Overview
The LTC2389-18, produced by Analog Devices Inc., is a high-performance, low-noise, 18-bit successive approximation register (SAR) analog-to-digital converter (ADC). This device operates from a single 5V supply and supports pin-configurable fully differential (±4.096V), pseudo-differential unipolar (0V to 4.096V), and pseudo-differential bipolar (±2.048V) analog input ranges. This versatility allows it to interface with multiple signal chain formats without the need for additional level translation or signal conditioning. The LTC2389-18 is characterized by its high speed, achieving a throughput rate of 2.5 Msps, and its high signal-to-noise ratio (SNR) of 99.8 dB (fully differential) and 95.2 dB (pseudo-differential).
Key Specifications
| Parameter | Value | Units |
|---|---|---|
| Number of Bits | 18 | |
| Sampling Rate | 2.5 Msps | |
| Input Type | Fully Differential, Pseudo-Differential Unipolar, Pseudo-Differential Bipolar | |
| Analog Input Range | ±4.096V, 0V to 4.096V, ±2.048V | V |
| Supply Voltage | 4.75 V to 5.25 V | V |
| SNR (Typical) | 99.8 dB (Fully Differential), 95.2 dB (Pseudo-Differential) | dB |
| Integral Non-Linearity (INL) | ±3 LSB (Maximum) | LSB |
| Power Consumption at 2.5 Msps | 162.5 mW | mW |
| Package | 48-pin LQFP | |
| Data Interface | Parallel, SPI | |
| Internal Reference Voltage | 4.096 V | V |
| Internal Reference Accuracy | 0.5% (Initial), ±20 ppm/°C (Temperature Coefficient) | % and ppm/°C |
Key Features
- High speed 2.5 Msps throughput with no cycle latency in parallel interface modes.
- Pin-configurable analog input ranges: fully differential (±4.096V), pseudo-differential unipolar (0V to 4.096V), and pseudo-differential bipolar (±2.048V).
- High signal-to-noise ratio (SNR): 99.8 dB (fully differential) and 95.2 dB (pseudo-differential).
- Precision internal 4.096V reference with 0.5% initial accuracy and ±20 ppm/°C temperature coefficient.
- Internal oscillator for setting conversion time, easing external timing considerations.
- Low power consumption: 162.5 mW at 2.5 Msps, with nap and sleep power-down modes.
- Parallel and SPI data interfaces.
- 48-pin LQFP package.
Applications
- Medical Imaging: High-resolution imaging requires high-speed and high-accuracy ADCs like the LTC2389-18.
- High Speed, Wide Dynamic Range Data Acquisition: Suitable for applications requiring fast and accurate data conversion.
- Industrial Process Control: Used in control systems that need precise and rapid analog-to-digital conversion.
- Instrumentation: Ideal for various measurement instruments due to its high accuracy and speed.
- Automated Test Equipment (ATE): For testing and measurement applications that demand high performance and reliability).
Q & A
- What is the resolution of the LTC2389-18 ADC?
The LTC2389-18 is an 18-bit successive approximation register (SAR) ADC).
- What are the supported analog input ranges for the LTC2389-18?
The LTC2389-18 supports pin-configurable fully differential (±4.096V), pseudo-differential unipolar (0V to 4.096V), and pseudo-differential bipolar (±2.048V) analog input ranges).
- What is the sampling rate of the LTC2389-18?
The LTC2389-18 has a sampling rate of 2.5 Msps).
- What is the signal-to-noise ratio (SNR) of the LTC2389-18?
The SNR is 99.8 dB (fully differential) and 95.2 dB (pseudo-differential)).
- What is the power consumption of the LTC2389-18 at 2.5 Msps?
The power consumption is 162.5 mW at 2.5 Msps).
- Does the LTC2389-18 have internal reference and buffer?
Yes, it includes a precision internal 4.096V reference with an internal reference buffer).
- What are the available data interfaces for the LTC2389-18?
The LTC2389-18 supports both parallel and SPI data interfaces).
- What is the package type of the LTC2389-18?
The LTC2389-18 is available in a 48-pin LQFP package).
- What are some typical applications of the LTC2389-18?
Typical applications include medical imaging, high-speed data acquisition, industrial process control, instrumentation, and automated test equipment (ATE)).
- How does the LTC2389-18 manage power consumption during inactive periods?
The LTC2389-18 has nap and sleep power-down modes to reduce power consumption during inactive periods).
