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Analog Devices Inc. AD7780BRUZ-REEL
- Part No.:
- AD7780BRUZ-REEL
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 16-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
AD7780BRUZ-REEL.pdf
- Description:
- IC ADC 24BIT SIGMA-DELTA 16TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,513
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Product details
Overview
AD7780BRUZ-REEL from Analog Devices is a 24-bit, ultralow power sigma-delta ADC optimized for bridge sensor front ends, featuring pin-programmable gain (1 or 128), dual update rates (10 Hz / 16.7 Hz), simultaneous 50 Hz/60 Hz rejection, and integrated bridge power-down switch. It delivers 17.1–19.4 bits peak-to-peak resolution with RMS noise as low as 44 nV (gain = 128, 10 Hz) and operates from 2.7 V to 5.25 V across −40°C to +105°C - enabling high-accuracy weigh scale and pressure measurement in battery-powered industrial instrumentation.
For engineers reviewing the AD7780BRUZ-REEL datasheet, AD7780BRUZ-REEL pinout, AD7780BRUZ-REEL application, or AD7780BRUZ-REEL equivalent, key selection considerations include its pin-controlled filter/gain configuration, 2-wire read-only serial interface with status bits, internal clock oscillator, independent DVDD/AVDD supplies, and SOIC-14 package compatibility - all critical for low-power, high-precision sensor signal conditioning where layout simplicity and supply flexibility are essential.
Technical Context
The AD7780BRUZ-REEL implements a 24-bit sigma-delta modulator with on-chip programmable gain amplifier (PGA) and digital filter, using dedicated pins (GAIN, FILTER, PDRST) to configure operation without register writes. Its dual-filter architecture provides either fast settling (120 ms at 16.7 Hz) or high stop-band attenuation (>−45 dB at 10 Hz), both supporting simultaneous 50/60 Hz rejection.
It integrates an internal 64 kHz ±3% oscillator, bridge power-down switch (RON ≤ 9 Ω, 30 mA rating), and Schmitt-triggered SCLK input. The device uses offset binary coding, supports ratiometric or external reference configurations (0.5 V to AVDD), and features independent analog (AVDD) and digital (DVDD) supplies - enabling mixed-voltage system interfacing while maintaining precision.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 24-bit sigma-delta with no missing codes; 17.1–19.4 bits peak-to-peak resolution depending on gain and update rate. |
| Update Rate | 10 Hz (300 ms settling) or 16.7 Hz (120 ms settling); selected via FILTER pin - determines trade-off between noise rejection and response speed. |
| PGA Gain | Pin-selectable 1 or 128; sets full-scale differential input range to ±5 V or ±39 mV (with 5 V reference), enabling direct connection to load cells and strain gages. |
| RMS Noise | 44 nV (gain = 128, 10 Hz, 3 V ref); enables sub-microvolt-level signal detection in low-frequency sensor applications. |
| Power Consumption | 115 μA typical (gain = 1, 3 V AVDD); 330 μA typical (gain = 128, 3 V AVDD); drops to 10 μA in power-down mode. |
| Common-Mode Rejection | 110 dB at 50/60 Hz; ensures robust performance against ground noise and EMI in industrial environments. |
| Supply Range | AVDD and DVDD independently support 2.7 V to 5.25 V - allows flexible power domain partitioning in mixed-signal systems. |
Pinout & Package
AD7780BRUZ-REEL is housed in a 14-lead, narrow-body SOIC package (package code BRUZ). Pin 1 is SCLK; pin 2 is DOUT/RDY; pins 3 and 16 are NC; pin 4 is GAIN; pin 5 is AIN(+); pin 6 is AIN(−); pin 7 is REFIN(+); pin 8 is REFIN(−); pin 9 is BPDSW; pin 10 is GND; pin 11 is AVDD; pin 12 is DVDD; pin 13 is PDRST; pin 14 is FILTER.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SCLK | Serial clock input | Schmitt-triggered; controls timing of 32-bit read cycles (24 data + 8 status bits); noncontinuous operation supported. |
| DOUT/RDY | Dual-function output | Indicates conversion completion (low pulse) and outputs serial data; falling edge serves as interrupt to host processor. |
| GAIN | PGA gain select | Low = gain 128 (±39 mV FS); high = gain 1 (±5 V FS); resets modulator/filter on change. |
| FILTER | Digital filter select | Low = 16.7 Hz update (120 ms settling); high = 10 Hz update (300 ms settling); enables mechanical vibration rejection. |
| PDRST | Power-down/reset control | Low = power-down mode (10 μA), opens BPDSW, tristates DOUT/RDY; high = active conversion with ~1 ms clock startup. |
| BPDSW | Bridge power-down switch terminal | Connects to low-side of sensor bridge; closed when PDRST = high; RON ≤ 9 Ω supports ≤30 mA continuous current. |
