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 FM IN FM FM GAIN GND2 OUT AGC IN Paddle = GND 24 NC* GND AGC1 AGC2 VREF2 AMIN 23 22 21 20 19 FM amplifier 1 18 BAND GAP 2 17 AGC 3 16 4 15 5 14 AM AGC (AM) 6 7 8 9 13 10 11 Low-noise, High-dynamicrange AM/FM Antenna Amplifier IC ATR4251 NC* VS AGCCONST VREF4 AMOUT1 GND1 12 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 Figure 1-2. Block Diagram SSO20 Package FMGAIN 1 FMIN 2 VREF1 3 GND 4 AGC1 5 AGC2 6 VREF2 7 AMIN1 8 CREG 9 20 GND2 FM amplifier 19 FMOUT 18 AGCIN AGC 17 VS 16 AGCCONST Band gap 15 VREF4 14 AMOUT1 AM AGC (AM) 13 GND1 12 TCONST 11 AGCAM AGCAMIN 10 SSO20 2 ATR4251 4913J–AUDR–10/09 ATR4251 2. Pin Configuration Pinning QFN24 VREF1 FMIN FMGAIN GND2 FMOUT AGCIN Figure 2-1. 1 24 23 22 21 20 19 18 2 17 3 16 4 15 5 14 6 7 8 13 9 10 11 12 NC VS AGCCONST VREF4 AMOUT1 GND1 NC CREG AGCAMIN AGCAM TCONST NC NC GND AGC1 AGC2 VREF2 AMIN Table 2-1. Pin Description QFN24 Pin Symbol Function 1 NC 2 GND Ground FM 3 AGC1 AGC output for pin diode 4 AGC2 AGC output for pin diode 5 VREF2 Reference voltage for pin diode 6 AMIN AM input, impedance matching 7 NC Pin must not be connected to any other pin or supply chain except GND. Pin must not be connected to any other pin or supply chain except GND. 8 CREG 9 AGCAMIN AM - AGC time constant capacitance 2 10 AGCAM AM - AGC output for pin diode 11 TCONST AM - AGC - time constant capacitance 1 AM - AGC input 12 NC 13 GND1 Pin must not be connected to any other pin or supply chain except GND. 14 AMOUT1 15 VREF4 16 AGCCONST 17 VS Supply voltage 18 NC Pin must not be connected to any other pin or supply chain except GND. 19 AGCIN 20 FMOUT 21 GND2 22 FMGAIN 23 FMIN 24 VREF1 Paddle GND Ground AM AM output, impedance matching Bandgap FM AGC time constant FM AGC input FM output Ground FM gain adjustment FM input Reference voltage 2.7V Ground Paddle 3 4913J–AUDR–10/09 Figure 2-2. Pinning SSO20 FMGAIN FMIN VREF1 GND AGC1 AGC2 VREF2 AMIN1 CREG AGCAMIN Table 2-2. 4 1 2 3 4 5 6 7 8 9 10 20 19 18 17 16 15 14 13 12 11 GND2 FMOUT AGCIN VS AGCCONST VREF4 AMOUT1 GND1 TCONST AGCAM Pin Description SSO20 Pin Symbol Function 1 FMGAIN FM gain adjustment 2 FMIN 3 VREF1 4 GND FM ground 5 AGC1 AGC output for PIN diode 6 AGC2 AGC output for PIN diode 7 VREF2 Reference voltage for PIN diode 8 AMIN1 AM input, impedance matching 9 CREG AM AGC constant capacitance 2 10 AGCAMIN FM input Reference voltage 2.7V AM input, AM AGC 11 AGCAM AM AGC output for PIN diode 12 TCONST AM AGC constant capacitance 1 13 GND1 14 AMOUT1 AM ground AM output, impedance matching 15 VREF4 16 AGCCONST Band gap 6V 17 VS Supply voltage 18 AGCIN FM AGC input 19 FMOUT FM output 20 GND2 FM ground FM AGC constant ATR4251 4913J–AUDR–10/09 ATR4251 3. Functional Description The ATR4251 is an integrated AM/FM antenna impedance matching circuit. It compensates cable losses between the antenna (for example windshield, roof, or bumper antennas) and the car radio which is usually placed far away from the antenna. AM refers to the