TDA9881 Philips Semiconductors, TDA9881 Datasheet - Page 4

• Manufacturer Part Number: TDA9881
• Description: Alignment-free vision and FM sound IF PLL demodulator
• Manufacturer: Philips Semiconductors

Fig 1. Block diagram.
VIF2
VIF1
SIF2
SIF1
Pin numbers for TDA9881HN in parenthesis.
2 (31)
1 (30)
24 (27)
23 (26)
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TUNER AGC
20 (22)
SUPPLY
V P
TOP
9 (8)
TAGC
14 (15)
18 (20)
AGND
C
AGC
VIF AGC
3 (1)
i.c.
SIF AGC
22 (24)
VAGC
SINGLE REFERENCE QSS MIXER
C
AGC
INTERCARRIER MIXER
VIF PLL
16 (17)
AMUTE0 VIF0
19 (21)
VPLL
VIF PLL
filter
RC VCO
13 (14)
LOGIC
11 (10)
FM0
DIGITAL VCO CONTROL
10 (9)
FM1
TDA9881
7 (5)
DGND
single reference
external reference signal
QSS output
or 4 MHz crystal
12 (11)
QSSO
15 (16)
REF
4.5 MHz to 6.5 MHz
FM PLL DEMODULATOR
AFC DETECTOR
SOUND TRAPS
NARROW-BAND
21 (23)
AUDIO PROCESSING
AFC
AND SWITCHES
FMPLL
4 (2)
FM PLL
filter
(18) 17
(7) 8
(3) 5
(4) 6
CVBS
FMSO
DEEM
AFD
mhc504
video output: 2 V (p-p)
de-emphasis
network
FM sound output
C
AF