NJU7907A Monaural Microphone Amplifier ■ GENERAL DESCRIPTION ■ PACKAGE OUTLINE The NJU7907A is a monaural microphone amplifier IC including regulator for microphone capcel, pre-amplifier and line amplifier. The NJU7907A features low consumption current, wide dynamic range, wide operating voltage range, wide operating temperature and urtla small and thin package. It is suitable for microphone module, headset for conference system, automotive microphone for eCall, and any portable applications. NJU7907AUC4 ■ FEATURES ● Operating Voltage ● Low Consumption Current ● Wide Dynamic Range ● Wide Operating Temperature ● CMOS Technology ● Package Outline 4.5 to 16V EPFFP10-C4 ■ BLOCK DIAGRAM NF V S=8V V+ RL SIGOUT Iref Gen LINEOUT PREIN GND MIC PREOUT LINEIN BIAS CCUP Ver.0.7E RBIAS FB RFB1 RFB2 -1- NJU7907A ■ PIN CONFIGURATION 7 1 6 8 5 10 3 9 4 9 4 10 3 8 5 1 2 7 Top View -2- 2 No. SYMBOL 1 PREOUT 2 PREIN 3 NF 4 GND 5 LINEOUT 6 NC + 6 Bottom View FUNCTION Pre-Amplifier Output Terminal Pre-Amplifier Input Terminal Noise Filter Terminal Ground Terminal Line Amplifier Output Terminal No Connect 7 V Power Supply Terminal 8 FB Line Amplifier Feedback Terminal 9 LINEIN 10 BIAS Line Amplifier Input Terminal Reference Current Setting Terminal NJU7907A ■ ABSOLUTE MAXIMUM RATING (Ta=25°C) PARAMETER SYMBOL + RATING UNIT 18 340 V Supply Voltage V Power Dissipation PD NOTE: EIA/JEDEC STANDARD Test board (76.2x114.3x1.6mm, 2layer, FR-4) mounting Vimax 0.3 Vrms Operating Temperature Range Topr -40 to +85 °C Storage Temperature Range Tstg -40 to +125 °C Maximum Input Voltage mW ■ ELECTRICAL CHARACTERISTICS (Ta=25°C, VS=8V, GV=37.8dB, f=1kHz unless otherwise specified) ♦DC CHARACTERISTICS (Rg=0Ω, RL=680Ω unless otherwise specified) PARAMETER SYMBOL TEST CONDITION MIN. TYP. MAX. UNIT 4.5 8.0 16.0 V Operating Voltage VS Supply Current1 IDD1 No Signal - 4.85 6.0 mA Supply Current2 IDD2 RFB1=0Ω,RFB2=∞ - 220 320 µA Supply Current3 IDD3 RL=0Ω - 28.0 50.0 mA Reference Current Iref No Signal 8.0 9.0 10.0 µA Output DC Voltage VOUT - 4.7 - V MIN. TYP. MAX. UNIT No Signal, LINEOUT ♦PreAmp CHARACTERISTICS (CIN=1nF, RL=100kΩ unless otherwise specified) PARAMETER SYMBOL TEST CONDITION Voltage Gain Gv Vin=50mVrms -0.8 -0.5 -0.2 dB Frequency Response ∆Gf 1kHz-10kHz -0.5 0 0.5 dB - 1.0 - pF 200 - - MΩ - 0.1 0.5 % - -108 - dBV - -112 - dBV - -68 -63 dBV - -73 -68 dBV MIN. TYP. MAX. UNIT Input Capacitance Ci Input Resistance Ri Total Harmonic Distortion THD Output Noise Voltage 1 VNO1 Output Noise Voltage 2 VNO2 Output Noise Voltage 3 VNO3 Output Noise Voltage 4 VNO4 Vin=100mVrms BW=400Hz to 30kHz Weighted-A, CNF=None Weighted-A, CNF=1nF PREIN -> LINEOUT Weighted-A, CNF=None PREIN -> LINEOUT Weighted-A, CNF=1nF ♦ LineAmp CHARACTERISTICS (Rg=0Ω, RL=680Ω unless otherwise specified) PARAMETER SYMBOL TEST CONDITION Maximum Output Voltage VOM OUTPUT, THD=3% 1.8 2.1 - Vrms Voltage Gain GV Vin=10mVrms Vo=1.6Vrms BW=400Hz to 30kHz Weighted-A 37.3 37.8 38.3 dB - 0.1 0.5 % - -78 -72 dBV Total Harmonic