long wave (LW), medium wave (MW) and short wave (SW) frequency bands (150 kHz to 30 MHz) that are usually used for AM transmission, and FM means any of the frequency bands used world-wide for FM radio broadcast (70 MHz to 110 MHz). Two separate amplifiers are used for AM and FM due to the different operating frequencies and requirements in the AM and FM band. This allows the use of separate antennas (for example, windshield antennas) for AM and FM. Of course, both amplifiers can also be connected to one antenna (for example, the roof antenna). Both amplifiers have automatic gain control (AGC) circuits in order to avoid overdriving the amplifiers under large-signal conditions. The two separate AGC circuits prevent strong AM signals from blocking FM stations, and vice versa. 3.1 AM Amplifier Due to the long wavelength in AM bands, the antennas used for AM reception in automotive applications must be short compared to the wavelength. Therefore these antennas do not provide 50Ω output impedance, but have an output impedance of some pF. If these (passive) antennas are connected to the car radio by a long cable, the capacitive load of this cable (some 100 pF) dramatically reduces the signal level at the tuner input. In order to overcome this problem, ATR4251 provides an AM buffer amplifier with low input capacitance (less than 2.5 pF) and low output impedance (5Ω). The low input capacitance of the amplifier reduces the capacitive load at the antenna, and the low impedance output driver is able to drive the capacitive load of the cable. The voltage gain of the amplifier is close to 1 (0 dB), but the insertion gain that is achieved when the buffer amplifier is inserted between antenna output and cable may be much higher (35 dB). The actual value depends, of course, on antenna and cable impedance. The input of the amplifier is connected by an external 4.7 MΩ resistor to the bias voltage (pin 7, SSO20) in order to achieve high input impedance and low noise voltage. AM tuners in car radios usually use PIN diode attenuators at their input. These PIN diode attenuators attenuate the signal by reducing the input impedance of the tuner. Therefore, a series resistor is used at the AM amplifier output in the standard application. This series resistor guarantees a well-defined source impedance for the radio tuner and protects the output of the AM amplifier from short circuit by the PIN diode attenuator in the car radio. 5 4913J–AUDR–10/09 3.2 AM AGC The IC is equipped with an AM AGC capability to prevent overdriving of the amplifier in case the amplifier operates near strong antenna signal level, for example, transmitters. The AM amplifier output AMOUT1 is applied to a resistive voltage divider. This divided signal is applied to the AGC level detector input pin AGCAMIN. The rectified signal is compared against an internal reference. The threshold of the AGC can be adjusted by adjusting the divider ratio of the external voltage divider. If the threshold is reached, pin AGCAM