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11-191
RF2926
Rev A5 010404
11
Pin Out
Pin
Function
Description
Interface Schematic
46
LVL ADJ
This pin is used to vary the transmitter output power. An output level
adjustment range greater than 12dB is provided through analog voltage
control of this pin. DC current of the transmitter power amp is also
reduced with output power. This pin MUST be low when the transmitter
is disabled.
47
PLL ENABL This pin is used to power up or down the VCO and PLL. A logic high
(PLL ENABL>2.0V) powers up the VCO and PLL electronics. A logic
low (PLL ENABL<1.0V) powers down the PLL and VCO.
48
RX ENABL
Enable pin for the receiver circuits. RX ENABL>2.0V powers up all
receiver functions. RX ENABL<1.0V turns off all receiver functions
except the PLL functions and the RF mixer.
400
4k
Ω
LVL ADJ
40 k
Ω
50 k
Ω
PLL ENABL
50 k
Ω
RX ENABL
RSSI
Gain
Control
36
35
34
33
32
31
30
29
28
27
26
25
LO-
VCO OUT
MODIN
GND4
VCC2
RESNTR-
RESNTR+
VCC4
DEMOD IN
DATA REF
FM OUT
RSSI
48
45
46
47
44
43
42
41
40
39
38
37
1
2
3
4
5
6
7
8
9
10
11
12
TX ENABL
TX OUT
GND2
RX IN
GND1
LNA GND
LNA GND
LNA OUT
GND3
MIX IN
GND5
MIX OUT+
13
16
15
14
17
18
19
20
21
22
23
24
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