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LT1671CMS8

60ns, Low Power, Single Supply, Ground-Sensing Comparator

Linear Technology 

LT1671

APPLICATIONS INFORMATION

Crystal Oscillators

Figure 7 shows a crystal oscillator circuit. In the circuit, the

resistors at the LT1671’s positive input set a DC bias point.

The 2k-0.068µF path sets up phase shifted feedback and

the circuit looks like a wideband unity-gain follower at DC.

The crystal’s path provides resonant positive feedback

and stable oscillation occurs.

5V

2k

1MHz TO 10MHz

CRYSTAL (AT-CUT)

+

2k

LT1671

–

2k

0.068µF

OUTPUT

1671 F07

Switchable Output Crystal Oscillator

Figure 8 permits crystals to be electronically switched by

logic commands. This circuit is similar to the previous

examples, except that oscillation is only possible when

one of the logic inputs is biased high.

5V

1k

1k

XTAL X

XTAL B

XTAL A

+

LT1671

–

RX

DX 1k

1k

D1 D2

2k

75pF

= 1N4148

GROUND XTAL CASES

LOGIC INPUTS

AS MANY STAGES

AS DESIRED

B

A

OUTPUT

1671 F08

Figure 7. 1MHz to 10MHz Crystal Oscillator

Figure 8. Switchable Output Crystal Oscillator. Biasing A or B

High Places Associated Crystal in Feedback Path. Additional

Crystal Branches Are Permissible

10

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