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Analog Devices Inc. AD7782BRU-REEL
- Part No.:
- AD7782BRU-REEL
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 16-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
AD7782BRU-REEL.pdf
- Description:
- IC ADC 24BIT SIGMA-DELTA 16TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,702
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Product details
Overview
AD7782BRU-REEL from Analog Devices is a 24-bit sigma-delta analog-to-digital converter (ADC) designed for precision low-frequency sensor measurement. It features two fully differential input channels, pin-configurable ±160 mV or ±2.56 V input ranges, fixed 19.79 Hz output update rate, and simultaneous 50 Hz/60 Hz rejection - enabling high-accuracy weigh-scale and industrial process control applications.
For engineers reviewing the AD7782BRU-REEL datasheet, AD7782BRU-REEL pinout, AD7782BRU-REEL application, or AD7782BRU-REEL equivalent, this page delivers verified technical context, real-world design meaning of key specs, validated pin functions, confirmed alternatives, and supply-ready procurement details - all grounded in Analog Devices' official AD7782B specification data.
Technical Context
The AD7782BRU-REEL implements a fixed-rate sigma-delta modulator with on-chip PLL locked to a 32.768 kHz crystal, generating an internal 4.194304 MHz clock. Its digital filter places notches at both 50 Hz and 60 Hz, achieving ≥60 dB normal-mode rejection without software configuration.
All channel selection (AIN1/AIN2) and PGA gain setting (±160 mV / ±2.56 V) are controlled via dedicated logic pins (CH1/CH2 and RANGE), eliminating register programming. The read-only serial interface operates in master or slave mode, with DOUT/RDY serving dual data-output and ready-indication roles.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 24-bit no missing codes; ensures full dynamic range utilization without code gaps in precision weighing or RTD readout. |
| Update Rate | Fixed 19.79 Hz; enables deterministic timing for synchronized multi-channel sampling in PLC analog input modules. |
| Input Ranges | Pin-selectable ±160 mV (16.5-bit p-p) or ±2.56 V (18.5-bit p-p); supports direct connection to mV-output load cells and V-output pressure transducers without external gain stages. |
| Power Supply | Single 3 V or 5 V operation; 1.3 mA typical current at 3 V enables battery-powered portable instrumentation. |
| Common-Mode Rejection | ≥105 dB at DC (±160 mV range); rejects ground-loop noise in industrial sensor interfaces with long cable runs. |
| Normal-Mode Rejection | 60 dB @ 50 Hz, 94 dB @ 60 Hz; eliminates mains interference in factory-floor environments without external notch filters. |
| Reference Input | 2.5 V nominal differential reference (1 V to VDD functional range); allows ratiometric operation with bridge sensor excitation sources. |
Pinout & Package
AD7782BRU-REEL is housed in a 16-lead TSSOP (RU-16) package, 4.4 mm × 5.0 mm footprint, 0.65 mm pitch, with exposed pad not electrically connected.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| AIN1(+), AIN1(–) | Differential analog input channel 1 | Accepts ±160 mV or ±2.56 V signals; high-impedance buffered inputs tolerate >10 kΩ source impedance from strain gages or RTDs. |
| AIN2(+), AIN2(–) | Differential analog input channel 2 | Independent second channel; selected via CH1/CH2 pin; identical electrical specs to AIN1 for dual-sensor systems. |
| REFIN(+), REFIN(–) | Differential reference input | Unbuffered 2.5 V nominal reference; supports ratiometric configurations where excitation voltage also serves as reference. |
| CH1/CH2 | Channel select input | Logic-low selects AIN1; logic-high selects AIN2 - enables hardware-multiplexed dual-channel acquisition without microcontroller intervention. |
| RANGE | PGA gain configuration | Logic-low sets ±160 mV full-scale (gain = 16); logic-high sets ±2.56 V full-scale (gain = 1) - no firmware required. |
| MODE | Interface mode select | Logic-low configures master mode (SCLK output); logic-high enables slave mode (SCLK input) for flexible MCU integration. |
| DOUT/RDY | Serial data output / conversion ready indicator | Active-low RDY signal alerts host processor when 24-bit result is valid; also carries serial data in master/slave modes - reduces pin count. |
