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BU2614FS 数据表(PDF) 7 Page - Rohm

部件名 BU2614FS
功能描述  PLL frequency synthesizer for tuners
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制造商  ROHM [Rohm]
网页  http://www.rohm.com
标志 ROHM - Rohm

BU2614FS 数据表(HTML) 7 Page - Rohm

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122
Audio ICs
BU2614 / BU2614FS
FFrequency counter
(1)
Structure
(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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