U2740B
| Model | U2740B |
| Description | UHF AM/FM Transmitter |
| PDF file | Total 10 pages (File size: 267K) |
| Chip Manufacturer | TEMIC |
U2740B
Electrical Characteristics AC
All voltages referred to GND (Pin 5), V
S
= 2.2 to 5.5 V, T
amb
= –40 to +85°C, unless otherwise specified
Parameters
Extinction ratio
Test Conditions / Pins
V
11
= 3 V
Symbol
20 log
(I
out,ON
I
out,off
)
i
out,pp
v
(13–14)pp
I
PD
v
PDpp
T
enable
BW
FSK
f
VCO
f
XTO
BW
ASK
–1
0.2
Min.
–40
Typ.
–50
Max.
Unit
dB
Output current,
transmit mark,
(f
VCO
= 433.92 MHz)
3)
Output voltage swing
Phase detector
Output current
Phase detector
Output voltage swing
4)
Enable settling time
5)
Modulation bandwidth
6)
Output frequency range
XTO frequency range
Modulation bandwidth
Notes:
3)
V
11
= 3 V, V
16
= 0 V
Pins 13 and 14
Difference, Pins 13 and 14
Pin 7
Pin 7
Pins 11, 13 and 14
Pin 6
Pins 13 and 14
Pins 9 and 10
Pin 16
2.9
3.5
4
4.2
5
1
V
S
–0.2
100
50
500
6
500
mA
V
mA
V
m
s
kHz
MHz
MHz
kHz
200
1
The output peak-to-peak current is 7 times the current flowing into the AM_in Pin. The driver stage of the
power amplifier is designed so that the output current is switched between Pins 13 and 14.
The output voltage swing at each collector is limited to 2 V due to the circuit arrangement used. The output
power depends on the load impedance. If optimum load impedance of 1.1 k
W
is used, an output power of
3.5 mA/2 sqrt(2) 1.1 k
W
= 1.7 mW (+2.3 dBm) results.
This is the time if an external clock is delivered to Pin 9 and Pin 11 is set to V
S
until the circuit operates.
FSK bandwidth is depending on values for loop filter and VCO, see application note for design hints.
4)
5)
6)
6 (10)
Preliminary Information
TELEFUNKEN Semiconductors
Rev. A3, 24-Feb-97
Related PDFs
| Model | Description | Manufacturer | Operation |
|---|---|---|---|
 U2740B-BFP
|
UHF AM/FM Transmitter | TEMIC | Preview |