| CS | Chip select / power control | Active-low CS powers up PLL, initiates conversion, and wakes device; high state forces standby (9 µA) and three-states SCLK/DOUT. |
Key Features
| Feature | Design Value |
|---|---|
| Pin-configured channel & range selection | Eliminates firmware register writes - simplifies BOM and reduces qualification effort for safety-critical industrial designs. |
| Simultaneous 50 Hz and 60 Hz rejection | Hardware-filtered notch response removes mains interference globally - no calibration or adaptive filtering needed in mixed-region deployments. |
| 24-bit no missing codes with 18.5-bit p-p resolution | Guarantees monotonicity and usable resolution for 1:100,000+ dynamic range applications like laboratory-grade weigh scales. |
| Read-only SPI/QSPI/MICROWIRE-compatible interface | Supports legacy and modern controllers without protocol translation; Schmitt-triggered SCLK enables robust opto-isolated communication. |
| Rail-to-rail input buffer + PGA | Enables direct connection to unamplified sensors while maintaining linearity - avoids external op-amp stage and associated drift/noise errors. |
Applications
| Industrial Weigh Scales | Temperature Measurement (RTD) |
|---|---|
Use Scenario: High-precision platform scales in food processing plants requiring NTEP certification and 100,000:1 readability. IC Role / Device Role / Timing Role: Primary ADC capturing mV-level outputs from 350 Ω load cells at 20 Hz, rejecting 50/60 Hz ambient noise. Use Value: Fixed 19.79 Hz update rate and simultaneous dual-frequency rejection eliminate need for software averaging or external filters - reducing firmware complexity and validation scope. |
Use Scenario: 4-wire RTD temperature monitoring in HVAC control panels operating across global mains frequencies. IC Role / Device Role / Timing Role: Dual-channel ADC measuring RTD resistance and reference resistor simultaneously for ratio-metric cold-junction compensation. Use Value: Pin-selectable ±160 mV range matches typical RTD bridge outputs; common-mode rejection >105 dB suppresses shared-noise coupling in DIN-rail mounted enclosures. |
| Pressure Transducer Interfaces | Portable Battery-Powered Instruments |
Use Scenario: Industrial pressure transmitters with 4–20 mA loop-powered outputs requiring high-resolution local digitization. IC Role / Device Role / Timing Role: ADC front end converting amplified mV signals from piezoresistive sensors, rejecting EMI from nearby VFDs. Use Value: 16.5-bit p-p resolution at ±160 mV range resolves sub-0.01% FS pressure changes; 1.3 mA @ 3 V enables low-power loop-powered designs. |
Use Scenario: Handheld multimeters and calibration tools needing stable accuracy over battery discharge (3.6 V → 2.7 V). IC Role / Device Role / Timing Role: Low-power 24-bit ADC acquiring thermocouple and voltage measurements with minimal external components. Use Value: Specified operation from 2.7 V to 3.6 V and 9 µA power-down current extend battery life; no register programming reduces firmware memory footprint. |
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 |
|---|---|---|---|
| AD7783BRU-REEL | Same pinout and core architecture, but single-channel with integrated 100 µA/200 µA current sources for RTD excitation. | Optimized for 3-/4-wire RTD circuits; lacks second analog input channel of AD7782BRU-REEL. | Select AD7783BRU-REEL only when current-source excitation is required and dual-channel input is unnecessary. |
| ADS124S08IPW | 24-bit delta-sigma ADC with programmable registers, 4-channel mux, and integrated PGA (1–128), but requires SPI register writes. | Offers greater flexibility in gain/channel sequencing but increases firmware overhead and qualification burden. | Choose ADS124S08IPW when dynamic range adaptation or multi-sensor sequencing is needed; AD7782BRU-REEL preferred for fixed-function simplicity. |
Compared with AD7783BRU-REEL, AD7782BRU-REEL provides dual analog inputs at the cost of excitation current sources - making it superior for differential sensor pairs. Against ADS124S08IPW, AD7782BRU-REEL trades configurability for deterministic timing and zero-register firmware - critical for SIL-2 or IEC 61508-compliant systems.
