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Analog Devices Inc. AD7782BRUZ-REEL
- Part No.:
- AD7782BRUZ-REEL
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 16-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
AD7782BRUZ-REEL.pdf
- Description:
- IC ADC 24BIT SIGMA-DELTA 16TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,557
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Product details
Overview
AD7782BRUZ-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 scales and industrial process control systems.
For engineers reviewing the AD7782BRUZ-REEL datasheet, AD7782BRUZ-REEL pinout, AD7782BRUZ-REEL application, or AD7782BRUZ-REEL equivalent, key selection considerations include its read-only SPI-compatible interface, rail-to-rail buffered inputs with PGA, 16.5-bit p-p resolution at ±160 mV range, 18.5-bit p-p resolution at ±2.56 V range, and TSSOP-16 package compatibility with low-power 3 V/5 V operation.
Technical Context
The AD7782BRUZ-REEL implements a sigma-delta modulator with on-chip PLL locked to a 32.768 kHz crystal, generating a stable internal 4.194 MHz clock. Its digital filter places notches at both 50 Hz and 60 Hz, achieving ≥60 dB normal-mode rejection without software configuration.
Channel selection (AIN1/AIN2) and input range (±160 mV / ±2.56 V) are controlled by dedicated logic pins (CH1/CH2 and RANGE), eliminating register programming. The device operates in master or slave mode via the MODE pin, with Schmitt-triggered SCLK supporting opto-isolated interfaces.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 24-bit no missing codes; 18.5-bit p-p at ±2.56 V range ensures stable digitization of full-scale industrial sensor outputs. |
| Update Rate | Fixed 19.79 Hz - enables synchronized sampling for anti-aliasing and inherent 50/60 Hz line-noise rejection. |
| Input Ranges | Pin-selectable ±160 mV (RANGE = 0) or ±2.56 V (RANGE = 1) - matches common bridge sensor excitation levels and RTD signal conditioning. |
| Power Consumption | 1.3 mA typical at 3 V (3.9 mW) - supports battery-powered portable instrumentation without thermal drift compromise. |
| Common-Mode Rejection | ≥105 dB at DC (±160 mV range) - suppresses ground-loop noise in multi-sensor industrial field wiring. |
| INL Error | ±10 ppm of FSR max - maintains accuracy across temperature in closed-loop control feedback paths. |
| Offset Drift | ±10 nV/°C typ - minimizes calibration frequency in temperature-sensitive pressure transducer applications. |
Pinout & Package
AD7782BRUZ-REEL is housed in a 16-lead TSSOP (RU-16) package with 0.65 mm pitch, optimized for compact PCB layouts and automated assembly. Thermal impedance θJA = 97.9°C/W supports operation up to +85°C ambient without heatsinking.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| AIN1(+), AIN1(–) | Differential analog input channel 1 | Accepts ±160 mV or ±2.56 V signals; high-impedance buffered input tolerates >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 performance and range options as AIN1. |
| REFIN(+), REFIN(–) | Differential reference input | Accepts 1 V to VDD nominal 2.5 V reference; unbuffered design requires low-impedance source (e.g., AD780) to avoid gain error. |
| CH1/CH2 | Channel select logic input | Logic low selects AIN1; logic high selects AIN2 - enables hardware-multiplexed dual-sensor monitoring without MCU intervention. |
| RANGE | Input range configuration pin | Logic low sets ±160 mV full-scale (gain = 16); logic high sets ±2.56 V full-scale (gain = 1) - eliminates firmware register writes. |
| MODE | Master/slave interface mode select | Logic low configures SCLK output (master); logic high configures SCLK input (slave) - supports direct microcontroller or isolated bus connection. |
| DOUT/RDY | Serial data output / conversion ready indicator | Functions as RDY interrupt when low; outputs 24-bit offset binary code on falling SCLK edge - simplifies timing-critical polling or IRQ-driven reads. |
| CS | Chip select / power control | Active-low enable: initiates conversion and PLL lock when low; forces standby (9 µA) and three-states DOUT/SCLK when high. |
