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Analog Devices Inc. AD7790BRM
- Part No.:
- AD7790BRM
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
AD7790BRM.pdf
- Description:
- IC ADC 16BIT SIGMA-DELTA 10MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,557
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Product details
Overview
AD7790BRM from Analog Devices is a low-power, 16-bit buffered sigma-delta ADC with integrated PGA (gains 1–8), rail-to-rail input buffer, internal clock oscillator, and VDD monitor channel. It delivers 1.1 µV rms noise at 9.5 Hz update rate, ±3.5 ppm INL typical, and simultaneous 50/60 Hz rejection - optimized for precision sensor measurement in battery-powered instrumentation.
For engineers reviewing the AD7790BRM datasheet, AD7790BRM pinout, AD7790BRM application, or AD7790BRM equivalent, key selection criteria include its 10-lead MSOP package, 3-wire SPI-compatible serial interface, 2.5–5.25 V supply range, 75 µA max normal current, and programmable update rates from 9.5 Hz to 120 Hz with configurable filter settings.
Technical Context
The AD7790BRM implements a single-channel, fully differential sigma-delta modulator with on-chip digital filtering and a programmable gain amplifier supporting gains of 1, 2, 4, and 8. Its internal clock eliminates external timing components, and output word rate is set via the 3-bit FS[2:0] field in the filter register.
It operates in buffered or unbuffered mode (configurable via BUF bit), supports bipolar input configuration, and includes dedicated VDD monitoring (CH1/CH0 = 11). Simultaneous 50 Hz and 60 Hz rejection is achieved through selectable notch filter configurations tied directly to the update rate setting.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 16-bit p-p at 9.5 Hz - ensures stable digitization of microvolt-level sensor signals without missing codes. |
| RMS Noise | 1.1 µV at 9.5 Hz - enables sub-10 µV system-level resolution in low-frequency industrial sensing. |
| Integral Nonlinearity | ±3.5 ppm typical - supports high-accuracy weigh scale and pressure transducer calibration without frequent recalibration. |
| Update Rate Range | 9.5 Hz to 120 Hz - software-selectable to balance noise performance, power, and line-cycle rejection requirements. |
| Supply Current | 75 µA max normal / 1 µA max power-down - extends battery life in portable instrumentation and smart transmitters. |
| Input Buffer | Rail-to-rail, enabled/disabled via BUF bit - allows direct connection to high-impedance sensors without gain error. |
| Reference Input Range | 0.1 V to VDD - supports flexible reference sourcing including internal bandgap or external precision references. |
Pinout & Package
AD7790BRM is housed in a 10-lead MSOP (3 mm × 3 mm) package with exposed pad for thermal enhancement. Pin functions are validated per Analog Devices AD7790 Rev. A datasheet Figure 5 and Table 4.
| 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. |
| AIN(+), AIN(–) | Differential analog input | Fully differential inputs support buffered/unbuffered modes; absolute voltage limits depend on buffer state. |
| REFIN(+), REFIN(–) | Differential reference input | Accepts 0.1 V to VDD reference span; common-mode range extends beyond supply rails by ±30 mV. |
| GND | Analog/digital ground reference | Single ground pin requires careful PCB layout separation between analog and digital return paths. |
| VDD | Power supply | 2.5 V to 5.25 V operation; powers analog and digital sections; monitored internally for supply integrity. |
| DOUT/RDY | Combined data output & conversion ready | Functions as serial data output (MSB-first) and open-drain RDY signal; falling edge triggers processor interrupt. |
| DIN | Serial data input | Loads communications, mode, and filter register commands; accepts 8- or 16-bit writes per register protocol. |
Key Features
| Feature | Design Value |
|---|---|
| Internal clock oscillator | Eliminates external crystal/clock source - reduces BOM count and layout complexity in space-constrained designs. |
| Programmable gain amplifier (PGA) | Gains of 1, 2, 4, 8 allow direct interfacing with mV-output sensors (e.g., load cells, RTDs) without external amplification. |
| Rail-to-rail input buffer | Supports high-impedance sources up to 1 GΩ without gain error; enables direct connection to thermocouples and bridge sensors. |
| VDD monitor channel | Measures supply voltage (divided by 5) using internal 1.17 V reference - provides real-time power integrity feedback without external components. |
| Simultaneous 50/60 Hz rejection | Configurable via FS bits - achieves ≥65 dB rejection at both line frequencies without external notch filters or DSP post-processing. |
Applications
| Smart Transmitters | Battery-Powered Instrumentation |
|---|---|
|
Use Scenario: 4–20 mA loop-powered field transmitter measuring temperature or pressure in hazardous environments. IC Role / Device Role / Timing Role: Primary analog front-end ADC converting sensor output to digital for HART modulation and microcontroller processing. Use Value: 75 µA max supply current and 1 µA power-down mode extend loop-powered operation; internal clock simplifies certification for intrinsic safety. |
Use Scenario: Handheld multimeter or portable gas detector requiring >1-year battery life on two AA cells. IC Role / Device Role / Timing Role: Low-noise, low-power ADC digitizing sensor outputs with minimal wake-up overhead. Use Value: 1.1 µV rms noise at 9.5 Hz enables µV-level resolution; programmable update rate allows dynamic power/performance trade-offs during measurement cycles. |
| Temperature Measurement Systems | Weigh Scales & Load Cells |
|
Use Scenario: Industrial oven controller using PT100 RTD with 4-wire connection and cold-junction compensation. IC Role / Device Role / Timing Role: Precision delta-sigma converter with PGA and buffer for direct RTD excitation and ratiometric measurement. Use Value: ±3.5 ppm INL and 16-bit p-p resolution support Class A RTD accuracy; simultaneous 50/60 Hz rejection suppresses EMI from heating elements. |
