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Analog Devices Inc. AD7782BRUZ-REEL7
- Part No.:
- AD7782BRUZ-REEL7
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 16-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
AD7782BRUZ-REEL7.pdf
- Description:
- IC ADC 24BIT SIGMA-DELTA 16TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:875
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Product details
Overview
AD7782BRUZ-REEL7 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-ideal for weigh scales and industrial process control systems.
For engineers reviewing the AD7782BRUZ-REEL7 datasheet, AD7782BRUZ-REEL7 pinout, AD7782BRUZ-REEL7 application, or AD7782BRUZ-REEL7 equivalent, this page delivers verified technical context, real-world design meaning for key specs, validated pin functions, confirmed alternatives, and supply-chain support for production deployment.
Technical Context
The AD7782BRUZ-REEL7 implements a sigma-delta modulator with on-chip programmable gain amplifier (PGA), rail-to-rail input buffer, and digital filter optimized for high-resolution DC and low-frequency AC measurements. Its fixed 19.79 Hz update rate derives from an internal PLL locked to a 32.768 kHz crystal, enabling deterministic timing and guaranteed 50/60 Hz notch rejection without software configuration.
All digital interface behavior-including master/slave mode selection via MODE pin, channel selection via CH1/CH2, input range via RANGE, and data transfer via DOUT/RDY and SCLK-is determined solely by external pin states; no internal registers exist. The device operates from single 3 V or 5 V supply and achieves 24-bit no-missing-codes performance with 18.5-bit p-p resolution at ±2.56 V range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 24-bit no missing codes; guarantees monotonicity across full scale for calibration-critical applications. |
| Update Rate | Fixed 19.79 Hz; eliminates firmware timing dependencies and ensures consistent latency in closed-loop systems. |
| Input Ranges | Pin-selectable ±160 mV (16.5-bit p-p) or ±2.56 V (18.5-bit p-p); enables direct connection to mV-level sensors (e.g., load cells) or higher-voltage transducers without external signal conditioning. |
| Power Consumption | 1.3 mA @ 3 V normal mode; supports battery-powered portable instrumentation with predictable current draw. |
| Common-Mode Rejection | ≥105 dB @ DC (±160 mV range); suppresses ground loop noise and EMI in industrial environments with long sensor cables. |
| Normal-Mode Rejection | 60 dB @ 50 Hz, 94 dB @ 60 Hz; rejects mains-borne interference without external filtering components. |
| Reference Input | 2.5 V nominal differential (REFIN+ – REFIN−); accepts 1 V to VDD range, supporting ratiometric operation with transducer excitation sources. |
Pinout & Package
AD7782BRUZ-REEL7 is housed in a 16-lead TSSOP (RU-16) package with 0.65 mm pitch, optimized for compact PCB layouts and automated assembly. Thermal resistance θJA = 97.9°C/W supports operation up to +85°C ambient without forced cooling.
| 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 RTDs or strain gauges. |
| AIN2(+), AIN2(–) | Differential analog input channel 2 | Independent second channel; selected via CH1/CH2 pin; identical electrical characteristics to AIN1 pair. |
| CH1/CH2 | Channel select logic input | Logic low selects AIN1; logic high selects AIN2-enables hardware-multiplexed dual-sensor monitoring without microcontroller intervention. |
| RANGE | Input range configuration input | Logic low sets ±160 mV PGA gain (×16); logic high sets ±2.56 V PGA gain (×1); defines full-scale voltage before ADC conversion. |
| REFIN(+), REFIN(–) | Differential reference input | Unbuffered 2.5 V nominal reference; common-mode range GND to VDD; requires low-impedance source (e.g., AD780) for <10 ppm gain error. |
| MODE | Interface mode select | Logic low enables master mode (SCLK output); logic high enables slave mode (SCLK input); determines clock sourcing in system-level integration. |
| CS | Chip select / power control | Active-low signal that initiates conversion when low; places device in standby (9 µA) when high-critical for power-gated sensor nodes. |
| DOUT/RDY | Data output / ready indicator | Outputs 24-bit offset binary code on falling SCLK edge; asserts low to signal valid data-serves as hardware interrupt to host processor. |
