STV1389AQ
CABLE DRIVER FOR DIGITAL TRANSFER
November 1992
2A
VEE
VEE
VEE
VEE
INX
GND6
GND7
3B
GND
GND
1A
3A
GND
GND
2B
GND5
GND4
GND2
GND3
1B
GND
GND
GND
INY
24
17
18
19
20
23
21
22
1
2
3
4
5
6
7
8
25
26
27
28
29
30
31
32
15
16
9
10
11
12
13
14
N.C.
N.C.
N.C.
N.C.
N.C.
N.C.
N.C.
1389-01.EPS
PIN CONNECTIONS
QFP32
(Plastic Package)
ORDER CODE : STV1389AQ
.
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
DESCRIPTION
The STV1389AQ offers in a single-chip a complete
IC driver for digital data transfer.
1/7
PIN DESCRIPTION
Pin
Number
Symbol
Standard
DC
Voltage
Equivalent Circuit
Description
7
9
INY
INX
- 2.7V
Input pin of the differential
amplifier. Input executed after DC
portion is cut off.
1
2
17
18
25
26
GND2
GND3
GND4
GND5
GND6
GND7
-
Collector of the emitter follower
output Tr.
Connect to GND.
32
3
16
20
23
27
1A
1B
2A
2B
3A
3B
- 2.7V
Emitter of emitter follower output
Tr.
To use, connect pull-down
resistor. (Even when only 1 side is
used pull-down is executed In
pairs.)
Pairs
32
16
23
3
20
27
1389-01.TBL
7
9
GND
VEE
1mA
1mA
180
2k
180
2k
1389-02.EPS
GND
VEE
1mA
1
2
17
18
26
25
27
32
3
16
20
23
1k
1389-03.EPS
STV1389AQ
2/7
15
24
1
2
3
4
5
6
7
8
25
26
27
28
29
30
31
32
17
18
19
20
23
16
9
10
11
12
13
14
BIAS
GEN
21
22
-5V
2A
VEE
VEE
VEE
VEE
INX
GND6
GND7
3B
GND
GND
1A
3A
GND
GND
2B
GND5 GND4
GND2 GND3
1B
GND
GND
GND
INY
Co-axial cable
-5V
0.1
µ
F
150
75
1.6Vp-p
0.6Vp-p
0.6Vp-p
0.1
µ
F
0.1
µ
F
N.C.
N.C.
N.C.
N.C.
N.C.
N.C.
N.C.
When the below input is applied
between INX and INY, in-phase
1.6Vp-p is output at 1A, 2A and 3A.
In reversed phase, 1.6Vp-p is output
at 1B, 2B and 3B.
* Various output pins are connected
as indicated below.
1389-04.EPS
BLOCK DIAGRAM
ABSOLUTE MAXIMUM RATINGS
Symbol
Parameter
Value
Unit
V
CC
Supply Voltage
7.0
V
T
stg
Storage Temperature
- 65, + 150
o
C
P
D
Allowable Power Dissipation
500
mW
1389-02.TBL
OPERATING CONDITIONS
Symbol
Parameter
Value
Unit
V
CC
Supply Voltage
4.8 to 5.2
V
T
opr
Operating Temperature
- 20, + 75
o
C
1389-03.TBL
ELECTRICAL CHARACTERISTICS
Symbol
Parameter
Bias Conditio ns
SW
ON
Test
Point
Test
Min.
Typ.
Max.
Unit
V INY
V INX
V1
Pin Voltage INY
-
-
-
Pin 7
Test of pin voltage
- 2.9
- 2.7
- 2.5
V
V2
Pin Voltage INX
-
-
-
PIn 9
- 2.9
- 2.7
- 2.5
V
A1-1
PIn Voltage 1A
-
-
-
Pin 32
- 3.1
- 2.7
- 2.5
V
B1-1
Pin Voltage 1B
-
-
-
Pin 3
- 3.1
- 2.7
- 2.5
V
A2-1
PIn Voltage 2A
-
-
-
Pin 16
- 3.1
- 2.7
- 2.5
V
B2-1
Pin Voltage 2B
-
-
-
Pin 3
- 3.1
- 2.7
- 2.5
V
1389-04.TBL
STV1389AQ
3/7
ELECTRICAL CHARACTERISTICS (T
A
= 25
o
C)
Symbol
Parameter
Bias Conditions
SW
ON
Test
Point
Test
Min.
Typ.
Max.
Unit
V INY
V INX
A3-1
PIn Voltage 3A
-
-
-
Pin 23
Test of pin voltage
- 3.1
- 2.7
- 2.5
V
B3-1
Pin Voltage 3B
-
-
-
Pin 27
- 3.1
- 2.7
- 2.5
V
IEE
Current Power
Supply
-
-
-
VEE
Current power supply at
VEE
- 143
- 77
mA
A1-2
DC applied 1A
V1 + 0.2
V2 - 0.2
SW1
SW2
Pin 32 Output DC voltage is
tested when +0.2V is
applied to INY and - 0.2V
to INX.
