參數(shù)資料
型號: BU2615
廠商: Rohm CO.,LTD.
英文描述: PLL frequency synthesizer for tuners
中文描述: 鎖相環(huán)頻率合成器的調(diào)諧器
文件頁數(shù): 7/9頁
文件大小: 143K
代理商: BU2615
131
Audio ICs
BU2615S / BU2615FS
Frequency counter
(1)
Structure
(2)
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
D
0
: LSB
D
19
: 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.
How the frequency counter operates
Explanation of output data
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