參數(shù)資料
型號： UAA1570HL
廠商： NXP SEMICONDUCTORS
元件分類： 通信及網(wǎng)絡(luò)
英文描述： Global Positioning System (GPS)baseband processor(通用定位系統(tǒng)基帶處理器)
中文描述： SPECIALTY TELECOM CIRCUIT, PQFP48
封裝： PLASTIC, SOT-313, LQFP-48
文件頁數(shù)： 39/76頁
文件大?。?/td> 890K
代理商： UAA1570HL
1999 May 10
39
Philips Semiconductors
Product specification
Global Positioning System (GPS) front-end
receiver circuit
UAA1570HL
8
OPERATING MODE SELECTION TABLES
Table 3
Programmable operating modes
8.1
Manual selection operating modes
Some applications of the UAA1570HL may require the use of an external LNA. Since LNA1 is self contained and includes
independent bias circuitry, it can be powered down simply by not connecting the respective supply pin or tying it to
ground. Some considerations apply to optimize performance when using an external LNA. Generally the UAA1570HL
has been optimized with approximately 15 dB of gain in the first LNA. To prevent degradation of the system noise figure
or dynamic range in subsequent system functions, such as the first mixer or synthesizer, some limitations on the nominal
effective gain and noise figure of external devices should be taken into account. The following values are not specified,
since exceeding the recommended ranges may still result in adequate dynamic performance in some 1-bit GPS system
applications.
Note
: LNA2 has to be powered-up under all circumstances, i.e. its supply pin has to be connected to V
CC
under all
circumstances due to biasing constraints.
Table 4
Operation with external LNAs
Notes
1.
The maximum external noise figure listed is that which will produce approximately a 1 dB degradation in system
noise figure using the minimum recommended external gain. The maximum recommended external gain listed
results in approximately 1 dB compression in the second mixer input with an in-band continuous wave jammer
present (J/S = 35 dB) for nominal processed parts.
If a high gain external LNA is used, both LNA1 and LNA2 should be removed from the signal path. However, the
LNA2 supply pin has to be connected to V
CC
to retain power to the first mixer.
2.
MODE
p0
p1
LNA1
LNA2
VCO
MX1, MX2,
1-BIT
2nd LO
DPLL
Normal
Partial power-down
Undefined
Complete power-down
0
0
1
1
0
1
0
1
yes
no
no
yes
no
no
yes
yes
no
yes
no
no
yes
no
no
yes
yes
no
MODE
V
CC(LNA1)
V
CC(LNA2)
MAXIMUM
RECOMMENDED
EXTERNAL GAIN
INCLUDING
CABLE AND
FILTER LOSSES
MINIMUM
RECOMMENDED
EXTERNAL GAIN
INCLUDING
CABLE AND
FILTER LOSSES
MAXIMUM
RECOMMENDED
EXTERNAL
NOISE FIGURE
INCLUDING
CABLE AND
FILTER LOSSES
INTERNAL
CURRENT
REDUCTION
Normal
LNA1
replacement;
note 1
LNA1/LNA2
replacement;
notes 1 and 2
yes
no
yes
yes
10 dB
25 dB
3.5 dB
8 dB
3.5 dB
4 dB
6.5 mA
no
yes
41 dB
21 dB
4 dB
6.5 mA
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