u2740b ETC-unknow, u2740b Datasheet - Page 6

• Manufacturer Part Number: u2740b
• Description: Am/fm Transmitter
• Manufacturer: ETC-unknow

Electrical Characteristics AC
All voltages referred to GND (Pin 5), V
Notes:
3)
4)
5)
6)
U2740B
Extinction ratio
Output current,
transmit mark,
(f
Output voltage swing
Phase detector
Output current
Phase detector
Output voltage swing
Enable settling time
Modulation bandwidth
Output frequency range
XTO frequency range
Modulation bandwidth
6 (10)
VCO
power depends on the load impedance. If optimum load impedance of 1.1 k
= 433.92 MHz)
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
3.5 mA/2
This is the time if an external clock is delivered to Pin 9 and Pin 11 is set to V
FSK bandwidth is depending on values for loop filter and VCO, see application note for design hints.
Parameters
5)
sqrt(2)
4)
3)
6)
V
V
Difference, Pins 13 and 14
11
11
1.1 k
Test Conditions / Pins
= 3 V
= 3 V, V
W
Preliminary Information
Pins 11, 13 and 14
= 1.7 mW (+2.3 dBm) results.
S
= 2.2 to 5.5 V, T
16
Pins 13 and 14
Pins 13 and 14
Pins 9 and 10
= 0 V
Pin 7
Pin 7
Pin 6
Pin 16
amb
v
20
= –40 to +85 C, unless otherwise specified
Symbol
BW
BW
(I
I
(13–14)pp
T
i
v
out,off
f
f
out,ON
out,pp
enable
I
PDpp
VCO
XTO
PD
ASK
FSK
log
)
Min.
–40
200
2.9
0.2
–1
1
TELEFUNKEN Semiconductors
W
S
Typ.
–50
3.5
until the circuit operates.
is used, an output power of
4
V
Max.
Rev. A3, 24-Feb-97
S
100
500
500
4.2
50
–0.2
5
1
6
MHz
MHz
Unit
kHz
kHz
mA
mA
dB
m
V
V
s