UAA1570HL View Datasheet(PDF) - Philips Electronics
Part Name
Description
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UAA1570HL Datasheet PDF : 76 Pages
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Philips Semiconductors
Global Positioning System (GPS) front-end
receiver circuit
Product specification
UAA1570HL
SYMBOL
IF1N
VCCA(MX2)
MX2GND
IF2INN
IF2INP
STROBE
IF2P
IF2N
LIMGND
BFCN
LIMINN
PIN VOLTAGE
PIN TYPICAL VALUES (V)
VCC = 2.7 V VCC = 5 V
18 2.7
5
19 2.7
5
20 0
0
21 0.983
0.98
22 0.983
0.98
23 CMOS level CMOS level
24 2.7
5
25 2.7
5
26 0
27 1.696
0
3.999
28 1.696
3.999
DESCRIPTION
RF mixer IF negative output: DC couple this output pin to the
VCCA(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 VCC
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 VCCA(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 VCCA(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 VCCA(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 VCCA(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
VCCA(LIM) supply on pin 31. No DC coupling.
1999 May 10
7
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