Stereo Headphone Amplifier & Audio Line Amplifier IC. +8.5dB Amplifier 1. f=48khz ±20% +8.5dB Amplifier dB Amplifier 2.

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1 Stereo Headphone Amplifier & Audio Line Amplifier IC!GENERAL DESCRIPTION The NJM2774 is a headphone amplifier and 2channel audio line amplifier IC. Each amplifier has a fixed Gain. Therefore, it is connectable directly to operating device without input coupling capacitor. The headphone amplifier and one of audio line amplifier (Amplifier 2) include Lowpass filter for PWM input signal. Further, another audio line amplifier (Amplifier 3) corresponds both singleend input and differential input. Also, it includes 3circuit voltage detector and mute transistor control circuit. The NJM2774 is suitable for audio applications with a headphone and audio line outputs.!package NJM2774V!FEATURE "Headphone Amplifier "2channel Audio Line Amplifier 48kHz LPF +8.5dB Fixed Gain Amplifier 2 : 48kHz LPF, +11dB Fixed Gain Amplifier 3 : +9dB Fixed Gain =11.4 to 20V, =8.5 to V "Operating Voltage "Operating Current 10mA typ. ( ), 6mA typ. ( ) "Voltage Detector (3 Circuits) "Mute transistor control circuit "Bipolar Technology "Package Outline!BLOCK DIAGRAM SSOP32 LPF +8.5dB Amplifier 1 HPAmp. LPF +8.5dB Amplifier 1 HPAmp. LPF +11dB Amplifier 2 LineAmp. LPF +11dB Amplifier 2 LineAmp. +9dB Amplifier 3 LineAmp. +9dB Amplifier 3 LineAmp. REG. DET. Mute Tx Control 1

2 !PIN CONFIGURATION No. Symbol Function No. Symbol Function 1 Power Supply 1 17 X_PROTECT Logic Output for Detector 2 Power Supply 2 18 X_MUTEC IN Logic Input C for Mute Control of Amplifier Output 3 REG IN External Reference Voltage Input 19 RECMUTE Logic Output C for Mute Control of 4 REG External Reference Voltage Output 20 RECR Rch Line Amplifier2 REC Output RECL Lch Line Amplifier2 REC Output 6 HPL IN Lch Headphone Amplifier Input 22 LINEMUTE Logic Output B for Mute Control of 7 HPR IN Rch Headphone Amplifier Input 23 LINER Rch Line Amplifier1 REC Output 8 REF Reference Voltage 1.6V 24 LINEL Lch Line Amplifier1 REC Output 9 LINEL IN Lch Line Amplifier1 Input 25 HPMUTE Logic Output A for Mute Control of 10 LINER IN Rch Line Amplifier1 Input 26 HPR Rch Headphone 11 RECL IN Lch Line Amplifier2 REC () Input 27 HPL Lch Headphone 12 RECL IN+ Lch Line Amplifier2 REC (+) Input 28 SPR() IN Rch Speaker Amplifier Input 13 RECR IN+ Rch Line Amplifier2 REC (+) Input 29 SPR(+) IN Rch Speaker Amplifier + Input 14 RECR IN Rch Line Amplifier2 REC () Input 30 SPL() IN Lch Speaker Amplifier Input 15 X_MUTEA IN 16 X_MUTEB IN Logic Input A for Mute Control of Amplifier Output Logic Input B for Mute Control of Amplifier Output 31 SPL(+) IN Lch Speaker Amplifier + Input 32 External Reference Voltage Input 0V 2

