Pin Descriptions

Pin

Name

Description

Power Supply

A3

V

DD

Supply Voltage

A2, C3

GND

Power Ground. Operation requires both pins be grounded.

Digital Inputs

C2

TX_EN

A Logic High to enable device.

Analog Inputs

B3

RF IN

RF Input connected to the Coupler output with optional attenuation to measure the

Power Amplifier (PA) / Antenna RF power levels.

C1

RAMP IN

Sets the RF output power level. The useful input voltage range is from 0.2V to 1.8V,

although voltages from 0V to V

Compensation

A1

Comp

Connects an external RC network between the Comp pin and the Output 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 will be C = 68pF andR=0

Ω.

Output

B1

Out

A rail-to-rail output capable of sourcing 25mA and sinking 25mA, with less than 200mV

total voltage drop over the specified temperature. The output is free from glitches when

enabled by TX_EN. When TX_EN is low, the output voltage is near GND.

Note: 1. All inputs and outputs are referenced to GND (pin A2, C3).

3. RF power detection is performed internally in the LMV243 and only an RF power coupler with optional extra attenuation has to be used.

Ordering Information

Package

Part Number

Package Marking

Transport Media

NSC Drawing

8-Bump micro SMD

LMV243BL

01

1k Units Tape and Reel

BLA08AAC

LMV243BLX

01

3k Units tape and Reel

Block Diagram

20029036

FIGURE 1.

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