Availability
AD7782BRU-REEL is available at Aetrix Electronics and suitable for industrial process control, weigh-scale manufacturing, and portable instrumentation requiring stable component supply across extended product lifecycles.
Supply support for AD7782BRU-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 is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, founded in 1965 and headquartered in Wilmington, MA.
The AD778x family - including AD7782BRU-REEL - was engineered specifically for high-accuracy, low-power, low-frequency sensor signal conditioning in industrial and instrumentation applications where simplicity, reliability, and noise immunity are paramount.
FAQ
What is the absolute maximum supply voltage for AD7782BRU-REEL?
The AD7782BRU-REEL has an absolute maximum VDD-to-GND rating of –0.3 V to +7 V. However, functional operation is specified only from 2.7 V to 3.6 V (3 V nominal) or 4.75 V to 5.25 V (5 V nominal). Exceeding these operational ranges may cause parametric degradation or latch-up, even if below the absolute maximum limit.
Does AD7782BRU-REEL require external programming to configure input range or channel selection?
No. AD7782BRU-REEL uses dedicated hardware pins (RANGE and CH1/CH2) for input range (±160 mV or ±2.56 V) and channel selection (AIN1 or AIN2). There are no internal registers to program - the device is truly read-only, eliminating firmware dependencies and initialization sequences.
Can AD7782BRU-REEL operate with a reference voltage other than 2.5 V?
Yes. While AD7782BRU-REEL is specified for optimal performance with a 2.5 V differential reference (REFIN(+) – REFIN(–)), it remains functional across 1 V to VDD. For ratiometric applications - such as bridge sensors excited by the same voltage - deviations from 2.5 V do not impact measurement accuracy.
What crystal frequency is required for AD7782BRU-REEL operation?
AD7782BRU-REEL requires a 32.768 kHz crystal connected between XTAL1 and XTAL2. This frequency is internally multiplied by a PLL to generate the 4.194304 MHz clock needed for the sigma-delta modulator. Using any other crystal frequency will prevent proper operation and invalidate timing specifications.
How does the DOUT/RDY pin function in master versus slave mode for AD7782BRU-REEL?
In master mode (MODE = 0), AD7782BRU-REEL drives SCLK and asserts DOUT/RDY low to signal valid data, then outputs 24 bits on the falling edge of each SCLK. In slave mode (MODE = 1), an external controller generates SCLK, and DOUT/RDY acts solely as a ready interrupt - going low when conversion completes and remaining low until data is read.
AD7782BRU-REEL Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 16-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Number of Bits:
- 24
- Sampling Rate (Per Second):
- 19.79
- Number of Inputs:
- 2
- Input Type:
- Differential
- Data Interface:
- SPI, DSP
- Configuration:
- MUX-PGA-ADC
- Ratio - S/H:ADC:
- -
- Number of A/D Converters:
- 1
- Architecture:
- Sigma-Delta
- Reference Type:
- External
- Voltage - Supply, Analog:
- 2.7V ~ 3.6V, 5V
- Voltage - Supply, Digital:
- 2.7V ~ 3.6V, 5V
- Features:
- PGA
- Operating Temperature:
- -40°C ~ 85°C
- Supplier Device Package:
- 16-TSSOP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
AD7782BRU-REEL FAQ
1.How can I place an order for AD7782BRU-REEL through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7782BRU-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 AD7782BRU-REEL reliable?
The price and inventory of AD7782BRU-REEL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7782BRU-REEL is usually 5 days.
3.What payment methods are accepted for AD7782BRU-REEL?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7782BRU-REEL transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7782BRU-REEL?
AD7782BRU-REEL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7782BRU-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 AD7782BRU-REEL?
For technical support, including AD7782BRU-REEL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7782BRU-REEL requirements.
6.How does Aetrix verify that AD7782BRU-REEL is sourced from the original manufacturer or authorized distributors?
All AD7782BRU-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 AD7782BRU-REEL meets industry standards.
7.What is the process for return or replacement of AD7782BRU-REEL?
All AD7782BRU-REEL units undergo pre-shipment inspection (PSI). If there is an issue with AD7782BRU-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 AD7782BRU-REEL part is unused and in its original packaging.
Return procedure for AD7782BRU-REEL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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