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BU2624 Folha de dados(PDF) 7 Page - Rohm

Nome de Peças BU2624
Descrição Electrónicos  PLL frequency synthesizer for tuners
Download  9 Pages
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Fabricante Electrônico  ROHM [Rohm]
Página de início  http://www.rohm.com
Logo ROHM - Rohm

BU2624 Folha de dados(HTML) 7 Page - Rohm

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Audio ICs
BU2624AF
Frequency 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, amp input goes
to pulldown and the counter is reset.
Measuring time (gate pulse) is selected (8 ms / 16 ms) 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
Unlock detection
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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