uaa1570hl NXP Semiconductors, uaa1570hl Datasheet - Page 7

• Manufacturer Part Number: uaa1570hl
• Description: Global Positioning System Gps Front-end Receiver Circuit
• Manufacturer: NXP Semiconductors

Philips Semiconductors
1999 May 10
IF1N
V
MX2GND
IF2INN
IF2INP
STROBE
IF2P
IF2N
LIMGND
BFCN
LIMINN
CCA(MX2)
Global Positioning System (GPS) front-end
receiver circuit
SYMBOL
PIN
18
19
20
21
22
23
24
25
26
27
28
2.7
2.7
0
0.983
0.983
CMOS level
2.7
2.7
0
1.696
1.696
V
CC
TYPICAL VALUES (V)
= 2.7 V
PIN VOLTAGE
5
5
0
0.98
0.98
CMOS level
5
5
0
3.999
3.999
V
CC
= 5 V
RF mixer IF negative output: DC couple this output pin to the
V
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
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
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
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
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
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(MX1P)
CCA(LIM)
7
CCA(MX2)
CCA(MX2)
supply on pin 31. No DC coupling.
supply through first IF filter inductors or RF chokes.
supply through second IF filter inductors or RF
supply through second IF filter inductors or RF
DESCRIPTION
CCA(MX2)
supply pin 19
UAA1570HL
Product specification
CCA(LIM)
supply
CC