Overview
The AD7780BRZ-REEL, produced by Analog Devices Inc., is a 24-bit, pin-programmable, ultralow power sigma-delta analog-to-digital converter (ADC). This device is designed for high precision and low power consumption, making it ideal for portable or battery-operated applications. It features an on-chip, low noise programmable gain amplifier (PGA) and an internal oscillator. The AD7780BRZ-REEL operates within a temperature range of −40°C to +105°C and is available in a 14-lead SOIC package.
Key Specifications
| Parameter | Min | Typ | Max | Unit | Test Conditions/Comments |
|---|---|---|---|---|---|
| Resolution | 24 bits | ||||
| Sampling Rate | 16.7 sps or 10 sps | ||||
| Power Supply Voltage | 2.7 | 5.25 | V | AVDD to GND, DVDD to GND | |
| Power Supply Current (Gain = 1) | 115 | 130 | 160 | μA | AVDD = 3 V, AVDD = 5 V |
| Power Supply Current (Gain = 128) | 330 | 420 | 500 | μA | AVDD = 3 V, AVDD = 5 V |
| Power-Down/Reset Mode Current | 10 | μA | |||
| Input Voltage Range (PGA Gain = 1) | ±5 V | Differential input | |||
| Input Voltage Range (PGA Gain = 128) | ±39 mV | Differential input | |||
| Settling Time (16.7 Hz Update Rate) | 120 ms | ||||
| Settling Time (10 Hz Update Rate) | 300 ms | ||||
Key Features
- High Precision: 24-bit sigma-delta ADC for precise analog-to-digital conversion.
- Low Power Consumption: Consumes only 330 μA in normal operation and 10 μA in power-down mode.
- Programmable Gain Amplifier (PGA): On-chip PGA with gains of 1 or 128.
- Internal Oscillator: Built-in oscillator for clock generation.
- Filter Response Options: Two filter response options providing superior dynamic performance and low frequency vibration rejection.
- Simultaneous 50 Hz/60 Hz Rejection: Effective rejection of power line frequencies at both update rates.
- Power-Down Mode: Allows switching off power to the bridge sensor and ADC when not converting to extend battery life.
- Status Bits: Eight status bits appended to each 24-bit conversion for data validity confirmation.
Applications
- Portable and Battery-Operated Devices: Ideal for applications requiring very low power consumption.
- Load Cell Applications: Effective in rejecting low frequency mechanical vibrations of load cells.
- Strain Gages and Pressure Sensors: Suitable for precision measurement in strain gage and pressure sensor applications.
- Industrial Automation: Used in various industrial automation applications requiring high precision and low power.
Q & A
- What is the resolution of the AD7780BRZ-REEL ADC?
The AD7780BRZ-REEL has a resolution of 24 bits.
- What are the available sampling rates for the AD7780BRZ-REEL?
The AD7780BRZ-REEL supports sampling rates of 16.7 sps and 10 sps.
- What is the power supply voltage range for the AD7780BRZ-REEL?
The power supply voltage range is from 2.7 V to 5.25 V.
- How much current does the AD7780BRZ-REEL consume in normal operation?
The device consumes 115 μA to 160 μA in normal operation depending on the gain setting and supply voltage.
- What is the gain range of the on-chip PGA?
The on-chip PGA has gains of 1 or 128.
- Does the AD7780BRZ-REEL have a power-down mode?
Yes, it has a power-down mode that reduces current consumption to 10 μA.
- What is the settling time for the 16.7 Hz update rate?
The settling time for the 16.7 Hz update rate is 120 ms.
- What is the settling time for the 10 Hz update rate?
The settling time for the 10 Hz update rate is 300 ms.
- Does the AD7780BRZ-REEL support simultaneous 50 Hz/60 Hz rejection?
Yes, it supports simultaneous 50 Hz/60 Hz rejection at both update rates.
- What package options are available for the AD7780BRZ-REEL?
The device is available in a 14-lead SOIC package.
