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PDF UAA1570HL Data sheet ( Hoja de datos )
| Número de pieza | UAA1570HL | |
| Descripción | Global Positioning System GPS front-end receiver circuit | |
| Fabricantes | Philips | |
| Logotipo |  |
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INTEGRATED CIRCUITS
DATA SHEET
UAA1570HL
Global Positioning System (GPS)
front-end receiver circuit
Product specification
File under Integrated Circuits, IC18
1999 May 10
1 page  
Philips Semiconductors
Global Positioning System (GPS) front-end
receiver circuit
5 BLOCK DIAGRAM
Product specification
UAA1570HL
handbook, full pagewidth
48 47 46 45 44 43
42 41
40
39 38
37
VCCA(LNA2)
LNA2GND1
LNA2IN
BIASGND2
LNA2GND2
LNA2OUT
CLOCK
1
2
3
4 LNA2
5
6
7
to data register
LNA1
UAA1570HL
DIVIDE-BY-1 or 2
PHASE
FREQUENCY
DETECTOR
DIVIDE-BY-1 or 2
DIVIDE-BY-2
DIVIDE-BY-N(1)
(64 to 127)
SQUARING
CIRCUIT
36
VCCA(PLL)
35
DGND
33 VDDD
31
VCCA(LIM)
DATA REGISTER 32
FOR
DATA
PROGRAMMING
8
REFIN
SQUARING
CIRCUIT
DIVIDE-BY-R(1)
(4 to 31)
DIVIDE-BY-3
VCCA(VCO)
TANK
VCOGND
9
10
11
VCO
12
P12GND
MIXER 1
DIVIDE-BY-2
DIVIDE-BY-L(1)
(4 to 15)
to data
register
DIVIDE-BY-2
MIXER 2
QUANTIZER
34
SIGN
30
BFCP
29
LIMINP
28
LIMINN
27
BFCN
26
LIMGND
25
IF2N
13 14 15 16 17 18 23 19 20 21 22 24
MHB269
Shaded blocks are NOT active during synthesizer state.
(1) The default values are: L = 10, N = 71 and R = 4.
Fig.1 Block diagram.
1999 May 10
5
5 Page 
Philips Semiconductors
Global Positioning System (GPS) front-end
receiver circuit
Product specification
UAA1570HL
7 FUNCTIONAL DESCRIPTION
The programmability of the UAA1570HL and flexible
interface definitions allow the device to be configured for a
wide range of applications. To restrict the content of this
document the functional description of the device will
generally concentrate on the C/A-code application circuit
based on the default frequency plan.
The application circuit does not allow easy measurement,
calibration and documentation of the many sub-block
characteristics which ensure good system performance.
Therefore, test boards have been developed which allow
direct measurement of the sub-block characteristics.
The tables and graphs reflect the UAA1570HL
specification as derived from simulation and measured
results in these characterization board environments.
The tables and graphs do not directly specify application
board expectations. The functional description however,
focuses on the default application.
The RF system diagram (see Fig.3) illustrates the default
application of the UAA1570HL in the Philips GPS
demonstration board. In this application the UAA1570HL is
intended to be operated directly from a passive GPS
antenna through a very short antenna cable. Any cable
loss in this demonstrator adds directly to the system noise
figure and should therefore be minimized.
LNA1 can be powered down in the UAA1570HL to
accommodate applications built around external LNAs,
typically where long antenna cable runs are required.
The first LNA is assumed to be matched with a 2nd-order
band-pass structure to provide some input selectivity,
since no dielectric or SAW filter has been used in the
demonstration board. It should be noted that low loss RF
SAW filters now make it possible to significantly improve
the jam immunity of this amplifier, by placing a SAW filter
at the output of the antenna.
On the demonstration board the first LNA is followed by a
low loss RF SAW filter (<2.4 dB).
On the demonstration board the second LNA has been
matched to 50 Ω using a simple transmission line
structure.
Finally, another identical RF SAW filter follows the second
LNA into the first mixer.
1999 May 10
11
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet UAA1570HL.PDF ] | |
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