Overview
The LTC2348-18, specifically the LTC2348CLX-18 model, is an 18-bit, low noise, 8-channel simultaneous sampling successive approximation register (SAR) analog-to-digital converter (ADC) produced by Analog Devices Inc. This device operates from a 5V low voltage supply and flexible high voltage supplies, utilizing an internal reference and buffer. Each channel can be independently configured on a conversion-by-conversion basis to accept various input voltage ranges, including ±10.24V, 0V to 10.24V, ±5.12V, or 0V to 5.12V. The LTC2348-18 is designed for high voltage applications requiring wide dynamic range and features a SoftSpan™ interface for flexible input voltage span control.
Key Specifications
| Parameter | Specification |
|---|---|
| Resolution | 18 bits |
| Number of Channels | 8 channels |
| Sample Rate | 200 ksps per channel |
| Input Voltage Range | ±10.24V, 0V to 10.24V, ±5.12V, 0V to 5.12V |
| Input Common Mode Range | Wide common mode range |
| CMRR | 118 dB |
| INL | ±3 LSB (maximum, ±10.24V range) |
| SNR | 96.7 dB |
| Supply Voltage (VCC) | –0.3V to (VEE + 40V) |
| Supply Voltage (VEE) | –17.4V to 0.3V |
| Supply Voltage Difference (VCC – VEE) | 40V |
| Analog Input Voltage | (VEE – 0.3V) to (VCC + 0.3V) |
| Serial Interface | Pin-selectable SPI CMOS (1.8V to 5V) and LVDS |
| Data Output Lanes | Between one and eight lanes in CMOS mode |
Key Features
- Simultaneous sampling of all 8 channels
- Flexible SoftSpan™ interface for conversion-by-conversion control of input voltage span
- Wide input common mode range and high CMRR (118 dB) for direct digitization of various signals
- No missing codes at 18 bits and ±3 LSB INL for high accuracy
- High SNR (96.7 dB) for excellent signal-to-noise performance
- Pin-selectable SPI CMOS (1.8V to 5V) and LVDS serial interfaces for flexible data output
- Ability to disable individual channels to increase throughput on remaining channels
Applications
- High voltage applications requiring wide dynamic range
- Industrial automation and control systems
- Instrumentation and measurement systems
- Motor and power control systems
- Aerospace and defense applications
- Healthcare and medical devices
- Energy and power monitoring systems
Q & A
- What is the resolution of the LTC2348-18 ADC?
The LTC2348-18 has a resolution of 18 bits.
- How many channels does the LTC2348-18 support?
The LTC2348-18 supports 8 simultaneous sampling channels.
- What is the sample rate of the LTC2348-18?
The sample rate is 200 ksps per channel.
- What are the input voltage ranges supported by the LTC2348-18?
The LTC2348-18 can accept ±10.24V, 0V to 10.24V, ±5.12V, or 0V to 5.12V signals.
- What is the CMRR of the LTC2348-18?
The CMRR is 118 dB.
- Can individual channels be disabled on the LTC2348-18?
- What serial interfaces are supported by the LTC2348-18?
The LTC2348-18 supports pin-selectable SPI CMOS (1.8V to 5V) and LVDS serial interfaces.
- How many data output lanes can be employed in CMOS mode?
Between one and eight lanes of data output can be employed in CMOS mode.
- What is the significance of the SoftSpan™ interface in the LTC2348-18?
The SoftSpan™ interface allows for conversion-by-conversion control of the input voltage span on a per-channel basis.
- What are some typical applications of the LTC2348-18?
Typical applications include high voltage applications, industrial automation, instrumentation and measurement, motor and power control, aerospace and defense, healthcare, and energy and power monitoring systems.
