BU2615S View Datasheet(PDF) - ROHM Semiconductor

Part Name

Description

Manufacturer

BU2615S

PLL frequency synthesizer for tuners

ROHM Semiconductor 

Audio ICs

FHow the frequency counter and unlock detection circuit operate

(1) When CT = 1: Frequency count and unlock detec-

tion are carried out.

BU2615S / BU2615FS

(2) When CT = 0 and GT = 1: Only unlock detection is

carried out.

FExplanation of CD terminal

When frequency measurement or unlock detection is fin-

ished, the CD terminal goes to LO to indicate that the

count and unlock detection have finished. It also syn-

chronizes with CK to output counter data. When the next

data is input, it goes to HI.

132

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