TDA9809 Philips Semiconductors, TDA9809 Datasheet - Page 5

• Manufacturer Part Number: TDA9809
• Description: Single standard multimedia IF-PLL and FM radio demodulator
• Manufacturer: Philips Semiconductors

Philips Semiconductors
PINNING
FUNCTIONAL DESCRIPTION
The TDA9809M is comprised of the functional blocks
shown in Fig.1:
1998 Jan 08
V
V
LP0
V
C
T
V
LP2
C
V
V
TAGC
V
AFC
VCO1
VCO2
GND
CERRES
V
TADJ
SYMBOL
PLL
iVIF1
iVIF2
iRIF
oAF
o(int)
iFM
o(vid)
P
Vision IF amplifier and AGC detector
Tuner (TV/radio) and VIF AGC
Frequency Phase-Locked Loop (FPLL) detector
VCO, Travelling Wave Divider (TWD) and TV AFC
Video demodulator and amplifier
Intercarrier mixer
RIF amplifier and AGC detector
FM-PLL demodulator, level detector and radio AFC
Audio Frequency (AF) signal processing
Internal voltage stabilizer
Logic.
VAGC
DEC
Single standard multimedia IF-PLL and FM
radio demodulator
PIN
10
12
13
14
15
16
17
18
19
20
11
1
2
3
4
5
6
7
8
9
VIF differential input signal voltage 1
VIF differential input signal voltage 2
logic port 0
RIF input
VIF AGC capacitor
PLL loop filter
audio output
logic port 2 and soft mute threshold
adjustment
decoupling capacitor
intercarrier output voltage
sound intercarrier input voltage
TV/radio tuner AGC output
composite video output voltage
AFC/RIF level output
VCO1 resonance circuit
VCO2 resonance circuit
ground
ceramic resonator 10.7 MHz
supply voltage
tuner AGC takeover point adjustment
DESCRIPTION
5
Vision IF amplifier and AGC detector
The vision IF amplifier contains three AC-coupled
differential amplifier stages. Each differential stage
includes a feedback network controlled by emitter
degeneration.
The AGC detector generates the required VIF gain control
voltage for constant video output by charging/discharging
the AGC capacitor. The sync level of the video signal is
therefore detected for negative video modulation.
Tuner (TV/radio) and VIF AGC
For TV operation, the AGC capacitor voltage is converted
to an internal IF control signal and then fed to the tuner
AGC to generate the tuner AGC output current at
pin TAGC (open-collector output). The tuner AGC
takeover point can be adjusted at pin TADJ. This allows
the tuner to be matched to the SAW filter in order to
achieve the optimum IF input level.
For FM radio operation, an AGC detector is provided to
obtain some adjacent channel protection.
handbook, halfpage
C VAGC
V iVIF1
V iVIF2
V o(int)
C DEC
V iRIF
V oAF
T PLL
LP0
LP2
Fig.2 Pin configuration.
10
1
2
3
4
5
6
7
8
9
TDA9809M
MHA958
Preliminary specification
15
14
13
12
19
18
17
16
11
20
TDA9809M
TADJ
V P
CERRES
GND
VCO2
VCO1
AFC
V o(vid)
TAGC
V iFM