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Analog Devices Inc. AD7788BRM
- Part No.:
- AD7788BRM
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
AD7788BRM.pdf
- Description:
- IC ADC 16BIT SIGMA-DELTA 10MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,839
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Product details
Overview
AD7788BRM from Analog Devices is a low-power, 16-bit sigma-delta analog-to-digital converter (ADC) with differential input, 16.6 Hz output update rate, 1.5 µV rms noise, and integrated VDD monitor channel. It operates from a single 2.5 V to 5.25 V supply, consumes ≤75 µA in normal mode, and targets precision sensor measurement in battery-powered instrumentation.
For engineers reviewing the AD7788BRM datasheet, AD7788BRM pinout, AD7788BRM application, or AD7788BRM equivalent, key selection criteria include its 16-bit p-p resolution, simultaneous 50/60 Hz rejection, internal clock oscillator, 10-lead MSOP package, and SPI-/QSPI-/MICROWIRE-compatible 3-wire serial interface.
Technical Context
The AD7788BRM implements a first-order sigma-delta modulator followed by a digital sinc³ filter, delivering 16-bit no-missing-codes performance with 16.6 Hz fixed output rate. Its internal clock eliminates external timing components, and the modulator resets automatically on channel change or mode register write.
It supports unipolar/bipolar coding via the U/B bit in the mode register, includes a dedicated VDD monitor channel (CH1/CH0 = 11), and features Schmitt-triggered SCLK for robust opto-isolated interfacing. The DOUT/RDY pin serves dual roles: data output and conversion-ready interrupt.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 16-bit p-p (guaranteed no missing codes); enables 1 part in 65,536 dynamic range for DC-coupled sensor signals |
| Output Update Rate | 16.6 Hz fixed rate; provides inherent simultaneous 50 Hz and 60 Hz line-frequency rejection without external filtering |
| RMS Noise | 1.5 µV rms (typical); supports sub-µV-level signal resolution in low-bandwidth industrial sensing |
| Supply Current | ≤75 µA (max) at 3.6 V; enables multi-year operation on coin-cell batteries in portable transmitters |
| Integral Nonlinearity | ±15 ppm of FSR (max, B grade); ensures <0.002% gain error across full-scale range for calibrated weigh scales |
| Reference Range | 0.1 V to VDD; allows flexible use of internal 2.5 V reference or external low-voltage references down to 100 mV |
| Operating Temp | −40°C to +105°C (B grade); qualified for deployment in automotive engine compartments and industrial field sensors |
Pinout & Package
AD7788BRM is housed in a 10-lead MSOP (3 mm × 3 mm, 0.5 mm pitch) package with exposed pad for thermal enhancement. Pin 1 is marked with dot; pin numbering follows standard MSOP top-view convention.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SCLK | Serial clock input | Schmitt-triggered input accepts slow/noisy clocks; supports opto-isolation and eliminates need for external debouncing |
| CS | Chip select (active low) | Enables 3-wire operation when hardwired low; acts as frame sync in multi-device SPI buses |
| AIN(+) | Positive analog input | Differential input terminal; unbuffered, high-impedance (±400 nA/V typical input current) |
| AIN(–) | Negative analog input | Differential input terminal; forms fully differential front end with AIN(+) for common-mode noise rejection |
| REFIN(+) | Positive reference input | Accepts 0.1 V to VDD; nominal 2.5 V reference defines full-scale range (±REFIN differential input range) |
| REFIN(–) | Negative reference input | Ground-referenced or floating; sets reference common-mode point; must be within GND to VDD − 0.1 V |
| GND | Analog/digital ground | Single ground pin; requires star grounding near device for optimal noise performance |
| VDD | Power supply | 2.5 V to 5.25 V single supply; powers analog and digital sections; monitored internally for supply integrity |
| DOUT/RDY | Combined data output / ready indicator | Active-low RDY pulse signals conversion completion; outputs serial data during read cycles; three-states when CS high |
