GENERAL DESCRIPTION

The ADCMP561/ADCMP562 are high speed comparators fabricated on Analog Devices’ proprietary XFCB process. The devices feature a 700 ps propagation delay with less than 75 ps overdrive dispersion. Dispersion, a measure of the difference in propagation delay under differing overdrive conditions, is a particularly important characteristic of comparators. A separate programmable hysteresis pin is available on the ADCMP562.

A differential input stage permits consistent propagation delay with a wide variety of signals in the common-mode range from −2.0 V to +3.0 V. Outputs are complementary digital signals that are fully compatible with PECL 10 K and 10 KH logic families. The outputs provide sufficient drive current to directly drive transmission lines terminated in 50 Ω to VDD − 2 V. A latch input, which is included, permits tracking, track-and-hold, or sample-and-hold modes of operation. The latch input pins contain internal pull-ups that set the latch in tracking mode when left open.

The ADCMP561/ADCMP562 are specified over the industrial temperature range (−40°C to +85°C).

FEATURES

  Differential PECL compatible outputs

  700 ps propagation delay input to output

  75 ps propagation delay dispersion

  Input common-mode range: –2.0 V to +3.0 V

  Robust input protection

  Differential latch control

  Internal latch pull-up resistors

  Power supply rejection greater than 85 dB

  700 ps minimum pulse width

  1.5 GHz equivalent input rise time bandwidth

  Typical output rise/fall time of 500 ps

  ESD protection > 4kV HBM, >200V MM

  Programmable hysteresis

APPLICATIONS

  Automatic test equipment

  High speed instrumentation

  Scope and logic analyzer front ends

  Window comparators

  High speed line receivers

  Threshold detection

  Peak detection

  High speed triggers

  Patient diagnostics

  Disk drive read channel detection

  Hand-held test instruments

  Zero-crossing detectors

  Line receivers and signal restoration

  Clock drivers