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Analog Devices Inc. AD7788BRMZ
- Part No.:
- AD7788BRMZ
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
AD7788BRMZ.pdf
- Description:
- IC ADC 16BIT SIGMA-DELTA 10MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,202
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Product details
Overview
AD7788BRMZ from Analog Devices is a low-power, 16-bit sigma-delta analog-to-digital converter (ADC) with fully differential input, 16.6 Hz output update rate, 1.5 µV rms noise, and integrated internal clock oscillator. 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 AD7788BRMZ datasheet, AD7788BRMZ pinout, AD7788BRMZ application, or AD7788BRMZ equivalent, key selection considerations include its 10-lead MSOP package, simultaneous 50/60 Hz rejection, VDD monitor channel, SPI-compatible 3-wire serial interface, and guaranteed 16-bit no-missing-codes performance over −40°C to +105°C (B grade).
Technical Context
The AD7788BRMZ implements a first-order sigma-delta modulator followed by a digital sinc³ filter, delivering 16-bit p-p resolution at 16.6 Hz with inherent 50/60 Hz line frequency rejection. Its unbuffered differential input accepts ±REFIN ranges, and the on-chip VDD monitor channel enables supply voltage supervision without external components.
It uses an internal oscillator-no external clock required-and supports three operating modes via the mode register: continuous conversion (default), single conversion (1 ms wake-up), and power-down (1 µA). The DOUT/RDY pin serves dual function: data output and ready interrupt, synchronized to SCLK falling edges.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 16-bit p-p (guaranteed no missing codes); enables precise digitization of low-level sensor outputs without dithering. |
| Output Update Rate | 16.6 Hz nominal; provides inherent simultaneous 50 Hz and 60 Hz rejection for industrial AC-noise environments. |
| RMS Noise | 1.5 µV typical (at VDD = 3 V, VREF = 2.5 V); supports sub-µV-level signal resolution in high-precision weigh scales and RTD interfaces. |
| Supply Current | ≤75 µA max (normal mode); allows multi-year operation on coin-cell batteries in portable transmitters. |
| Power-Down Current | ≤1 µA max; enables ultra-low-quiescent monitoring during sleep intervals in energy-harvesting systems. |
| Integral Nonlinearity | ±15 ppm of FSR max (B grade); ensures <0.002% end-point error across full temperature range (−40°C to +105°C). |
| Input Voltage Range | ±REFIN differential (REFIN = 0.1 V to VDD); supports flexible reference scaling from 200 mV to 5.25 V for optimized SNR. |
Pinout & Package
AD7788BRMZ 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 a dot; pin numbering follows standard MSOP top-view convention.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SCLK | Serial clock input | Schmitt-triggered input enables robust timing in noisy environments and supports opto-isolated interfaces; falling edge clocks data out. |
| CS | Chip select (active low) | Enables 3-wire operation when hardwired low; acts as frame sync in multi-device SPI buses. |
| AIN(+), AIN(−) | Differential analog input | Unbuffered inputs accept ±REFIN range; high common-mode rejection (>100 dB at 50/60 Hz) suppresses sensor cable noise. |
| REFIN(+), REFIN(−) | Differential reference input | Defines full-scale range; supports external references down to 0.1 V; internal 1.17 V reference used for VDD monitor channel. |
| GND | Analog/digital ground reference | Single ground pin requires star grounding near device; separates analog and digital return paths internally. |
| VDD | Power supply | 2.5 V to 5.25 V single supply powers analog core, digital logic, and reference circuitry; VDD monitor channel measures scaled supply voltage. |
| DOUT/RDY | Combined data output / ready indicator | Outputs conversion result on SCLK falling edge; asserts low to signal valid data; functions as interrupt to host MCU. |
| DIN | Serial data input | Accepts 8-bit communications register writes and 8-/16-/24-bit register reads/writes; high-impedance when CS is high. |
Key Features
| Feature | Design Value |
|---|---|
| Simultaneous 50 Hz and 60 Hz rejection | Enabled by fixed 16.6 Hz output rate and sinc³ filter; eliminates need for external notch filters in global industrial deployments. |
| Integrated VDD monitor channel | Measures supply voltage (divided by 5) using internal 1.17 V reference; provides self-contained power supervision without external resistors. |
| Low-noise, unbuffered differential input | 1.5 µV rms noise + 100 dB CMRR at 50/60 Hz enables direct connection to bridge sensors (e.g., load cells) without front-end amplification. |
| Internal clock oscillator | Removes requirement for external crystal or clock generator; reduces BOM count and PCB area in space-constrained modules. |
| Three operating modes | Continuous, single-conversion (1 ms wake-up), and power-down (1 µA); supports adaptive power management in duty-cycled sensor nodes. |
Applications
| Smart Transmitters | Battery-Powered Instrumentation |
|---|---|
Use Scenario: 4–20 mA loop-powered pressure or temperature transmitter with HART modulation capability. IC Role / Device Role / Timing Role: Primary ADC digitizing conditioned sensor output; provides stable 16-bit readings synchronized to internal 16.6 Hz clock. Use Value: Simultaneous 50/60 Hz rejection ensures immunity to AC mains interference in field installations; low 75 µA current draw extends loop compliance margin. |
Use Scenario: Handheld multimeter or portable gas detector requiring >100-hour battery life on CR2032. IC Role / Device Role / Timing Role: Low-power front-end ADC sampling thermistor or electrochemical sensor outputs at 16.6 Hz. Use Value: 1 µA power-down current enables microcontroller-controlled wake-up; internal VDD monitor validates battery health before each measurement cycle. |
| Weigh Scales | Temperature Measurement Systems |