opens an external transistor which controls PIN diode currents and limits the antenna signal and thereby prevents overdriving the AM amplifier IC. 3.3 FM Amplifier The FM amplifier is realized with a single NPN transistor. This allows use of an amplifier configuration optimized on the requirements. For low-cost applications, the common emitter configuration provides good performance at reasonable bills of materials (BOM) cost(1). For high-end applications, common base configuration with lossless transformer feedback provides a high IP3 and a low noise figure at reasonable current consumption(2). In both configurations, gain, input, and output impedance can be adjusted by modification of external components. The temperature compensated bias voltage (VREF1) for the base of the NPN transistor is derived from an integrated band gap reference. The bias current of the FM amplifier is defined by an external resistor. Notes: 1. See test circuit (Figure 8-1 on page 11) 2. See application circuit (Figure 9-1 on page 12) 3.4 FM/TV AGC The IC is equipped with an AGC capability to prevent overdriving the amplifier in cases when the amplifier is operated with strong antenna signals (for example, near transmitters). It is possible to realize an external TV antenna amplifier with integrated AGC and external RF transistor. The bandwidth of the integrated AGC circuit is 900 MHz. FM amplifier output FMOUT is connected to a capacitive voltage divider and the divided signal is applied to the AGC level detector at pin AGCIN. This level detector input is optimized for low distortion. The rectified signal is compared against an internal reference. The threshold of the AGC can be adjusted by adjusting the divider ratio of the external voltage divider. If the threshold is reached, pin AGC1 opens an external transistor which controls the PIN diode current, this limits the amplifier input signal level and prevents overdriving the FM amplifier. 6 ATR4251 4913J–AUDR–10/09 ATR4251 4. Absolute Maximum Ratings Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. This is a stress rating only and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. Reference point is ground (pins 4 and 13 for SSO20 and pins 2, 13, 21 and Paddle for QFN24 package). Parameters Symbol Value Unit Supply voltage VS 12 V Power dissipation, Ptot at Tamb = 90°C Ptot 550 mW Tj 150 °C Ambient temperature SSO20 package Tamb –40 to +90 °C Ambient temperature QFN24 package Tamb –40 to +105 °C Junction temperature Tstg –50 to +150 °C ESD HMB All pins ±2000 V ESD MM All pins ±200 V Storage temperature 5. Thermal Resistance Parameters Symbol Value Unit Junction ambient, soldered on PCB, dependent on PCB Layout for SSO 20 package RthJA 92 K/W Junction ambient, soldered on PCB, dependent on PCB Layout for QFN package RthJA 40 K/W 6. Operating Range Parameters Symbol Min. Typ. Max. Unit VS 8 10 11 V Ambient temperature SSO20 package Tamb –40 +90 °C Ambient temperature QFN 24 package Tamb –40 +105 °C Supply voltage 7 4913J–AUDR–10/09 