Overview
The LTC2257CUJ-14 is a 14-bit analog-to-digital converter (ADC) designed by Analog Devices Inc., formerly part of Linear Technology. This ADC is optimized for digitizing high-frequency, wide dynamic range signals, making it ideal for demanding communications applications. It features low power consumption, high signal-to-noise ratio (SNR), and spurious free dynamic range (SFDR), along with various output modes and configuration options.
Key Specifications
| Parameter | Value | Units |
|---|---|---|
| Resolution | 14 | Bits |
| Sampling Rate | 40 Msps | |
| SNR | 74 dB | |
| SFDR | 88 dB | |
| Power Consumption | 81 mW / 49 mW / 35 mW | |
| Supply Voltage | 1.7 V to 1.9 V | V |
| Input Range | 1 Vpp to 2 Vpp | |
| Full-Power Bandwidth S/H | 800 MHz | |
| Output Modes | CMOS, DDR CMOS, DDR LVDS | |
| Package | 40-Pin (6mm × 6mm) QFN |
Key Features
- Ultralow jitter of 0.17 ps RMS, allowing undersampling of IF frequencies with excellent noise performance.
- Optional data output randomizer and clock duty cycle stabilizer for high performance across various clock duty cycles.
- Shutdown and nap modes for power management.
- Serial SPI port for configuration.
- Pin compatible with 14-bit and 12-bit versions.
- Selectable input ranges: 1 Vpp to 2 Vpp.
- Separate output power supply allowing CMOS output swing from 1.2 V to 1.8 V.
- ENC+ and ENC– inputs can be driven differentially or single-ended with various input types (sine wave, PECL, LVDS, TTL, or CMOS).
Applications
- Communications
- Cellular Base Stations
- Software Defined Radios
- Portable Medical Imaging
- Multi-Channel Data Acquisition
- Nondestructive Testing
Q & A
- What is the resolution of the LTC2257CUJ-14 ADC?
The resolution of the LTC2257CUJ-14 is 14 bits.
- What are the sampling rates available for the LTC2257CUJ-14?
The LTC2257CUJ-14 has sampling rates of 65 Msps, 40 Msps, and 25 Msps, but the specific model LTC2257CUJ-14 operates at 40 Msps.
- What is the typical power consumption of the LTC2257CUJ-14?
The typical power consumption is 81 mW, with lower power modes available at 49 mW and 35 mW.
- What are the output modes available for the LTC2257CUJ-14?
The output modes include full rate CMOS, double data rate CMOS, and double data rate LVDS.
- What is the full-power bandwidth of the sample and hold (S/H) circuit?
The full-power bandwidth of the S/H circuit is 800 MHz.
- Does the LTC2257CUJ-14 support different input ranges?
Yes, the input range is selectable from 1 Vpp to 2 Vpp.
- How can the ENC+ and ENC– inputs be driven?
The ENC+ and ENC– inputs can be driven differentially or single-ended with sine wave, PECL, LVDS, TTL, or CMOS inputs.
- What power management features are available on the LTC2257CUJ-14?
The device features shutdown and nap modes for power management.
- Is the LTC2257CUJ-14 pin compatible with other versions?
Yes, it is pin compatible with 14-bit and 12-bit versions.
- What is the package type of the LTC2257CUJ-14?
The package type is a 40-Pin (6mm × 6mm) QFN.
