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 flexibility 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 and precision, achieving a throughput rate of 2.5 Msps with no cycle latency in parallel interface modes. It includes a precision internal 4.096V reference with a guaranteed 0.5% initial accuracy and a ±20ppm/°C temperature coefficient, along with an internal reference buffer. The device is highly suited for a wide variety of high-speed applications due to its fast conversion time and low power consumption of 162.5mW at 2.5Msps.
Key Specifications
| Parameter | Value | Units |
|---|---|---|
| Resolution | 18 bits | |
| Number of Channels | 1 Channel | |
| Sampling Rate | 2.5 Msps | |
| Analog Supply Voltage | 5 V | |
| Input Type | Differential/Pseudo-Differential/Single-Ended | |
| Data Interface | SPI, Parallel | |
| Integral Nonlinearity (INL) | ±3 LSB (maximum) | |
| Differential Nonlinearity (DNL) | 0.3 LSB | |
| Signal to Noise and Distortion Ratio (SINAD) | 99.7 dB | |
| Spurious Free Dynamic Range (SFDR) | 117 dB | |
| Total Harmonic Distortion (THD) | -116 dB | |
| Power Dissipation | 162.5 mW | |
| Operating Temperature | 0°C to 70°C | |
| Package | 48-Lead QFN (7mm x 7mm x 0.75mm w/ EP) |
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).
- Precision internal 4.096V reference with 0.5% initial accuracy and ±20ppm/°C temperature coefficient.
- Internal reference buffer.
- Low power consumption: 162.5mW at 2.5Msps, with nap and sleep power-down modes.
- Internal oscillator for conversion time setting.
- No missing codes at 18 bits.
- High SNR: 99.8dB (fully differential) and 95.2dB (pseudo differential).
- SPI and parallel data interfaces.
Applications
- High-speed data acquisition systems.
- Medical imaging and diagnostics.
- Industrial control and automation.
- Aerospace and defense applications requiring high precision and speed.
- Test and measurement equipment.
- Automotive systems requiring precise analog-to-digital conversion.
Q & A
- What is the resolution of the LTC2389-18 ADC?
The LTC2389-18 has a resolution of 18 bits.
- 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 sampling rate of the LTC2389-18 is 2.5 Msps.
- 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 power-down modes?
Yes, the LTC2389-18 has nap and sleep power-down modes to reduce power consumption during inactive periods.
- What is the SNR of the LTC2389-18 in fully differential mode?
The SNR in fully differential mode is 99.8 dB.
- What data interfaces does the LTC2389-18 support?
The LTC2389-18 supports SPI and parallel data interfaces.
- What is the operating temperature range of the LTC2389-18?
The operating temperature range is 0°C to 70°C.
- What is the package type of the LTC2389-18?
The LTC2389-18 is available in a 48-Lead QFN (7mm x 7mm x 0.75mm w/ EP) package.
- Does the LTC2389-18 have an internal oscillator for conversion time setting?
Yes, the LTC2389-18 includes an internal oscillator for setting the conversion time.
