The gain of the PA is approximately 27dB (depends by mode).
The maximum linear output power is 27dBm (to meet CDMA specifications)
That means the maximum input power to meet the linearity spec is 0dBm.
At 5dBm the PA is in compression and it will fail the ACPR and EVM specifications.
This PA has two functions mode. Low Gain = 24dB with Pout=18dBm, and High Gain = 27.5 with Pout=27dBm, and the maximum input level shall be according the gain of each mode (-6dBm for Low Gain, and 0dBm for High Gain)