TDA8822 Datasheet, PDF (4/28 Pages) NXP Semiconductors – Universal I2C-bus programmable RF modulator

Philips Semiconductors
Universal I²C-bus programmable RF
modulator
BLOCK DIAGRAM
Preliminary specification
TDA8822
handbook, full pagewidth
VIDEO
24
CLAMP
21
NICAM
NICAM
AMP.
TPSG
VIDEO
AMP.
CLIP
MD setting
AGND
23
SWITCH
VCCA
1
VOLTAGE
REGULATOR
TPSG
ON/OFF
ADDER
RFA RFB
19 18
OUTPUT
BUFFER
MIXER
20
RFGND
22
AUDIO
3
PREEMPH
2
ACP
14
SCL
15
SDA
16
P0
17
TPSG
AUDIO
AMP.
DEV
setting
VCO
SND-IF
AMP.
PS
setting
sound oscillator
ON/OFF
test
AUDIO
CHARGE
PUMP
test
AUDIO
PHASE
DETECTOR
frequency
setting
I²C-BUS
RECEIVER
AND
LOGIC
I²C-bus control
fdiv(audio)
fdiv(video)
in-lock flag
fref(video)
fref(audio)
11
13
VCCD DGND
TDA8822
PROG.
DIVIDER
14 BITS
PROG.
DIVIDER
test
VIDEO
PHASE
DETECTOR
RF oscillator
ON/OFF
4
RFOSCA
frequency
setting
PRESCALER
DIVIDE-BY-8
RF
OSCILLATOR
5
RFOSCB
6
OGND
7
RFOSCC
8
RFOSCD
10
VCP
test
VIDEO
CHARGE
PUMP
test
LOOP
AMP.
9
VVT
REFERENCE
DIVIDER
CRYSTAL
OSCILLATOR
12
XTAL
MGE674
1997 Jan 08
Fig.1 Block diagram.
4