TDA8722 Philips Semiconductors, TDA8722 Datasheet - Page 4

• Manufacturer Part Number: TDA8722
• Description: I2C-bus programmable modulator for negative video modulation and FM sound
• Manufacturer: Philips Semiconductors

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