Rainbow Electronics U2745B - Manual (Page 7)

7
U2745B
4734A–RKE–11/03
Frequency range of the VCO f
VCO
310 440 MHz
Clock output
(CMOS microcontroller compatible)
Clk
out
f
out
/128 MHz
Load capacitance at CLK C
CLK
10 pF
Series resonance R of the crystal
f
XTO
= 13.56 MHz
f
XTO
= 9.84 MHz
Rs
Rs 80
100
W
ASK modulation frequency rate
Duty cycle of the
modulation signal = 50%
f
modASK
0 20 kHz
CLK output
- Output current Low
- Output current Low
- Output current High
- Output current High
V
CLK
= 0.2 ´ V
S
V
CLK
= 0.3 ´ V
S
V
CLK
= 0.8
´
V
S
V
CLK
= 0.7 ´ V
S
I
ol
I
ol
I
oh
I
oh
150
200
-150
-200
100
µA
µA
µA
µA
ASK input
- Low level input voltage
- High level input voltage
- Input current High
V
ASKl
V
ASKh
I
ASKh
1.7
0.3
140
V
V
µA
Enable ASK
- Low level input voltage
- High level input voltage
- Input current High V
EN
V
FSKl
V
FSKh
I
FSKh
1.7
0.3
140
V
V
µA
Electrical Characteristics (Continued)
All parameters are refered to GND (pin 5), V
S
= 3 V, T
amb
= 25
°
C, unless otherwise specified
The possible operating ranges refer to different circuit conditions: V
S
= 2.2 V to 4.0 V at T
amb
= -40
°
C to +85
°
C
Parameters Test Conditions Symbol Min. Typ. Max. Unit