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PDF SA9801 Data sheet ( Hoja de datos )
| Número de pieza | SA9801 | |
| Descripción | SINGLE STANDARD VIF-PLL DEMODULATOR AND FM-PLL DETECTOR | |
| Fabricantes | Silan Microelectronics | |
| Logotipo |  |
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SA9801
SINGLE STANDARD VIF-PLL DEMODULATOR AND FM-PLL DETECTOR
DESCRIPTION
The SA9801 is a monolithic integrated circuit for vision and sound IF
signal processing in TV and VTR sets and multimedia front-ends.
FEATURES
∗ Suitable for negative vision modulation
∗ Applicable for IF frequencies of 38.9, 45.75 and 58.75 MHz
∗ Gain controlled wide-band Vision Intermediate Frequency (VIF)
amplifier (AC-coupled)
∗ True synchronous demodulation with active carrier
regeneration (ultra-linear demodulation, good intermodulation
figures, reduced harmonics and excellent pulse response)
∗ Peak sync pulse AGC
∗ Video amplifier to match sound trap and sound filter
∗ AGC output voltage for tuner with fixed resistor for takeover
point setting
APPLICATIONS
∗ AFC detector without extra reference circuit
∗ TV, VTR, PC and stb applications.
∗ Alignment-free FM-PLL detector with high linearity
∗ Stabilizer circuit for ripple rejection and to achieve constant
output signals
∗ 5 to 9 V positive supply voltage range
∗ Low power consumption of 300 mW at 5 V supply voltage.
ORDERING INFORMATION
Part No.
SA9801
Package
SOP-20-375-1.27
Marking
SA9801
HANGZHOU SILAN MICROELECTRONICS CO.,LTD
Http: //www.silan.com.cn
REV:1.0 2009.06.05
Page 1 of 7
1 page  
SA9801
3. Tuner AGC
The voltage on capacitor CAGC of SA9801 is transferred to an internal IF control signal, and is fed to the tuner
AGC to generate the tuner AGC output current on pin TAGC (open-collector output). The tuner AGC takeover
point level is set by pin TOP. This allows the tuner to be matched to the SAW filter in order to achieve the
optimum IF input level.
IF AGC gain control and tuner AGC output current as a function of the tuner AGC detector voltage.
4. AFC Circuit
The VCO of SA9801 operates with a symmetrically connected reference LC circuit, operating at the double vision
carrier frequency. Frequency control is performed by an internal variable capacitor diode.
The voltage to set the VCO frequency to the actual double vision carrier frequency is also amplified and
converted for the AFC output current.
VCC=5V
VCC=5V
VCC=9V
VCC=9V
SA9801
AFC
15
IAFC
22K
VAFC
22K
SA9801
AFC
15
IAFC
62K
VAFC
62K
5
3.75
2.5
1.25
0
38.3
38.6
225
(source current)
150
75
0
(sink current) -75
-150
38.9
f(MHz)
39.2
-225
39.5
9
7.5
6
4.5
3
1.5
0
38.3
38.6
150
(source current)
100
50
0
(sink current)
-50
-100
38.9
f(MHz)
39.2
-150
39.5
a. VCC=5V
b. VCC=9V
AFC measurement conditions and typical characteristics.
HANGZHOU SILAN MICROELECTRONICS CO.,LTD
Http: //www.silan.com.cn
REV:1.0 2009.06.05
Page 5 of 7
5 Page | ||
| Páginas | Total 7 Páginas | |
| PDF Descargar | [ Datasheet SA9801.PDF ] | |
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