| DIN | Serial data input | Loads communications and mode registers; accepts 8-bit or 16-bit commands; DIN high for ≥32 cycles resets interface |
Key Features
| Feature | Design Value |
|---|---|
| Internal clock oscillator | Eliminates external crystal/clock source; reduces BOM count and PCB area in space-constrained modules |
| VDD monitor channel | Measures divided-down supply voltage (VDD/5) using on-chip 1.17 V reference; enables real-time power health monitoring without external dividers |
| Simultaneous 50 Hz/60 Hz rejection | Fixed 16.6 Hz update rate ensures integer number of line cycles per conversion; removes need for software notch filters or external analog traps |
| 3-wire SPI-compatible interface | Supports direct connection to microcontrollers with SPI, QSPI, MICROWIRE, or DSP serial ports; Schmitt-triggered SCLK tolerates slow rise/fall times |
| Low-power power-down mode | 1 µA max quiescent current; allows rapid wake-up (1 ms startup) in event-driven sensor nodes to extend battery life |
Applications
| Smart Transmitters | Battery-Powered Instrumentation |
|---|---|
Use Scenario: 4–20 mA loop-powered pressure or temperature transmitter operating in hazardous industrial zones. IC Role / Device Role / Timing Role: Primary ADC digitizing bridge sensor output; performs ratiometric conversion against stable reference; internal clock synchronizes sampling to line frequency. Use Value: 16-bit resolution and 1.5 µV noise enable <0.1% FS accuracy over temperature; 75 µA supply current extends loop-powered operation beyond 4 mA compliance limit. |
Use Scenario: Handheld multimeter or portable gas detector powered by two AA cells with 10-year shelf life requirement. IC Role / Device Role / Timing Role: Low-noise front-end ADC acquiring thermocouple or electrochemical sensor signals; enters 1 µA power-down between measurements. Use Value: Simultaneous 50/60 Hz rejection eliminates need for external line-filtering hardware; VDD monitor validates battery health before each reading. |
| Temperature Measurement Systems | Weigh Scales & Load Cells |
Use Scenario: RTD-based temperature controller in HVAC equipment requiring NIST-traceable calibration stability. IC Role / Device Role / Timing Role: Precision ADC converting 4-wire RTD voltage; uses internal reference for ratiometric accuracy; unipolar/bipolar configuration supports offset compensation. Use Value: ±15 ppm INL and 0.5 ppm/°C gain drift ensure <0.05°C system error over −40°C to +105°C; differential input rejects common-mode noise from long sensor leads. |
Use Scenario: Platform scale with strain-gauge load cell in retail or medical environments demanding legal-for-trade certification. IC Role / Device Role / Timing Role: High-stability ADC capturing microvolt-level bridge outputs; internal clock prevents jitter-induced quantization noise in 16.6 Hz continuous mode. Use Value: 16-bit p-p resolution resolves <10 µV changes; 90 dB CMRR at DC suppresses EMI from nearby motors or switching supplies. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar sigma-delta ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD7789BRM | 24-bit resolution, 19-bit p-p, higher noise floor (1.5 µV rms same), identical pinout and interface | Required for applications needing >16-bit dynamic range (e.g., high-precision weigh scales, laboratory instruments) | Select AD7789BRM when resolution >16 bits is mandatory; otherwise AD7788BRM offers lower cost and equal power/performance for 16-bit systems |
| ADS1115IDGSR | 16-bit, I²C interface, programmable gain amplifier (PGA), 860 SPS max, no internal oscillator | Preferred where I²C bus availability, PGA flexibility, or higher throughput (>16.6 Hz) is needed | Choose ADS1115IDGSR for I²C-based designs or when PGA gain adjustment is required; AD7788BRM remains optimal for SPI-based, ultra-low-power, line-rejection-critical systems |
Compared with AD7788BRM, AD7789BRM delivers higher resolution but shares identical power, noise, and rejection specs-making it a drop-in upgrade only when bit depth is limiting. ADS1115IDGSR trades fixed-line-rejection and lower quiescent current for I²C convenience and PGA integration, requiring external clocking and offering no simultaneous 50/60 Hz rejection.
