MT-075 datasheet(5/9 Pages) AD

5 / 9 page

MT-075

Figure 3C shows a circuit where β1 = 0 and β2 = 1. This circuit is essentially provides a

resistorless gain of 2.

Figure 3D shows a circuit where β2 = 1, and β1 is determined by RF1 and RG1. The gain of this

circuit is always less than 2.

Finally, the circuit of Figure 3E has β2 = 0, and is very similar to a conventional inverting op

amp, except for the additional complementary output at VOUT+.

DIFFERENTIAL DRIVER/RECEIVER APPLICATIONS

The AD813x/ADA493x-series are also well suited to balanced differential line driving as shown

in Figure 4 where the AD8132 drives a 100-

Ω twisted pair cable. The AD8132 is configured as a

gain of 2 driver to account for the factor of 2 loss due to the source and load terminated cable. In

this configuration, the bandwidth of the AD8132 is approximately 160 MHz.

–

VIN

49.9 Ω

499Ω

1kΩ

523 Ω

49.9Ω

VOCM

AD8132

0.1µF

FROM 50 Ω

SOURCE

+5V

–5V

GM1

100

0.1µF

–

0.1µF

+5V

–5V

100

TWISTED

PAIR

AD8130

A = 1

VOUT

GROUND 1

GROUND 2

Gain = 1 +

Figure 4: High Speed Differential Line Driver,

Line Receiver Applications

The line receiver is an AD8130 differential receiver which has a unique architecture called

"active

feedback"

achieve

approximately

common-mode

rejection

10 MHz. For a gain of 1, the AD8130 has a 3 dB bandwidth of approximately 270 MHz.

The AD8130 utilizes two identical input transconductance (gm) stages whose output currents are

summed together at a high impedance node and then buffered to the output. The output currents

of the two gm stages must be equal but opposite in sign, therefore, the respective input voltages

must also be equal but opposite in sign. The differential input signal is applied to one of the

Page 5 of 9

MT-075 Datasheet(PDF) 5 Page - Analog Devices

MT-075 Datasheet(HTML) 5 Page - Analog Devices

Html Pages

1 2 3 4 5 6 7 8 9

Datasheet Download

Link URL