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PDF CXA1951AQ Data sheet ( Hoja de datos )
| Número de pieza | CXA1951AQ | |
| Descripción | GPS Down Converter | |
| Fabricantes | Sony Corporation | |
| Logotipo |  |
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GPS Down Converter
CXA1951AQ
Description
The CXA1951AQ is an IC developed as a GPS
down converter, featuring low current consumption
and small package. This IC is suitable for the
mobile GPS (Global Positioning System).
40 pin QFP (Plastic)
Features
• Includes all functions required for the GPS converter
• Total gain: 100 dB or more
• Operating supply voltage range: 2.7 to 5.5 V
• Low current consumption:
ICC = 30 mA (Typ. at VCC = 3 V)
• Excellent temperature characteristics
Applications
GPS (Global Positioning System)
Structure
Bipolar silicon monolithic IC
Absolute Maximum Ratings (Ta = 25 °C)
• Supply voltage
VCC 7.0
• Operating temperature Topr –40 to +85
• Storage temperature Tstg –65 to +150
• Allowable power dissipation
PD 200
V
°C
°C
mW
Operating Conditions
Supply voltage
VCC
2.7 to 5.5
V
Sony reserves the right to change products and specifications without prior notice. This information does not convey any license by
any implication or otherwise under any patents or other right. Application circuits shown, if any, are typical examples illustrating the
operation of the devices. Sony cannot assume responsibility for any problems arising out of the use of these circuits.
—1—
E96743-TE
1 page  
Pin
Symbol Pinvoltage
No.
Equivalent circuit
VCC
CXA1951AQ
Description
31 LIM OUT
31 Limiter buffer output
32 LIM GND
0V
GND
High: 2.2 V
34 REF INV
Low: 2.0 V
VCC
39.6k
200
35
39.6k
35 REF IN
36 PLL GND
2.1 V
0V
37 FC
—
GND
VCC
81k
200
37
100k
100k
GND
VCC
200
34
Limiter buffer ground
Reference frequency
signal output.
The reference frequency
signal can also be made
by connecting this pin
and Pin 35 with a crystal
oscillator to configure an
oscillator.
Reference frequency
input and reference
counter input
PLL ground
Switching for the charge
pump output status and
for the signal output to
Pin 38
High: 2.2 V
38 TEST OUT
Low: 2.0 V
200
38
Output of the frequency
division signal by the
counter
GND
—5—
5 Page 
CXA1951AQ
Description of Operation
This IC down-converts the GPS (Global Positioning System) frequency of 1.57542 GHz to fo (fo: 1.023 MHz)
or 4fo.
The internal configuration is divided into the analog block, consisting of the amplifier and mixer, and the digital
block (including limiter), which forms the PLL.
The two-stage analog block has an external filter; it converts the frequency and amplifies the signal. The PLL
frequency division ratio can be switched in the digital block in order to down-convert the output signal to fo or
4fo.
1. Oscillator
Transistor and bias circuits are incorporated in this IC. A Colpitts or Hartley oscillator can be configured by
adding an external resonator. Also, the oscillator is a paired circuit so as to enable balanced output.
IC
67 89
Example of Colpitts Oscillator Configuration (one side)
IC
67 89
CP
Example of Balanced Configuration
A varactor (variable capacitance) diode, as shown by the dotted line, is added to this IC to configure a VCO,
and the resonant frequency is varied depending on the control voltage of Pin 2 (charge pump output) to CP.
—11—
11 Page | ||
| Páginas | Total 16 Páginas | |
| PDF Descargar | [ Datasheet CXA1951AQ.PDF ] | |
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