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Analog Devices Inc. AD7791BRMZ-REEL
- Part No.:
- AD7791BRMZ-REEL
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
AD7791BRMZ-REEL.pdf
- Description:
- IC ADC 24BIT SIGMA-DELTA 10MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,406
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Product details
Overview
AD7791BRMZ-REEL from Analog Devices is a low-power, buffered 24-bit sigma-delta ADC with single differential input, internal clock oscillator, rail-to-rail input buffer, and VDD monitor channel - delivering 1.1 µV rms noise at 9.5 Hz update rate, 19.5-bit p-p resolution, and simultaneous 50/60 Hz rejection for precision sensor measurement in battery-powered instrumentation.
For engineers reviewing the AD7791BRMZ-REEL datasheet, AD7791BRMZ-REEL pinout, AD7791BRMZ-REEL application, or AD7791BRMZ-REEL equivalent, key selection criteria include its 75 µA max normal-mode current, 10-lead MSOP package, SPI/QSPI/MICROWIRE-compatible 3-wire interface, ±3.5 ppm INL typical, and buffered/unbuffered mode configurability via MODE register.
Technical Context
The AD7791BRMZ-REEL implements a fully integrated analog front end with a low-noise modulator, programmable digital filter, and on-chip clock oscillator - eliminating external timing components. Its sigma-delta architecture supports software-selectable output rates from 9.5 Hz to 120 Hz, with filter coefficients (FS[2:0]) and clock division (CDIV[1:0]) directly controlling noise, rejection, and power trade-offs.
It features dual operating modes: buffered (145 µA max @ 3.6 V) enables high-impedance sensor interfacing without gain error, while unbuffered (65 µA typ @ 3.6 V) reduces current for ultra-low-power applications. The VDD monitor channel (CH1=CH0=11b) provides internal 1/5-scaled supply measurement using a 1.17 V ±5% on-chip reference.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 19.5-bit p-p at 9.5 Hz - delivers stable, noise-immune digitization for weigh scales and pressure sensors requiring sub-µV sensitivity. |
| RMS Noise | 1.1 µV at 9.5 Hz - enables direct interface to mV-level thermocouples or strain gauges without external amplification. |
| Integral Nonlinearity | ±3.5 ppm typical - ensures <0.0004% full-scale error across temperature, critical for calibration-critical smart transmitters. |
| Power Supply Range | 2.5 V to 5.25 V - supports direct operation from Li-ion batteries (3.0–4.2 V) or industrial 3.3 V/5 V rails without LDO overhead. |
| Update Rate | 9.5 Hz to 120 Hz - software-programmable via Filter Register; lower rates improve noise and 50/60 Hz rejection for AC-line-noise-prone environments. |
| Common Mode Rejection | 110 dB typ @ 50/60 Hz - suppresses interference from shared ground paths in 4–20 mA loop-powered field devices. |
| Input Buffer | Rail-to-rail, enabled via BUF bit - allows direct connection of high-Z resistive sensors (e.g., RTDs) without external op-amp or gain drift errors. |
Pinout & Package
AD7791BRMZ-REEL is housed in a 10-lead MSOP (3 mm × 3 mm, 0.5 mm pitch) with exposed pad for thermal performance. Pin assignments are validated per Analog Devices AD7791 Rev. A datasheet Figure 5 and Table 4.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SCLK | Serial clock input | Schmitt-triggered - enables robust opto-isolated or noisy industrial bus communication; supports continuous or burst clocking. |
| CS | Chip select (active low) | Enables 3-wire mode when hardwired low; serves as frame sync in multi-device SPI daisy chains. |
| AIN(+), AIN(–) | Differential analog input | Fully differential input pair - accepts ±REFIN range; buffered mode extends common-mode range to GND + 100 mV to VDD – 100 mV. |
| REFIN(+), REFIN(–) | Reference voltage inputs | Accepts 0.1 V to VDD reference - supports ratiometric measurements with external precision references or internal VDD monitoring. |
| GND, VDD | Ground and supply | Separate analog/digital ground not required - single GND pin simplifies layout; VDD powers entire signal chain including buffer and reference. |
| DOUT/RDY | Combined data output / conversion ready | Functions as serial data output during reads and open-drain RDY indicator - eliminates need for separate interrupt line in microcontroller systems. |
| DIN | Serial data input | Loads communications, mode, filter, and status registers - enables full configuration (e.g., BUF, U/B, FS[2:0]) without external hardware. |
