Overview
The LTC2345-18, produced by Analog Devices Inc., is an 18-bit, low noise, 8-channel simultaneous sampling successive approximation register (SAR) analog-to-digital converter (ADC). This device features differential inputs with a wide common mode range, making it suitable for a variety of applications requiring high precision and dynamic range. Operating from a 5V low voltage supply, the LTC2345-18 utilizes an internal reference and buffer, allowing each channel to be independently configured on a conversion-by-conversion basis to accept different signal ranges (±4.096V, 0V to 4.096V, ±2.048V, or 0V to 2.048V). The ADC supports pin-selectable SPI CMOS (1.8V to 5V) and LVDS serial interfaces, enabling flexible data output configurations.
Key Specifications
| Parameter | Value | Units |
|---|---|---|
| Number of Bits | 18 | |
| Number of Channels | 8 | |
| Sampling Rate | 200 ksps | |
| Input Voltage Range | ±4.096V, 0V to 4.096V, ±2.048V, 0V to 2.048V | V |
| Supply Voltage (VDD) | 4.75 to 5.25 | V |
| Supply Voltage (OVDD) | 1.71 to 5.25 | V |
| Integral Nonlinearity (INL) | ±5 LSB | |
| Signal-to-Noise Ratio (SNR) | 91.8 dB | dB |
| Common Mode Rejection Ratio (CMRR) | 102 dB | dB |
| Interface | SPI CMOS (1.8V to 5V), LVDS | |
| Package | 48-Lead QFN (7mm x 7mm x 0.75mm w/ EP) | |
| Operating Temperature Range | 0°C to 70°C (C-Grade), –40°C to 85°C (I-Grade), –40°C to 125°C (H-Grade) | °C |
Key Features
- Differential, wide common mode range inputs
- Simultaneous sampling of all 8 channels
- Flexible input voltage ranges: ±4.096V, 0V to 4.096V, ±2.048V, 0V to 2.048V
- Internal 2.048V reference and 2× buffer
- Pin-selectable SPI CMOS (1.8V to 5V) and LVDS serial interfaces
- Configurable data output width (1 to 8 lanes in CMOS mode)
- High signal-to-noise ratio (SNR) of 91.8 dB and low integral nonlinearity (INL) of ±5 LSB
- No missing codes at 18 bits
- Low power consumption with power-down modes
Applications
- Communications
- Industrial automation
- Instrumentation and measurement
- Aerospace and defense
- Motor and power control
- Healthcare
Q & A
- What is the resolution of the LTC2345-18 ADC?
The LTC2345-18 is an 18-bit ADC.
- How many channels does the LTC2345-18 support?
The LTC2345-18 supports 8 simultaneous sampling channels.
- What are the input voltage ranges for the LTC2345-18?
The input voltage ranges are ±4.096V, 0V to 4.096V, ±2.048V, and 0V to 2.048V.
- What is the sampling rate of the LTC2345-18?
The sampling rate is 200 ksps per channel.
- What interfaces does the LTC2345-18 support?
The LTC2345-18 supports pin-selectable SPI CMOS (1.8V to 5V) and LVDS serial interfaces.
- What is the common mode rejection ratio (CMRR) of the LTC2345-18?
The CMRR is 102 dB.
- Can individual channels be disabled on the LTC2345-18?
Yes, individual channels can be disabled to increase throughput on the remaining channels.
- What is the signal-to-noise ratio (SNR) of the LTC2345-18?
The SNR is 91.8 dB.
- What is the package type of the LTC2345-18?
The package type is a 48-Lead QFN (7mm x 7mm x 0.75mm w/ EP).
- What are the operating temperature ranges for the LTC2345-18?
The operating temperature ranges are 0°C to 70°C (C-Grade), –40°C to 85°C (I-Grade), and –40°C to 125°C (H-Grade).
