參數(shù)資料
型號: LM4889ITL/NOPB
廠商: NATIONAL SEMICONDUCTOR CORP
元件分類: 音頻/視頻放大
英文描述: 1 W, 1 CHANNEL, AUDIO AMPLIFIER, PBGA8
封裝: MICRO SMD-8
文件頁數(shù): 4/9頁
文件大?。?/td> 656K
代理商: LM4889ITL/NOPB
LA72914V
No.A1859-4/9
Pin Layout and Measurement circuit
Block Diagram and Application Circuit
1
2
3
4
5
6
7
8
VCC(5V)
FM_IN
Mode control
(TX,RX/STBY)
16
15
14
13
12
11
10
9
GND
De-emphasis
filter
Top view
FM_out
VREG filter
(2.4V)
Emphasis
filter
De-emphasis
Audio_in
Audio_out
FM filter
AGC filter
FMAGC
monitor
VCO_CTL
ALC filter
Audio_in
/TX_CTL
T1
T2
T3
T5
T7
T8
T9
T10
T11
T14
T15
T16
+
T1B
FM_out
GND
A
T5A
FM_IN
MODE_CTL
T6
De-emphasis
T16A
T12
T9B
AUDIO_IN
FMAGC_OUT
Sign: Highly accurate part use
Power supply
(VCC) 5V
1
2
4
5
6
7
VCC(5V)
8
16
15
14
13
12
11
10
9
: Push-pull output
VCO
Auto tune
FMAGC-OUT
Monitor
AGC
Filter
FM
Filter
+
Bias
2.4V
ALC
(1.0Vp-p)
6dB
AMP
10k LPF
Emphasis
FM-AMP
DRIVER
FM-
MOD
VCO
4.5M/6.5M
VREG
2.4V
FMAGC-DET
FMAGC
Phase
Detector
Loop
Filter
Offset
Cancel
VCO
6.5M/4.5M
Mode & Standby
Control
T4R6/STBY/T6R
6dB-AMP
DRIVER
Bias 2.4V
TRP
4.5M/6.5M
De-emphasis
3
ALC
Filter
+
Audio-OUT
(1Vp-p)
+
TX control
(High:TX-OFF
/Low:TX-ON)
FM-OUT
(2Vp-p)
Ripple
Filter
Emphasis
Filter
6800pF
BPF
1000pF
FM-IN
(0.1Vp-p)
State control
T6R4:P-Up
STBY:Open
T4R6:P-Down
De-emphasis
Filter
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