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PDF STV1389AQ Data sheet ( Hoja de datos )
| Número de pieza | STV1389AQ | |
| Descripción | CABLE DRIVER FOR DIGITAL TRANSFER | |
| Fabricantes | ST Microelectronics | |
| Logotipo |  |
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STV1389AQ
CABLE DRIVER FOR DIGITAL TRANSFER
. 1 DIFFERENTIAL INPUT, 3 DIFFERENTIAL
OUTPUTS
. SUFFICIENT DRIVE CAPABILITY FOR A
300m LENGTH COAXIAL CABLE
. STABILITY DUE TO MINIMAL WAVEFORM
DISTORTION
. BIPOLAR SILICON MONOLITHIC IC
.APPLICATIONS
DATA TRANSFER BETWEEN DIGITAL SIG-
NAL PROCESSING EQUIPMENT
QFP32
(Plastic Package)
ORDER CODE : STV1389AQ
DESCRIPTION
The STV1389AQ offers in a single-chip a complete
IC driver for digital data transfer.
PIN CONNECTIONS
GND6
24 23
25
22 21 20 19 18 17
16 2A
GND7 26
15 N.C.
3B 27
14 VEE
N.C. 28
13 VEE
GND 29
12 VEE
GND 30
11 VEE
N.C. 31
10 N.C.
1A 32
1
9 INX
2345678
November 1992
1/7
1 page  
STV1389AQ
TEST CIRCUIT
150 Ω
150 Ω
150 Ω
150 Ω
24 23 22 21 20 19 18 17
3A
25
2B
16
2A
150 Ω
26 15
27 3B
28
-5V 14
13
-5V
VEE
29 12
30 11
31
BIAS
GEN
10
1A
32 1B
9
INX B
INY A
12345678
SW2
V INX
150 Ω
SW1
V INY
DESCRIPTION OF OPERATION
The STV1389AQ consists of 3 differential amplifier
with a common input and a bias generator, and
three differential outputs. Each amplifiers provides
a 6dB gain and is configured as a differential output
feeding the bases of a pair of current boosting
on-chip emitter follower transistors. The differential
input pins are internally biased and the input signal
is ac-coupled to remove the D.C. component.
Between the output pins of each differential ampli-
fier and the coaxial cable, an R-C network is con-
nected to remove D.C. component from the output
and for impedance matching. The series resistor
has a value of 68 to 75Ω to match a 75Ω coaxial
cable. In this manner a signal almost identitical in
level to the input signal is transferred to the coaxial
cable.
Optimum PCB layout and matching resistor value
are chosen to obtain good eye pattern design at the
input pins. This is necessary because the wave-
form distortion at the input pins is directly trans-
ferred to the output waveform.
Matching resistor 0.1µF
Signal
source =
0.8Vpp
0.1µF
DC cut
0.6V
STV1389AQ
BIAS
GEN
6dB
Differential
amplifier
To the other 2 channels
DC cut
Matching resistor
0.1 µF 75 Ω
150 Ω
150 Ω
- 5V
0.1µF
75 Ω
75 Ω
Co-axial cable
0.1 µF 75 Ω
1.5V
75 Ω
5/7
5 Page | ||
| Páginas | Total 7 Páginas | |
| PDF Descargar | [ Datasheet STV1389AQ.PDF ] | |
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