| AIN(+)/AIN(−) | Differential analog input | High-impedance inputs optimized for resistive sensors; common-mode voltage ≥ 0.5 V required. |
| REFIN(+)/REFIN(−) | Differential reference input | Unbuffered; accepts 0.5 V to AVDD reference; ratiometric operation eliminates excitation source noise. |
Key Features
| Feature | Design Value |
|---|---|
| Pin-programmable gain and filter | Eliminates need for SPI register writes - simplifies firmware, reduces BOM count, and avoids configuration errors in resource-constrained microcontrollers. |
| Simultaneous 50 Hz/60 Hz rejection | Enables accurate measurements in global industrial environments without external notch filters or software compensation. |
| Integrated bridge power-down switch | Reduces system-level quiescent current by disconnecting sensor excitation during idle periods - extends battery life in portable instrumentation. |
| Independent AVDD/DVDD supplies | Allows 3.3 V digital interface interfacing with 5 V analog sensor excitation - avoids level-shifting circuitry and improves noise isolation. |
| Status-bit appended reads | Each 24-bit conversion includes 8 status bits confirming serial transfer validity - enables real-time CRC-like integrity checking without extra protocol overhead. |
Applications
| Weigh Scales | Pressure Measurement |
|---|---|
Use Scenario: High-precision platform scales for commercial or medical use, operating on battery power with <100 ppm accuracy requirement. IC Role / Device Role / Timing Role: Front-end ADC digitizing mV-level output from 4-wire load cell; performs PGA amplification, filtering, and ratiometric conversion synchronized to internal clock. Use Value: 17.6-bit p-p resolution at 10 Hz enables stable 10,000-count display with zero flicker; BPDSW cuts sensor excitation current by >95% during standby. |
Use Scenario: Industrial pressure transmitters for HVAC or process control, requiring EMC robustness and wide temperature operation. IC Role / Device Role / Timing Role: Signal conditioner for piezoresistive pressure sensor; rejects 50/60 Hz line noise and low-frequency mechanical vibrations via selectable filter modes. Use Value: 110 dB CMRR and >−45 dB stop-band attenuation ensure stable readings under motor-driven EMI; −40°C to +105°C rating supports unheated outdoor enclosures. |
| Industrial Process Control | Portable Instrumentation |
Use Scenario: Loop-powered 4–20 mA field transmitter with HART modulation, constrained by <4 mA total loop budget. IC Role / Device Role / Timing Role: Low-power ADC capturing slow-varying process variables (e.g., tank level, flow rate); interfaces to 3.3 V MCU via 2-wire serial link. Use Value: 115 μA typical current (gain = 1) leaves ample margin for sensor excitation and HART IC; independent DVDD allows 3.3 V logic while AVDD runs at 5 V for optimal SNR. |
Use Scenario: Handheld multimeter or portable gas detector requiring 24-hour battery life and sub-μV sensitivity. IC Role / Device Role / Timing Role: Core analog front end converting sensor output to digital; manages power states via PDRST to minimize average current draw. Use Value: Power-down mode draws only 10 μA; internal oscillator removes need for external crystal - reducing PCB area and BOM cost. |
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 |
|---|---|---|---|
| AD7170BRUZ | 24-bit, 10–120 SPS, SPI interface, no pin-programmable gain/filter; requires register writes; higher current (350 μA). | Requires firmware configuration; better suited for multi-channel systems needing flexible channel sequencing. | Select AD7170BRUZ if SPI register control and higher throughput are needed; avoid if pin-strapped simplicity and lowest power are priorities. |
| ADS1232IPW | 24-bit, 10–80 SPS, pin-programmable gain (1/2/64/128), but no simultaneous 50/60 Hz rejection; single-ended reference input. | Lacks differential reference and built-in bridge switch; requires external power MOSFET for sensor power control. | Select ADS1232IPW for lower-cost designs where 50/60 Hz rejection is handled externally; AD7780BRUZ-REEL preferred when integrated rejection and BPDSW are required. |
Compared with AD7780BRUZ-REEL, AD7170BRUZ offers greater configurability at the cost of firmware complexity and higher power, while ADS1232IPW provides broader gain options but lacks the integrated 50/60 Hz rejection and bridge switch - making AD7780BRUZ-REEL uniquely suited for ultra-low-power, self-contained bridge sensor systems demanding minimal external components.