| SCLK | Serial clock | In slave mode: Schmitt-triggered input accepting opto-isolated clocks; in master mode: 32.768 kHz-derived output synchronized to conversion completion. |
| XTAL1, XTAL2 | Crystal oscillator terminals | Drive 32.768 kHz watch crystal; internal PLL generates stable 4.194 MHz core clock-eliminates need for external clock generator. |
Key Features
| Feature | Design Value |
|---|---|
| Pin-configured operation | No firmware programming required-channel, range, and interface mode set by hardwired logic levels, reducing BOM count and boot-time complexity. |
| Simultaneous 50 Hz/60 Hz rejection | Digital filter notches placed at both frequencies deliver ≥60 dB attenuation without external notch filters or DSP processing. |
| Rail-to-rail input buffer | Supports analog input common-mode voltages from GND + 100 mV to VDD – 100 mV-enables direct interfacing with unbuffered bridge sensors. |
| Offset binary coding | Zero differential input yields 0x800000 (24-bit); simplifies arithmetic in microcontrollers lacking signed integer support. |
| Low-power standby mode | 9 µA typical current draw in CS-high state-extends battery life in intermittent-read sensor applications such as environmental monitors. |
Applications
| Industrial Weigh Scales | Temperature Monitoring Systems |
|---|---|
|
Use Scenario: High-accuracy weight measurement in platform scales and hopper load cells using millivolt-output strain gauge bridges. IC Role / Device Role / Timing Role: Primary ADC front end converting differential bridge output to 24-bit digital values at 19.79 Hz with built-in 50/60 Hz line rejection. Use Value: Eliminates need for external PGA, reference, and digital filtering-reducing component count and PCB area while maintaining 18.5-bit effective resolution. |
Use Scenario: Precision RTD-based temperature sensing in HVAC controllers and industrial ovens with 0.1°C accuracy requirements. IC Role / Device Role / Timing Role: Dual-channel ADC acquiring both RTD voltage and reference voltage simultaneously for ratiometric correction. Use Value: Pin-selectable ±160 mV range matches typical 4-wire RTD excitation outputs; 24-bit no-missing-codes ensures linear calibration over full temperature span. |
| Pressure Transducer Interfaces | Portable Battery-Powered Test Equipment |
|
Use Scenario: Signal conditioning for piezoresistive pressure sensors in medical devices and process instrumentation. IC Role / Device Role / Timing Role: ADC with integrated PGA and buffer accepting high-impedance sensor outputs directly, rejecting common-mode noise from long cable runs. Use Value: ≥105 dB common-mode rejection at DC enables reliable operation in electrically noisy factory floors without shielded cabling. |
Use Scenario: Handheld multimeters and data loggers requiring ultra-low power consumption and high DC accuracy. IC Role / Device Role / Timing Role: Low-power ADC operating from 3 V supply with 1.3 mA active current and 9 µA standby-enabling >100-hour battery life. Use Value: Fixed update rate and pin configuration eliminate firmware overhead, freeing MCU resources for display and communication tasks. |
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 |
|---|---|---|---|
| AD7783BRUZ-REEL7 | Single-channel variant with two integrated 200 µA current sources; identical pinout and timing but lacks second analog input. | Optimized for 3-/4-wire RTD measurement where excitation current sourcing is required; not suitable for dual-sensor monitoring. | Select AD7783BRUZ-REEL7 only when current-source excitation is needed and dual-channel acquisition is unnecessary. |
| ADS124S08IPW | 24-bit delta-sigma ADC with programmable registers, SPI interface, and integrated PGA; supports variable data rates (10–4 kSPS) and multiple input configurations. | Requires firmware initialization and register writes; better suited for systems needing flexible sampling or multi-sensor scanning. | Choose ADS124S08IPW when design flexibility, higher throughput, or advanced diagnostics outweigh simplicity and zero-config operation. |
Compared with AD7782BRUZ-REEL7, AD7783BRUZ-REEL7 trades one analog channel for on-chip excitation current sources-ideal for RTD-only systems-while ADS124S08IPW adds software configurability at the cost of increased firmware complexity and reduced determinism in timing-critical applications.
