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Analog Devices Inc. AD7783BRU-REEL7
- Part No.:
- AD7783BRU-REEL7
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 16-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
AD7783BRU-REEL7.pdf
- Description:
- IC ADC 24BIT SIGMA-DELTA 16TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,071
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Product details
Overview
AD7783BRU-REEL7 from Analog Devices is a read-only, pin-configured 24-bit sigma-delta ADC with integrated 200 µA excitation current sources, rail-to-rail input buffer, and programmable gain amplifier (PGA). It delivers simultaneous 50 Hz/60 Hz rejection at a fixed 19.79 Hz update rate, ±160 mV or ±2.56 V input ranges, and 18.5-bit p-p resolution in the ±2.56 V range-designed for precision bridge and RTD sensor measurement in industrial weigh scales and temperature transmitters.
For engineers reviewing the AD7783BRU-REEL7 datasheet, AD7783BRU-REEL7 pinout, AD7783BRU-REEL7 application, or AD7783BRU-REEL7 equivalent, key selection criteria include its no-register interface, dual excitation current routing via IPIN, fixed-output-rate architecture for deterministic timing, and TSSOP-16 package compatibility with low-noise analog front-end layouts.
Technical Context
The AD7783BRU-REEL7 implements a single-channel, fully differential 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.
Input signal conditioning is hardware-defined: RANGE pin selects PGA gain (1 or 16), setting full-scale ranges of ±160 mV or ±2.56 V; IPIN pin routes either of two matched 200 µA current sources to IOUT1/IOUT2; MODE pin configures master (SCLK output) or slave (SCLK input) serial operation-eliminating register writes and firmware dependencies.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 24-bit no missing codes; 18.5-bit p-p (±2.56 V range), enabling high-fidelity strain gage digitization without code flicker |
| Update Rate | Fixed 19.79 Hz output rate-deterministic timing for synchronized multi-sensor sampling and PLC cycle alignment |
| Input Ranges | Pin-selectable ±160 mV (RANGE = 0) or ±2.56 V (RANGE = 1); supports direct connection to mV-output load cells and V-output RTDs |
| Excitation Sources | Two matched 200 µA current sources with ±2.5% initial matching; routed via IPIN to IOUT1/IOUT2 for 4-wire bridge biasing |
| Power Supply | Single 3 V or 5 V operation; 1.3 mA typical current at 3 V-suitable for battery-powered portable instrumentation |
| Common-Mode Rejection | ≥105 dB at DC (±160 mV range); rejects ground-loop noise in industrial sensor wiring without external amplification |
| Normal-Mode Rejection | ≥60 dB @ 50 Hz, ≥94 dB @ 60 Hz-meets IEC 61000-4-8 immunity requirements for process control environments |
Pinout & Package
AD7783BRU-REEL7 is housed in a 16-lead TSSOP (RU-16) package with 0.65 mm pitch, optimized for compact PCB layout and thermal performance (θJA = 97.9°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| AIN(+), AIN(–) | Fully differential analog input pair | Accepts bipolar signals referenced to each other; supports up to GND + 100 mV to VDD – 100 mV common-mode range |
| REFIN(+), REFIN(–) | Differential reference input | Unbuffered 2.5 V nominal reference; functional from 1 V to VDD-enables ratiometric operation with excitation sources |
| IOUT1, IOUT2 | Current source outputs | Each delivers 200 µA; routing controlled by IPIN-supports 4-wire RTD or dual-bridge configurations |
| RANGE | PGA gain select input | Logic level sets ±160 mV (low) or ±2.56 V (high) full-scale range-no firmware overhead |
| IPIN | Current source routing control | GND → IEXC1→IOUT1 / IEXC2→IOUT2; VDD → IEXC1→IOUT2 / IEXC2→IOUT1-hardware-switched excitation polarity |
| MODE | Serial interface mode select | Low = master (SCLK output); high = slave (SCLK input)-compatible with SPI/QSPI/MICROWIRE controllers |
| DOUT/RDY | Data output / conversion ready indicator | Active-low RDY pulse signals data availability; also outputs 24-bit offset binary word-simplifies interrupt-driven reads |
| CS | Chip select / power control | Active-low enables conversion and PLL lock; high places device in standby (9 µA), preserving system power budget |
Key Features
| Feature | Design Value |
|---|---|