Distortion THD Output Noise Voltage VNO Output Resistance Ro - 5 10 Ω Input Resistance Ri 60 100 130 kΩ Ripple Rejection RR 25 40 - dB VRipple=0.5Vrms PREIN→LINEOUT -3- NJU7907A ■ MEASUREMENT CIRCUIT 1. DC Characteristics V S=8V IDD1,IDD3 A NF IDD2 680 V+ ON :IDD3 A OFF :IDD1, IDD2 Iref Gen V LINEOUT PREIN VOUT GND 1n PREOUT LINEIN 22n BIAS FB 6.8k 390 30k 2. Pre-Amplifier Characteristics 1n OFF :VNO1 V S=8V NF V+ 680 Iref Gen LINEOUT PREIN GND 1n Vin ~ PREOUT LINEIN BIAS 22n ~ FB 22n V 6.8k 100k 390 30k Vout 3. Line Amplifier Characteristics NF V S=8V V+ 680 Iref Gen LINEOUT PREIN V ~ GND PREOUT LINEIN BIAS Vout FB 22n Vin 6.8k 390 30k ~ 4. Ripple Rejection Characteristics NF V+ 680 SIGOUT ~ VRipple Iref Gen LINEOUT PREIN GND 1n PREOUT 22n -4- LINEIN BIAS FB 6.8k 390 30k V ~ 8V Vout NJU7907A ■ TERMINAL DESCRIPTION No. SYMBOL FUNCTION EQUIVALENT CIRCUIT VOLTAGE V+ 1 PREOUT Pre-Amplifier Output Terminal 0.7V 100 PREOUT 2 PREIN Pre-Amplifier Input Terminal 0V 400 PREIN V+ 3 NF Noise Filter 620k 1.2V 400 NF 12k V+ 4 GND 7 V+ 0V Ground Terminal 4.7V Power Supply Terminal GND LINEOUT 200 5 LINEOUT Line Amplifier Output Terminal 4.7V -5- NJU7907A V+ 8 FB 9 LINEIN 60mV Line Amplifier Feedback Terminal BIAS LINEIN 10 -6- BIAS 100k Line Amplifier Input Terminal Reference Current Setting Terminal 400 60mV 400 FB 60mV NJU7907A ■ APPLICATION CIRCUIT (GV=37.8dB) 1n NF V S=8V V+ 680 SIGOUT Iref Gen LINEOUT PREIN GND MIC PREOUT LINEIN 22n BIAS FB 6.8k 390 30k (GV=23.9dB) 1n NF V S=8V V+ 680 SIGOUT Iref Gen LINEOUT PREIN GND MIC PREOUT LINEIN 22n BIAS FB 30k 1.8k 30k -7- NJU7907A ■ APPLICATION NOTE VS NF VS V+ Vhsat RL SIGOUT LINEOUT Iref Gen PREIN MIC Output Voltage range GND Output DC Voltage PREOUT LINEIN BIAS FB Vlsat CCUP Iref RFB2 RBIAS RFB1 I RF GND Design Note: 1. Feeding resistor RL range is 600Ω to 2.2kΩ. Set by Operating Voltage and other electrical characteristics. 2. Output DC Voltage is set by RBIAS. VR is Voltage of RBIAS. VR= (RFB1/(RFB1+RFB2))•Vout RBIAS= VR/Iref Vout : Output DC voltage Iref : reference Current Output DC Voltage is calculated with Output voltage range. (See Note.4) 3. Total Gain is determined with Gv= 20Log(RFB1+RFB2)/ RFB1) [dB] Voltage gain range is 24dB to 40dB [@1kHz] 4. Output Voltage range is determined with DCRANGE=VS - (Vhsat+Vlsat) Vhsat : High side Minimum Saturation Voltage Vhsat =(IDD2+IRF) •RL IRF : Current for feedback resistor.[RFB1,RFB2] IRF=Vo/(RFB1+RFB2) Vo= Output DC Voltage Vlsat : Low side Minimum Saturation Voltage (approximately 1.8V @25deg.) ex. VS=8V, Vo=4.7V, RL=680Ω, RFB1=390Ω, RFB2=30kΩ, Vlsat=1.8V IRF=4.7V/(390Ω+30kΩ)=154.7uA Vhsat =(220µA+154.7µA) •680=254.8mV DCRANGE=8V-(254.8mV +1.8V)=5.95VP-P. -8- NJU7907A 5. Supply Current. IDD1=(VS - VOUT)/RL RL: Feeding Resistor. 6. Maximum Load Capacitance CLmax <1,000pF 7. Cut off frequency is determined with fc=1/(2π•CCUP(RIN+RBIAS) RIN :Line Amp Input Resistance=100kΩ -9- NJU7907A ■Package Dimension. [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. - 10 -