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參數資料
| 型號： | LA7458W |
| 元件分類： | 消費家電 |
| 英文描述： | SPECIALTY CONSUMER CIRCUIT, PQFP64 |
| 封裝： | 10 X 10 MM, SQFP-64 |
| 文件頁數： | 22/22頁 |
| 文件大小： | 244K |
| 代理商： | LA7458W |
LA7458W
No.A0642-9/22
Continued from preceding page.
Pin
No.
Pin name
DC
voltage
AC
voltage
Function
Equivalent Circuit
15
EMPHASIS1
1.575V
This pin creates the NR emphasis 1
characteristics.
16
PLL QUICK
CHARGE
This pin is used to make the record
PLL pull-in time faster. (This is
performed forcibly internally at
power on.)
When from 2.0V to VCC2 : the PLL
quick charge function is enabled.
When from 0V to 1.0V or open: this
function is turned off.
17
PB FMIN
Playback FM input.
The standard input is a 15mVp-p
AFM signal.
18
BPF MONITER
130mVp-p
Bandpass filter output monitor.
19
REC FM OUT
220mVp-p
In record mode, the FM output.
In playback mode, functions as the
muting state monitor or if pin 27 is at
the ground level, the S/H and DO
monitor.
20
VCC L
3.15V
VCC3 for the block that handles
low-level audio signals. This is a
VCC that operates at 3.15V.
21
BPF ADJ
1.65V
Bandpass filter control current
control.
Continued on next page.
VCC1
15
7.7k
Ω
2.6k
Ω
50k
Ω
50k
Ω
16
30k
Ω
17
15k
Ω
200k
Ω
20pF
5pF
VCC1
REF
18
200
Ω
VCC1
100
μA
19
200
Ω
VCC1
160
μA
21
1k
Ω
40
μA
40
μA
VREF
VCC1
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