Overview
The LTC2345HUK-18 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 is part of the LTC2345 family and is known for its high precision and flexibility. It operates from a 5V low voltage supply and features differential, wide common mode range inputs. Each channel can be independently configured on a conversion-by-conversion basis to accept various signal ranges, including ±4.096V, 0V to 4.096V, ±2.048V, or 0V to 2.048V. The LTC2345HUK-18 is ideal for applications requiring wide dynamic range and high signal integrity.
Key Specifications
| Parameter | Value |
|---|---|
| Number of Bits | 18 |
| Number of Channels | 8 |
| Sampling Rate | 200 ksps per channel |
| Input Type | Differential |
| Data Interface | SPI CMOS (1.8V to 5V), LVDS |
| Supply Voltage (VDD) | 4.75V to 5.25V |
| Supply Voltage (OVDD) | 1.71V to 5.25V |
| Operating Temperature Range | –40°C to 85°C (H-Grade) |
| Package | 48-Pin QFN Exposed Pad |
| INL (Maximum, ±4.096V Range) | ±5LSB |
| SNR | 91.8dB |
| CMRR | 102dB |
Key Features
- Simultaneous sampling of all 8 channels
- Flexible SoftSpan™ interface allowing conversion-by-conversion control of the input voltage span on a per-channel basis
- Internal 2.048V reference and 2× buffer for simplified operation
- Option to use an external reference to increase input range and SNR
- Pin-selectable SPI CMOS (1.8V to 5V) and LVDS serial interfaces
- Configurable data output lanes (1 to 8 lanes in CMOS mode) for optimized bus width and throughput
- No missing codes at 18 bits and high signal-to-noise ratio (SNR)
- Wide input common mode range and high common mode rejection ratio (CMRR)
Applications
The LTC2345HUK-18 is suitable for a variety of applications that require high precision, wide dynamic range, and simultaneous sampling. These include:
- Industrial automation and control systems
- Medical imaging and diagnostic equipment
- Aerospace and defense systems
- High-performance data acquisition systems
- Test and measurement instruments
Q & A
- What is the resolution of the LTC2345HUK-18 ADC?
The LTC2345HUK-18 is an 18-bit ADC. - How many channels does the LTC2345HUK-18 have?
The LTC2345HUK-18 has 8 simultaneous sampling channels. - What is the sampling rate of the LTC2345HUK-18?
The sampling rate is 200 ksps per channel. - What types of input signals can the LTC2345HUK-18 accept?
The LTC2345HUK-18 can accept differential input signals with ranges of ±4.096V, 0V to 4.096V, ±2.048V, or 0V to 2.048V. - What are the supported data interfaces for the LTC2345HUK-18?
The LTC2345HUK-18 supports pin-selectable SPI CMOS (1.8V to 5V) and LVDS serial interfaces. - What is the operating temperature range of the LTC2345HUK-18?
The operating temperature range is –40°C to 85°C for the H-Grade version. - What is the package type of the LTC2345HUK-18?
The LTC2345HUK-18 comes in a 48-Pin QFN Exposed Pad package. - What is the typical supply voltage for the LTC2345HUK-18?
The typical supply voltage is 5V. - Does the LTC2345HUK-18 have any missing codes at 18 bits?
No, the LTC2345HUK-18 has no missing codes at 18 bits. - What is the common mode rejection ratio (CMRR) of the LTC2345HUK-18?
The CMRR is 102dB.
