AD7780BRUZ - 24-Bit Sigma-Delta ADC, 330µA | Analog Devices
MPN: AD7780BRUZ ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $8.5 | $8.50 |
| 10 | $7.65 | $76.50 |
| 100 | $6.8 | $680.00 |
| 500 | $6.12 | $3,060.00 |
| 1,000 | $5.44 | $5,440.00 |
AD7780BRUZ Overview
A sigma-delta ADC is an analog-to-digital converter that uses oversampling and noise shaping to achieve high resolution. It is ideal for low-frequency, high-precision measurement applications such as bridge sensors, where the signal bandwidth is narrow but accuracy is paramount. The AD7780 belongs to the family of sigma-delta ADCs, which are a subset of precision analog-to-digital converters used in industrial and instrumentation systems.
Key features include a 24-bit resolution, a maximum output data rate of 16.7 SPS, and a programmable gain of 1, 2, 4, 8, 16, 32, 64, or 128. The device also features a low noise PGA, an on-chip oscillator, and a 3-wire serial interface. The AD7780 operates from a 2.7V to 5.25V supply and consumes only 330 μA, making it ideal for battery-powered applications.
The AD7780 uses a sigma-delta architecture with a digital filter that provides 50 Hz and 60 Hz rejection. The device includes a temperature sensor and a bridge power-down switch, which can be used to conserve power. The AD7780 is specified over the -40°C to +105°C temperature range and is available in a 16-lead TSSOP package.
Typical applications include weigh scales, strain gage transducers, pressure sensors, and portable instrumentation. The low power consumption and high resolution make it suitable for battery-operated devices where power efficiency is critical.
When designing with the AD7780, ensure that the analog and digital supplies are properly decoupled and that the reference input is stable. The device requires an external reference voltage, which should be low-noise to achieve the specified performance.
Drop-in alternatives for AD7780BRUZ — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Variants in this series
Same-series models that are drop-in compatible with AD7780BRUZ (same form factor and footprint) — differing in Resolution, Number of Channels, Sampling Rate, Power-Down Current, Package.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
AD7781BRUZ
✅ Drop-In ⚠️ Specs Unverified✓ In Stock
$5.06 / Unit
View Datasheet →AD7799BRUZ
✅ Drop-In ⚠️ Specs Unverified✓ In Stock
$5.41 / Unit
View Datasheet →AD7798BRUZ
✅ Drop-In ⚠️ Specs Unverified✓ In Stock
$3.85 / Unit
View Datasheet →AD7793BRUZ
✅ Drop-In ⚠️ Specs Unverified✓ In Stock
$5.25 / Unit
View Datasheet →AD7792BRUZ
✅ Drop-In ⚠️ Specs Unverified✓ In Stock
$4.94 / Unit
View Datasheet →AD7780BRUZ-REEL
✅ Drop-In📋 Reference alternative (not in catalog)
AD7780BRUZ Maximum Ratings & Electrical Characteristics
| Resolution | 24 Bit |
| Number of Inputs | 1 |
| Input Type | Differential |
| Data Interface | 3-wire serial |
| Sampling Rate | 16.7 SPS |
| Programmable Gain | 1, 2, 4, 8, 16, 32, 64, 128 |
| Supply Voltage | 2.7 V to 5.25 V |
| Supply Current | 330 µA |
| Architecture | Sigma-Delta |
| Reference Type | External |
| Operating Temperature Range | -40°C to +105°C |
| Package | 16-TSSOP |
| Mounting Type | Surface Mount |
| RoHS Status | Compliant |
| Number of Channels | 1 |
AD7780BRUZ Pin Configuration
| Pin 1 | SCLK — Serial clock input |
| Pin 2 | CS — Chip select (active low) |
| Pin 3 | DIN — Serial data input |
| Pin 4 | DOUT — Serial data output |
| Pin 5 | DVDD — Digital supply voltage |
| Pin 6 | DGND — Digital ground |
| Pin 7 | AVDD — Analog supply voltage |
| Pin 8 | AGND — Analog ground |
| Pin 9 | REFIN(+) — Positive reference input |
| Pin 10 | REFIN(-) — Negative reference input |
| Pin 11 | AIN(+) — Positive analog input |
| Pin 12 | AIN(-) — Negative analog input |
| Pin 13 | PDRST — Power-down reset |
| Pin 14 | GAIN — Gain selection |
| Pin 15 | NC — No connect |
| Pin 16 | NC — No connect |
Typical Applications
AD7780BRUZ is suitable for 6 applications: Weigh Scales, Strain Gage Transducers, Pressure Sensors, Portable Instrumentation, Temperature Measurement, Battery-Powered Systems.
