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Analog Devices Inc. AD7787BRMZ-RL
- Part No.:
- AD7787BRMZ-RL
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
AD7787BRMZ-RL.pdf
- Description:
- IC ADC 24BIT SIGMA-DELTA 10MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:10,738
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Product details
Overview
AD7787BRMZ-RL from Analog Devices is a low-power, 24-bit sigma-delta ADC with dual analog inputs (one differential AIN1±, one single-ended AIN2), rail-to-rail input buffer, internal clock oscillator, and VDD monitor channel - delivering 1.1 µV rms noise at 9.5 Hz update rate for high-precision sensor measurement in battery-powered instrumentation.
For engineers reviewing the AD7787BRMZ-RL datasheet, AD7787BRMZ-RL pinout, AD7787BRMZ-RL application, or AD7787BRMZ-RL equivalent, key selection criteria include simultaneous 50/60 Hz rejection, software-programmable update rate (9.5–120 Hz), buffered/unbuffered mode selection, 3-wire SPI-compatible interface, and operation from 2.5 V to 5.25 V supply.
Technical Context
The AD7787BRMZ-RL integrates a 24-bit Σ-Δ modulator with programmable digital filter, internal 1 MHz oscillator, and configurable input multiplexer supporting differential (AIN1) and single-ended (AIN2) acquisition. Its on-chip registers enable real-time control of conversion mode (continuous/single/power-down), unipolar/bipolar coding, and burnout current activation.
It implements simultaneous 50 Hz and 60 Hz line-frequency rejection via selectable filter settings (FS[2:0]), supports rail-to-rail buffered input with ±1 nA typical average input current, and features a dedicated VDD monitor channel using an internal 1.17 V reference - all within a 10-lead MSOP package rated for −40°C to +105°C operation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 19.5-bit p-p (22-bit effective) at 9.5 Hz - enables sub-microvolt-level signal resolution in low-bandwidth sensor systems. |
| RMS Noise | 1.1 µV at 9.5 Hz update rate - supports high-fidelity measurement of microvolt-level thermocouple or bridge outputs. |
| INL Error | ±15 ppm max (3.5 ppm typ.) - ensures accurate end-point linearity for precision weigh scale and pressure transducer calibration. |
| Power Consumption | 75 µA max normal mode, 1 µA max power-down - extends battery life in portable instrumentation and smart transmitters. |
| Update Rate Range | 9.5 Hz to 120 Hz, software-selectable - balances noise performance and throughput for varying sensor dynamics. |
| Common-Mode Rejection | 100 dB min at 50/60 Hz (buffered) - suppresses interference in noisy industrial environments with grounded sensors. |
| Reference Input Range | 0.1 V to VDD - allows flexible external reference selection or direct use of 2.5 V nominal REFIN for ratiometric sensing. |
Pinout & Package
AD7787BRMZ-RL is housed in a 10-lead MSOP (3 mm × 3 mm, 0.5 mm pitch) package with exposed pad for thermal enhancement and ESD robustness.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SCLK | Serial clock input | Schmitt-triggered for noise immunity; supports opto-isolated interfaces and continuous/noncontinuous clocking. |
| CS | Chip select (active low) | Enables 3-wire operation when hardwired low; serves as frame sync in multi-device SPI buses. |
| AIN1(+) | Differential input positive terminal | Accepts buffered or unbuffered signals up to VDD – 100 mV; used with AIN1(–) for bridge/thermocouple sensing. |
| AIN1(–) | Differential input negative terminal | Completes differential pair; supports bipolar input range ±REFIN in buffered mode. |
| REFIN | Reference voltage input | Accepts 0.1 V to VDD; sets full-scale range - enables ratiometric measurements with external sensor excitation. |
| AIN2 | Single-ended analog input | Supports unbuffered operation down to GND – 100 mV; used for VDD monitoring or auxiliary sensor channels. |
| GND | Analog/digital ground reference | Single ground pin shared by analog and digital sections; requires careful PCB layout separation per datasheet guidelines. |
