PT9120 Datasheet, PDF (5/18 Pages) Princeton Technology Corp – GPS Receiver RF Front End IC

GPS Receiver RF Front End IC
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URL: http://www.princeton.com.tw
Preliminary
PT9120
PIN DESCRIPTION
Pin Name I/O
Description
Pin No.
28-pin 24-pin
SGN O Quantized 2nd IF “sign” bit
1
1
MAG O Quantized 2nd IF “magnitude” bit
2
2
AOK
O
Active antenna status output (AOK = HIGH = active antenna OK;
AOK=LOW=active antenna either open or shorted)
3
-
CP I/O Reference clock input/output
4
3
TVSS G Ground (digital circuitry)
5
4
TVDD P Supply voltage (digital circuitry)
6
5
XEN
I
Crystal oscillator enable pin
(XEN=HIGH=enabled; XEN=LOW=disabled)
7
6
XI
I Crystal oscillator input
8
7
XO
O Crystal oscillator output
9
-
VB
O Regulator (1.9V) output
10
8
PLL
O Charge pump output
11
9
AON O Antenna switch-controlled supply voltage to active antenna
12
10
LNI
I LNA input
13
11
ISNS
I Antenna detector current sense input
14
12
PVDD O Supply voltage (active antenna)
15
13
LNO O LNA output
16
14
AVDD P Supply voltage (analog circuitry)
17
15
AVSS G Ground (analog circuitry)
18
16
RFIN
I Mixer input
19
17
VBG O Band gap reference (1.23V) output
20
18
IF1P O Differential mixer IF output/differential first-stage IF amplifier
21
19
IF1N O input
22
20
IF2P
I Differential first-stage IF amplifier output/differential IF AGC
23
21
IF2N
I input
24
22
MODE I Reference frequency mode select input
25
-
AGCCAP I/O AGC capacitor connection. Sets the AGC time constant.
26
23
P1
P0
I
I
Power-down control pins (see PT9120 operating modes)
27
24
28
-
PT9120 PRE1.0
-5-
August, 2007