UAA1570HL 데이터 시트보기 (PDF) - Philips Electronics
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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
6 PINNING INFORMATION
SYMBOL
VCCA(LNA2)
LNA2GND1
LNA2IN
BIASGND2
LNA2GND2
LNA2OUT
CLOCK
REFIN
VCCA(VCO)
TANK
VCOGND
P12GND
MXPGND
MX1IN
MX1GND
VCCA(MX1P)
IF1P
PIN VOLTAGE
PIN TYPICAL VALUES (V)
VCC = 2.7 V VCC = 5 V
1 2.7
5
20
3 0.815
40
50
6 1.48
0
0.807
0
0
3.629
7 CMOS level CMOS level
8 1.69
3.99
9 2.7
5
10 1.92
1.92
11 0
0
12 0
0
13 0
0
14 0.82
0.81
15 0
0
16 2.7
5
17 2.7
5
DESCRIPTION
LNA2 power supply: DC operation range 2.7 to 5 V; use close
proximity RF decoupling to pins 2, 4 and 5
LNA2 ground 1: minimize RF ground inductance
LNA2 input: use external RF AC coupling
LNA2 bias circuit ground: minimize RF ground inductance
LNA2 ground 2: minimize RF ground inductance
LNA2 output: use external RF AC coupling. The DC voltage is
approximately 1.3 V below the VCCA(LNA2) supply on pin 1.
Serial interface clock input: this DC coupled CMOS CLOCK
input moves 20-bit programming words into the synthesizer
DATA input register while the STROBE is LOW. A DC
short-circuit to ground is recommended with the default
frequency plan.
Reference input: use external AC coupling. The DC voltage is
approximately 1 V below the VCCA(PLL) supply on pin 36.
VCO power supply: DC operation range 2.7 to 5 V; use critical
close proximity RF decoupling to pin 11
VCO negative impedance resonator port: use the absolute
minimum trace lengths and widths and keep the loop to the VCO
ground pin 11 as short as possible, while centring the COMP
output voltage at pin 40 within the charge pump output voltage
range given in Chapter 11 by adjusting the resonator inductance
and/or required AC coupling component.
VCO ground: minimize RF ground inductance; use critical
close proximity RF decoupling to VCO supply pin 9
this pin provides additional RF shielding and has to be
connected to ground
RF mixer preamplifier ground: minimize RF ground inductance
RF mixer preamplifier input: use external AC coupling and RF
matching
RF mixer ground: minimize RF ground inductance; use critical
close proximity RF decoupling to VCCA(MX1P) supply pin 16
RF preamplifier/mixer power supply: DC operation range
2.7 to 5 V; use critical close proximity RF decoupling to pin 15
RF mixer IF positive 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.
1999 May 10
6
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