u2741b ATMEL Corporation, u2741b Datasheet - Page 8

• Manufacturer Part Number: u2741b
• Description: Uhf Ask/fsk Transmitter U2741b
• Manufacturer: ATMEL Corporation

8. Electrical Characteristics (Continued)
All parameters are referred to GND (pin 5). The possible operating ranges refer to different circuit conditions:
V
8
Parameters
Oscillator frequency XTO
Loop bandwidth
Phase noise PLL
Phase noise VCO
Frequency range of the VCO
Clock output
(CMOS microcontroller compatible)
Load capacitance at CLK
Series resonance R of the crystal
FSK modulation frequency rate
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
FSK input
- Low level input voltage
- High level input voltage
- Input current High
S
= 2.0V to 5.5V at T
U2741B
amb
= –20°C to +70°C, V
Test Conditions
M-version: at T
N-version: full temperature range
(monitoring)
Crystal frequency = 13.56 MHz
Crystal frequency = 6.78 MHz
Load capacity of the crystal must be
selected accordingly
For best LO noise
Loop filter components:
C
Referring to the phase comparator
f
at 1 MHz
at 36 MHz
f
f
f
f
Duty cycle of the
modulation signal = 50%
Duty cycle of the
modulation signal = 50%
V
V
V
V
PC
XTO
XTO
XTO
XTO
CLK
CLK
CLK
CLK
2
= 3.9 nF, C
= 6.78 MHz
= 13.56 MHz
= 9.84 MHz
= 6.78 MHz
= 4.90 MHz
= 0.2
= 0.3
= 0.8
= 0.7
S
= 2.2V to 5.5V at T
V
V
V
V
1
S
S
S
S
amb
= 15 nF, R
= 25°C
4
amb
= 220
= –40°C to +85°C (typically 25°C, 3V)
Symbol
f
f
PN
PN
PN
modASK
Clk
modFSK
V
V
B
C
V
I
V
I
f
f
f
ASKh
FSKh
VCO
Rs
Rs
Rs
Rs
ASKh
XTO
XTO
I
I
FSKh
ASKl
Loop
I
I
FSKl
CLK
oh
oh
ol
ol
VCO
VCO
PLL
out
13.56 –
30 ppm
30 ppm
6.78 –
–150
–200
Min.
300
150
200
1.7
1.7
0
0
f
out
13.56
–111
–123
Typ.
6.78
100
–91
/128
13.56 +
30 ppm
30 ppm
6.78 +
Max.
–105
–119
+100
–87
450
100
150
225
140
140
0.3
0.3
10
80
20
20
4733B–RKE–09/05
dBC/Hz
dBC/Hz
MHz
MHz
MHz
MHz
Unit
kHz
kHz
kHz
pF
µA
µA
µA
µA
µA
µA
V
V
V
V