Key Features
| Feature | Design Value |
|---|---|
| Internal clock oscillator | Eliminates external crystal/clock source - reduces BOM count and PCB area in portable instrumentation and space-constrained modules. |
| Simultaneous 50 Hz and 60 Hz rejection | Configurable via FS[2:0] bits - achieves >80 dB rejection at either frequency without notch filters or firmware compensation. |
| VDD monitor channel | Measures 1/5-scaled supply voltage using internal 1.17 V reference - enables real-time battery health monitoring in wireless sensor nodes. |
| Rail-to-rail input buffer | Supports direct connection of high-output-impedance sensors (e.g., thermistors, bridge transducers) without external buffering or gain error. |
| Low-power modes (CDIV[1:0]) | Divides internal clock by 2/4/8 - reduces current to ≤1 μA in power-down and scales update rate linearly for adaptive power management. |
Applications
| Smart Transmitters | Battery-Powered Instrumentation |
|---|---|
|
Use Scenario: 4–20 mA loop-powered field transmitter measuring temperature or pressure in hazardous industrial zones. IC Role / Device Role / Timing Role: Primary sigma-delta ADC front end - digitizes millivolt-level sensor outputs while rejecting 50/60 Hz EMI from nearby motors or lighting. Use Value: Simultaneous 50/60 Hz rejection and 1.1 µV rms noise enable single-device compliance with IEC 61000-4-8 magnetic field immunity without external filtering. |
Use Scenario: Handheld multimeter or portable gas detector operating from two AA cells for >1 year. IC Role / Device Role / Timing Role: Low-power analog acquisition core - operates in unbuffered mode (65 µA typ) at 9.5 Hz to maximize battery life while maintaining 19.5-bit p-p resolution. Use Value: 75 µA max normal current and 1 µA power-down current allow sleep/wake architectures with sub-µA system standby. |
| Temperature Measurement Systems | Weigh Scales & Load Cells |
|
Use Scenario: RTD-based temperature controller in HVAC or medical equipment requiring ±0.1°C accuracy over –40°C to +105°C. IC Role / Device Role / Timing Role: Buffered ADC interface - uses rail-to-rail input buffer to drive 100 Ω–1 kΩ RTD bridges directly, eliminating excitation current errors. Use Value: ±3.5 ppm INL typical and 0.5 ppm/°C gain drift ensure factory calibration remains valid across full industrial temperature range. |
Use Scenario: High-precision benchtop or platform scale using 350 Ω strain gauge bridge with 2 mV/V sensitivity. IC Role / Device Role / Timing Role: Precision differential ADC with internal reference - rejects common-mode noise from long sensor cables and provides ratiometric stability vs. supply variation. Use Value: 110 dB CMR at 50/60 Hz and 100 dB DC CMR suppress bridge offset drift induced by ground loops in multi-sensor installations. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar sigma-delta ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD7790BRMZ | No VDD monitor channel; no internal clock oscillator - requires external clock source; 16-bit resolution; 1.5 µV rms noise at 16.6 Hz. | Lacks integrated supply monitoring and clock - unsuitable for self-contained battery health reporting or clock-free designs. | Select AD7790BRMZ only if 16-bit resolution suffices and external clock infrastructure already exists. |
| ADS124S08IPW | 24-bit delta-sigma ADC with PGA (1–128×), 4-channel MUX, and 2.5 V internal reference - 0.7 µV rms noise at 20 SPS; 16-pin TSSOP. | Includes programmable gain and multiplexing - better suited for multi-sensor systems but consumes 250 µA (vs. 75 µA) in active mode. | Choose ADS124S08IPW when multi-channel scanning or signal conditioning is required; AD7791BRMZ-REEL is optimal for single-channel ultra-low-power use. |
Compared with AD7790BRMZ and ADS124S08IPW, AD7791BRMZ-REEL uniquely balances ultra-low quiescent current (75 µA), integrated clock, VDD monitoring, and 19.5-bit p-p resolution in a 10-lead MSOP - making it the most compact, self-contained solution for single-input, battery-sensitive measurement nodes.
Availability
AD7791BRMZ-REEL is available at Aetrix Electronics and suitable for smart transmitters, portable instrumentation, and sensor measurement systems requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for AD7791BRMZ-REEL 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 Wilmington, MA.
