MG2253 is a CMOS TIA with wide input dynamic range, high optical sensitivity，high overload tolerance (0dBm) and low harmonic distortion. When used with APD photo detector, optical sensitivity can be better than -33dBm; with PIN detector, sensitivity of -28dBm can be achieved. Automatic gain control (AGC) circuit is implemented in order to achieve wide dynamic range. In addition to automatically reducing TIA gain, this AGC circuit also helps to maintain integrity of input signal with excellent transimpedance linearity over frequency and input range. A current sourcing monitor of average photodiode current is available at MON pad for receiver power monitoring in both PIN and APD application through bonding options.