參數(shù)資料
型號(hào)： GP2010
廠商： Mitel Networks Corporation
英文描述： GPS Receiver RF Front End
中文描述： GPS接收機(jī)射頻前端
文件頁(yè)數(shù)： 22/24頁(yè)
文件大?。?/td> 151K
代理商： GP2010
GP2010
7
Pin No.
Signal Name
Input/Output
Description
17
PDn
Input
Power-Down control input.
A TTL compatible input, which when set to logic high, will
disable ALL of the GP2010 functions, except the power-on
reset block. Useful to reduce the total power consumption of
the GP2010. If this feature is not required, the pin should be
connected to 0V (VEE/GND).
18
TEST
Input
Test control input - Disable PLL.
A TTL compatible input, which when set to logic high, will
disable the on-chip PLL, by disconnecting the divided-down
VCO signal to the phase-detector. The VCO will free run at its
upper range of frequency operation. If this feature is not
required, the pin should be connected to 0V (VEE/GND).
19
LD
Output
PLL Lock Detect output.
A TTL compatible output, which indicates if the PLL is phase-
locked to the PLL reference oscillator. Will become logic high
only when phase-lock is achieved.
20
VEE (DIG)
Input
Negative supply to the PLL and A to D converter.
21
AGC-
Output
AGC Capacitor output - inverse phase.
One side of a balanced output from the AGC block within IF
Stage 3, to which an external capacitor is connected to set the
AGC time-constant.
22
AGC+
Output
AGC Capacitor output - true phase.
One side of a balanced output from the AGC block within IF
Stage 3, to which an external capacitor is connected to set the
AGC time-constant.
23
VCC (DIG)
Input
Positive supply to the PLL and A to D converter.
24
REF 2
Input
10.000MHz PLL Reference signal input .
Input to which an externally generated 10.000MHz PLL
reference signal should be ac coupled, if an external PLL
reference frequency source (e.g TCXO) is used (see fig. 6).
If no external reference is used, this pin forms part of the on-
chip PLL reference oscillator, in conjunction with an external
10.000MHz crystal (see fig. 5).
25
REF 1
Input
PLL reference oscillator auxillary connection.
Used in conjunction with Pin 24 (REF 2) to allow a 10.000MHz
external crystal to provide the PLL reference signal if no
external PLL reference frequency source (e.g TCXO) is used.
This pin should NOT be connected if an external TCXO is
being used (see fig. 5).
26, 32
VCC (RF)
Input
Positive supply to the RF input and Stage 1 IF mixer.
Both pins 26 & 32 (VCC (RF)) are connected internally, but
must both be connected to VCC externally, to keep series
inductance to a minimum.
27, 28,
VEE (RF)
Input
Negative supply to the RF input and Stage 1 IF mixer.
30, 31
Pins 27, 28, 30 & 31 are all connected internally, but must ALL
be connected to 0V (VEE/GND) externally, to keep series
inductance to a minimum.
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