BU2614 Просмотр технического описания (PDF) - ROHM Semiconductor

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производитель

BU2614

PLL frequency synthesizer for tuners

ROHM Semiconductor 

Audio ICs

FFrequency counter

(1) Structure

BU2614 / BU2614FS

(2) How the frequency counter operates

When control data CT equals 1, the 20-bit counter and

the amp go into operation. When CT equals 0, input pull-

down and the counter are reset. Measuring time (gate

pulse) is selected (16ms / 32ms) on the basis of control

data GT. When control data CT equals 0, the counter is

reset.

(3) Explanation of output data

D0: LSB D19: MSB

How the unlock detection circuit operates

When control data GT equals 1, or CT equals 1, the un-

lock detection circuit goes into operation for 8ms. When

CT equals 1, the unlock detection circuits stops operating

before the frequency counter gate pulse is emitted.

When CT equals 0, or GT equals 0, the unlock detection

circuit is reset.

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