Availability
AD7782BRUZ-REEL7 is available at Aetrix Electronics and suitable for industrial process control, weigh scale manufacturing, and portable instrumentation requiring stable component supply, RoHS-compliant packaging, and long-term production continuity.
Supply support for AD7782BRUZ-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 since 1965.
The AD778x family-including AD7782BRUZ-REEL7-is engineered specifically for high-accuracy, low-power, low-frequency sensor signal acquisition in harsh industrial environments, emphasizing simplicity, noise immunity, and out-of-the-box reliability.
FAQ
What is the primary function of the AD7782BRUZ-REEL7 in a sensor measurement system?
The AD7782BRUZ-REEL7 serves as a complete analog front-end ADC, converting low-frequency differential sensor signals (e.g., from strain gauges or RTDs) into 24-bit digital values. Its pin-configured architecture, built-in PGA, and simultaneous 50/60 Hz rejection eliminate external signal conditioning components-making AD7782BRUZ-REEL7 ideal for high-accuracy, low-noise industrial sensing without firmware overhead.
Does the AD7782BRUZ-REEL7 require programming registers during operation?
No, the AD7782BRUZ-REEL7 has no programmable registers. All configuration-including input channel (CH1/CH2), input range (RANGE), and interface mode (MODE)-is set by external logic levels at power-up. This read-only interface ensures deterministic behavior and eliminates startup delays or register corruption risks, distinguishing AD7782BRUZ-REEL7 from register-based ADCs.
What crystal frequency is required for proper operation of the AD7782BRUZ-REEL7?
The AD7782BRUZ-REEL7 requires a 32.768 kHz watch crystal connected between XTAL1 and XTAL2 pins. This frequency drives an internal PLL that generates the precise 4.194304 MHz clock needed for the sigma-delta modulator. Using any other crystal frequency will prevent correct operation-AD7782BRUZ-REEL7 does not support alternative clock sources or internal RC oscillators.
How does the AD7782BRUZ-REEL7 achieve simultaneous 50 Hz and 60 Hz rejection?
The AD7782BRUZ-REEL7 uses a fixed digital filter with notches precisely placed at both 50 Hz and 60 Hz, enabled by its deterministic 19.79 Hz update rate derived from the 32.768 kHz crystal and internal PLL. This hardware-based filtering delivers ≥60 dB rejection at 50 Hz and ≥94 dB at 60 Hz without software intervention-ensuring AD7782BRUZ-REEL7 maintains accuracy in globally deployed equipment subject to either mains frequency.
Can the AD7782BRUZ-REEL7 operate from a 3.3 V supply?
Yes, the AD7782BRUZ-REEL7 is specified for single 3 V operation (2.7 V to 3.6 V range). At 3 V supply, it draws 1.3 mA typical in normal mode and 6 µA typical in power-down mode. Logic thresholds scale accordingly: VINH ≥ 2.0 V and VINL ≤ 0.4 V, ensuring compatibility with standard 3.3 V microcontrollers-confirming AD7782BRUZ-REEL7 supports modern low-voltage industrial designs.
AD7782BRUZ-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:
- 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-REEL7 FAQ
1.How can I place an order for AD7782BRUZ-REEL7 through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7782BRUZ-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 AD7782BRUZ-REEL7 reliable?
The price and inventory of AD7782BRUZ-REEL7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7782BRUZ-REEL7 is usually 5 days.
3.What payment methods are accepted for AD7782BRUZ-REEL7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7782BRUZ-REEL7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7782BRUZ-REEL7?
AD7782BRUZ-REEL7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7782BRUZ-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 AD7782BRUZ-REEL7?
For technical support, including AD7782BRUZ-REEL7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7782BRUZ-REEL7 requirements.
6.How does Aetrix verify that AD7782BRUZ-REEL7 is sourced from the original manufacturer or authorized distributors?
All AD7782BRUZ-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 AD7782BRUZ-REEL7 meets industry standards.
7.What is the process for return or replacement of AD7782BRUZ-REEL7?
All AD7782BRUZ-REEL7 units undergo pre-shipment inspection (PSI). If there is an issue with AD7782BRUZ-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 AD7782BRUZ-REEL7 part is unused and in its original packaging.
Return procedure for AD7782BRUZ-REEL7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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