QUAD DIFFERENTIAL LINE DRIVER
DESCRIPTION
The quad differential line driver is a monolithic integrated circuit intended to provide low noise, low
distortion voltage gain.
Additionally, the signal is converted from a single
ended to a differential signal pair for applications
reuiring signal isolation from DC grounded.
The four channel’s gains are matched within 1dB.
TDA7237
PRODUCT PREVIEW
DIP18
ORDERING NUMBER: TDA7237
BLOCK DIAGR A M
10µF
10µF
10µF
10µF
10µF
C(ext)
CH1I
GND
CH2I
CH3I
CH4I
18
3
5
4
7
8
1,2,6
N.C.
BIAS
GENERATOR
V
17
CH1
CH2
CH3
CH4
CC
16
15
14
13
12
11
10
9
D95AU385
CH1Iout
CH1Nout
CH2Iout
CH2Nout
CH3Iout
CH3Nout
CH4Iout
CH4Nout
November 1995
This is advanced information on a new product now in development or undergoing evaluation. Details are subject to change without notice.
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TDA7237
ABSOLUTE MAX IMUM RAT INGS
Symbol Parameter Value Unit
V
S
P
tot
T
amb
T
stg
PIN CONN E CT ION
Supply Voltage 20 V
Total Power Dissipation 750 mW
Operating Ambient Temperature -40 to 85 °C
Storage Temperature -55 to 150 °C
N.C.
N.C.
CH1I
CH2I
GND
N.C.
CH3I
CH4I
CH4NO
1
2
3
4
5
6
7
8
9 CH4IO
D95AU386
17
16
15
14
13
12
11
10
CEXT18
V
S
CH1IO
CH1NO
CH2IO
CH2NO
CH3IO
CH3NO
THERMAL DAT A
Symbol Parameter Value Unit
Rth j-pins Thermal Resistance junction - pins 90 °C/W
PIN FUNCTIONS
N. Name Function
1 N.C.
2 N.C.
3 CH1I Input to channel one
4 CH2I Input to channel two
5 GND Ground
6 N.C.
7 CH3I Input to channel three
8 CH4I Input to channel four
9 CH4NO Channel four non inverting output
10 CH4IO Channel four inverting output
11 CH3NO Channel three non inverting output
12 CH3IO Channel three inverting output
13 CH2NO Channel two non inverting output
14 CH2IO Channel two inverting output
15 CH1NO Channel one non inverting output
16 CH1IO Channel one inverting output
17 V
18 CEXT By-pass Capacitor
S
Supply Voltage
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TDA7237
ELECTRICAL CHARACTERISTICS (V CC = 10V; Tamb = 25°C; f = 1KHz, unless otherwise specified.)
Symbol Parameter Test Condition Min. Typ. Max. Unit
S Supply Voltage 9 11 V
V
ZI Input Impedance 15 23 30 KΩ
SVR Supply Voltage Rejection f = 10KHz 35 45 dB
Isg Output Short Circuit Current to
GND
Output Short Circuit Current to
V
CC
Is Supply Current 35 50 mA
S
R
Slew Rate RL = 10KW; CL = 1000pF 3 V/µs
S/N Signal to Noise Ratio (1) 83 91 dB
THD Total Harmonic Distortion V
C
S
IDC DC Input Voltage 5.8 6.25 6.6 V
V
Channel Separation (2) 70 80 dB
VODC DC Output Voltage 3.9 4.75 5.3 V
VCDC DC C
O Output Impedance 50 100 Ω
Z
Voltage pin 18 5.8 6.25 6.6 V
ext
Gv Voltage Gain 15.9 16.7 17.5 dB
Notes:
1) Bw = 20Hz to 20KHz with 60dB/decade Rolloff (referred to 1.4V
2) All input AC grounded via 10µF capacitor
each pin 40 mA
all pins 300 mA
each pin 20 mA
all pins 150 mA
O = 4V
C
L = 1000pF
; RL = 10KW;
RMS
)
RMS
0.07 0.1 %
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TDA7237
DIP18 PACKAGE ME CHANI CAL DATA
DIM.
MIN. TYP. MAX. MIN. TYP. MAX.
a1 0.254 0.010
B 1.39 1.65 0.055 0.065
b 0.45 0.018
b1 0.25 0.010
D 25.4 1.000
E 8.5 0.335
e 2.54 0.100
e3 22.86 0.900
F 7.1 0.280
I 3.93 0.155
L 3.3 0.130
Z 1.34 0.053
mm inch
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TDA7237
Information furnished is believed to be accurate and reliable. However, SGS-THOMSON Microelectronics assumes no responsibility for the
consequences of use of such information nor for any infringement of patents or other rights of third parties which may result from its use. No
license is granted by implicat ion or otherwise under any patent or pat e nt rights of SGS-THOMSON M icroelect ronic s. Specifications mentione d
in this publication are subject to change without notice. This publication supersedes and replaces all information previously supplied.
SGS-THOMSON Microelectronics products are not authorized for use as critical components in life support devices or systems without express
written approval of SGS-THOMSON Microelect ronics.
© 1995 SGS-THOMSON Microelectronics All Rights Reserved
SGS-THOMSON Microelectronics GROUP OF COMPANIES
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