CC102X

Connected to

VDD/ GND/ MCU

RF_OUT

PA_EN

LNA_EN

RF__IN

SAW

CC1190

VDD

PA_EN

LNA_EN

HGM

TR_SW

LNA_OUT

PA_OUT

PA_IN

LNA_IN

CC1190

SWRS089 A – NOVEMBER 2009 – REVISED FEBRUARY 2010

www.ti.com

INTERFACE AND CONTROL

Controlling the Output Power from CC1190

The output power of CC1190 is controlled by controlling the input power. The CC1190 PA is designed to work in

compression (class AB), and the best efficiency is reached when a strong input signal is applied. The output

power can be reduced by setting the pin HGM low. If a reduced maximum output power is wanted, the

impedance seen by the PA should be increased, thus increasing the PA efficiency by changing the output

matching network.

Input Levels on Control Pins

The three digital control pins (PA_EN, LNA_EN, HGM) have built-in level-shifting functionality, meaning that if

CC1190 is operating from a 3.6 V supply voltage, the control pins will still sense 1.6 - 1.8 V signals as logical '1'.

An example of the above is that PA_EN is connected directly to the PA_EN pin on CC110x, but the global supply

voltage is 3.6 V. The PA_EN pin on CC110x will switch between 0 V (RX) and 1.8 V (TX), and this is still a high

enough voltage to control the operating mode of CC1190.

However, the input voltages should not have logical '1' level that is higher than the supply.

Connecting CC1190 to a CC102X Device

Table 2. Control Logic for Connecting CC1190 to a CC102X Device

PA_EN

LNA_EN

HGM

Mode Of Operation

0

0

don't care

Power Down

0

1

0

RX Low Gain Mode

0

1

1

RX High Gain Mode

1

0

0

TX Low Gain Mode

1

0

1

TX High Gain Mode

Figure 11. CC1190 + CC102X Application Circuit

8

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