR designs are essential.
Availability
AD7690BRMZ-RL7 is available at Aetrix Electronics and suitable for seismic sensing, portable instrumentation, and medical diagnostics requiring stable component supply, long-lifecycle assurance, and traceable sourcing.
Supply support for AD7690BRMZ-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 AD7690BRMZ-RL7 belongs to the PulSAR® family of precision SAR ADCs, engineered for applications demanding high resolution, low power, and true differential input performance in harsh or battery-limited environments.
FAQ
What is the maximum sampling rate supported by the AD7690BRMZ-RL7?
The AD7690BRMZ-RL7 supports a maximum throughput of 400 kSPS, with conversion time from CNV rising edge to valid data output specified at ≤2.1 µs. At this rate, the device achieves 102 dB dynamic range and maintains ±1.5 LSB integral nonlinearity. Lower throughput modes (e.g., 1 kSPS) improve performance to 125 dB oversampled dynamic range and 20-bit noise-free resolution.
Does the AD7690BRMZ-RL7 require an external voltage reference?
Yes, the AD7690BRMZ-RL7 requires an external reference applied to the REF pin. The reference voltage range is 0.5 V to VDD (up to 5.25 V), and it directly defines the full-scale differential input range (±VREF). No internal reference is provided - this enables system-level optimization using ultra-stable references like ADR4550 or LT6657.
Can the AD7690BRMZ-RL7 interface directly with a 1.8 V microcontroller?
Yes, the AD7690BRMZ-RL7 supports 1.8 V logic via its dedicated VIO supply pin. When VIO = 1.8 V, digital inputs (CNV, SDI, SCK) accept standard 1.8 V logic levels, and SDO outputs are compatible with 1.8 V receivers. Timing parameters adjust accordingly - e.g., minimum SCK period increases to 20 ns - ensuring robust communication without level shifters.
What package type is used for the AD7690BRMZ-RL7?
The AD7690BRMZ-RL7 is supplied in a 10-lead MSOP package (RMZ suffix), measuring 3.0 mm × 4.9 mm with 0.5 mm lead pitch. It features an exposed pad recommended for soldering to the PCB ground plane to enhance thermal dissipation and reduce ground impedance. This package is pin-compatible with other PulSAR ADCs including AD7691 and AD7687.
How does the AD7690BRMZ-RL7 handle power consumption at low throughput rates?
The AD7690BRMZ-RL7 scales power linearly with throughput: it consumes just 4.25 µW at 100 SPS, 4.25 mW at 100 kSPS, and 20 mW at 400 kSPS. In standby mode (all inputs static), current drops to 1 nA. This makes it ideal for duty-cycled applications such as battery-powered data loggers, where the ADC can sleep between acquisitions without sacrificing wake-up latency or accuracy.
AD7690BRMZ-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):
- 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-RL7 FAQ
1.How can I place an order for AD7690BRMZ-RL7 through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7690BRMZ-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 AD7690BRMZ-RL7 reliable?
The price and inventory of AD7690BRMZ-RL7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7690BRMZ-RL7 is usually 5 days.
3.What payment methods are accepted for AD7690BRMZ-RL7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7690BRMZ-RL7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7690BRMZ-RL7?
AD7690BRMZ-RL7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7690BRMZ-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 AD7690BRMZ-RL7?
For technical support, including AD7690BRMZ-RL7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7690BRMZ-RL7 requirements.
6.How does Aetrix verify that AD7690BRMZ-RL7 is sourced from the original manufacturer or authorized distributors?
All AD7690BRMZ-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 AD7690BRMZ-RL7 meets industry standards.
7.What is the process for return or replacement of AD7690BRMZ-RL7?
All AD7690BRMZ-RL7 units undergo pre-shipment inspection (PSI). If there is an issue with AD7690BRMZ-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 AD7690BRMZ-RL7 part is unused and in its original packaging.
Return procedure for AD7690BRMZ-RL7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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