| VDD | Supply voltage input | 2.5 V to 5.25 V operation; powers all circuitry including internal oscillator and buffer amplifier. |
| DOUT/RDY | Combined data output / conversion ready | Three-state serial output during CS high; active-low RDY pulse signals valid conversion completion for interrupt-driven reads. |
| DIN | Serial data input | Loads communications, mode, filter, and status register commands; accepts 8- or 24-bit writes per register mapping. |
Key Features
| Feature | Design Value |
|---|---|
| Simultaneous 50 Hz and 60 Hz rejection | Configurable via FS[2:0] bits - eliminates need for external notch filters in global industrial deployments. |
| Internal clock oscillator | 1 MHz fixed frequency - removes external crystal/clock source, reducing BOM count and board area. |
| Rail-to-rail input buffer | ±1 nA typical input bias current - enables high-impedance sensor interfacing without gain error from source resistance. |
| VDD monitor channel | On-chip 1.17 V reference and 5:1 divider - provides self-contained power supply health check without external components. |
| Low-power modes | CDIV1/CDIV0 programmable clock division (×2/×4/×8) - scales current consumption linearly with update rate reduction. |
| 3-wire SPI-compatible interface | Supports SCLK, DIN, DOUT/RDY with Schmitt-triggered SCLK - simplifies isolation and reduces GPIO count in microcontroller designs. |
Applications
| Smart Transmitters | Battery-Powered Instrumentation |
|---|---|
|
Use Scenario: 4–20 mA loop-powered field transmitter measuring temperature or pressure with HART communication. IC Role / Device Role / Timing Role: Primary analog front-end ADC acquiring sensor output and VDD for diagnostics; operates in continuous mode at 16.6 Hz. Use Value: Simultaneous 50/60 Hz rejection ensures stable readings in electrically noisy plant environments without external filtering. |
Use Scenario: Handheld multimeter or portable gas detector requiring >100-hour battery life and microvolt-level resolution. IC Role / Device Role / Timing Role: Low-noise signal digitizer for thermistor or electrochemical sensor; uses power-down mode between readings. Use Value: 1 µA power-down current and 75 µA active current enable ultra-low quiescent operation while maintaining 24-bit integrity. |
| Industrial Weigh Scales | Temperature/Pressure Sensors |
|
Use Scenario: Platform scale with load cell bridge output and auto-zero calibration routine. IC Role / Device Role / Timing Role: Differential ADC capturing bridge imbalance; uses internal buffer and 1.1 µV noise floor for sub-gram resolution. Use Value: 19.5-bit p-p resolution and ±15 ppm INL support NTEP Class III compliance without external calibration hardware. |
Use Scenario: RTD or thermocouple measurement module in HVAC or process control system. IC Role / Device Role / Timing Role: Dual-channel front-end converting both sensor signal (AIN1) and cold-junction compensation (AIN2). Use Value: Integrated VDD monitor and REFIN flexibility allow single-supply, ratiometric design with no external references or supervisors. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 24-bit sigma-delta ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD7170BRMZ | 24-bit, 100 SPS max, 1.5 µV rms noise, 16-pin TSSOP, no VDD monitor | Lacks integrated VDD monitor and single-ended AIN2 channel; requires external supervisor for power integrity checks | Preferred when higher throughput (100 SPS) is needed and VDD monitoring is handled externally |
| ADS124S08IPW | 24-bit, 4 kSPS max, PGA up to 128 V/V, 2.5 µV rms noise, 24-pin TSSOP | Includes programmable gain amplifier and more analog inputs but consumes 250 µA active current | Chosen when sensor signal conditioning requires on-chip amplification and higher speed outweighs power budget constraints |
Compared with AD7787BRMZ-RL, AD7170BRMZ offers higher speed but omits VDD monitoring and dual-input flexibility, while ADS124S08IPW adds PGA capability at significantly higher power and cost - making AD7787BRMZ-RL optimal for ultra-low-power, dual-channel, self-monitoring sensor nodes.