7. Electrical Characteristics See Test Circuit, Figure 8-1 on page 11; VS = 10V, Tamb = 25°C, unless otherwise specified. Pin numbers in () are referred to the QFN package. No. Parameters 1.1 Supply currents 1.2 Reference voltage 1 output 1.3 Reference voltage 2 output 1.4 Reference voltage 4 output 2 Test Conditions Ivref1 = 1 mA Ivref4 = 3 mA Pin Symbol Min. Typ. Max. Unit Type* 17 (17) IS 11 14 17 mA A 3 (24) VRef1 2.65 2.8 2.95 V A 7 (5) VRef2 0.38 VS 0.4 VS 0.42 VS V B 15 (15) VRef4 6.0 6.25 6.5 V A 2.7 pF D 40 nA C Ω D AM Impedance Matching 150 kHz to 30 MHz (The Frequency Response from Pin 8 to Pin 14) 2.1 Input capacitance f = 1 MHz 8 (6) 2.2 Input leakage current Tamb = 85°C 8 (6) 2.3 Output resistance 14 (14) ROUT 4 5 8 Voltage gain f = 1 MHz 8/14 (6/14) A 0.94 0.97 1 2.5 Output noise voltage (rms value) Pin 14 (14), R78 = 4.7 MΩ, B = 9 kHz, CANT = 30 pF 150 kHz 200 kHz 500 kHz 1 MHz –8 –9 –11 –12 –6 –7 –9 –10 dBµV dBµV dBµV dBµV C 2.6 2nd harmonic Vs = 10V, 50Ω load, fAMIN = 1 MHz, input voltage = 120 dBµV AMOUT1 –60 –58 dBc C 2.7 3rd harmonic Vs = 10V, 50Ω load, fAMIN = 1 MHz, input voltage = 120 dBµV AMOUT1 –53 –50 dBc C kΩ D 2.4 3 14 CAMIN 2.2 VN1 VN2 VN3 VN4 2.45 A AM AGC 10 (9) RAGCAMIN 40 50 f = 1 MHz 10 (9) CAGCAMIN 2.6 3.2 3.8 pF D AGC input voltage threshold f = 1 MHz 10 (9) VAMth 75 77 79 dBµV B 3.4 3 dB corner frequency AGC threshold increased by 3 dB MHz D 3.5 Minimal AGCAM output ViHF = 90 dBµV at pin voltage 10 (9) 10/11 (9/10) VAGC VS – 2.4 VS – 2.1 V A 3.6 Maximal AGCAM output ViHF = 0V at pin 10 (9) voltage 10/11 (9/10) VAGC VS – 0.2 VS – 0.1 V A 3.7 Maximal AGCAM output ViHF = 0V at pin 10 (9) voltage(1) T = +85°C 10/11 (9/10) VAGC VS – 0.4 VS – 0.3 V C 3.8 Maximum AGC sink current 12 (11) IAMsink –150 –120 µA A 3.1 Input resistance 3.2 Input capacitance 3.3 ViHF = 0V at pin 10 (9) U (pin 12 (11)) = 2V 10 VS – 1.7 –90 *) Type means: A = 100% tested, B = 100% correlation tested, C = Characterized on samples, D = Design parameter Notes: 1. Leakage current of PIN diode can be adjusted by an external resistor between pin 11 and VS 2. Demo board measurements (see Figure 8-1 on page 11 “Common Emitter Configuration”) 3. Demo board measurements (see Figure 9-1 on page 12 “Common Base Configuration”) 8 ATR4251 4913J–AUDR–10/09 ATR4251 7. Electrical Characteristics (Continued) See Test Circuit, Figure 8-1 on page 11; VS = 10V, Tamb = 25°C, unless otherwise specified. Pin numbers in () are referred to the QFN package. No. Parameters Test Conditions Pin Symbol 3.9 Transconductance of Level detector ViHF = VAMth at pin 10 (9) 10/12 (9/11) I AM sin k ------------------V AMth 3.10 IP3 at level detector input Figure 9-2 on page 13, 1 MHz and 1,1MHz, 120 dBµV 10 (9) 3.11 PIN diode current generation d(20 log IPin-diode) / dUPin12 T = 25°C, UPin12 = 2V 3.12 Output resistance 4 FM Amplifier 4.1 Emitter voltage 9 (8) Min. 150 ROUT 1 (22) Typ. Max. Unit Type* 20 µA ---------------mV rms C 170 dBµV D 30 dB/V D 27 35 45 kΩ D 1.85 1.95 2.05 V A 