Overview
The LTC2358-18, 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 buffered differential inputs with a wide common mode range and picoamp inputs, making it ideal for high voltage applications requiring wide dynamic range. The ADC operates from a 5V low voltage supply and flexible high voltage supplies, allowing each channel to be independently configured on a conversion-by-conversion basis to accept various signal ranges (±10.24V, 0V to 10.24V, ±5.12V, or 0V to 5.12V). The integrated analog buffers and high common mode rejection ratio (CMRR) of 128dB enable direct digitization of a variety of signals with minimal board space and power consumption.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Resolution | 18-bit | |
| Number of Channels | 8 | |
| Sample Rate per Channel | 200 ksps | |
| Input Voltage Range | ±10.24V, 0V to 10.24V, ±5.12V, 0V to 5.12V | V |
| Common Mode Range | 30V P-P | V |
| Supply Voltage (VCC) | -0.3V to (VEE + 40V) | V |
| Supply Voltage (VEE) | -17.4V to 0.3V | V |
| Supply Voltage Difference (VCC - VEE) | 40V | V |
| Integral Nonlinearity (INL) | ±3.5 LSB | |
| Signal-to-Noise Ratio (SNR) | 96.4 dB | dB |
| Common Mode Rejection Ratio (CMRR) | 128 dB | dB |
| Serial Interface | SPI CMOS (1.8V to 5V), LVDS |
Key Features
- Buffered differential inputs with picoamp inputs and wide common mode range.
- Flexible SoftSpan™ interface allowing conversion-by-conversion control of the input voltage span on a per-channel basis.
- Internal 2.048V reference and 2X buffer for simplified operation.
- Option to use an external reference to increase the input range and SNR.
- Pin-selectable SPI CMOS (1.8V to 5V) and LVDS serial interfaces.
- Ability to optimize bus width and throughput by employing between one and eight lanes of data output in CMOS mode.
- No missing codes at 18 bits and high accuracy with ±3.5 LSB INL.
Applications
- Simultaneous sampling of 8 buffered channels.
- High voltage applications requiring wide dynamic range.
- Industrial data acquisition systems.
- Automotive and aerospace applications where high accuracy and wide input range are necessary.
- Medical devices and diagnostic equipment requiring precise signal measurement.
Q & A
- What is the resolution of the LTC2358-18 ADC?
The LTC2358-18 has an 18-bit resolution.
- How many channels does the LTC2358-18 support?
The LTC2358-18 supports 8 channels.
- What is the sample rate per channel of the LTC2358-18?
The sample rate per channel is 200 ksps.
- What are the input voltage ranges supported by the LTC2358-18?
The LTC2358-18 can accept ±10.24V, 0V to 10.24V, ±5.12V, or 0V to 5.12V signals.
- What is the common mode range of the LTC2358-18?
The common mode range is 30V P-P.
- What serial interfaces are supported by the LTC2358-18?
The LTC2358-18 supports SPI CMOS (1.8V to 5V) and LVDS serial interfaces.
- Can the input voltage span be controlled on a per-channel basis?
- What is the integral nonlinearity (INL) of the LTC2358-18?
The INL is ±3.5 LSB.
- What is the signal-to-noise ratio (SNR) of the LTC2358-18?
The SNR is 96.4 dB.
- Can individual channels be disabled to increase throughput on the remaining channels?
