U2745B
| Model | U2745B |
| Description | UHF ASK TRANSMITTER |
| PDF file | Total 9 pages (File size: 187K) |
| Chip Manufacturer | ATMEL |
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.
Parameters
Symbol
Min.
Max.
Unit
Supply voltage
Power dissipation
Junction temperature
Storage temperature
Ambient temperature
V
S
P
tot
T
j
T
stg
T
amb
-55
-40
6
250
150
125
85
V
mW
°
C
°
C
°
C
Thermal Resistance
Parameters
Symbol
Value
Unit
Junction ambient
R
thJA
180
K/W
Electrical Characteristics
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
Supply current (power down)
V
ASK
, V
FSK
£
0.3 V, V
S
< 3.6 V
IS
off
IS
on
IS
transmit
P
Ref
D
P
Ref
2
4.7
10
1
3
1.5
10
6.2
12.5
5
µA
mA
mA
dBm
dB
Supply current (power up, output OFF) V
ASK
= GND, V
EN
= V
S
, V
S
= 3 V
Supply current (power up, output ON) V
ASK
= V
S
, V
S
= 3 V, R
PWRSET
= 1.2 k
W
Output power
Output power variation for
f = 315 MHz compared to
f = 433.92 MHz
V
S
= 3 V, T
amb
= 25
°
C, f = 433.92 MHz
R
PWRSET
= 1.2 k
W
f = 315 MHz
P
out
= P
Ref
+
D
P
Ref
at P
out
= 2.0 mW,
the load impedance must be selected
to meet the V
out
maximum
requirement, the supply current is not
dependent on the load impedance
tolerance
f
o
±(n
´
f
PC
) where f
PC
= 6.78 MHz
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
2
= 3.9 nF, C
1
= 15 nF, R
4
= 220
W
Referring to the phase comparator
f
PC
= 6.78 MHz
at 1 MHz
at 36 MHz
Maximum peak output
antenna voltage
V
outmax
V
S
- 0.7 V
V
(peak)
Spurious emission
Em
Em
f
XTO
B
Loop
PN
PLL
PN
VCO
PN
VCO
13.56 -
30 ppm
13.56
-40
-58
13.56 +
30 ppm
dBC
dBC
MHz
Oscillator frequency XTO
Loop bandwidth
100
kHz
Phase noise PLL
Phase noise VCO
-111
-90
-122
-105
dBC/Hz
dBC/Hz
6
U2745B
4734A–RKE–11/03
Related PDFs
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|---|---|---|---|
 U2745B-MFB
|
UHF ASK TRANSMITTER | ATMEL | Preview |
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UHF ASK TRANSMITTER | ATMEL | Preview |
