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| GL6552 GL6552 Low Voltage Compander General Descriptions The GL6552 is a Compander IC, which contains two variable gain circuits configured for compressing and expanding the dynamic range, and improving of S/N ratio of audio signal. It consists of compressor, expander, Mic Amp, limiter, ALC(Automatic Level Control)and mute logic. The compressor circuit has the 2/1 ratio of input/output ratio by logarithm, and the expander circuit by logarithm. An internal, temperature stable bandgap reference provides the necessary precision voltage and current. Applications include cordless telephone and most voice RF links. * Operating Supply Voltage: 2 ~ 6 V * Built in ALC circuit * Built in Mute logic circuit * Easy gain control to use external component Pin Configuration VREF EXP IN EXP RECT EXP OUT IN EXP MUTE COMP MUTE GND GL6552 VCC ALC COMP OUT C-ACF COMP RECT COMP NF COMP IN Features 14 DIP, 14 SOP(150mil) Absolute Maximum Ratings(Ta = 25 E .) Parameter Max. Supply Voltage Power Dissipation Storage Temperature Symbol VCC, MAX PD.MAX TSTG Spec. 7 600 -55 ~+150 Unit V mW Remark E Stress above those listed under "Absolute Maximum Rating" may cause permanent damage of device. This is stress rating only and functional operation of the device at these or any other conditions above those indicated in the operational sections of this specification is not implied. Exposure to absolute maximum rating conditions for longer periods may affect device reliability. During overload conditions (VIN > VCC or VIN Parameter Operating Voltage Operating Temperature symbol VOP TOP Spec. 2~6 -20 ~ +70 Unit V E Remark 1 ALC C-ACF COMP OUT COMP RECT BLOCK DIAGRAM 13 10 11 12 RECTIFIER 65K + - ALC 51K GAIN CELL 65K To VREF 10K 10K 30K COM P NF 9 + + LIMITER 25.8K 3.3K COM P IN 8 COMPRESSOR To VREF MUTE 6 COMP MUTE 100K 2 30K 10K GAIN CELL EXPANDER 14 REGULATOR RECTIFIER To VREF VCC + MUTE 7 GND 5 EXP OUT 4 3 EXP RECT 2 EXP IN 1 VREF EXP MUTE GL6552 GL6552 Pin Description No. 1 2 3 4 5 Symbol VREF EXP IN EXP RECT EXP OUT EXP MUTE Function Output terminal of bias circuit (Band Gap of reference). It is an internal reference voltage used for supplying a constant voltage to the compressor and the expander. Expander input terminal External rectifing capacitor is connected to this terminal. Attack and decay time of expander is determined by capacitor. Expander output terminal It is an expander mute terminal of a compander. "L" state - expander mute is executed. "H" state - expander is executed. It is an compander mute terminal of a compander. "L" state - compressor mute is executed. "H" state - compressor is executed. Ground terminal Compressor Mic Amp noninverting input terminal. It is used as input terminal for voice signal. Compressor Mic Amp inverting input terminal. It is used for determining Mic Amp gain by resistor External rectifing capacitor is connected to this terminal. Attack and decay time of expander is determined by capacitor. Feedback coupling capacitor is connected to this terminal. Low cut-off frequency of compressor is determined by this capacitor. Compressor output terminal. It is a reference voltage input terminal of ALC. ALC circuit may be turned off according to the ALC reference voltage. Supply voltage terminal 6 7 8 9 10 11 12 13 14 COMP MUTE GND COMP IN COMP NF COMP RECT C-ACF COMP OUT ALC VCC 3 GL6552 Electrical Characteristics (VCC=3V, f=1KHz, Ta=25 Eunless otherwise specified) PARAMETER SYMBOL SPEC. MIN. TYP . 0.9 240 -1.0 60 1.15 280 110 -0.5 -1.0 60 500 3.6 1 300 0 0.5 80 1.35 325 130 0 0 0.5 85 600 MAX. 6 1.1 340 1.0 1 1.5 360 160 0.5 1.0 1.5 UNIT CONDITION DC Electrical Characteristics Power Supply Current Reference voltage Compressor part Standard Output Voltage Gain Difference T.H.D Mute Attenuation Ratio Max. Output Voltage ALC Expander part Standard Output Voltage Gain Difference T.H.D Mute Attenuation Ratio Max. Output Voltage VOE GE1 GE1 THDE ATTE VEMAX mVrms dB dB % mVrms VINE =180mVrms (=0dB) VINE =-10dB VINE =-20dB VINE =0dB VINE =0dB VINE =Variable VOC Gc1 THDc ATTc VCMAX VALCO mVrms dB % dB Vp-p mVrms VINC =13mVrms (=0dB) VINC = -20dB VINC =0dB, VCC =-3V VINC =0dB VINC =Variable VPIN13 =0.9V Icc VREF mA V No Signal No Signal - dB 4 GL6552 Test Circuit K1 VREF VCC 3.3 K2 1 AS2 MP2 MP3 680 K3 K4 K5 EXP IN 14 MP1 1 ALC 13 K21 MP13 2 EXP OUT EXP RECT COMP OUT 12 3 0.1 K6 K7 K20 K19 K18 1 10K 0 22 MP11 MP12 M1 C-ACF M2 1 10K MP5 K9 11 MP4 2.2 K8 GL6552 4 K17 K16 COMP NF COMP RECT EXP MUTE 10 5 5 SW1 K15 0.1 K14 2.2 K13 MP10 COMP SW2 MP6 6 9 K12 K11 0.47 9.1K 0 0.015 MP9 COMP IN GND MP8 AS1 7 8 K10 680 5 To Tx Modulation 22 + 100 Application Circuit 13 12 10 11 RECTIFIER 65K - + 30K GAIN CELL 65K 25.8K 30K 20K ALC 15K 1 + 9 To VREF 3.3K 51K 0.047 8 100K MIC + LIMITER MUTE 6 CUTE (from MICOM) To VREF 30K 15K GAIN CELL To VREF 6 + 10K MUTE 14 REGULATOR To VREF 3 RECTIFIER 7 5 4 2 + 1 6.8K 33 68K 6.8K 220K 100 56k 68nF 150 68nF Form Rx output 68K GL6552 |
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