ADTR1107ACCZ-R7 datasheet(23/28 Pages) AD

23 / 28 page

Data Sheet

ADTR1107

Rev. A | Page 23 of 28

THEORY OF OPERATION

The ADTR1107 is a multichip transmit/receive module that

consists of an LNA, a medium power amplifier, and a silicon

SPDT reflective switch. The ANT antenna port is dc-coupled to

0 V and no dc block is required at this port when the RF line

potential is equal to 0 V. The switch has an integrated driver to

perform logic functions internally and provides a simplified

complementary metal-oxide semiconductor (CMOS)/low

voltage transistor to transistor logic (LVTTL)-compatible

control interface. The driver features a single digital control

input pin, CTRL_SW. The logic level applied to CTRL_SW

determines whether the ADTR1107 is in transmit state or

receive state (see Table 8).

The receive path contains a self biased LNA with optional bias

control using the VGG_LNA pin for bias adjustment. For self

biased operation, the VGG_LNA pin is set to 0 V or connected

to ground. The receive path output (RX_OUT) is dc-coupled to

ground through an 8 kΩ resistor. No dc block is required at this

port when the RF line potential is equal to 0 V.

The transmit path contains a power amplifier. The bias

current is set using VGG_PA. The transmit path input (TX_IN)

is dc-coupled to ground through a 2.5 kΩ resistor. No dc block

is required at this port when the RF line potential is equal to 0 V.

A directional coupler is incorporated into the ADTR1107 to

allow for monitoring of the transmit power level.

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