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Product Detailed Parameters
- Description：HI SPEED COMPARATOR ECL OUTPUT
- Series：-
- Mfr：Analog Devices Inc.
- Package：Bulk
- Type：-
- Number of Elements：-
- Output Type：-
- Voltage - Supply, Single/Dual (±)：-
- Voltage - Input Offset (Max)：-
- Current - Input Bias (Max)：-
- Current - Output (Typ)：-
- Current - Quiescent (Max)：-
- CMRR, PSRR (Typ)：-
- Propagation Delay (Max)：-
- Hysteresis：-
- Operating Temperature：-
- Package / Case：-
- Mounting Type：-
- Supplier Device Package：-
- Grade：-
- Qualification：-
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Overview
The LT685CH is an ultrafast comparator featuring differential inputs and complementary ECL-compatible outputs. It provides a typical propagation delay of 5.5ns at 25°C, with a maximum of 6.5ns across the operating temperature range. The device includes an external hysteresis control pin and a latch enable function for sample-hold applications. It operates within a supply voltage range of +7V to -7V and supports driving 50Ω transmission lines.
Feature Summary
- Ultrafast switching speed with low input offset voltage
- Complementary ECL logic level outputs suitable for high-speed digital processing
- Integrated latch function allowing output state locking for sample-hold modes
- External hysteresis control via a dedicated pin to minimize oscillation
Applications
- High-speed analog-to-digital converters
- High-speed sampling circuits
- Oscillators
Procurement Notes
Verify package availability as the H Package (TO-5) is marked obsolete in official documentation. Confirm that the N16 package is accepted as an alternate source if required. Ensure the component meets the specific operating temperature requirements for the LT685C grade before procurement.
Selection Notes
Select this component for applications requiring sub-nanosecond resolution and ECL interface compatibility. Consider the LT685CH when driving 50Ω loads directly or utilizing the internal latch for signal acquisition. Verify power dissipation limits against ambient temperature derating curves for the chosen package style.
Part Context
The LT685CH belongs to the LT685 family of ultrafast comparators manufactured by Analog Devices Inc. (formerly Linear Technology). It is designed for precision signal processing where speed and low offset are critical. The 'CH' designation indicates the commercial temperature grade (-30°C to 85°C) housed in the TO-5 metal can package.
Replacement Considerations
The datasheet identifies the Am685 as a pin-compatible alternative. For the obsolete H Package, the N16 package is suggested as an alternate source.
