8

®

DRV134, 135

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 50

Ω series output

resistors. Characterized by low differential-mode output

impedance (50

Ω) and high common-mode output imped-

ance (1.6k

Ω), the DRV134 is ideal for audio applications.

–Sense, and the outputs are taken from these junctions as

shown in Figure 1. For applications with large dc cable

offset errors, a 10

µF electrolytic nonpolarized blocking

capacitor at each sense pin is recommended as shown in

Figure 2.

FIGURE 1. Basic Connections.

FIGURE 2. Complete Audio Driver/Receiver Circuit.

V

IN

Gnd

+V

O

A2

10k

Ω

50

Ω

50

Ω

All resistors 30k

Ω unless otherwise indicated.

SOL-16 pin numbers in parentheses.

+Sense

–Sense

–V

O

G = +6dB

V+

(12)

6

A3

A1

10k

Ω

1

µF

V–

DRV134

DRV135

5

(11)

1

µF

4

(6)

3

(5)

8

(14)

7

(13)

2

(4)

1

(3)

V

IN

Gnd

A2

10k

Ω

50

Ω

50

Ω

All resistors 30k

Ω unless otherwise indicated.

Pin numbers shown for DIP and SO-8 versions.

NOTE: (1) Optional 10

µF electrolytic (nonpolarized) capacitors reduce common-mode offset errors.

INA134 (G = 1):

V

INA137 (G = 1/2): V

A3

A1

10k

Ω

DRV134

DRV135

4

3

8

+V

O

–V

O

+V

O

–V

O

7

2

1

INA134, INA137

RECEIVER

DRIVER

BALANCED

CABLE PAIR

V

O

5

6

1

2

3

10

10