PT9120_10 Datasheet, PDF (4/12 Pages) Princeton Technology Corp – GPS Receiver RF Front End IC

PIN DESCRIPTION
Pin Name
SGN
MAG
AOK
CP
DVSS
DVDD
XEN
XO
XI
VB
PLL
AON
LNI
ISNS
PVDD
LNO
AVDD
AVSS
RFIN
VBG
IF1P
IF1N
IF2P
IF2N
MODE
AGC
P1
P0
I/O
Description
O Quantized 2nd IF “sign” bit
O Quantized 2nd IF “magnitude” bit
O
Active antenna status output (AOK = HIGH = active antenna OK;
AOK=LOW=active antenna either open or shorted)
I/O Reference clock input/output
G Ground (digital circuitry)
P Supply voltage (digital circuitry)
I
Crystal oscillator enable pin
(XEN=HIGH=enabled; XEN=LOW=disabled)
O Crystal oscillator output
I Crystal oscillator input
O Regulator (1.9V) output
O Charge pump output
O Antenna switch-controlled supply voltage to active antenna
I LNA input
I Antenna detector current sense input
O Supply voltage (active antenna)
O LNA output
P Supply voltage (analog circuitry)
G Ground (analog circuitry)
I Mixer input
O Band gap reference (1.23V) output
O
O
Differential mixer IF output/differential first-stage IF amplifier input
I
I
Differential first-stage IF amplifier output/differential IF AGC input
I Reference frequency mode select input
I/O AGC capacitor connection. Sets the AGC time constant.
I
I
Power-down control pins (see PT9120 operating modes)
PT9120
Pin No.
28-pin 24-pin
1
1
2
2
3
-
4
3
5
4
6
5
7
6
8
7
9
-
10
8
11
9
12
10
13
11
14
12
15
13
16
14
17
15
18
16
19
17
20
18
21
19
22
20
23
21
24
22
25
-
26
23
27
24
28
-
PRE1.3
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