U2745B Datasheet, PDF (7/9 Pages) ATMEL Corporation – UHF ASK TRANSMITTER

U2745B
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.
Frequency range of the VCO
Clock output
(CMOS microcontroller compatible)
f_VCO
Clk_out
310
440
f_out/128
Load capacitance at CLK
C_CLK
10
Series resonance R of the crystal
f_XTO = 13.56 MHz
f_XTO = 9.84 MHz
Rs
Rs
80
100
ASK modulation frequency rate
Duty cycle of the
modulation signal = 50%
f_modASK
0
20
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
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
150
I_ol
200
I_oh
-150
I_oh
-200
100
V_ASKl
0.3
V_ASKh
1.7
I_ASKh
140
V_EN
V_FSKl
0.3
V_FSKh
1.7
I_FSKh
140
Unit
MHz
MHz
pF
W
kHz
µA
µA
µA
µA
V
V
µA
V
V
µA
7
4734A–RKE–11/03