ATR4251

www.DataSheet4U.com Features High Dynamic Range for AM and FM Integrated AGC for AM and FM High Intercept Point 3rd Order for FM FM Amplifier Adjustable to Various Cable Impedances High Intercept Point 2nd and 3rd Order for AM Low Noise Output Voltage Low Power Consumption Low Output Impedance AM 1. Description The ATR4251 is an integrated low-noise AM/FM antenna amplifier with integrated AGC in BiCMOS2S technology. The device is designed in particular for car applications, and is suitable for windshield and roof antennas. Figure 1-1. Block Diagram QFN24 Package VREF1 24 Low-noise, High-dynamicrange AM/FM Antenna Amplifier IC ATR4251 FM IN 23 FM FM GAIN GND2 OUT 22 21 20 AGC IN Paddle = GND 19 NC* GND AGC1 AGC2 VREF2 AMIN 1 FM amplifier BAND GAP AGC 18 NC* VS AGCCONST VREF4 AMOUT1 GND1 2 17 3 16 4 15 5 AM 14 6 7 8 AGC (AM) 9 10 11 12 13 T NC* NC* CREG AGC AGC AMIN AM CONST * Pin must not be connected to any other pin or supply chain except GND. 4913J–AUDR–10/09 www.DataSheet4U.com Figure 1-2. Block Diagram SSO20 Package FMGAIN FMIN VREF1 GND AGC1 AGC2 VREF2 AMIN1 CREG 1 2 3 4 5 6 7 8 9 AM AGC (AM) SSO20 Band gap AGC FM amplifier 20 GND2 19 FMOUT 18 AGCIN 17 VS 16 AGCCONST 15 VREF4 14 AMOUT1 13 GND1 12 TCONST 11 AGCAM AGCAMIN 10 2 ATR4251 4913J–AUDR–10/09 ATR4251 www.DataSheet4U.com 2. Pin Configuration Figure 2-1. Pinning QFN24 VREF1 FMIN FMGAIN GND2 FMOUT AGCIN NC GND AGC1 AGC2 VREF2 AMIN 1 2 3 4 5 6 7 8 24 23 22 21 20 19 1...