19

LT5514

5514f

APPLICATIO S I FOR ATIO

Information furnished by Linear Technology Corporation is believed to be accurate and reliable.

However, no responsibility is assumed for its use. Linear Technology Corporation makes no represen-

tation that the interconnection of its circuits as described herein will not infringe on existing patent rights.

At high frequency, the difference between the top and

bottom curves in Figure 12 is simply power loss. Starting

(top curve), the next lower curve takes into account the

transformer insertion loss. The next curve below this

curve in the plot includes the effects of transformer

The transformer board can provide a differential output

when Jumper J2 is removed.

The Wideband Differential Output Application Board (Fig-

ure 11) is an example of direct coupling (no transformer)

to the load, and has wider output bandwidth. This board

gives direct access to the LT5514’s output pins, and was

compensate for the DC voltage drop on R1 and R2. Use

TP2, TP3 to monitor the actual LT5514 output bias volt-

age. By replacing R1 and R2 with inductors, this board can

operate with a 5V supply. However, this may limit the

minimum signal frequency. For example, an 820nH choke

inductor will limit the lowest signal frequency to 40MHz.

PACKAGE DESCRIPTIO

FE Package

20-Lead Plastic TSSOP (4.4mm)

(Reference LTC DWG # 05-08-1663)

Exposed Pad Variation CB

FE20 (CB) TSSOP 0204

0.09 – 0.20

(.0035 – .0079)

0

° – 8°

0.25

REF

RECOMMENDED SOLDER PAD LAYOUT

0.50 – 0.75

(.020 – .030)

4.30 – 4.50*

(.169 – .177)

13

4

5

6 7 89 10

11

12

14 13

6.40 – 6.60*

(.252 – .260)

3.86

(.152)

2.74

(.108)

20 1918 17 16 15

1.20

(.047)

MAX

0.05 – 0.15

(.002 – .006)

0.65

(.0256)

BSC

0.195 – 0.30

(.0077 – .0118)

TYP

2

2.74

(.108)

0.45

±0.05

0.65 BSC

4.50

±0.10

6.60

±0.10

1.05

±0.10

3.86

(.152)

MILLIMETERS

(INCHES)

*DIMENSIONS DO NOT INCLUDE MOLD FLASH. MOLD FLASH

SHALL NOT EXCEED 0.150mm (.006") PER SIDE

NOTE:

1. CONTROLLING DIMENSION: MILLIMETERS

2. DIMENSIONS ARE IN

3. DRAWING NOT TO SCALE

SEE NOTE 4

4. RECOMMENDED MINIMUM PCB METAL SIZE

FOR EXPOSED PAD ATTACHMENT

6.40

(.252)

BSC