10

LT1795

Figure 9 shows the effect of the network on a 200pF load.

Without the optional compensation, there is a 6dB peak at

85MHz caused by the effect of the capacitance on the

output stage. Adding a 0.01

µF bypass capacitor between

the output and the COMP pins connects the compensation

Figure 9.

FREQUENCY (MHz)

1

14

12

10

8

6

4

2

0

–2

–4

–6

10

100

1795 F09

NO

COMPENSATION

COMPENSATION

COMPENSATION

Dimensions in inches (millimeters) unless otherwise noted.

PACKAGE DESCRIPTIO

and greatly reduces the peaking. A lower value feedback

resistor can now be used, resulting in a response which is

flat to

±1dB to 45MHz. The network has the greatest effect

Although the optional compensation works well with

capacitive loads, it simply reduces the bandwidth when it

is connected with resistive loads. For instance, with a 25

Ω

load, the bandwidth drops from 48MHz to 32MHz when

the compensation is connected. Hence, the compensation

was made optional. To disconnect the optional compensa-

tion, leave the COMP pin open.

DEMO BOARD

A demo board (DC261A) is available for evaluating the

performence of the LT1795. The board is configured as a

differential line driver/receiver suitable for xDSL applica-

tions. For details, consult your local sales representative.

S20 (WIDE) 0396

NOTE 1

0.496 – 0.512*

(12.598 – 13.005)

20

19

18

17

16

15

14

13

1

23

4

5

6

78

0.394 – 0.419

(10.007 – 10.643)

910

11

12

0.037 – 0.045

(0.940 – 1.143)

0.004 – 0.012

(0.102 – 0.305)

0.093 – 0.104

(2.362 – 2.642)

0.050

(1.270)

TYP

0.014 – 0.019

(0.356 – 0.482)

TYP

0

° – 8° TYP

NOTE 1

0.009 – 0.013

(0.229 – 0.330)

0.016 – 0.050

(0.406 – 1.270)

0.291 – 0.299**

(7.391 – 7.595)

× 45°

0.010 – 0.029

(0.254 – 0.737)

NOTE:

1. PIN 1 IDENT, NOTCH ON TOP AND CAVITIES ON THE BOTTOM OF PACKAGES ARE THE MANUFACTURING OPTIONS.

THE PART MAY BE SUPPLIED WITH OR WITHOUT ANY OF THE OPTIONS

DIMENSION DOES NOT INCLUDE MOLD FLASH. MOLD FLASH SHALL NOT EXCEED 0.006" (0.152mm) PER SIDE

DIMENSION DOES NOT INCLUDE INTERLEAD FLASH. INTERLEAD FLASH SHALL NOT EXCEED 0.010" (0.254mm) PER SIDE

*

**

SW Package

20-Lead Plastic Small Outline (Wide 0.300)

(LTC DWG # 05-08-1620)