U2731B Datasheet, PDF (2/25 Pages) ATMEL Corporation – DAB ONE- CHIP FRONT END

Figure 1. Block Diagram
SAW1 SAW2
18
19
IFIN1 IFIN2 CPIF
24
23
28
16
CPRF
th2
12
RFA1
13
RFA2
14
RFB1
15
RFB2
C1VCO
32
33
B2VCO
34
B1VCO ₃₅
C2VCO
VCO
th1
V _AGC
V _AGC
1/ 2
x1/x2
D/A
D/A
D/A
4-bit latch
4-bit latch
4-bit latch
4-bit latch
26 ^IF
AGCIN2
27
IF
th3
AGCIN1
21
SLI
22
WAGC
29
IFOUT
20, 25, 38
VS
10, 11, 17, 30, 31,36, 37
GND
42
OSCI
43
OSCO
5
FREF
Reference
counter
Tristate
phase
detector
Lock
detector
Programmable
charge pump
41
PLCK
39
PD
40
VD
Fractional-N
control
Programmable
13-bit counter
N/N+1
9-bit latch
15-bit latch
4-bit latch
3-bit latch
8-bit latch
8-bit latch
8-bit latch
MUX MUX
Simple two-wire bus interface/control
Switches
D/A
D/A
D/A
44
ADR
1
SCL
2
SDA
3
6
4
SWA SWC SWB
7
CAO
8
CCO
9
CBO
2 U2731B
4671C–DAB–06/04