u2745b ATMEL Corporation, u2745b Datasheet - Page 7

• Manufacturer Part Number: u2745b
• Description: Uhf Ask Transmitter
• Manufacturer: ATMEL Corporation

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