TDA8722 Datasheet, PDF (4/28 Pages) NXP Semiconductors – I2C-bus programmable modulator for negative video modulation and FM sound

Philips Semiconductors
I²C-bus programmable modulator for
negative video modulation and FM sound
BLOCK DIAGRAM
Product specification
TDA8722
handbook, full pagewidth
1
AUDIO
2
SOSCA
3
SOSCB
13
SDA
12
SCL
14
P0
VIDEO
19
CLAMP
CLIP
ADJUST
17
TDA8722
VIDEO AMP
AGND ^VDDA
18
20
VOLTAGE
REGULATOR
RFA RFB
16
15
ASYMMETRICAL
OUTPUT
BUFFER
AUDIO
FM MODULATOR
I ²C-BUS
RECEIVER
TPSG
SWITCH
TPSG on
balance test
12-BIT
DIVIDER
(N)
10 bits
PRESCALER
(8)
MIXER
PC
UHF
OSCILLATOR
6 _UOSCA
5 _OGND
4 _UOSCB
enable/
select
LOGIC
f _DIV
f _ref
RF oscillator on
8
CP
PHASE
DETECTOR
CHARGE
PUMP
AMP
7
AMP
enable
11
VDDD
10
DGND
31.25 kHz
DIVIDER
(M = 128)
4 MHz
OSCILLATOR
9
XTAL
MBE401
Fig.1 Block diagram.
1998 Jun 23
4