The AD7791BRMZ-REEL belongs to Analog Devices' precision sigma-delta ADC product line, designed specifically for low-frequency, high-resolution measurement in resource-constrained industrial and portable systems.
FAQ
What is the maximum update rate supported by the AD7791BRMZ-REEL?
The AD7791BRMZ-REEL supports a maximum output update rate of 120 Hz, configurable via the Filter Register's FS[2:0] bits. At this rate, rms noise increases to approximately 3.5 µV, trading resolution for speed - ideal for dynamic pressure sensing where response time outweighs absolute precision. The AD7791BRMZ-REEL maintains simultaneous 50/60 Hz rejection even at higher rates when FS[2:0] = 000.
Does the AD7791BRMZ-REEL require an external clock source?
No, the AD7791BRMZ-REEL includes a fully integrated internal clock oscillator, eliminating the need for external crystals, oscillators, or clock generators. This simplifies design, reduces bill-of-materials cost, and improves reliability in vibration-prone or space-constrained applications. Clock division (CDIV[1:0]) is software-configurable to reduce power consumption proportionally.
How does the VDD monitor channel function in the AD7791BRMZ-REEL?
The AD7791BRMZ-REEL's VDD monitor channel (selected via CH1=CH0=11b in the Communications Register) internally divides the VDD supply by 5 and converts it using a 1.17 V ±5% on-chip reference. This enables real-time battery voltage tracking without external resistive dividers - critical for predicting end-of-life in coin-cell or Li-ion powered devices. The result appears in the 24-bit Data Register like any other conversion.
Can the AD7791BRMZ-REEL operate with a 2.5 V supply?
Yes, the AD7791BRMZ-REEL is fully specified for operation from 2.5 V to 5.25 V. At 2.5 V, typical supply current is 65 µA in unbuffered mode and 130 µA in buffered mode. Input voltage limits remain GND + 100 mV to VDD – 100 mV in buffered mode, enabling compatibility with low-voltage sensors and energy-harvesting sources.
What is the purpose of the DOUT/RDY pin on the AD7791BRMZ-REEL?
The DOUT/RDY pin on the AD7791BRMZ-REEL serves a dual function: it outputs serial data during read operations and asserts a low-active "data ready" signal upon conversion completion. This eliminates the need for polling the Status Register's RDY bit or dedicating a separate GPIO for interrupt signaling - streamlining firmware design in microcontroller-based sensor nodes using the AD7791BRMZ-REEL.
AD7791BRMZ-REEL Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Number of Bits:
- 24
- Sampling Rate (Per Second):
- 120
- Number of Inputs:
- 1
- Input Type:
- Differential
- Data Interface:
- SPI, DSP
- Configuration:
- ADC
- Ratio - S/H:ADC:
- -
- Number of A/D Converters:
- 1
- Architecture:
- Sigma-Delta
- Reference Type:
- External
- Voltage - Supply, Analog:
- 2.5V ~ 5.25V
- Voltage - Supply, Digital:
- 2.5V ~ 5.25V
- Features:
- -
- Operating Temperature:
- -40°C ~ 105°C
- Supplier Device Package:
- 10-MSOP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
AD7791BRMZ-REEL FAQ
1.How can I place an order for AD7791BRMZ-REEL through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7791BRMZ-REEL 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 AD7791BRMZ-REEL reliable?
The price and inventory of AD7791BRMZ-REEL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7791BRMZ-REEL is usually 5 days.
3.What payment methods are accepted for AD7791BRMZ-REEL?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7791BRMZ-REEL transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7791BRMZ-REEL?
AD7791BRMZ-REEL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7791BRMZ-REEL 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 AD7791BRMZ-REEL?
For technical support, including AD7791BRMZ-REEL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7791BRMZ-REEL requirements.
6.How does Aetrix verify that AD7791BRMZ-REEL is sourced from the original manufacturer or authorized distributors?
All AD7791BRMZ-REEL 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 AD7791BRMZ-REEL meets industry standards.
7.What is the process for return or replacement of AD7791BRMZ-REEL?
All AD7791BRMZ-REEL units undergo pre-shipment inspection (PSI). If there is an issue with AD7791BRMZ-REEL, 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 AD7791BRMZ-REEL part is unused and in its original packaging.
Return procedure for AD7791BRMZ-REEL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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