GP2015
Pin No.
32
Signal Name
RF Input
Input/Output
Input
Description
RF input.
The GPS RF input signal @ 1575.42MHz from an external
antenna with LNA and filter is connected to this pin via an
input-matching network (see fig.4).
Not connected. (See Note 4)
Output
Stage 1 mixer output @ 175.42MHz - inverse phase.
One of a balanced output from first stage IF mixer, to which
one input of an external balanced 175MHz bandpass filter is
connected. External dc biasing is required via an inductor
connected to V
CC
(RF) - the value of which is dependent on the
filter used.
Stage 1 mixer output @ 175.42MHz - true phase.
Second of a balanced output from first stage IF mixer, to which
the second input of an external balanced 175MHz bandpass
filter is connected. External dc biasing is required via an
inductor connected to V
CC
(RF) - the value of which is dependent
on the filter used.
Positive supply to the Stage 2 IF mixer.
Stage 2 mixer input @ 175.42MHz - inverse phase.
One of a balanced input to the second stage IF mixer, to which
one of the balanced signal outputs from the external 175MHz
bandpass filter is connected.
Stage 2 mixer input @ 175.42MHz - true phase.
Second of a balanced input to the second stage IF mixer, to
which the second of the balanced signal outputs from the
external 175MHz bandpass filter is connected.
Negative supply to the Stage 2 IF mixer, and Stage 3 IF block.
Stage 2 mixer output @ 35.42MHz - inverse phase.
One of a balanced output from second stage IF mixer, to which
one input of an external balanced 35.42MHz bandpass filter is
connected. External dc biasing is required via an Inductor
connected to V
CC
. (See Note 3)
Stage 2 mixer output @ 35.42MHz - true phase.
Second of a balanced output from second stage IF mixer, to
which the second input of an external balanced 35.42MHz
bandpass filter is connected. External dc biasing is required
via an Inductor connected to V
CC
. (See Note 3)
Positive supply to the Stage 3 IF mixer.
Stage 3 mixer input @ 35.42MHz - inverse phase.
One of a balanced input to the third stage IF mixer, to which
one of the balanced signal outputs from the external 35.42MHz
bandpass filter is connected. (See Note 3)
Stage 3 mixer input @ 35.42MHz - true phase.
Second of a balanced input to the third stage IF mixer, to which
the second of the balanced signal outputs from the external
35.42MHz bandpass filter is connected. (See Note 3)
36
37
N/C
O/P 1-
38
O/P 1+
Output
39
40
V
CC
(2)
I/P 2-
Input
Input
41
I/P 2+
Input
42, 43
44
V
EE
(IF)
O/P 2-
Input
Output
45
O/P 2+
Output
46
47
V
CC
(3)
I/P 3-
Input
Input
48
I/P 3+
Input
8
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