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參數(shù)資料
| 型號(hào)： | 935241000118 |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | 通信及網(wǎng)絡(luò) |
| 英文描述： | SPECIALTY TELECOM CIRCUIT, PDSO20 |
| 封裝： | PLASTIC, SOT-266, SSOP-20 |
| 文件頁(yè)數(shù)： | 13/18頁(yè) |
| 文件大?。?/td> | 136K |
| 代理商： | 935241000118 |
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1997 May 26
4
Philips Semiconductors
Product specication
Low power PLL FM demodulator for
satellite TV receivers
TDA8012AM
PINNING
SYMBOL
PIN
DESCRIPTION
CDF1
1
carrier detector lter 1 input
CDF2
2
carrier detector lter 2 input
PD+
3
positive peak detector output
PD
4
negative peak detector output
IFI1
5
intermediate frequency input 1
IFI2
6
intermediate frequency input 2
GND
7
general ground
VCC
8
supply voltage
AGCO
9
automatic gain control output
Vth(AGC)
10
automatic gain control threshold
voltage input
VIDEO
11
baseband signal output
LF1
12
loop lter 1 input
LF2
13
loop lter 2 input
OSCGND
14
oscillator ground
VCO1
15
oscillator tank circuit 1 input
VCO2
16
oscillator tank circuit 2 input
AFCF
17
automatic frequency control lter
input
KEY
18
key pulse input
AFC/CDO
19
automatic frequency control
/carrier detector output
AFCOS
20
automatic frequency control offset
input
Fig.2 Pin configuration.
handbook, halfpage
TDA8012AM
MBH931
1
2
3
4
5
6
7
8
9
10
20
19
18
17
16
15
14
13
12
11
CDF1
CDF2
IFI1
IFI2
GND
AGCO
VCC
Vth(AGC)
PD
+
PD
AFCOS
VIDEO
LF1
LF2
OSCGND
VCO1
VCO2
AFCF
KEY
AFC/CDO
FUNCTIONAL DESCRIPTION
The TDA8012AM is a low power PLL FM demodulator
designed for use in satellite TV reception systems.
The demodulator is based on a PLL structure including a
fully balanced two-pin VCO. A high gain IF amplifier
ensures a high input sensitivity. The video output voltage
is supplied through a highly-linear video buffer with a low
output impedance. The centre frequency of the VCO and
the loop characteristics can be set by external components
(see Fig.4).
The circuit provides an AGC signal which is used to drive
a gain-controlled IF amplifier (TDA8011T or TDA8010AM)
for a stable PLL demodulation characteristic.
An analog AFC voltage is available. This signal fits in with
the input of the A/D converter port of the PLL frequency
synthesizer (TSA5055). The AFC function may be keyed
to address D2MAC systems.
The TDA8012AM includes a Carrier Detector (CD) used
for channel detection during search procedures.
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