NJM2204A LOG AMPLIFIER ■ GENERAL DESCRIPTION The NJM2204A is an integrated IF limitting amplifier which contains temperature compensated reference power supply, 6 stage differential limitting amplifier and 6 stage logarithmic suppression circuit. Its votage gain is 58dB and linearity is ±1dB within 50dB log dynamic range. The voltage gain and log dynamic range are enlarged by connecting multiple stages. The NJM2204A is suitable to telecommunication equipment. ■ FEATURES ● Wide log dynamic range ● Wide linearity range ● Large Voltage Gain ● Wide stable operating supply voltage range ● Wide stable operating temperature range ● Package Outline ● Bipolar Technology ■ PACKAGE OUTLINE NJM2204AD (50dB) (±1dB) (60dB) (8 to 12V) (-20 to 85°C) DIP16 ■ APPLICATION ● Cellular ● Personal wireless Radio ● Business wireless Radio ● Handy talky ■ PIN CONFIGURATION Pin No. NJM2204AD NJM2204AD Ver.2003-12-09 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 Pin Name RF IN LOG OUT 1 GND1 VREF1 VCOMP Vst GND2 EXT C2 RF OUT VREF2 LOG OUT 4 LOG OUT 3 + V2 EXT C1 LOG OUT 2 + V1 Function AC Signal Input (C-coupling) LOG Detector Output (from 1st stage) Ground 1 Internal Reference Voltage 1 Compensation Input to Reference Voltage Compensated Output of Reference Voltage Ground 2 Terminate with C Limited AC Output Internal Reference Voltage2 LOG Detector Output (from 6th stage) LOG Detector Output (from 4th and 5th stage) Supply Voltage Input 2 Terminate with C LOG Detector Output (from 2nd and 3rd stage) Supply Voltage Input 1 -1- NJM2204A ■ BLOCK DIAGRAM NJM2204AD (Ta=25°C, V+=9V, VREF=6.0V) ■ LOG DETECTOR OUTPUT CHARACTERISTICS(EXAMPLE) PARAMETER Log Detector Output TEST CONDITION fIN=455kHz, VIN=8dB (50Ω termination) fIN=455kHz, VIN=-2dB (50Ω termination) fIN=455kHz, VIN=-12dB (50Ω termination) fIN=455kHz, VIN=-22dB (50Ω termination) fIN=455kHz, VIN=-32dB (50Ω termination) fIN=455kHz, VIN=-42dB (50Ω termination) fIN=455kHz, VIN=-52dB (50Ω termination) fIN=455kHz, VIN=-62dB (50Ω termination) MIN. TYP. MAX. UNIT 0.976 0.868 0.727 0.586 0.446 0.305 0.164 0.057 1.004 0.896 0.755 0.614 0.474 0.333 0.192 0.085 1.032 0.924 0.783 0.642 0.502 0.361 0.202 0.113 V V V V V V V V - ±1 dB Log Detector Linearity Ta=-20°C to 85°C, VIN=-2 to -52dBm * Log Detection Linearity : It is error between RF input level and ideal input level to straight line connected two detection output points of two input level (-2dBm, -52dBm). * Temperature coefficient of Log detection output voltage : approximately 90µV / °C Typ. (-20 to +85°C). ■ TEST CIRCUIT -2- Ver.2003-12-09 NJM2204A ■ RECOMMENDED OPERATING CONDITION PARAMETER (Ta=-20 to 85°C) SYMBOL MIN. TYP. MAX. UNIT V 8.0 9.0 16.0 V BRFO 1 2 - kΩ BLOGO 100 - - kΩ VVR - 6.0 - V + Operating Voltage Output Load Impedance Stabilized Voltage ■ ABSOLUTE MAXIMUM RATINGS PARAMETER SYMBOL + Supply Voltage V Input Voltage RATING UNIT -0.5 to 16.0 V + VIN -0.5 to V ILR 5 mA IRFO 2 mA Operating Temperature Topr -20 to 85 °C Storage Temperature Tstg -55 to 125 °C Output Current V (note):The NJM2204A is produced by high frequency wafer process and so destrutcive voltage against surge pulse is lower than low frequency product. (Ta=25°C, V+=9V, VREF=6.0V) ■ ELECTRICAL CHARACTERISTICS PARAMETER SYMBOL TEST CONDITION MIN. TYP. MAX. UNIT Operating Current ICC - 6 10.0 mA Maximum Operating Frequency fmax 0.5 3 - MHz Output Voltage Swing VRFO Input : +8dBm (50Ω termination) - 2.0 - VP-P Log Detection Output VLOG Input : +8dBm (50Ω termination) - 1.0 - V VIN=-2dBm to -52dBm (50Ω termination) - - ±1 dB 60 - - dB Log Detection Linearity LIN Limitter Amp Gain GV Ver.2003-12-09 -3- NJM2204A ■ TYPICAL CHARACTERISTICS Operating Current vs. Operating Voltage Limitter Amp Gain Log Detector Output Log Detector Output Log Detector Output VR -4- Ver.2003-12-09 NJM2204A ■ TYPICAL APPLICATION & CHARACTERISTICS (10 synthesized stage) Log Det Output Voltage [CAUTION] The specifications on this databook are only given for information , without any guarantee as regards either mistakes or omissions. The application circuits in this databook are described only to show representative usages of the product and not intended for the guarantee or permission of any right including the industrial rights. Ver.2003-12-09 -5-