u2745b ATMEL Corporation, u2745b Datasheet - Page 6

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

Absolute Maximum Ratings
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. This is a stress rating
only and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of this
specification is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.
Thermal Resistance
Electrical Characteristics
All parameters are refered to GND (pin 5), V
The possible operating ranges refer to different circuit conditions: V
6
Parameters
Supply current (power down)
Supply current (power up, output OFF) V
Supply current (power up, output ON) V
Output power
Output power variation for
f = 315 MHz compared to
f = 433.92 MHz
Maximum peak output
antenna voltage
Spurious emission
Oscillator frequency XTO
Loop bandwidth
Phase noise PLL
Phase noise VCO
Parameters
Supply voltage
Power dissipation
Junction temperature
Storage temperature
Ambient temperature
Parameters
Junction ambient
U2745B
Test Conditions
V
V
R
f = 315 MHz
P
at P
the load impedance must be selected
to meet the V
requirement, the supply current is not
dependent on the load impedance
tolerance
f
Load capacitance at CLK £ 3 pF
f = 230 MHz to 470 MHz
f < 230 MHz, f > 470 MHz
Crystal frequency = 13.56 MHz
For best LO noise
Loop filter components:
C
Referring to the phase comparator
f
at 1 MHz
at 36 MHz
o
PC
ASK
ASK
ASK
out
S
PWRSET
2
±(n ´ f
= 3.9 nF, C
= 3 V, T
= 6.78 MHz
out
= P
, V
= GND, V
= V
= 2.0 mW,
FSK
Ref
PC
S
= 1.2 k W
S
, V
amb
+ D P
) where f
= 3 V, T
£ 0.3 V, V
S
out
= 3 V, R
1
= 25 ° C, f = 433.92 MHz
EN
= 15 nF, R
Ref
maximum
= V
PC
amb
S
S
, V
PWRSET
< 3.6 V
= 6.78 MHz
= 25 ° C, unless otherwise specified
S
4
= 3 V
= 220 W
= 1.2 k W
S
= 2.2 V to 4.0 V at T
Symbol
Symbol
IS
Symbol
V
PN
PN
PN
D P
B
T
P
IS
IS
outmax
f
T
transmit
Em
Em
P
R
V
XTO
amb
Loop
T
Ref
stg
VCO
VCO
tot
thJA
PLL
S
off
on
Ref
j
30 ppm
13.56 -
Min.
1
Min.
amb
-55
-40
= -40 ° C to +85 ° C
V
S
13.56
Value
-111
-122
Typ.
100
- 0.7 V
-90
180
4.7
1.5
10
2
3
Max.
250
150
125
85
6
13.56 +
30 ppm
Max.
12.5
-105
-40
-58
6.2
10
5
4734A–RKE–11/03
dBC/Hz
dBC/Hz
Unit
Unit
V
K/W
mW
dBm
MHz
Unit
dBC
dBC
° C
° C
° C
kHz
mA
mA
V
µA
dB
(peak)