HFA3524IA96 INTERSIL [Intersil Corporation], HFA3524IA96 Datasheet - Page 13

• Manufacturer Part Number: HFA3524IA96
• Description: 2.5GHz/600MHz Dual Frequency Synthesizer
• Manufacturer: INTERSIL [Intersil Corporation]

Typical Application Example
NOTES:
Typical Locked Detect Circuit
A lock detect circuit is needed in order to provide a steady
LOW signal when the PLL is in the locked state. A typical cir-
cuit is shown in Figure 20.
28. VCO is assumed AC coupled.
29. R
30. 50 termination is often used on test boards to allow use of external reference oscillator. For most typical products a CMOS clock is used and
31. Proper use of grounds and bypass capacitors is essential to achieve a high level of performance. Crosstalk between pins can be reduced by
32. This is a static sensitive device. It should be handled only at static free work stations.
the VCO power level. f
no terminating resistor is required. OSC
bias (see Figure 16).
careful board layout.
IN
increases impedance so that VCO output power is provided to the load rather than the PLL. Typical values are 10 to 200 depending on
100pF
V
0.01 F
CC
OSC
100pF
IN
0.01 F
V
P
IN
FIGURE 19.
RF impedance ranges from 40 to 100 . f
20
100pF
1
0.01 F
0.01 F
13
V
V
V
CC
100k
CC
CC
19
2
V
V
V
P
P
P
IN
18
3
100pF
may be AC or DC coupled. AC coupling is recommended because the input circuit provides its own
D
C3
D
O
O
RF
IF
17
4
GND
GND
C1
R2
C4
16
5
HFA3524
f
f
IN
R
(NOTE 29)
IN
IN
RF
HFA3524
(NOTE 28)
IF
R1
C2
FIGURE 18.
15
6
VCO
R
f
100pF
f
100pF
IN
IN
IN
(NOTE 28)
IN
RF
(NOTE 29)
IF
VCO
IF impedances are higher.
14
7
GND
GND
LD
13
8
OSC
LE
100pF
IN
12
9
51
(NOTE 30)
10pF
GND
DATA
33K
CRYSTAL OSCILLATOR
INPUT
11
10
100K
CLOCK
F
10pF
O
/LD
IF OUT
FIGURE 20.
0.01 F
F
O
/LD
RF OUT
V
CC
FROM
CONTROLLER
MMBT200
10K
LOCK
DETECT