U2731B Datasheet, PDF (4/25 Pages) ATMEL Corporation – DAB ONE- CHIP FRONT END

Pin Description
Pin
Symbol
1
SCL
2
SDA
3
SWA
4
SWB
5
FREF
6
SWC
7
CAO
8
CCO
9
CBO
10
GND
11
GND
12
RFA1
13
RFA2
14
RFB1
15
RFB2
16
CPRF
17
GND
18
SAW1
19
SAW2
20
VS
21
SLI
22
WAGC
23
IFIN2
24
IFIN1
25
VS
26
IFAGCIN2
27
IFAGCIN1
28
CPIF
29
IFOUT
30
GND
31
GND
32
C1VC
33
B2VCO
34
B1VCO
35
C2VC
36
GND
37
GND
38
VS
39
PD
40
VD
Function
Clock (simple two-wire bus)
Data (simple two-wire bus)
Switching output (open collector)
Switching output (open collector)
Reference frequency output (for U2731B)
Switching output (open collector)
Output of D/A converter A
Output of D/A converter B
Output of D/A converter C
Ground
Ground
Input 1 of RF amplifier A (differential)
Input 2 of RF amplifier A (differential)
Input 1 of RF amplifier B (differential)
Input 2 of RF amplifier B (differential)
Charge-pump output (RF AGC block)
Ground
SAW driver output 1 (differential)
SAW driver output 2 (differential)
Supply voltage RF part
AGC mode selection (charge-pump current high)
AGC mode selection (charge-pump current off)
Input 2 of IF amplifier (differential)
Input 1 of IF amplifier (differential)
Supply voltage IF part
Input 2 of IF AGC block (differential)
Input 1 of IF AGC block (differential)
Charge-pump output (IF AGC block)
IF output (single ended)
Ground
Ground
Collector 1 of VCO
Base 2 of VCO
Base 1 of VCO
Collector 2 of VCO
Ground
Ground
Supply voltage PLL
Tri-state charge pump output
Active filter output
4 U2731B
4671C–DAB–06/04