參數(shù)資料
型號(hào)： UAA1570HL
廠(chǎng)商： NXP SEMICONDUCTORS
元件分類(lèi)： 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(yè)數(shù)： 7/76頁(yè)
文件大?。?/td> 890K
代理商： UAA1570HL
1999 May 10
7
Philips Semiconductors
Product specification
Global Positioning System (GPS) front-end
receiver circuit
UAA1570HL
IF1N
18
2.7
5
RF mixer IF negative output:
DC couple this output pin to the
V
CCA(MX1P)
supply through first IF filter inductors or RF chokes.
Capacitively decouple the supply near the output inductors.
Balanced first mixer IF1 outputs are recommended. Prevent
externally squared reference harmonics from entering the first IF
signal path or components.
IF mixer power supply:
if present, decouple the common V
CC
line sourcing the first and second mixer by placing a large
decoupling capacitor between the two
IF mixer ground:
minimize IF ground inductance; use close
proximity IF decoupling to the V
CCA(MX2)
supply pin 19
IF mixer negative input:
use external AC coupling. Balanced
IF1 second mixer inputs are recommended. Prevent externally
squared reference harmonics from entering the first IF signal
path or components.
IF mixer positive input:
use external AC coupling. Balanced
IF1 second mixer inputs are recommended. Prevent externally
squared reference harmonics from entering the first IF signal
path or components.
Serial interface strobe input:
a LOW level on this DC-coupled
CMOS
STROBE
input enables the
CLOCK
input to load the
20-bit programming word into the synthesizer input
DATA
register. A mandatory DC short-circuit to ground is required to
ensure that the default frequency plan is invoked on power-up.
IF mixer second IF positive output:
DC couple this output pin
to the V
CCA(MX2)
supply through second IF filter inductors or RF
chokes. Capacitively decouple the supply near the output
inductors. Balanced second mixer IF2 outputs are optional for
many applications. Short the unused IF2P or IF2N output directly
to the supply in single-ended applications.
IF mixer second IF negative output:
DC couple this output pin
to the V
CCA(MX2)
supply through second IF filter inductors or RF
chokes. Capacitively decouple the supply near the output
inductors. Balanced second mixer IF2 outputs are optional for
many applications. Short the unused IF2P or IF2N output directly
to the supply in single-ended applications.
Limiter ground:
minimize ground inductance
Negative limiter input DC feedback loop decoupling:
AC couple this pin to ground in close proximity to the pin.
The DC voltage is approximately 1 V below the V
CCA(LIM)
supply
on pin 31.
No DC coupling.
Negative limiter input:
AC couple this pin to the second IF filter
output or to ground if unused with single-ended filter
applications. The DC voltage is approximately 1 V below the
V
CCA(LIM)
supply on pin 31.
No DC coupling.
V
CCA(MX2)
19
2.7
5
MX2GND
20
0
0
IF2INN
21
0.983
0.98
IF2INP
22
0.983
0.98
STROBE
23
CMOS level
CMOS level
IF2P
24
2.7
5
IF2N
25
2.7
5
LIMGND
BFCN
26
27
0
1.696
0
3.999
LIMINN
28
1.696
3.999
SYMBOL
PIN
PIN VOLTAGE
TYPICAL VALUES (V)
DESCRIPTION
V
CC
= 2.7 V
V
CC
= 5 V
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