LTC5598 datasheet(14/16 Pages) LINER

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LTC5598

5598f

APPLICATIONS INFORMATION

Figure 12. Bottom Side of Evaluation Board

Figure 11. Component Side of Evaluation Board

470nF

10nF

1nF

5.6Ω

1Ω

4.7μF

1nF

GND

LOP

LOM

GND

CAPA

10 11 12

24 23 22 21 20 19

VCC2

GNDRF

GND

BBMQ

BBPQ

RF OUT

LTC5598

BOARD NUMBER: DC1455A

LOP

LOM

GND

5598 F10

C10

2.2pF

3.3nH

VCC

BBMI

BBPI

Figure 10. Evaluation Circuit Schematic

this occur, the supply current could be sourced through

the EN pin ESD protection diodes, which are not designed

to carry the full supply current, and damage may result.

Evaluation Board

Figure 10 shows the evaluation board schematic. A good

ground connection is required for the exposed pad. If this

is not done properly, the RF performance will degrade.

Additionally, the exposed pad provides heat sinking for the

part and minimizes the possibility of the chip overheating.

Resistors R1 and R2 reduce the charging current in

capacitors C1 and C4 (see Figure 10) and will reduce

supply ringing during a fast power supply ramp-up in

case an inductive cable is connected to the VCC and GND

turrets. For EN = High, the voltage drop over R1 and R2

is about 0.15V. If a power supply is used that ramps up

slower than 10V/μs and limits the overshoot on the supply

below 5.6V, R1 and R2 can be omitted.

The LTC5598 can be used for base-station applications

with various modulation formats. Figure 13 shows a

typical application.

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