Weigh Scales
The AD7780BRUZ is ideal for weigh scale applications due to its high resolution (24-bit) and low noise PGA. It directly interfaces with bridge sensors, providing accurate weight measurements. The low power consumption (330 µA) makes it suitable for battery-operated scales. The on-chip oscillator and 3-wire serial interface simplify system design, reducing component count and board space.
Recommended
Strain Gage Transducers
The AD7780BRUZ is designed for strain gage transducers, offering high precision and low noise. Its programmable gain amplifier (PGA) with gains up to 128 allows direct connection to low-level strain gage signals. The device's low power consumption is beneficial for portable or remote sensing applications. The sigma-delta architecture provides excellent noise rejection, ensuring accurate measurements in industrial environments.
Recommended
Pressure Sensors
The AD7780BRUZ is well-suited for pressure sensor applications, providing high-resolution conversion of bridge sensor outputs. Its low power consumption (330 µA) makes it ideal for battery-powered pressure transmitters. The on-chip oscillator and 3-wire serial interface simplify integration. The device's wide supply voltage range (2.7V to 5.25V) accommodates various system power rails.
Recommended
Portable Instrumentation
The AD7780BRUZ is perfect for portable instrumentation due to its ultra-low power consumption of 330 µA. It provides high-resolution 24-bit conversion for precise measurements in handheld devices. The small 16-TSSOP package saves board space, and the on-chip oscillator reduces external components. The device operates from a single 2.7V to 5.25V supply, making it compatible with battery-powered systems.
Recommended
Temperature Measurement
The AD7780BRUZ includes an on-chip temperature sensor, making it suitable for temperature measurement applications. It can directly digitize temperature sensor outputs with high resolution. The low power consumption is advantageous for battery-operated temperature loggers. The device's sigma-delta architecture provides stable and accurate readings over the -40°C to +105°C temperature range.
Recommended
Battery-Powered Systems
The AD7780BRUZ is specifically designed for battery-powered systems, consuming only 330 µA. Its low power consumption extends battery life in portable devices. The device includes a bridge power-down switch to further conserve power when not measuring. The wide supply voltage range and small package make it ideal for compact, energy-efficient designs.
Recommended
Recommended Products Summary
Engineering reference data for AD7780BRUZ — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | AD7780BRZ | AD7781BRUZ | AD7799BRUZ | AD7798BRUZ | AD7793BRUZ | AD7792BRUZ |
|---|---|---|---|---|---|---|---|
| Package | 16-TSSOP | 16-SOIC | 16-TSSOP | 16-TSSOP | 16-TSSOP | 16-TSSOP | 16-TSSOP |
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| Resolution | 24 Bit | 24 Bit | 24 Bit | 24 Bit | 24 Bit | 24 Bit | 24 Bit |
| Supply Voltage | 2.7V to 5.25V | 2.7V to 5.25V | 2.7V to 5.25V | 2.7V to 5.25V | 2.7V to 5.25V | 2.7V to 5.25V | 2.7V to 5.25V |
| Supply Current | 330 µA | 330 µA | 330 µA | 400 µA | 400 µA | 400 µA | 400 µA |
| Data Rate | 16.7 SPS | 16.7 SPS | 16.7 SPS | 470 SPS | 470 SPS | 470 SPS | 470 SPS |
| Programmable Gain | 1, 2, 4, 8, 16, 32, 64, 128 | 1, 2, 4, 8, 16, 32, 64, 128 | 1, 2, 4, 8, 16, 32, 64, 128 | 1, 2, 4, 8, 16, 32, 64, 128 | 1, 2, 4, 8, 16, 32, 64, 128 | 1, 2, 4, 8, 16, 32, 64, 128 | 1, 2, 4, 8, 16, 32, 64, 128 |
| On-Chip Oscillator | Yes | Yes | Yes | Yes | Yes | Yes | Yes |
Key Differentiators
- Ultra-low power consumption of 330 µA (vs AD7799BRUZ)
- Lower data rate for precision (vs AD7799BRUZ)
- On-chip oscillator (vs AD7780BRZ)
Design Notes
Decouple the AVDD and DVDD pins with 0.1 µF and 10 µF capacitors placed close to the device. Use separate analog and digital ground planes to minimize noise coupling. The AD7780BRUZ consumes only 330 µA, but proper decoupling is essential for maintaining the specified 24-bit performance.
Place the external reference and input filter components close to the REFIN and AIN pins. Use a low-noise reference voltage source to achieve the specified performance. Keep the analog input traces short and shielded to reduce interference.
Ensure the reference voltage is stable and low-noise. The AD7780BRUZ requires an external reference; using a noisy reference will degrade the ADC's performance. Also, avoid exceeding the absolute maximum ratings on any pin, and ensure proper power-up sequencing.
Compliance Information
RoHS compliant per Analog Devices product page. AEC-Q100 not applicable for this product.