Key Features
| Feature | Design Value |
|---|---|
| Pin-configured operation | No registers to program - channel, range, and interface mode set by hardwired logic pins, reducing firmware complexity and boot-time initialization. |
| Simultaneous 50 Hz/60 Hz rejection | Notch filters placed at both frequencies via fixed digital filter architecture - eliminates need for external notch filters or software-based digital filtering. |
| Rail-to-rail input buffer + PGA | Supports sensor outputs referenced to GND or VDD; ±100 mV absolute input voltage margin prevents clipping in noisy industrial environments. |
| Low-power 3 V/5 V operation | 1.3 mA @ 3 V (3.9 mW) and 9 µA power-down current - extends battery life in handheld test equipment and remote sensor nodes. |
| Schmitt-triggered SCLK | Enables robust communication over long traces or opto-isolators without external signal conditioning - critical for EMI-prone factory floor deployments. |
Applications
| Weigh Scales | Industrial Process Control |
|---|---|
|
Use Scenario: High-resolution weight measurement in platform scales and hopper load cells using full-bridge strain gage sensors. IC Role / Device Role / Timing Role: ADC front end converting mV-level differential bridge output into 24-bit digital values at 19.79 Hz with built-in line-frequency rejection. Use Value: 18.5-bit p-p resolution at ±2.56 V range resolves sub-gram changes in 100 kg capacity systems without external amplification or filtering. |
Use Scenario: Closed-loop monitoring of pressure, flow, and level transmitters in chemical plant PLC I/O modules. IC Role / Device Role / Timing Role: Dual-channel ratiometric ADC acquiring sensor and reference signals simultaneously to reject supply and excitation drift. Use Value: ±10 ppm INL and ±10 nV/°C offset drift ensure <0.01% FS accuracy over –40°C to +85°C without periodic recalibration. |
| Temperature Measurement | Portable Instrumentation |
|
Use Scenario: Precision RTD (Pt100/Pt1000) readout in handheld calibrators and environmental data loggers. IC Role / Device Role / Timing Role: Buffered 24-bit ADC with programmable gain accepting low-level RTD voltage drops across precision current sources. Use Value: 16.5-bit p-p resolution at ±160 mV range resolves 0.01°C increments in Class A Pt100 measurements with 1 mA excitation. |
Use Scenario: Battery-powered multimeters and portable oscilloscopes requiring low-noise, low-power analog acquisition. IC Role / Device Role / Timing Role: Standalone ADC subsystem with crystal-locked timing, eliminating need for external clock generation or calibration routines. Use Value: 3.9 mW power at 3 V enables >100 hours of continuous operation on two AA cells while maintaining 24-bit integrity. |
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 |
|---|---|---|---|
| AD7783BRUZ-REEL | Single-channel version with integrated 200 µA current sources; identical pinout and timing but lacks second analog input. | Suitable only for single-sensor systems (e.g., single RTD or thermocouple) where excitation sourcing is required. | Select AD7783BRUZ-REEL when current-source excitation and single-channel operation reduce BOM count and layout area. |
| ADS124S08IPWR | 24-bit delta-sigma ADC with 4-channel mux, programmable registers, and internal 2.5 V reference; 20-pin TSSOP package. | Requires SPI register configuration and supports higher update rates (up to 4 kSPS), but lacks simultaneous 50/60 Hz rejection. | Choose ADS124S08IPWR for multi-sensor systems needing flexible gain, offset, and data rate settings - not for fixed-rate, line-rejection–critical use cases. |
Compared with AD7782BRUZ-REEL, AD7783BRUZ-REEL reduces channel count but adds excitation capability, while ADS124S08IPWR increases channel density and configurability at the cost of deterministic line-noise rejection and pin-compatible replacement.
Availability
AD7782BRUZ-REEL is available at Aetrix Electronics and suitable for weigh scales, industrial process controllers, and portable instrumentation requiring stable component supply, RoHS-compliant packaging, and guaranteed long-term availability.
