Overview
The LTC2157CUP-12 is a high-performance, dual 12-bit analog-to-digital converter (ADC) produced by Analog Devices Inc. This component is part of the LTC2157 family, designed to digitize high-frequency, wide dynamic range signals. It is particularly suited for demanding communications applications due to its excellent AC performance, including a signal-to-noise ratio (SNR) of 68.5dB and a spurious free dynamic range (SFDR) of 90dB. The ADC features a 1.25GHz input bandwidth, enabling high undersampling ratios with minimal attenuation, and a latency of only five clock cycles.
Key Specifications
| Parameter | Typical Value | Units |
|---|---|---|
| Resolution | 12 | Bits |
| Sampling Rate | 250 Msps | |
| Integral Linearity Error (INL) | ±0.26 LSB | |
| Differential Linearity Error (DNL) | ±0.16 LSB | |
| Signal-to-Noise Ratio (SNR) | 68.5 dB | |
| Spurious Free Dynamic Range (SFDR) | 90 dB | |
| Input Bandwidth | 1.25 GHz | |
| Latency | 5 clock cycles | |
| Analog Supply Voltage (VDD) | 1.7 V to 1.9 V | |
| Digital Output Type | DDR LVDS | |
| Operating Temperature Range | 0°C to 70°C | |
| Package Type | 64-QFN (9mm × 9mm) |
Key Features
- High-speed sampling at 250 Msps with 12-bit resolution.
- Excellent AC performance with 68.5dB SNR and 90dB SFDR.
- 1.25GHz input bandwidth for high undersampling ratios.
- Low latency of only five clock cycles.
- Double data rate (DDR) LVDS digital outputs.
- Optional clock duty cycle stabilizer for high performance across various clock duty cycles.
- Single 1.8V supply voltage.
- Low power sleep and nap modes.
- Serial SPI port for configuration.
- Simultaneous sampling of two channels.
Applications
- Communications systems, including cellular base stations and software-defined radios.
- Medical imaging equipment.
- High-definition video applications.
- Testing and measurement instruments.
Q & A
- What is the sampling rate of the LTC2157CUP-12?
The LTC2157CUP-12 has a sampling rate of 250 Msps.
- What is the resolution of the LTC2157CUP-12?
The resolution of the LTC2157CUP-12 is 12 bits.
- What is the input bandwidth of the LTC2157CUP-12?
The input bandwidth of the LTC2157CUP-12 is 1.25 GHz.
- What type of digital outputs does the LTC2157CUP-12 have?
The LTC2157CUP-12 has double data rate (DDR) LVDS digital outputs.
- What is the latency of the LTC2157CUP-12?
The latency of the LTC2157CUP-12 is only five clock cycles.
- What is the operating temperature range of the LTC2157CUP-12?
The operating temperature range of the LTC2157CUP-12 is 0°C to 70°C.
- What package type does the LTC2157CUP-12 come in?
The LTC2157CUP-12 comes in a 64-QFN (9mm × 9mm) package.
- Does the LTC2157CUP-12 have low power modes?
Yes, the LTC2157CUP-12 has low power sleep and nap modes.
- Can the LTC2157CUP-12 be configured via a serial interface?
Yes, the LTC2157CUP-12 has a serial SPI port for configuration.
- What are some common applications of the LTC2157CUP-12?
The LTC2157CUP-12 is commonly used in communications systems, medical imaging, high-definition video, and testing and measurement instruments.