3 ! ABSOLUTE MAXIMUM RATING(Ta=25 C) PARAMETER SYMBOL RATING UNIT Supply Voltage V V Maximum Input Voltage V IM 0.3 to ( * ) V Power Dissipation P D 1200 NOTE: EIA/JEDEC STANDARD Test board (76.2x114.3x1.6mm, 2layer, FR4) mounting Operating Temperature Range Topr Storage Temperature Range Tstg W ( * ) For the maximum input voltage less than 0.3 to!electrical CHARACTERISTICS ( =15V, =9V, Ta=25 C, unless otherwise specified) PARAMETER SYMBOL TEST CONDITION MIN. TYP. MAX. UNIT GENERATIONAL CHARACTERISTICS Operating Voltage V Operating Voltage V Operating Current 1 I CC1 =15V, No Load, No Signal ma Operating Current 2 I CC2 =9V, No Load, No Signal 6 10 ma Cross Talk CT Rg=2.2kΩ, Vin=1.6V(), Vo=1Vrms, f=1khz, BPF:400Hz to 30kHz AMPLIFIER 1 HEADPHONE AMPLIFIER ( =9V, Ta=25 C, unless otherwise specified) 70 db Input Voltage 1 V I V Output Voltage 1 V O1 Vin=1.6V() 4.26 V Voltage Gain 1 Maximum Output Voltage1 Output Noise 1 Total Harmonic Distortion 1A Total Harmonic Distortion 1B Channel Separation 1 G V1 V OM1 V NO1 THD 1A THD 1B CS1 Vin=1.6V(), Vin=0.2Vrms, f=1khz, R L =100Ω =8.75V, Vin=1.57 to 1.725V(), THD=1%, f=1khz, BPF:400Hz to 30kHz, R L =100Ω Rg=2.2k Ω, Vin=1.6V(), BPF:400Hz to 30kHz Vin=1.6V(), Vin=0.2Vrms, f=1khz, BPF:400Hz to 30kHz, R L =100Ω =8.75V, Vin=1.65V(), Vo=2.2Vrms, f=1khz, BPF:400Hz to 30kHz, R L =100Ω Rg=2.2kΩ, Vin=1.6V(), Vo=1Vrms, f=1khz, BPF:400Hz to 30kHz db Vrms 90 (31.6) 97 (14.1) dbv (µvrms) 0.02 % % 70 db LPF Characteristics 1 LPF 1 3dB 48 khz Input Impedance 1 R IN kω AMPLIFIER 2 LINE AMPLIFIER ( =15V, Ta=25 C, unless otherwise specified) Input Voltage 2 V I V Output Voltage 2 V O2 Vin=1.6V() 5.68 V Voltage Gain 2 Maximum Output Voltage2 Output Noise 2 Total Harmonic Distortion 2A Total Harmonic Distortion 2B Channel Separation 2 G V2 V OM2 V NO2 THD 2A THD 2B CS2 Vin=1.6V(), Vin=0.2Vrms, f=1khz, R L = Vin=1.57 to 1.725V(), THD=1%, f=1khz, BPF:400Hz to 30kHz, R L = Rg=2.2k, Vin=1.6V(), BPF:400Hz to 30kHz Vin=1.6V(), Vin=0.2Vrms, f=1khz, BPF:400Hz30kHz, R L = =11.4V, Vin=1.65V(), Vo=3.0Vrms, f=1khz, BPF:400Hz to 30kHz, R L = Rg=2.2kΩ, Vin=1.6V(), Vo=1Vrms, f=1khz, BPF:400Hz to 30kHz db Vrms 90 (31.6) 95 (17.8) dbv (µvrms) 0.02 % % 70 db LPF Characteristics 2 LPF 2 3dB 48 khz Input Impedance 2 R IN kω 3