Use Scenario: Platform scale with full-scale capacity of 100 kg and 1 g resolution, powered from AC adapter or rechargeable battery. IC Role / Device Role / Timing Role: High-resolution ADC capturing millivolt-level bridge outputs with integrated gain and filtering. Use Value: PGA gains up to 8 eliminate need for external instrumentation amplifier; 16-bit p-p resolution ensures 100,000-count display capability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision sigma-delta ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD7791BRMZ | 2-channel version with identical 16-bit resolution, noise, and power specs; shares same pinout and register map except for additional CHSEL bits. | Required when dual independent sensor inputs (e.g., temperature + humidity) must be sampled synchronously without multiplexing delay. | Select AD7791BRMZ only if second analog input channel is needed; otherwise AD7790BRM offers lower cost and smaller footprint. |
| ADS1115IDGSR | 16-bit, 860-SPS max, I²C interface, no internal oscillator; 150 µA typical supply current; lacks simultaneous 50/60 Hz rejection and VDD monitor. | Suitable for non-critical, higher-speed applications where line-frequency rejection is handled externally or not required. | Choose ADS1115IDGSR for I²C-based systems with less stringent noise/line-rejection needs; AD7790BRM remains superior for certified industrial sensor nodes. |
Compared with AD7791BRMZ, AD7790BRM saves board space and cost in single-channel systems; compared with ADS1115IDGSR, it delivers lower noise, built-in line rejection, and true rail-to-rail buffered input - critical for metrology-grade sensor conditioning.
Availability
AD7790BRM is available at Aetrix Electronics and suitable for smart transmitters, battery-powered instrumentation, and precision temperature measurement requiring stable component supply across long production lifecycles.
Supply support for AD7790BRM 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 AD7790BRM belongs to Analog Devices' precision sigma-delta ADC product line, designed specifically for low-power, high-accuracy measurement of low-frequency industrial and scientific sensors.
FAQ
What is the maximum update rate supported by the AD7790BRM?
The AD7790BRM supports a maximum output update rate of 120 Hz in full-power mode with FS[2:0] = 000. At this rate, rms noise increases to 40 µV and 50/60 Hz rejection drops to 25 dB. The device maintains 16-bit p-p resolution across all update rates, and the actual conversion time scales linearly with clock division settings (CDIV1/CDIV0).
Does the AD7790BRM require an external clock source?
No, the AD7790BRM does not require an external clock source. It contains a fully integrated internal clock oscillator, eliminating the need for crystals, oscillators, or clock distribution circuitry. This simplifies design, reduces bill-of-materials cost, and improves reliability in harsh environments where external timing components may drift or fail.
Can the AD7790BRM measure its own supply voltage?
Yes, the AD7790BRM includes a dedicated VDD monitor channel (selected via CH1/CH0 = 11 in the communications register). It internally divides VDD by 5 and converts the result using its 1.17 V ±5% on-chip reference, enabling real-time supply voltage monitoring without external resistive dividers or additional ADC channels.
What is the purpose of the burnout current enable (BO) bit in the AD7790BRM?
The BO bit (Mode Register, MR3) enables 100 nA current sources at the AIN(+) and AIN(–) inputs - but only when the input buffer is active (BUF = 1). These currents detect open-circuit sensor conditions (e.g., broken RTD or thermocouple wires) by generating measurable voltage offsets, supporting diagnostic functionality in safety-critical measurement systems.
How does the AD7790BRM achieve simultaneous 50 Hz and 60 Hz rejection?
The AD7790BRM achieves simultaneous 50 Hz and 60 Hz rejection through its digital filter architecture, which is synchronized to the selected output word rate. When FS[2:0] = 100 (16.6 Hz update rate), the filter provides ≥65 dB rejection at both frequencies. This is implemented in hardware via notch placement in the sinc³ filter response - no firmware or external filtering is required.
AD7790BRM 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):
- 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:
- PGA
- Operating Temperature:
- -40°C ~ 105°C
- Supplier Device Package:
- 10-MSOP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
AD7790BRM FAQ
1.How can I place an order for AD7790BRM through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7790BRM 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 AD7790BRM reliable?
The price and inventory of AD7790BRM are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7790BRM is usually 5 days.
3.What payment methods are accepted for AD7790BRM?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7790BRM transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7790BRM?
AD7790BRM orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7790BRM 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 AD7790BRM?
For technical support, including AD7790BRM datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7790BRM requirements.
6.How does Aetrix verify that AD7790BRM is sourced from the original manufacturer or authorized distributors?
All AD7790BRM 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 AD7790BRM meets industry standards.
7.What is the process for return or replacement of AD7790BRM?
All AD7790BRM units undergo pre-shipment inspection (PSI). If there is an issue with AD7790BRM, 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 AD7790BRM part is unused and in its original packaging.
Return procedure for AD7790BRM:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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