ADTR1107ACCZ-R7 datasheet(23/27 Pages) AD

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Data Sheet

ADTR1107

THEORY OF OPERATION

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Rev. C | 23 of 27

The ADTR1107 is a transmit/receive module that consists of an

LNA, a medium power amplifier, and an 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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