| Read-only digital interface | No registers to configure-reduces firmware complexity and eliminates initialization errors in safety-critical systems |
| Simultaneous 50/60 Hz rejection | Hardware-filtered notch response ensures compliance with EN 61326-1 for industrial EMC without calibration or post-processing |
| Integrated 200 µA current sources | Matched ±2.5% at 25°C; drift ≤200 ppm/°C-enables stable 4-wire RTD measurements over –40°C to +85°C |
| Rail-to-rail input buffer | Supports high-impedance sensor sources (e.g., thermistors, piezoresistive elements) without external op-amps or gain stages |
| 32.768 kHz crystal oscillator | On-chip PLL generates precise internal clock-eliminates need for external clock generator and reduces BOM count |
Applications
| Industrial Weigh Scales | Temperature Transmitters |
|---|---|
Use Scenario: High-accuracy weight measurement in platform scales and hopper load cells using full-bridge strain gages. IC Role / Device Role / Timing Role: ADC front end with integrated excitation and PGA-digitizes mV-level bridge output directly with 18.5-bit p-p resolution. Use Value: Eliminates external current sources and instrumentation amplifiers, reducing component count and board area while maintaining NTEP Class III certification margins. | Use Scenario: 4-wire RTD sensing in field-mounted temperature transmitters for HVAC and process control. IC Role / Device Role / Timing Role: Precision ADC with dual matched current sources-biases RTD and measures voltage drop with ratiometric rejection of lead resistance. Use Value: IPIN-controlled current routing enables automatic excitation reversal for lead resistance cancellation without MCU intervention. |
| Pressure Transducers | Portable Gas Analyzers |
Use Scenario: Low-power differential pressure sensing in medical ventilators and environmental monitors using silicon piezoresistive sensors. IC Role / Device Role / Timing Role: Signal conditioner and ADC-accepts ±160 mV bridge output, provides 50/60 Hz line rejection, and operates from 3 V supply. Use Value: Fixed 19.79 Hz update rate synchronizes with mains frequency for optimal noise rejection in AC-coupled environments. | Use Scenario: Battery-operated handheld gas detection units requiring long runtime and high-resolution electrochemical sensor readout. IC Role / Device Role / Timing Role: Low-power analog front end-consumes only 1.3 mA at 3 V while delivering 16.5-bit p-p resolution in ±160 mV range. Use Value: Power-down mode draws just 9 µA, extending battery life between calibrations without sacrificing measurement repeatability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar sigma-delta ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD7782BRU-REEL7 | No integrated excitation current sources; dual differential input channels instead of single channel with current sources | Suitable for multi-sensor systems without resistive excitation needs (e.g., thermocouple arrays) | Select when measuring multiple low-level signals without bridge/RTD biasing requirements |
| ADS124S08IPW | Programmable registers, 4-channel mux, 2.5 V internal reference, higher 4 kSPS max rate-but no integrated current sources | Better suited for flexible multi-sensor data loggers requiring software-configurable gain and data rates | Select when system firmware can manage register configuration and higher throughput is needed over deterministic low-noise filtering |
Compared with AD7783BRU-REEL7, AD7782BRU-REEL7 offers channel count at the cost of excitation capability, while ADS124S08IPW trades pin-configured simplicity for register-based flexibility-making AD7783BRU-REEL7 optimal for fixed-function, low-maintenance sensor interfaces where hardware-defined timing and excitation are critical.
Availability
AD7783BRU-REEL7 is available at Aetrix Electronics and suitable for industrial weigh scales, temperature transmitters, pressure transducers, and portable instrumentation requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for AD7783BRU-REEL7 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.
The AD778x family-including AD7783BRU-REEL7-is engineered for low-frequency, high-resolution sensor measurement, emphasizing hardware-configured simplicity, integrated excitation, and robust noise rejection in harsh electromagnetic environments.
FAQ
What is the primary function of the AD7783BRU-REEL7 in a sensor measurement system?