Availability
AD7788BRM is available at Aetrix Electronics and suitable for smart transmitters, battery-powered instrumentation, and temperature measurement systems requiring stable component supply, long-lifecycle support, and guaranteed traceable sourcing.
Supply support for AD7788BRM 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 centers worldwide.
The AD7788BRM belongs to Analog Devices' precision sigma-delta ADC product line, engineered specifically for low-power, high-accuracy DC and low-frequency sensor signal acquisition in industrial and instrumentation applications.
FAQ
What is the maximum sampling rate of the AD7788BRM?
The AD7788BRM has a fixed output update rate of 16.6 Hz. This rate is determined by its internal clock and sinc³ digital filter architecture. It cannot be programmed to higher rates. The 16.6 Hz rate ensures inherent simultaneous rejection of both 50 Hz and 60 Hz power-line interference without requiring external filtering or software post-processing.
Does the AD7788BRM require an external crystal or clock source?
No, the AD7788BRM does not require an external crystal or clock source. It contains a fully integrated internal clock oscillator. This eliminates the need for external timing components, reduces bill-of-materials cost, simplifies PCB layout, and improves reliability in vibration-prone or space-constrained applications such as portable instrumentation and smart transmitters.
How does the VDD monitor function work in the AD7788BRM?
The AD7788BRM's VDD monitor channel (selected via CH1/CH0 = 11 in the communications register) measures a divided-down version of the supply voltage (VDD/5) using an internal 1.17 V ±5% bandgap reference. This allows real-time monitoring of supply integrity without external resistive dividers. The resulting digital code reflects VDD level and can trigger alerts or calibration adjustments in battery-powered systems.
What are the supported serial interface protocols for the AD7788BRM?
The AD7788BRM supports 3-wire SPI-compatible serial communication, including native compatibility with SPI, QSPI™, MICROWIRE, and DSP serial interfaces. Its Schmitt-triggered SCLK input enhances noise immunity, and the CS pin enables both multi-device bus sharing and simplified 3-wire operation when hardwired low-making it adaptable to diverse microcontroller platforms without protocol translation.
Can the AD7788BRM operate with a 2.5 V supply voltage?
Yes, the AD7788BRM is fully specified to operate from a single supply voltage ranging from 2.5 V to 5.25 V. At 2.5 V, it maintains ≤75 µA supply current and retains all key specifications including 16-bit p-p resolution, 1.5 µV rms noise, and simultaneous 50/60 Hz rejection. This makes it suitable for low-voltage battery systems such as those using lithium-thionyl chloride or alkaline primary cells.
AD7788BRM Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Number of Bits:
- 16
- Sampling Rate (Per Second):
- 16.6
- 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 ~ 85°C
- Supplier Device Package:
- 10-MSOP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
AD7788BRM FAQ
1.How can I place an order for AD7788BRM through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7788BRM 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 AD7788BRM reliable?
The price and inventory of AD7788BRM are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7788BRM is usually 5 days.
3.What payment methods are accepted for AD7788BRM?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7788BRM transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7788BRM?
AD7788BRM orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7788BRM 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 AD7788BRM?
For technical support, including AD7788BRM datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7788BRM requirements.
6.How does Aetrix verify that AD7788BRM is sourced from the original manufacturer or authorized distributors?
All AD7788BRM 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 AD7788BRM meets industry standards.
7.What is the process for return or replacement of AD7788BRM?
All AD7788BRM units undergo pre-shipment inspection (PSI). If there is an issue with AD7788BRM, 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 AD7788BRM part is unused and in its original packaging.
Return procedure for AD7788BRM:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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