4 !ELECTRICAL CHARACTERISTICS ( =15V, =9V, Ta=25 C, unless otherwise specified) PARAMETER SYMBOL TEST CONDITION MIN. TYP. MAX. UNIT AMPLIFIER 3 LINE AMPLIFIER ( =15V, Ta=25 C, unless otherwise specified) Input Voltage 3 V I V Output Voltage 3 V O3 Vin=1.5V() 5.84 V Voltage Gain 3 Maximum Output Voltage3 Output Noise 3 Total Harmonic Distortion 3A Total Harmonic Distortion 3B Channel Separation 3 Common Mode Rejection Ratio G V3 V OM3 V NO2 THD 3A THD 3B CS3 Vin=1.5V(), Vin=0.2Vrms, f=1khz, R L = Vin=1.5V(), THD=1%, f=1khz, BPF:400Hz to 30kHz, R L = Rg=2.2kΩ, Vin=1.6V(), BPF:400Hz to30khz Vin=1.5V(), Vin=0.2Vrms, f=1khz, BPF:400Hz to 30kHz, R L = =11.4V, Vin=1.5V(), Vo=2.8Vrms, f=1khz, BPF:400Hz to 30kHz, R L = Rg=2.2kΩ, Vin=1.5V(), Vo=1Vrms, f=1khz, BPF:400Hz to 30kHz db Vrms 90 (31.6) 95 (17.8) dbv (µvrms) 0.02 % % 70 db CMRR 35 db Input Impedance 3 R IN kω CONTROL CHARACTERISTICS Detection Voltage 1 V DET1 Release Voltage Detection Voltage 2 V DET2 Release Voltage V DET1 V DET1U V DET2 V DET2U Detection Voltage : "VDET1 < Listed Value X_MUTE Current : ON, X_PROTECT Voltage : LOW Detection Voltage : "VDET1U > Listed Value X_MUTE Current : OFF, X_PROTECT Voltage : HIGH Detection Voltage : "VDET2 < Listed Value X_MUTE Current : ON X_PROTECT Voltage : LOW Detection Voltage : "VDET2U > Listed Value X_MUTE Current : OFF, X_PROTECT Voltage : HIGH V 11.4 V V 8.5 V Detection Voltage 3 V DET3 Detection Voltage : SP(+) SP() "VDET3 < Listed Value 0.7 V X_PROTECT Voltage : LOW REG Voltage V REG REGIN=, Io=10mA V X_PROTECT Output Voltage : H V OPROH Logic Output : High, R L =1MΩ V X_PROTECT Output Voltage : L V OPROL Logic Output : Low, R L =1MΩ V X_MUTE Logic Output : High, V Output Voltage : H OMUTEH V pullup =, R pullup= 2.8 V X_MUTE Logic Output : Low, V Output Voltage : L OMUTEL V pullup =, R pullup= V X_MUTE IN Input Voltage : H V IMUTEH Logic Input : High V X_MUTE IN Input Voltage : L V IMUTEL Logic Input : Low V Note1 : In case of initial condition after turn ON X_MUTE Output Current : ON (After turn ON, release the detection by changing the V IMUTE level from "LOW" to "HIGH".) X_PROTECT : HIGH Note2 : In case of any condition V DET1 >, V DET2 >, or V IMUTE = LOW All X_MUTE Output Current : ON (X_MUTE terminal voltage is 1.75V on the measurement circuit [V pullup =, R pullup=] ) : In case of any condition V DET1 >, V DET2 >, or V DET3 < SP(+) SP() X_PROTECT : LOW 4

5 ! TERMINAL DESCRIPTION PIN NO. SYMBOL FUNCTION EQUIVALENT CIRCUIT VOLTAGE 1 2 Power Supply 1 Power Supply 2 12kΩ 11.4 to 20V 8.5 to V 3 REG IN External Reference Voltage Input 4 REG External Reference Voltage Output 10Ω 10Ω REG IN 6 7 HPL IN HPR IN Lch Headphone Amplifier Input Rch Headphone Amplifier Input 1.6V 100kΩ (1.6V) 9 10 LINEL IN LINER IN Lch Line Amplifier1 Input Rch Line Amplifier1 Input 1.6V 100kΩ (1.6V) 5

6 ! TERMINAL DESCRIPTION PIN NO. SYMBOL FUNCTION EQUIVALENT CIRCUIT VOLTAGE RECL IN+ RECR IN+ Lch Line Amplifier2 REC (+) Input Rch Line Amplifier2 REC (+) Input 1.6V 17kΩ 48kΩ (1.6V) RECL IN RECR IN Lch Line Amplifier2 REC () Input Rch Line Amplifier2 REC () Input 1.6V 17kΩ 48kΩ Feedback 8 REF Reference Voltage 1.6V 1.6V X_MUTEA IN X_MUTEB IN X_MUTEC IN Logic Input A for Mute Control of Logic Input B for Mute Control of Logic Input C for Mute Control of 5kΩ 12kΩ 200kΩ 0V 2.98V 17 X_PROTECT Logic Output for Detector 2.95V 12kΩ 100kΩ 6

7 ! TERMINAL DESCRIPTION PIN NO. SYMBOL FUNCTION EQUIVALENT CIRCUIT RECMUTE LINEMUTE HPMUTE Logic Output C for Mute Control of Logic Output B for Mute Control of Logic Output A for Mute Control of VOLTAGE RECR RECL 50Ω Rch Line Amplifier2 REC Output Lch Line Amplifier2 REC Output 50Ω 5.84V 48kΩ 17kΩ to 11pin, 14pin 50Ω LINER LINEL Rch Line Amplifier1 REC Output Lch Line Amplifier1 REC Output 50Ω 100kΩ 5.68V 39.2kΩ 35.4pF (32pin) HPR HPL 50Ω Rch Headphone Lch Headphone 50Ω 100kΩ 4.26V 60.2kΩ 38.5pF (32pin) 7