Supply support for AD7782BRUZ-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, serving industrial, automotive, communications, and healthcare markets since 1965.
The AD778x family-including AD7782BRUZ-REEL-is engineered for ultra-precision, low-power, low-frequency measurement in sensor front ends, emphasizing simplicity, noise immunity, and deterministic line-rejection without firmware overhead.
FAQ
What is the function of the RANGE pin on the AD7782BRUZ-REEL?
The RANGE pin on the AD7782BRUZ-REEL is a logic input that selects the full-scale input voltage range: logic low (0) configures ±160 mV for high-gain sensor signals like strain gages, while logic high (1) configures ±2.56 V for lower-gain applications such as thermocouple amplifiers. This hardware-based selection eliminates register writes and ensures deterministic behavior at power-up.
Does the AD7782BRUZ-REEL require an external crystal oscillator?
Yes, the AD7782BRUZ-REEL requires a 32.768 kHz watch crystal connected between XTAL1 and XTAL2 pins. The on-chip oscillator and PLL generate the precise internal clock needed for its 19.79 Hz update rate and simultaneous 50 Hz/60 Hz rejection. No external clock source or oscillator IC is needed - only the crystal and recommended load capacitors per Analog Devices' layout guidelines.
Can the AD7782BRUZ-REEL operate from a 3.3 V supply?
Yes, the AD7782BRUZ-REEL is fully specified for 3 V operation (2.7 V to 3.6 V range). At VDD = 3 V, it draws 1.3 mA typical in normal mode (3.9 mW) and 6 µA in power-down mode. All electrical specifications - including INL, offset drift, and CMRR - are guaranteed across this range, making it suitable for modern 3.3 V industrial and portable systems.
How does the AD7782BRUZ-REEL achieve simultaneous 50 Hz and 60 Hz rejection?
The AD7782BRUZ-REEL achieves simultaneous 50 Hz and 60 Hz rejection through a fixed digital filter architecture with notches precisely placed at both frequencies. This is enabled by its crystal-locked 19.79 Hz output rate - a submultiple of both 50 Hz and 60 Hz - ensuring inherent rejection without software configuration, external components, or trade-offs in resolution or update rate.
Is the AD7782BRUZ-REEL pin-compatible with other devices in the AD778x family?
The AD7782BRUZ-REEL shares the same 16-lead TSSOP (RU-16) package and pinout with AD7782BRUZ, AD7782BRU-REEL, and AD7782BRUZ-REEL7. However, it is not pin-compatible with AD7783BRUZ-REEL: although physically identical, AD7783 repurposes AIN2(+) and AIN2(–) as current-source outputs, making direct substitution electrically invalid without circuit redesign.
AD7782BRUZ-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:
- Active
- 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:
- -
AD7782BRUZ-REEL FAQ
1.How can I place an order for AD7782BRUZ-REEL through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7782BRUZ-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 AD7782BRUZ-REEL reliable?
The price and inventory of AD7782BRUZ-REEL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7782BRUZ-REEL is usually 5 days.
3.What payment methods are accepted for AD7782BRUZ-REEL?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7782BRUZ-REEL transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7782BRUZ-REEL?
AD7782BRUZ-REEL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7782BRUZ-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 AD7782BRUZ-REEL?
For technical support, including AD7782BRUZ-REEL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7782BRUZ-REEL requirements.
6.How does Aetrix verify that AD7782BRUZ-REEL is sourced from the original manufacturer or authorized distributors?
All AD7782BRUZ-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 AD7782BRUZ-REEL meets industry standards.
7.What is the process for return or replacement of AD7782BRUZ-REEL?
All AD7782BRUZ-REEL units undergo pre-shipment inspection (PSI). If there is an issue with AD7782BRUZ-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 AD7782BRUZ-REEL part is unused and in its original packaging.
Return procedure for AD7782BRUZ-REEL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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