U2745B-MFBG3
| Model | U2745B-MFBG3 |
| Description | UHF ASK TRANSMITTER |
| PDF file | Total 9 pages (File size: 187K) |
| Chip Manufacturer | ATMEL |
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.
Unit
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
f
XTO
= 13.56 MHz
f
XTO
= 9.84 MHz
Duty cycle of the
modulation signal = 50%
V
CLK
= 0.2
´
V
S
V
CLK
= 0.3
´
V
S
V
CLK
= 0.8
´
V
S
V
CLK
= 0.7
´
V
S
f
VCO
Clk
out
C
CLK
Rs
Rs
f
modASK
I
ol
I
ol
I
oh
I
oh
V
ASKl
V
ASKh
I
ASKh
V
EN
V
FSKl
V
FSKh
I
FSKh
310
f
out
/128
440
MHz
MHz
10
80
100
0
20
pF
W
kHz
150
200
-150
-200
100
0.3
µA
µA
µA
µA
V
V
µA
V
V
µA
1.7
140
0.3
1.7
140
7
4734A–RKE–11/03