Use Scenario: Platform scale or retail checkout scale using strain-gauge load cell with 2 mV/V sensitivity. IC Role / Device Role / Timing Role: High-resolution ADC capturing differential bridge output; rejects 50/60 Hz noise induced by lighting or motors. Use Value: 1.5 µV rms noise and 16-bit no-missing-codes guarantee 1:65,536 dynamic range; unbuffered input avoids gain error from op-amp offset drift. |
Use Scenario: Industrial RTD or thermocouple measurement module with cold-junction compensation. IC Role / Device Role / Timing Role: Precision ADC digitizing ratiometric voltage from PT100 bridge or amplified thermocouple output. Use Value: ±15 ppm INL ensures <0.002% full-scale error over −40°C to +105°C; REFIN range flexibility supports 2.048 V or 2.5 V reference ICs. |
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 | 16-bit, same 16.6 Hz update rate, but includes programmable gain amplifier (PGA) with gains up to 128; higher supply current (115 µA). | Required when sensor output is <10 mV full-scale; not suitable if direct connection to bridge or RTD is preferred. | Select AD7790BRMZ only when PGA gain is needed; AD7788BRMZ offers lower power and simpler signal chain for ≥100 mV signals. |
| ADS1115IDGSR | 16-bit, 860 SPS max, I²C interface, no internal oscillator; requires external clock; 150 µA active current; different pinout (10-pin VSSOP). | Used where I²C bus availability and higher throughput outweigh need for 50/60 Hz rejection and ultra-low power. | Choose ADS1115IDGSR for I²C-based designs needing >16.6 Hz sampling; AD7788BRMZ remains optimal for AC-noise-prone, battery-critical 50/60 Hz rejection use cases. |
Compared with AD7790BRMZ and ADS1115IDGSR, the AD7788BRMZ uniquely combines guaranteed 50/60 Hz rejection, 1 µA power-down, and SPI-compatible 3-wire interface in a 10-lead MSOP-making it the most power-efficient and noise-immune choice for fixed-rate, low-bandwidth industrial sensing.
Availability
AD7788BRMZ is available at Aetrix Electronics and suitable for smart transmitters, battery-powered instrumentation, and precision weigh scales requiring stable component supply, long-lifecycle support, and consistent parametric performance across production batches.
Supply support for AD7788BRMZ 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 AD7788BRMZ belongs to Analog Devices' precision sigma-delta ADC product line, designed specifically for low-frequency, high-accuracy measurement of sensors in harsh industrial and portable environments.
FAQ
What is the guaranteed operating temperature range for AD7788BRMZ?
The AD7788BRMZ is specified for the B grade temperature range of −40°C to +105°C. This rating is production-tested and guaranteed across all electrical parameters in the datasheet, including integral nonlinearity (±15 ppm), noise (1.5 µV rms), and supply current (≤75 µA). The part number suffix "BRMZ" explicitly denotes the B-grade 10-lead MSOP variant.
Does AD7788BRMZ require an external clock source?
No, AD7788BRMZ does not require an external clock source. It contains a fully integrated internal oscillator that drives the sigma-delta modulator and digital filter at a fixed 16.6 Hz output update rate. This eliminates the need for crystals, oscillators, or clock distribution circuitry-reducing system cost, board area, and potential EMI sources in the AD7788BRMZ design.
How does the VDD monitor channel function in AD7788BRMZ?
The AD7788BRMZ VDD monitor channel measures the supply voltage by dividing VDD by 5 internally and converting it using the on-chip 1.17 V reference. When CH1/CH0 = 11 in the communications register, the ADC performs this measurement instead of sampling AIN(+)/AIN(−). The result appears in the data register as a 16-bit code proportional to VDD, enabling real-time supply supervision without external components.
Can AD7788BRMZ interface directly with a microcontroller's SPI peripheral?
Yes, AD7788BRMZ is fully compatible with standard SPI peripherals. It uses a 3-wire interface (SCLK, DIN, DOUT/RDY) with CS as chip select, supports SPI, QSPI™, MICROWIRE™, and DSP protocols, and features Schmitt-triggered SCLK for noise immunity. The DOUT/RDY pin outputs data on SCLK falling edges and can assert RDY as an interrupt-enabling seamless integration with most ARM Cortex-M or PIC microcontrollers.
What is the absolute maximum input voltage range for AIN(+) and AIN(−) pins on AD7788BRMZ?
The absolute maximum analog input voltage range for AIN(+) and AIN(−) on AD7788BRMZ is GND − 0.3 V to VDD + 0.3 V, per the Absolute Maximum Ratings table. However, the functional differential input range is ±REFIN (e.g., ±2.5 V with 2.5 V reference), and the common-mode input range is GND to VDD. Exceeding the absolute maximum ratings-even momentarily-may cause permanent damage to the AD7788BRMZ.
AD7788BRMZ 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:
- Active
- 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:
- -
AD7788BRMZ FAQ
1.How can I place an order for AD7788BRMZ through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7788BRMZ 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 AD7788BRMZ reliable?
The price and inventory of AD7788BRMZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7788BRMZ is usually 5 days.
3.What payment methods are accepted for AD7788BRMZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7788BRMZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7788BRMZ?
AD7788BRMZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7788BRMZ 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 AD7788BRMZ?
For technical support, including AD7788BRMZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7788BRMZ requirements.
6.How does Aetrix verify that AD7788BRMZ is sourced from the original manufacturer or authorized distributors?
All AD7788BRMZ 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 AD7788BRMZ meets industry standards.
7.What is the process for return or replacement of AD7788BRMZ?
All AD7788BRMZ units undergo pre-shipment inspection (PSI). If there is an issue with AD7788BRMZ, 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 AD7788BRMZ part is unused and in its original packaging.
Return procedure for AD7788BRMZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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