(A1-2) = Test value - (A1-1)
(B1-2) = Test value - (B1-1)
The difference with the
previous pin voltage is
recorded. Same for A2-2,
B2-2, A3-2, B3-2
0.31
0.39
0.47
V
B1-2
DC applied 1B
Pin 3
-
0.47
-
0.39
-
0.31
V
A2-2
DC applied 2A
Pin 16
0.31
0.39
0.47
V
B2-2
DC applied 2B
Pin 20
-
0.47
-
0.39
-
0.31
V
A3-2
DC applied 3A
Pin 23
0.31
0.39
0.47
V
B3-2
DC applied 3B
Pin 27
-
0.47
-
0.39
-
0.31
V
V1-1
Amplitude
1A + 1B
Calculation
(V1-1) = (A1-2) - (B1-2)
Amplitude calculated from
T10 with T15 as base,
same for V2-1, V3-1.
0.65
0.75
0.85
V
V2-1
Amplitude
2A + 2B
Calculation
0.65
0.75
0.85
V
V3-1
Amplitude
3A + 3B
Calculation
0.65
0.75
0.85
V
-
Amplitude
1A/1B
Calculation
(A1-2) / (B1-2)
0.85
1.0
1.15
-
-
Amplitude
2A/2B
Calculation
0.85
1.0
1.15
-
-
Amplitude
3A/3B
Calculation
0.85
1.0
1.15
-
A1-3
DC applied 1A'
V1 - 0.4
V1 + 0.4
SW1
SW2
Pin 32 Output DC voltage is
tested when - 0.4V is
applied to INY and + 0.4V
to INX.
(A1-3) = Test value - (A1-1)
(B1-3) = Test value - (B1-1)
The difference with the
previous pin voltage is
recorded. Same for A2-3,
B2-3, A3-3, B3-3
- 0.9
-
0.75
- 0.6
V
B1-3
DC applied 1B'
Pin 3
0.6
0.75
0.9
V
A2-3
DC applied 2A'
Pin 16
- 0.9
-
0.75
- 0.6
V
B2-3
DC applied 2B'
Pin 20
0.6
0.75
0.9
V
A3-3
DC applied 3A'
Pin 23
- 0.9
-
0.75
- 0.6
V
B3-3
DC applied 3B'
Pin 27
0.6
0.75
0.9
V
V1-2
Amplitud'e
1A' + 1B
Calculation
(V1-2) = (A1-3) + (B1-3)
Amplitude calculated from
T22 with T27 as base,
same for V2-2, V3-2.
1.3
1.5
1.7
V
V2-2
Amplitude
2A' + 2B'
Calculation
1.3
1.5
1.7
V
V3-2
Amplitude
3A' + 3B'
Calculation
1.3
1.5
1.7
V
-
Amplitude
1A' + 1B'
Calculation
(A1-3) / (B1-3)
0.85
1.0
1.15
V
-
Amplitude
2A' + 2B'
Calculation
(A2-3) / (B2-3)
0.85
1.0
1.15
V
-
Amplitude
3A' + 3B'
Calculation
(A3-3) / (B3-3)
0.85
1.0
1.15
V
V1-3
Linearity 1
Calculation
(V1-2) / (V1-1)
1.7
1.9
2.1
V
V2-3
Linearity 2
Calculation
(V2-2) / (V1-1)
1.7
1.9
2.1
V
V3-3
Linearity 3
Calculation
(V3-2) / (V1-1)
1.7
1.9
2.1
V
1389-05.TBL
STV1389AQ
4/7
15
24
1
2
3
4
5
6
7
8
25
26
27
28
29
30
31
32
17
18
19
20
23
16
9
10
11
12
13
14
BIAS
GEN
21
22
3A
2B
2A
1B
1A
3B
INY A
INX B
SW2
V INX
SW1
V INY
-5V
VEE
-5V
150
150
150
150
150
150
1389-05.EPS
TEST CIRCUIT
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 75
to match a 75
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.
BIAS
GEN
0.1
µ
F
150
75
0.1
µ
F
150
75
75
0.1
µ
F
0.1
µ
F
0.1
µ
F
75
- 5V
75
Co-axial cable
DC cut
6dB
Differential
amplifier
To the other 2 channels
0.6V
1.5V
STV1389AQ
DC cut
Signal
source =
0.8Vpp
Matching resistor
Matching resistor
1389-06.EPS
STV1389AQ
5/7
PDF 
ZIP