1.8 2.0 2.2 V C 37 mA D Vpp D 4.2 Emitter voltage T = –40°C to +85°C 1 (22) 4.3 Supply current limit Rε = 56Ω 19 (20) 4.4 Maximum output voltage VS = 10V 19 (20) 4.5 Input resistance f = 100 MHz 2 (23) RFMIN 50 Ω D 4.6 Output resistance f = 100 MHz 19 (20) RFMOUT 50 Ω D 4.7 Power gain(2) f = 100 MHz FMOUT/ FMIN G 5 dB A 4.8 Output noise voltage (emitter circuit)(2) f = 100 MHz, B = 120 kHz 19 (20) VN –5.1 dBµV D 4.9 OIP3 (emitter circuit)(2) f = 98 + 99 MHz 19 (20) IIP3 140 dBµV C 4.10 I19 12 (3) Gain 4.11 Noise figure 4.12 OIP3(3) (3) f = 98 + 99 MHz 6 dB C 2.8 dB C 148 dBµV C dBµV dBµV B B Parameters Dependent of External Components in Application Circuit: RFMIN, RFMOUT, G, VN, IIP3 5 FM AGC 81 81 83 85 85 87 5.1 AGC threshold f = 100 MHz f = 900 MHz 18 (19) Vth1,100 Vthl,900 5.2 AGC1 output voltage AGC1 active, Vpin16 (16) = 5V 5 (24) VAGC VS – 2.1V VS – 1.9V VS – 1.7V V C 5.3 AGC1 output voltage AGC1 inactive, Vpin16 (16) = 1.7V 5 (24) VAGC VS – 0.2V VS V C 5.4 AGC2 output voltage AGC2 active, Vpin16 (16) = 1.7V 6 (4) VAGC VS – 2.1V VS – 1.9V VS – 1.7V V C 5.5 AGC2 output voltage AGC2 inactive, Vpin16 (16) = 5V 6 (4) VAGC VS – 0.2V VS V C 5.6 Input resistance 18 (19) RPin18 17 21 kΩ D 25 *) Type means: A = 100% tested, B = 100% correlation tested, C = Characterized on samples, D = Design parameter Notes: 1. Leakage current of PIN diode can be adjusted by an external resistor between pin 11 and VS 2. Demo board measurements (see Figure 8-1 on page 11 “Common Emitter Configuration”) 3. Demo board measurements (see Figure 9-1 on page 12 “Common Base Configuration”) 9 4913J–AUDR–10/09 7. Electrical Characteristics (Continued) See Test Circuit, Figure 8-1 on page 11; VS = 10V, Tamb = 25°C, unless otherwise specified. Pin numbers in () are referred to the QFN package. No. Parameters 5.7 Input capacitance 5.8 Test Conditions Pin Symbol Min. Typ. Max. Unit Type* F = 100 MHz 18 (19) CPin18 1.5 1.75 1.9 pF D IP3 at AGC input Figure 9-2 on page 13, 100 MHz and 105 MHz, VGen = 120 dBµV 18 (19) 150 dBµV D 5.9 IP3 at AGC input 900 MHz and 920 MHz VGen = 120 dBµV 18 (19) 148 dBµV D 5.10 Max. AGC sink current ViHF = 0V 5.11 Transconductance ViHF = Vth1,100, dIPin16(16) / dUPin18(19) 5.12 Gain AGC1, AGC2 UPin16 = 3V, dUPin5(3) / dUPin16(16), –dUPin6(4) / dUPin16(16) 16 IPin16 –11 –9 –7 µA C dIPin16 / dUPin18 0.8 1.0 1.3 mA/V (rms) C 0.5 0.56 0.6 C *) Type means: A = 100% tested, B = 100% correlation tested, C = Characterized on samples, D = Design parameter Notes: 1. Leakage current of PIN diode can be adjusted by an external resistor between pin 11 and VS 2. Demo board measurements (see Figure 8-1 on page 11 “Common Emitter Configuration”) 3. Demo board measurements (see Figure 9-1 on page 12 “Common Base Configuration”) 10 ATR4251 4913J–AUDR–10/09 ATR4251 8. Test Circuit FM/AM Figure 8-1. Common Emitter Configuration VS 4.7Ω + 10 µF 100 nF 470 nF AMOUT1 500 pF 5 kΩ AGCIN AGCAM TCONST + + 56Ω 22Ω 2.2 nF AGCAMIN 68Ω 4.7 MΩ 1 µH SSO20 11 9 CREG 8 AMIN1 7 VREF2 6 AGC2 4 GND