Availability
AD7787BRMZ-RL is available at Aetrix Electronics and suitable for smart transmitters, battery-powered instrumentation, and industrial weigh scales requiring stable component supply across long-lifecycle production programs.
Supply support for AD7787BRMZ-RL 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 AD7787BRMZ-RL belongs to Analog Devices' precision sigma-delta ADC product line, designed specifically for low-power, high-resolution measurement in constrained environments such as portable and loop-powered industrial sensors.
FAQ
What is the maximum update rate supported by the AD7787BRMZ-RL?
The AD7787BRMZ-RL supports a maximum output update rate of 120 Hz in normal mode. This rate is software-programmable via the filter register's FS[2:0] bits and scales with internal clock division settings. At 120 Hz, rms noise increases compared to the 9.5 Hz minimum setting, but the device maintains 24-bit no-missing-codes performance across the full range.
Does the AD7787BRMZ-RL require an external clock source?
No, the AD7787BRMZ-RL does not require an external clock source. It contains an internal 1 MHz oscillator that drives the sigma-delta modulator and digital filter. The user configures update rate and power savings solely through register settings - eliminating external timing components and simplifying layout.
Can the AD7787BRMZ-RL measure both differential and single-ended signals simultaneously?
The AD7787BRMZ-RL supports either differential (AIN1±) or single-ended (AIN2) acquisition per conversion, but not simultaneously in one cycle. Channel selection is controlled via CH1/CH0 bits in the communications register, and switching triggers filter reset. However, rapid alternation between AIN1 and AIN2 enables quasi-simultaneous dual-channel monitoring in systems like smart transmitters.
What is the purpose of the VDD monitor channel in the AD7787BRMZ-RL?
The VDD monitor channel in the AD7787BRMZ-RL uses an internal 1.17 V reference and 5:1 resistor divider to measure supply voltage without external components. When selected via CH1/CH0 = 11, it delivers a digitized representation of VDD scaled to the ADC's full-scale range - enabling real-time power integrity checks in battery-operated or loop-powered devices.
How does the AD7787BRMZ-RL achieve simultaneous 50 Hz and 60 Hz rejection?
The AD7787BRMZ-RL achieves simultaneous 50 Hz and 60 Hz rejection through its programmable digital filter architecture. By configuring FS[2:0] = 100, the filter provides 65 dB rejection at both frequencies; FS[2:0] = 101 or 011 further optimize rejection to 90 dB at 50 Hz or 60 Hz respectively - all without external hardware or firmware intervention.
AD7787BRMZ-RL 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:
- 2
- Input Type:
- Differential, Single Ended
- Data Interface:
- SPI, DSP
- Configuration:
- MUX-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:
- -
AD7787BRMZ-RL FAQ
1.How can I place an order for AD7787BRMZ-RL through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7787BRMZ-RL 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 AD7787BRMZ-RL reliable?
The price and inventory of AD7787BRMZ-RL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7787BRMZ-RL is usually 5 days.
3.What payment methods are accepted for AD7787BRMZ-RL?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7787BRMZ-RL transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7787BRMZ-RL?
AD7787BRMZ-RL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7787BRMZ-RL 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 AD7787BRMZ-RL?
For technical support, including AD7787BRMZ-RL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7787BRMZ-RL requirements.
6.How does Aetrix verify that AD7787BRMZ-RL is sourced from the original manufacturer or authorized distributors?
All AD7787BRMZ-RL 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 AD7787BRMZ-RL meets industry standards.
7.What is the process for return or replacement of AD7787BRMZ-RL?
All AD7787BRMZ-RL units undergo pre-shipment inspection (PSI). If there is an issue with AD7787BRMZ-RL, 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 AD7787BRMZ-RL part is unused and in its original packaging.
Return procedure for AD7787BRMZ-RL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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