8 !TERMINAL DESCRIPTION PIN NO. SYMBOL FUNCTION EQUIVALENT CIRCUIT VOLTAGE SPR() IN SPR(+) IN SPL() IN Rch Speaker Amplifier Input Rch Speaker Amplifier + Input Lch Speaker Amplifier Input 100kΩ 31 SPL(+) IN Lch Speaker Amplifier + Input 32 External Reference Voltage Input 0V 12kΩ 8

9 ! APPLICATION CIRCUIT 1 =13 to 18V 1 Det. 10.7V 32 =9V 2 Det. 7V 31 L+ SP Output 3 Detector 30 L REG 4 29 R+ SP Output 5 28 R PWM 3.01V HPL+ HPL 6 Gain=+8.5dB (VO1 : 4.26V) Amplifier µF 100Ω to Headphone Output 0.09V Center : 1.60V HPR µF 100Ω to Headphone Output HPR 8 25 LINEL+ PWM 3.01V 0.09V Center : 1.60V LINER+ LINEL LINER 9 10 Amplifier 2 (=1.6V) Gain=+11dB (VO2 : 5.68V) Bias Control to Line Output to Line Output Vrms RECL 12 Amplifier 3 21 to REC Output Center : 1.5V RECR 13 Gain=+9dB (VO3 : 5.84V) 20 to REC Output X_MUTEA IN X_MUTEC IN X_MUTEB IN X_PROTECT µc Note) Use 9Vsupply voltage to, because it is a supply voltage for high power circuit block. In case of a exceeds 9V [ for example, it will be the common voltage as a ], there is possibility to be not able to satisfy the package power on these components value of the current application circuit. The maximum limitation of power dissipation should be taken into consideration. For example, adjust the load resistances of " Headphone Amplifier " and/or " Regulator". 9

10 ! APPLICATION CIRCUIT 2 =13 to 18V 1 Det. 10.7V 32 =9V # 2 Det. 7V 31 L+ 3 Detector 30 SP Output L REG 4 29 R+ SP Output 5 28 R PWM 3.01V HPL+ HPL 6 Gain=+8.5dB (VO1 : 4.26V) Amplifier µF 100Ω to Headphone Output 0.09V Center : 1.60V HPR+ HPR µF 100Ω to Headphone Output LINEL+ PWM LINEL 3.01V 0.09V LINER+ Center :1.60V LINER RECL COMMON Amplifier 2 (=1.6V) Gain=+11dB (VO2 : 5.68V) Bias Control to Line Output to Line Output 1.0Vrms RECL+ 12 Amplifier 3 21 to REC Output RECR+ 13 Gain=+9dB (VO3 : 6.0V) 20 to REC Output RECR COMMON X_MUTEA IN X_MUTEB IN X_MUTEC IN X_PROTECT µc Note) Use 9Vsupply voltage to, because it is a supply voltage for high power circuit block. In case of a exceeds 9V [ for example, it will be the common voltage as a ], there is possibility to be not able to satisfy the package power on these components value of the current application circuit. The maximum limitation of power dissipation should be taken into consideration. For example, adjust the load resistances of " Headphone Amplifier " and/or " Regulator". 10

11 ! MEASUREMENT CIRCUIT ICC1 1 Det. 10.7V 32 ICC2 2 Det. 7V 31 VDET3 3 Detector 30 VREG 4 29 VDET3 10mA 5 28 Vin Rg=2.2kΩ 6 Gain=+8.5dB (VO1 : 4.26V) Amplifier µF 100Ω AMP1 Output V Vin V Rg=2.2kΩ µF AMP1 Output Ω Vpullup= 25 Rpullup= VOMUTE Vin V Rg=2.2kΩ Vin Rg=2.2kΩ 9 10 Amplifier 2 (=1.6V) Gain=+11dB (VO2 : 5.68V) Bias Control µF AMP2 Output 2.2µF AMP2 Output Vpullup= V Rpullup= VOMUTE Vin=1.5V() Vin Rg=2.2kΩ Vin Amplifier 3 Gain=+9dB µF AMP3 Output 2.2µF AMP3 Output Vpullup= Vin=1.5V() Rg=2.2kΩ Rpullup= VOMUTE VIMUTE VIMUTE VIMUTE X_PROTECT [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. 11