Availability
AD7780BRUZ-REEL is available at Aetrix Electronics and suitable for weigh scales, pressure transmitters, industrial process controllers, and portable instrumentation requiring stable component supply, long-term lifecycle support, and guaranteed traceability.
Supply support for AD7780BRUZ-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, headquartered in Norwood, MA, with design centers and manufacturing facilities worldwide.
The AD7780BRUZ-REEL belongs to Analog Devices' precision sigma-delta ADC product line, engineered specifically for low-power, high-resolution bridge sensor signal conditioning in industrial and instrumentation applications - emphasizing ease of use, minimal external components, and robust noise immunity.
FAQ
What is the maximum allowed analog input voltage range for AD7780BRUZ-REEL?
The AD7780BRUZ-REEL supports a differential input voltage range of ±VREF/gain. With gain = 1 and VREF = 5 V, the range is ±5 V; with gain = 128, it is ±39 mV. Absolute input limits are GND + 100 mV to AVDD − 100 mV (gain = 1) or GND + 450 mV to AVDD − 1.1 V (gain = 128, FILTER = 0). Exceeding these violates absolute maximum ratings and degrades linearity.
Does AD7780BRUZ-REEL require an external crystal or clock source?
No, AD7780BRUZ-REEL includes an internal 64 kHz ±3% oscillator and does not require an external crystal or clock source. This eliminates board space, cost, and layout complexity associated with external timing components - a key advantage for compact, low-power sensor nodes.
How does the AD7780BRUZ-REEL achieve simultaneous 50 Hz and 60 Hz rejection?
The AD7780BRUZ-REEL achieves simultaneous 50 Hz and 60 Hz rejection through its digital filter architecture, which provides >63 dB normal-mode rejection at both frequencies across both 10 Hz and 16.7 Hz update rates. This is inherent to the sigma-delta modulator's notch characteristics and requires no external filtering or software intervention.
Can AD7780BRUZ-REEL operate with different supply voltages on AVDD and DVDD?
Yes, AD7780BRUZ-REEL supports independent AVDD and DVDD supplies, each ranging from 2.7 V to 5.25 V. This allows interfacing a 3.3 V microcontroller (DVDD = 3.3 V) with a 5 V bridge sensor excitation (AVDD = 5 V), eliminating level shifters and improving noise isolation between analog and digital domains.
What happens to the DOUT/RDY pin during power-down mode of AD7780BRUZ-REEL?
When AD7780BRUZ-REEL enters power-down mode (PDRST = low), the DOUT/RDY pin is tristated - meaning it is electrically disconnected from the internal circuitry. This prevents bus contention and allows multiple devices to share the same serial bus without additional isolation components.
AD7780BRUZ-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):
- 16.7
- Number of Inputs:
- 1
- Input Type:
- Differential
- Data Interface:
- SPI
- Configuration:
- PGA-ADC
- Ratio - S/H:ADC:
- -
- Number of A/D Converters:
- 1
- Architecture:
- Sigma-Delta
- Reference Type:
- External
- Voltage - Supply, Analog:
- 2.7V ~ 5.25V
- Voltage - Supply, Digital:
- 2.7V ~ 5.25V
- Features:
- PGA
- Operating Temperature:
- -40°C ~ 105°C
- Supplier Device Package:
- 16-TSSOP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
AD7780BRUZ-REEL FAQ
1.How can I place an order for AD7780BRUZ-REEL through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7780BRUZ-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 AD7780BRUZ-REEL reliable?
The price and inventory of AD7780BRUZ-REEL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7780BRUZ-REEL is usually 5 days.
3.What payment methods are accepted for AD7780BRUZ-REEL?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7780BRUZ-REEL transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7780BRUZ-REEL?
AD7780BRUZ-REEL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7780BRUZ-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 AD7780BRUZ-REEL?
For technical support, including AD7780BRUZ-REEL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7780BRUZ-REEL requirements.
6.How does Aetrix verify that AD7780BRUZ-REEL is sourced from the original manufacturer or authorized distributors?
All AD7780BRUZ-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 AD7780BRUZ-REEL meets industry standards.
7.What is the process for return or replacement of AD7780BRUZ-REEL?
All AD7780BRUZ-REEL units undergo pre-shipment inspection (PSI). If there is an issue with AD7780BRUZ-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 AD7780BRUZ-REEL part is unused and in its original packaging.
Return procedure for AD7780BRUZ-REEL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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