GP2015
Vcc
VALUES FOR L1,L2,L3,L4 & L5 ARE
DEPENDENT ON FILTERS USED
L1
RF INPUT
MATCHING
Cs = 12pF
Cp = 2.7pF
Cs
RF
INPUT
32
Cp
33, 34,
30,31
23
Cagc
=0.1uF
24
17
16
11
15
14
21
9
8
20
37 38
L2
L3
L4
175MHz
FILTER
SAW
FILTER
L5
Vcc
Creg = 0.1uF
(Vcc = +5.0V only)
40 41
44 45
47 48
4, 6
27
2
3
GP2015 FRONT-END
48 PIN
REF2
10MHz I/P
C1
R1
PLL LOOP
FILTER
C1 = 0.47uF
R1 = 270Ω
C2 = 10nF
C2
Vcc
R4
R5
R6
POWER-ON REF
R4, R5 = 470Ω
R6 = 1.5kΩ
R3
70
CLK_T
R2
71
CLK_I
73
SAMP CLK
76
SIGN 0
77
MAG 0
66
PLL LOCK
2
POWER_GOOD
POWER-ON
REF
LADDER
R3 =2.7k
R2 = 2.7k (Vcc = +3.0V)
= 6.8k (Vcc = +5.0V)
GP2021 CORRELATOR
80 PIN
Figure 4 - GP2015 typical application
Ref 2
(27)
GP2015
(28)
Ref 1
33pF
10.000MHz
CRYSTAL
22pF
Figure 5 - Crystal Reference connections
10