4 Pin Configuration and Functions

OUT1

OUT2

COMP2

VDD

RFIN

1

2

3

4

5

VRAMP

TX_EN

BS

COMP1

GND

6

7

8

9

10

Figure 4-1. LMV242: NGY Package, WSON-10

(Top View)

NC

OUT

COMP2

VDD

RFIN

1

2

3

4

5

VRAMP

TX_EN

GND

COMP1

GND

6

7

8

9

10

Figure 4-2. LMV2421: NGY Package, WSON-10

(Top View)

Table 4-1. Pin Functions

PIN

TYPE(1)

DESCRIPTION

NAME

NO.

LMV242

LMV2421

BS

8

—

Digital input(2)

Schmitt-triggered band select pin. When BS = H, channel 1 (OUT1) is

selected, when BS = L, channel 2 (OUT2) is selected.

COMP1

9

9

Compensation

Connects an external RC network between the COMP1 pin and the

COMP2 pin for an overall loop compensation and to control the closed

loop frequency response. Conventional loop stability techniques can be

used in selecting this network, such as bode plots. A good starting value

for the RC combination is C = 68pF and R = 0Ω.

COMP2

3

3

Compensation

Frequency compensation pin. The BS signal (LMV242 only) switches this

pin either to OUT1 or to OUT2.

GND

10

8, 10

Ground

Power ground

NC

—

1

—

No connect. Leave this pin floating.

OUT

—

2

Output

This pin is connected to the PA.

OUT1

1

—

Output

This pin is connected to the PA of either channel 1 or channel 2.

OUT2

2

—

Output

This pin is connected to the PA of either channel 1 or channel 2.

RFIN (3)

5

5

Analog input

RF input connected to the coupler output with optional attenuation to

detect the power amplifier (PA) and antenna RF power levels.

TX_EN

7

7

Digital input(2)

Schmitt-triggered logic input. A low shuts down the whole chip for battery-

saving purposes. A high enables the chip.

VDD

4

4

Power supply

Positive supply voltage

VRAMP (3)

6

6

Analog input

Sets the RF output power level. The useful input voltage range is from

0.2V to 1.8V, although voltages from 0V to VDD are allowed.

(1)

All inputs and outputs are referenced to GND (pin 10).

(2)

For the digital inputs, a low is < 0.8V and a high is > 1.8V.

(3)

RF power detection performed internally in the LMV242x; use an RF power coupler with optional extra attenuation.

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LMV242, LMV2421

SNWS014D – MARCH 2004 – REVISED JUNE 2025

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