VREF1 3 Band gap AGC (AM) AM 12 13 GND1 AMOUT1 14 VREF4 1 nF 47Ω1) + AGC FM amplifier FMIN FMGAIN 1 270Ω 2 2.2 nF 17 VS AGCIN 18 19 20 GND2 FMOUT FMOUT 22 pF + 10 4.7 µF 2.2 µF 22 pF 15 150 nH AGCCONST 100 nF 5 10 µF GND 16 + AGC1 4.7Ω 1 µF 10 µF 33 pF 2.2 nF 15 nF Cant 2.2 nF FMIN 220 nF AMINP1 AMAGCIN 50Ω 50Ω (1) Output impedance 50Ω adjustment 11 4913J–AUDR–10/09 9. Application Circuit (Demo Board) Figure 9-1. Common Base Configuration AM/FM_OUT +VS +VS R23 C21 100 nF 2.2 µF 180 nH R24 4.7Ω + C27 10 µF GND C17 L3 C24 R11(2) 10 kΩ 470 nF C31 33 pF 100 nF R20 R21 100Ω T2 BC858 33Ω(1) 2.2 pF (4) L3 470 nH C19 C12 100 nF C20 AM/FM application combined with AM AGC with the following capability 4.7 µF TCONST AM 12 R12(2) 2.2 kΩ AGC (AM) 13 GND1 AMOUT1 14 VREF4 15 AGCCONST 16 VS Band gap 1 pF + 220 nF AGC FM amplifier 1 kΩ 17 AGCIN 18 19 20 GND2 FMOUT 1 pF(4) 2. Testing AM + AM AGC connector AM as input connector AM/FM_OUT as output C28 C33 C13 1 nF C18 1. Testing FM + FM AGC connector FM as input connector AM/FM_OUT as output R3 R10 100Ω SSO20 10 µF C30 100 nF C23 AGCAM 4.7Ω + C26 11 VB+ 10 D3 BA779-2 C29 D1 D2 BA679 BA679 100 nF C1 R7 FM 2.2 pF L1 120 nH (2) C4 22 pF R6 R5 100Ω (2) 10 9 CREG 8 + C7 C32 10 µF C10 RS1 2Ω 220 nF 15 nF R9 C8 10 kΩ(3) BC858 C6 10 nF R25 68Ω 1 µF T1 AM R4 4.7 MΩ C3 R1 47Ω R2 51Ω C5 2.2 nF AMIN1 6 7 VREF2 AGC1 AGC2 5 4 GND 3 +VS AGCAMIN 2.2 nF VREF1 3 FMGAIN 1 C2 FMIN TR1 2.2 nF 2 4 1 6 1 nF R8 3 kΩ(3) C11 100 pF (1) AM Output impedance (50Ω adjustment) (2) Leakage current reduction (3) AM AGC threshold (4) AM AGC threshold 12 ATR4251 4913J–AUDR–10/09 ATR4251 Figure 9-2. Antenna Dummy for Test Purposes OUTPUT 50Ω 1 nF 50Ω Gen AGCIN 13 4913J–AUDR–10/09 10. Internal Circuitry Table 10-1. PIN SSO20 Equivalent Pin Circuits (ESD Protection Circuits Not Shown) PIN QFN24 Symbol Equivalent Circuit 19 1 2 19 22 23 20 FMGAIN FMIN FMOUT 1 2 3 24 VREF1 3 4, 13, 20 2, 13, 21 GND VS 5 6 7 14 3 4 AGC1 AGC2 1, 7, 12, 18 NC 5 VREF2 5 7 ATR4251 4913J–AUDR–10/09 ATR4251 Table 10-1. PIN SSO20 Equivalent Pin Circuits (ESD Protection Circuits Not Shown) (Continued) PIN QFN24 Symbol Equivalent Circuit VS 8 6 AMIN1 8 9 8 CREG 9 10 10 9 AGCAMIN 11 10 AGCAM 11 15 4913J–AUDR–10/09 Table 10-1. Equivalent Pin Circuits (ESD Protection Circuits Not Shown) (Continued) PIN SSO20 PIN QFN24 Symbol 12 11 TCONS Equivalent Circuit 12 14 14 AMOUT1 15 15 VREF4 16 16 AGCCONST 17 17 VS 14 15 16 16 ATR4251 4913J–AUDR–10/09 ATR4251 Table 10-1. Equivalent Pin Circuits (ESD Protection Circuits Not Shown) (Continued) PIN SSO20 PIN QFN24 Symbol 18 19 AGCIN Equivalent Circuit 18 17 4913J–AUDR–10/09 11. Ordering Information Extended Type Number Package Remarks MOQ ATR4251-TKSY SSO20 Sticks 830 pieces ATR4251-TKQY SSO20 Taped and reeled 4000 pieces ATR4251-PFQY QFN24, 4 mm × 4 mm Taped and reeled 6000 pieces ATR4251-PFPY QFN24, 4 mm × 4 mm Taped and reeled 1500 pieces 12. Package Information Figure 12-1. SSO20 5.4±0.2 1.3±0.05 0.05+0.1 0.25±0.05 6.45±0.15 0.65±0.05 0.15±0.05 4.4±0.1 