Summary of High-speed comparator cuts delays to 2.9 ns
The LTC6752 is a high-speed comparator family supporting 280MHz toggle rates with 2.9ns propagation delay. It features rail-to-rail inputs, CMOS outputs, and options for separate supplies, shutdown pins, latches, and adjustable hysteresis. Available in multiple packages like TSOT-23 and QFN, it serves critical timing applications including clock recovery, level shifting, and time-of-flight measurements across temperatures from –40°C to 125°C.
Parts used in the LTC6752 Family:
- LTC6752 Comparator IC
- TSOT-23 Package Option
- SC70 Package Option
- MSOP Package Option
- 3mm × 3mm QFN Package Option
- Shutdown Pin
- Output Latch Feature
- Adjustable Hysteresis Control
- Complementary Outputs
- Separate Input/Output Supply Pins
Features
- Very High Toggle Rate: 280MHz
- Low Propagation Delay: 2.9ns
- Rail-to-Rail Inputs Extend Beyond Both Rails
- Output Current Capability: ±22mA
- Low Quiescent Current: 4.5mA
- Features within the LTC6752 Family:
- 2.45V to 5.25V Input Supply and 1.71V to 3.5V Output Supply (Separate Supply Option)
- 2.45V to 3.5V Supply (Single Supply Option)
- Shutdown Pin for Reduced Power
- Output Latch and Adjustable Hysteresis
- Complementary Outputs
- Packages: TSOT-23, SC70, MSOP, 3mm × 3mm QFN
- Direct Replacement for ADCMP60X Family
- Operating Temperature Range: –40°C to 125°C
Description
The LTC®6752 is a family of very high speed comparators capable of supporting toggle rates up to 280MHz. These comparators exhibit low propagation delays of 2.9ns, and fast rise/fall times of 1.2ns. There are a total of 5 members in the LTC6752 family, with different options for separate input and output supplies, shutdown, output latch, adjustable hysteresis, complementary outputs, and package.
The LTC6752 comparators have rail-to-rail inputs that operate from 2.45V, up to 3.5V or 5.25V, depending on the option. The outputs are CMOS and the separate supply options can operate down to 1.71V, allowing for directly interfacing to 1.8V logic devices.
The low propagation delay of only 2.9ns combined with low dispersion of only 1.8ns (10mV to 125mV overdrive variation) makes these comparators an excellent choice for critical timing applications. Similarly, the fast toggle rate and the low jitter of 4.5ps RMS (100mVP-P, 100MHz input) make the LTC6752 family ideally suited for high frequency line driver and clock recovery circuits.
Applications
- Clock and Data Recovery
- Level Shifting
- High Speed Data Acquisition Systems
- Window Comparators
- High Speed Line Receivers
- Fast Crystal Oscillators
- Time of Flight Measurements
- Time Domain Reflectometry
For more detail: High-speed comparator cuts delays to 2.9 ns
- What is the maximum toggle rate of the LTC6752?
The LTC6752 supports very high toggle rates up to 280MHz. - How fast is the propagation delay?
The comparators exhibit low propagation delays of 2.9ns. - Can the inputs operate beyond the supply rails?
Yes, the device features rail-to-rail inputs that extend beyond both rails. - What is the output current capability?
The output current capability is ±22mA. - Does the LTC6752 support separate input and output supplies?
Yes, some members offer separate input and output supply options ranging from 2.45V to 5.25V and 1.71V to 3.5V respectively. - Is there a way to reduce power consumption?
A shutdown pin is included for reduced power modes. - What is the RMS jitter performance at 100MHz?
The device has a low jitter of 4.5ps RMS when tested with a 100mVP-P signal at 100MHz. - Which applications are these comparators best suited for?
They are ideally suited for clock and data recovery, level shifting, and time of flight measurements.