The AD7783BRU-REEL7 serves as a complete analog front end for precision low-frequency sensor measurement. It integrates a 24-bit sigma-delta ADC, programmable gain amplifier, rail-to-rail input buffer, and two matched 200 µA excitation current sources-all in a pin-configured, read-only architecture. In systems like weigh scales or RTD transmitters, the AD7783BRU-REEL7 directly digitizes bridge or resistive sensor outputs with simultaneous 50 Hz/60 Hz rejection, eliminating the need for external amplifiers, current sources, or digital filtering firmware.
How does the RANGE pin affect the AD7783BRU-REEL7's input voltage handling?
The RANGE pin on the AD7783BRU-REEL7 selects the full-scale input range of the internal PGA: logic low (RANGE = 0) configures ±160 mV, ideal for millivolt-output strain gages; logic high (RANGE = 1) configures ±2.56 V, suitable for higher-level sensor outputs or direct connection to voltage-mode transducers. This hardware selection determines the PGA gain (16 or 1) and sets the absolute input limits to GND + 100 mV to VDD – 100 mV-ensuring optimal dynamic range without software register writes.
Can the AD7783BRU-REEL7 operate in both master and slave serial modes-and what distinguishes them?
Yes, the AD7783BRU-REEL7 supports both modes via the MODE pin: MODE = 0 enables master mode (SCLK output), where the device generates its own serial clock synchronized to the 32.768 kHz crystal; MODE = 1 enables slave mode (SCLK input), where an external controller drives the clock. In master mode, DOUT/RDY pulses low before SCLK starts, simplifying timing for resource-constrained microcontrollers; in slave mode, DOUT/RDY acts as a data-ready interrupt, allowing flexible batched reads-both modes use the same 24-bit offset binary protocol compatible with SPI, QSPI, and MICROWIRE.
What is the role of the IPIN pin on the AD7783BRU-REEL7, and how does it impact RTD measurements?
The IPIN pin on the AD7783BRU-REEL7 controls routing of the two on-chip 200 µA current sources: when IPIN = GND, IEXC1 drives IOUT1 and IEXC2 drives IOUT2; when IPIN = VDD, the routing swaps. In 4-wire RTD measurements, this allows hardware-controlled excitation polarity reversal-enabling lead resistance cancellation without MCU GPIO toggling or external switches. This feature improves measurement accuracy and stability in temperature transmitters where long sensor leads introduce significant parasitic resistance.
Does the AD7783BRU-REEL7 require an external crystal, and why is 32.768 kHz specified?
Yes, the AD7783BRU-REEL7 requires an external 32.768 kHz crystal connected between XTAL1 and XTAL2. This frequency is used by the on-chip oscillator and PLL to generate the precise internal 4.194304 MHz clock needed for the sigma-delta modulator. The 32.768 kHz value ensures exact integer multiplication (×128) to achieve the fixed 19.79 Hz output update rate-which in turn guarantees deterministic 50 Hz and 60 Hz notch placement in the digital filter response. Using any other crystal frequency would break the harmonic relationship and degrade line-frequency rejection performance.
AD7783BRU-REEL7 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:
- 1
- 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:
- -
AD7783BRU-REEL7 FAQ
1.How can I place an order for AD7783BRU-REEL7 through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7783BRU-REEL7 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 AD7783BRU-REEL7 reliable?
The price and inventory of AD7783BRU-REEL7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7783BRU-REEL7 is usually 5 days.
3.What payment methods are accepted for AD7783BRU-REEL7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7783BRU-REEL7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7783BRU-REEL7?
AD7783BRU-REEL7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7783BRU-REEL7 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 AD7783BRU-REEL7?
For technical support, including AD7783BRU-REEL7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7783BRU-REEL7 requirements.
6.How does Aetrix verify that AD7783BRU-REEL7 is sourced from the original manufacturer or authorized distributors?
All AD7783BRU-REEL7 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 AD7783BRU-REEL7 meets industry standards.
7.What is the process for return or replacement of AD7783BRU-REEL7?
All AD7783BRU-REEL7 units undergo pre-shipment inspection (PSI). If there is an issue with AD7783BRU-REEL7, 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 AD7783BRU-REEL7 part is unused and in its original packaging.
Return procedure for AD7783BRU-REEL7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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