U2781B Datasheet, PDF (7/10 Pages) TEMIC Semiconductors – Frequency Synthesizer

U2781B
Typical Input Sensitivity
1000 _mVRMS
500 ^{( 50 Ohm)}
dBm ₊₁₀
( 50 Ohm)
+5
200
0
–5
100
– 10
50
– 15
20
– 20
– 25
10
– 30
5
– 35
2
– 40
1
.5
.2
.1
0
93 7789 e
– 45
– 50
– 55
– 60
– 65
200 ⁴⁰⁰
600
800
1000 ¹²⁰⁰
1600
1400
Frequency ( MHz )
Application Circuit
94 8905
Figure 6.
Enable
Data
Clock
alternatively to ¹⁰ⁿ
external TCXO
2 x 10p
V_SCP = 3 to 6 V
1m
V_S = 3 V
1m
U2781B
10k
10n
10n
Figure 7.
1n
LD
VCO
Tuning
voltage
Loop filter
TELEFUNKEN Semiconductors
Rev. A3, 26-Nov-97
7 (10)