DRV134 Datasheet, PDF (8/20 Pages) Burr-Brown (TI) – AUDIO BALANCED LINE DRIVERS

APPLICATIONS INFORMATION
The DRV134 (and DRV135 in SO-8 package) converts a
single-ended, ground-referenced input to a floating differ-
ential output with +6dB gain (G = 2). Figure 1 shows the
basic connections required for operation. Decoupling ca-
pacitors placed close to the device pins are strongly recom-
mended in applications with noisy or high impedance power
supplies.
The DRV134 consists of an input inverter driving a cross-
coupled differential output stage with 50Ω series output
resistors. Characterized by low differential-mode output
impedance (50Ω) and high common-mode output imped-
ance (1.6kΩ), the DRV134 is ideal for audio applications.
Normally, +V_O is connected to +Sense, –V_O is connected to
–Sense, and the outputs are taken from these junctions as
shown in Figure 1. For applications with large dc cable
offset errors, a 10µF electrolytic nonpolarized blocking
capacitor at each sense pin is recommended as shown in
Figure 2.
V–
1µF
5 (11)
DRV134
DRV135
4
V_IN
(6)
A1
Gnd
3
(5)
V+
1µF
6 (12)
50Ω ₈
A2
+V_O
(14)
10kΩ
7
(13) +Sense
G = +6dB
2 –Sense
(4)
50Ω ₁
A3
–V_O
(3)
All resistors 30kΩ unless otherwise indicated.
SOL-16 pin numbers in parentheses.
FIGURE 1. Basic Connections.
10kΩ
DRV134
DRV135
4
V_IN
A1
Gnd ³
DRIVER
RECEIVER
50Ω ₈
A2
10µF⁽¹⁾
7
+V_O
BALANCED
CABLE PAIR
–V_O
2
5
10kΩ
6
V_O
2 ^10µF(1)
50Ω ₁
–V_O
A3
3
+V_O
1
INA134, INA137
All resistors 30kΩ unless otherwise indicated.
10kΩ
Pin numbers shown for DIP and SO-8 versions.
NOTE: (1) Optional 10µF electrolytic (nonpolarized) capacitors reduce common-mode offset errors.
FIGURE 2. Complete Audio Driver/Receiver Circuit.
8
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INA134 (G = 1): V_O = 2V_IN
INA137 (G = 1/2): V_O = V_IN
DRV134, DRV135
SBOS094A