6.75-0.25 5.85±0.05 20 11 Package: SSO20 Dimensions in mm technical drawings according to DIN specifications 1 10 Drawing-No.: 6.543-5056.01-4 Issue: 1; 10.03.04 18 ATR4251 4913J–AUDR–10/09 ATR4251 Figure 12-2. QFN24 Package: QFN 24 - 4 x 4 Exposed pad 2.15 x 2.15 (acc. JEDEC OUTLINE No. MO-220) Dimensions in mm 4 0.9±0.1 2.15±0.15 24 19 1 24 18 1 13 0.4±0.1 0.23±0.07 6 6 12 technical drawings according to DIN specifications 7 0.5 nom. Drawing-No.: 6.543-5086.01-4 Issue: 2; 24.01.03 19 4913J–AUDR–10/09 13. Revision History Please note that the following page numbers referred to in this section refer to the specific revision mentioned, not to this document. Revision No. History 4913J-AUDR-10/09 • Section 11 “Ordering Information” on page 18 changed 4913I-AUDR-03/08 20 • • • • Figure 1-1 “Block Diagram QFN24 Package” on page 1 changed Figure 2-1 “Pinning QFN24” on page 3 changed Table 2-1 “Pin Description QFN24” on page 3 changed Table 10-1 “Equivalent Pin Circuits (ESD Protection Circuits Not Shown) on page 14 changed • Section 11 “Ordering Information” on page 18 changed 4913H-AUDR-10/07 • Section 7 “Electrical Characteristics” numbers 1.1, 1.2, 1.3, 1.4, 2.4, 3.5, 3.6, 4.3 and 5.1 on pages 8 to 9 changed • Section 7 “Electrical Characteristics” numbers 2.8 and 2.9 deleted • Figure 8-1 “Common Emitter Configuration” on page 11 changed 4913G-AUDR-07/07 • Figure 8-1 “Common Emitter Configuration” on page 11 changed • Figure 9-1 “Common Base Configuration” on page 12 changed 4913F-AUDR-06/07 • Put datasheet in a new template • Figure 8-1 “Common Emitter Configuration” on page 11 changed • Figure 8-1 “Common Base Configuration” on page 12 changed 4913E-AUDR-02/07 • • • • • • • • Put datasheet in a new template Figure 1-1 exchanged with figure 1-2 on pages 1 to 2 Figure 2-1 exchanged with figure 2-2 on pages 3 to 4 Table 2-1 exchanged with table 2-2 on pages 3 to 4 Section 3.1 “AM Amplifier” on page 5 changed Section 3.4 “FM AGC” on page 6 renamed in “FM/TV AGC” and changed Section 7 “Electrical Characteristics” on pages 8 to 10 changed Figure 9-1 “Common Base Configuration” on page 12 changed ATR4251 4913J–AUDR–10/09 Headquarters International Atmel Corporation 2325 Orchard Parkway San Jose, CA 95131 USA Tel: 1(408) 441-0311 Fax: 1(408) 487-2600 Atmel Asia Unit 1-5 & 16, 19/F BEA Tower, Millennium City 5 418 Kwun Tong Road Kwun Tong, Kowloon Hong Kong Tel: (852) 2245-6100 Fax: (852) 2722-1369 Atmel Europe Le Krebs 8, Rue Jean-Pierre Timbaud BP 309 78054 Saint-Quentin-en-Yvelines Cedex France Tel: (33) 1-30-60-70-00 Fax: (33) 1-30-60-71-11 Atmel Japan 9F, Tonetsu Shinkawa Bldg. 1-24-8 Shinkawa Chuo-ku, Tokyo 104-0033 Japan Tel: (81) 3-3523-3551 Fax: (81) 3-3523-7581 Technical Support [email protected] Sales Contact www.atmel.com/contacts Product Contact Web Site www.atmel.com Literature Requests www.atmel.com/literature Disclaimer: The information in this document is provided in connection with Atmel products. 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