ML2751

4

January, 2000

PRELIMINARY

PRELIMINARY DATASHEET

PIN DESCRIPTIONS

PIN CONFIGURATION

1

2

3

4

5

6

7

8

9

10

20

19

18

17

16

15

14

13

12

11

TOP VIEW

ML2751

20-Pin TSSOP (T20)

PAON

FEEN

TRFI

GND

RRFO

GND

GND

GND

TPS

TPA

GND

GND

TRFO

GND

GND

VCC

GND

PINB

PIN

RLNI

LNA Section

5

RRFO

O (analog)

Receive RF Output. LNA RF Output. This is an open collector output

that requires an external load to VCC. This pin requires matching for

optimum gain

11

RLNI

I (analog)

Receive LNA RF input. This pin is directly connected to the base of an

NPN transistor. The input to this pin should be AC coupled using an

external capacitor. This input will require matching for optimum

performance

PA Section

3

TRFI

I (analog)

Transmit RF Power Amplifier (PA) input. Requires RF choke to VCC that

can handle up to 150mA. The VCC end of the choke requires both RF

and low frequency decoupling to ground to minimize supply

modulation

9

TPS

I (analog)

This pin is the non-inverting input of an op amp. The voltage on this pin

sets the RF power produced by the PA, permitting variable power

operation under control of the baseband circuits (see Figure 2)

10

TPA

I (analog)

This pin is the inverting input of an operational amplifier. A resistor

from this pin to GND scales the TPS input voltage control range to

match that of the external baseband control circuits. If scaling of the

TPS input range is not required the TPA pin can either be grounded or

left floating (see Figure 2)

18

TRFO

O (analog)

Transmit RF Power Amplifier output. Open collector output. Requires

RF choke to VCC that can handle up to 150mA. The VCC end of the

choke requires both RF and low frequency decoupling to ground to

minimize supply modulation

Pin #

Signal Name

I/O Type

Description