Overview
The LTC2220CUP, produced by Analog Devices Inc., is a high-performance 12-bit analog-to-digital converter (ADC) designed to digitize high-frequency, wide dynamic range signals. This ADC is part of the LTC2220 and LTC2221 family, which are optimized for demanding communications applications. The LTC2220 operates at a sampling rate of 170 Msps, while the LTC2221 operates at 135 Msps. These converters are known for their excellent AC performance, including a signal-to-noise ratio (SNR) of 67.5 dB and a spurious free dynamic range (SFDR) of 80 dB for signals up to 170 MHz.
Key Specifications
| Parameter | Conditions | Min | Typ | Max | Units |
|---|---|---|---|---|---|
| Sampling Frequency | 1 | 170 | MHz | ||
| Analog Input Range | 3.1V < VDD < 3.5V | ±0.5 | ±1 | V | |
| Analog Input Common Mode | Differential Input | 1 | 1.6 | 1.9 | V |
| Analog Input Leakage Current | 0 < AIN+, AIN– < VDD | -1 | 1 | µA | |
| Sample and Hold Acquisition Delay Time Jitter | 0.15 | psRMS | |||
| Analog Supply Voltage | 3.1 | 3.3 | 3.5 | V | |
| Analog Supply Current | 264 | 288 | mA | ||
| Power Dissipation | 890 | mW | |||
| Output Supply Voltage (LVDS) | 3 | 3.3 | 3.6 | V | |
| Output Supply Current (LVDS) | 55 | 70 | mA |
Key Features
- High sampling rates: 170 Msps for LTC2220 and 135 Msps for LTC2221.
- Excellent AC performance: 67.5 dB SNR and 80 dB SFDR for signals up to 170 MHz.
- Low jitter: 0.15 psRMS, enabling undersampling of IF frequencies with excellent noise performance.
- DC specifications include ±0.4 LSB INL (typ), ±0.3 LSB DNL (typ), and no missing codes over temperature.
- Low transition noise: 0.5 LSB RMS.
- Digital outputs available in differential LVDS or single-ended CMOS, with three CMOS output format options.
- Selectable input ranges: ±0.5 V or ±1 V.
- Optional clock duty cycle stabilizer for high performance across various clock duty cycles.
- Shutdown and nap modes for power management.
- Data ready output clock.
- 64-pin 9mm × 9mm QFN package.
Applications
- Wireless and wired broadband communication systems.
- Cable head-end systems.
- Power amplifier linearization.
- Communications test equipment.
Q & A
- What is the sampling rate of the LTC2220 ADC?
The LTC2220 ADC has a sampling rate of 170 Msps. - What is the signal-to-noise ratio (SNR) of the LTC2220?
The SNR of the LTC2220 is 67.5 dB up to 140 MHz input. - What are the available output formats for the LTC2220?
The digital outputs can be either differential LVDS or single-ended CMOS, with three CMOS output format options. - What is the power dissipation of the LTC2220 in full power mode?
The power dissipation is approximately 890 mW. - Does the LTC2220 have any power-saving modes?
Yes, it has shutdown and nap modes for power management. - What is the typical analog input leakage current of the LTC2220?
The typical analog input leakage current is 1 µA. - What is the full power bandwidth of the sample and hold circuit?
The full power bandwidth is 775 MHz. - Can the LTC2220 handle different types of clock inputs?
Yes, it can handle sine wave, PECL, LVDS, TTL, or CMOS clock inputs. - What is the package type of the LTC2220?
The LTC2220 comes in a 64-pin 9mm × 9mm QFN package. - What are some common applications of the LTC2220?
Common applications include wireless and wired broadband communication systems, cable head-end systems, power amplifier linearization, and communications test equipment.
