TDA8261TW Philips Semiconductors, TDA8261TW Datasheet - Page 4

• Manufacturer Part Number: TDA8261TW
• Description: Satellite Zero-IF QPSK/8PSK downconverter with PLL synthesizer
• Manufacturer: Philips Semiconductors

Philips Semiconductors
BLOCK DIAGRAM
2004 Dec 02
handbook, full pagewidth
Satellite Zero-IF QPSK/8PSK
downconverter with PLL synthesizer
V CC(VCO)
V CC(PLL)
VCOGND
RFGND1
V CC(RF)
PLLGND
SDA
RFA
RFB
BVS
TKA
TKB
SCL
XT1
XT2
AS
RFGND2
9
10
7
8
22
25
24
23
1
2
4
3
31
30
29
26
11
OSCILLATOR
VCO
I
2
C-BUS
BIASN1
6
COMPARATOR
DIVIDE-BY-4
FAST PHASE/
FREQUENCY
f XTAL
BIASN2
18
Fig.1 Block diagram.
REFERENCE
CONTROL LOGIC
DIVIDER
AND LATCH
BBGND1
13
15-BIT DIVIDER
4
CONTROL
V CC(BB)
f COMP
f DIV
AGC
15
Q
DIGITAL PHASE
CHARGE PUMP
COMPARATOR
IOUT
21
I
QOUT
integrated
oscillator
12
POWER-ON
QBBIN
RESET
TDA8261TW
14
IBBIN
19
BBGND2
33 V
AMP
20
MBL859
16
28
27
32
17
TDA8261TW
5
Product specification
IBBOUT
QBBOUT
AGCIN
CP
VT
XTOUT