Overview
The LTC2489CDE#PBF is a high-precision, 16-bit, 2-/4-channel ΔΣ analog-to-digital converter (ADC) manufactured by Analog Devices Inc. This device features Easy Drive technology and a 2-wire I2C interface, making it suitable for a wide range of applications requiring high accuracy and low noise. The LTC2489 is designed to eliminate dynamic input current errors and the shortcomings of on-chip buffering, allowing it to directly digitize high impedance sensors with full accuracy.
Key Specifications
| Parameter | Value |
|---|---|
| Resolution | 16-bit |
| Number of Channels | 2 differential or 4 single-ended |
| Input Range | 0V to VCC |
| Interface | 2-wire I2C |
| Noise | 600nV RMS (0.02LSB transition noise) |
| Integral Non-Linearity (INL) | 2ppm |
| Offset Error | 1ppm |
| Full-Scale Error | 15ppm |
| Supply Voltage | 2.7V to 5.5V |
| Power Consumption | 0.8mW |
| Operating Temperature Range | 0°C to 70°C (LTC2489C), -40°C to 85°C (LTC2489I) |
| Package | 14-Lead DFN (4mm x 3mm w/ EP) |
Key Features
- Easy Drive technology for zero differential input current, enabling direct digitization of high impedance sensors with full accuracy.
- Integrated oscillator and automatic cancellation of differential input current.
- Wide common mode input range (0V to VCC) independent of the reference voltage.
- Simultaneous rejection of 50Hz and 60Hz line frequencies.
- No latency: digital filter settles in a single cycle, even after a new channel is selected.
- 2-wire I2C interface with 9 addresses plus one global address for synchronization.
- Auto calibration continuously removes offset and drift associated with external amplifiers.
Applications
The LTC2489 is suitable for various applications requiring high precision and low noise, such as industrial automation, medical devices, and precision measurement systems. It is particularly useful in scenarios where high impedance sensors need to be directly digitized without compromising accuracy.
Q & A
- What is the resolution of the LTC2489 ADC?
The LTC2489 has a 16-bit resolution. - How many channels does the LTC2489 support?
The LTC2489 supports up to 2 differential or 4 single-ended channels. - What is the input range of the LTC2489?
The input range is from 0V to VCC. - What interface does the LTC2489 use?
The LTC2489 uses a 2-wire I2C interface. - What is the noise performance of the LTC2489?
The noise performance is 600nV RMS (0.02LSB transition noise). - What is the power consumption of the LTC2489?
The power consumption is 0.8mW. - What are the operating temperature ranges for the LTC2489?
The operating temperature ranges are 0°C to 70°C for the LTC2489C and -40°C to 85°C for the LTC2489I. - What package options are available for the LTC2489?
The LTC2489 is available in a 14-Lead DFN (4mm x 3mm w/ EP) package. - Does the LTC2489 support simultaneous rejection of line frequencies?
Yes, the LTC2489 automatically rejects 50Hz and 60Hz line frequencies simultaneously. - Is there any latency in the digital filter of the LTC2489?
No, the digital filter settles in a single cycle, even after a new channel is selected.
