THS6002CDWP datasheet(36/47 Pages) TI2

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THS6002

DUAL DIFFERENTIAL LINE DRIVERS AND RECEIVERS

SLOS202E− JANUARY 1998− REVISED MARCH 2007

POST OFFICE BOX 655303

• DALLAS, TEXAS 75265

APPLICATION INFORMATION

HDSL

Shown in Figure 60 is an example of the THS6002 being used for HDSL-2 applications. The receiver amplifiers

within the THS6002 have been configured as predrivers for the driver amplifiers. This dual composite amplifier

setup has the effect of raising the open loop gain for the combination of both amplifiers, thereby giving improved

distortion performance.

−

12 V

−12 V

11 k

Ω

7.5 k

Ω

1 k

Ω

THS6002

Receiver 1

−

12 V

−12 V

Driver 1

Ω

1 k

Ω

511

Ω

135

Ω

Output

27.4 VO(PP)

1:1.5

−

12 V

−12 V

11 k

Ω

7.5 k

Ω

1 k

Ω

Receiver 2

12 V

−12 V

Driver 2

Ω

1 k

Ω

511

Ω

−

12 V

−12 V

THS4001

1 k

Ω

1 k

Ω

Input

3 V(PP)

−

Figure 60. HDSL-2 Line Driver

general configurations

A common error for the first-time CFB user is to create a unity gain buffer amplifier by shorting the output directly

to the inverting input. A CFB amplifier in this configuration is now commonly referred to as an oscillator. The

THS6002, like all CFB amplifiers, must have a feedback resistor for stable operation. Additionally, placing

capacitors directly from the output to the inverting input is not recommended. This is because, at high

frequencies, a capacitor has a very low impedance. This results in an unstable amplifier and should not be

considered when using a current-feedback amplifier. Because of this, integrators and simple low-pass filters,

which are easily implemented on a VFB amplifier, have to be designed slightly differently. If filtering is required,

simply place an RC-filter at the noninverting terminal of the operational-amplifier (see Figure 61).

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