GL6552 GL6552 Low Voltage Compander Pin Configuration 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. VREF VCC EXP IN ALC EXP RECT EXP OUT IN EXP MUTE GL6552 COMP OUT C-ACF COMP RECT COMP MUTE COMP NF GND COMP IN Features 14 DIP, 14 SOP(150mil) • Operating Supply Voltage: 2 ~ 6 V • Built in ALC circuit • Built in Mute logic circuit • Easy gain control to use external component Absolute Maximum Ratings(Ta = 25¡ É.) Parameter Max. Supply Voltage Symbol VCC, MAX Spec. 7 Unit V PD.MAX 600 mW TSTG -55 ~+150 symbol Spec. Unit Operating Voltage VOP 2~6 V Operating Temperature TOP -20 ~ +70 ¡ É Power Dissipation Storage Temperature Remark ¡ É 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 <GND), those voltage on VCC pins with respect to ground must not exceed the values defined by the absolute maximum ratings. Operating Conditions (Ta = 25¡ É) Parameter 1 Remark 9 8 COM P NF COM P IN 2 EXP RECT RECTIFIER EXP OUT To VREF GAIN CELL EXPANDER + 10K EXP MUTE + 10K To VREF 10K 30K 3 MUTE 30K COMPRESSOR 25.8K GAIN CELL 4 + 51K 65K EXP IN 2 LIMITER 11 C-ACF MUTE To VREF VREF 1 REGULATOR 65K 12 COMP OUT + − 5 100K 3.3K ALC 10 13 RECTIFIER COMP RECT ALC 7 14 6 GND VCC COMP MUTE GL6552 BLOCK DIAGRAM GL6552 Pin Description No. Symbol 1 VREF 2 EXP IN 3 EXP RECT 4 EXP OUT 5 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. 6 COMP MUTE It is an compander mute terminal of a compander. “L” state – compressor mute is executed. “H” state – compressor is executed. 7 GND Ground terminal 8 COMP IN Compressor Mic Amp noninverting input terminal. It is used as input terminal for voice signal. 9 COMP NF Compressor Mic Amp inverting input terminal. It is used for determining Mic Amp gain by resistor 10 COMP RECT External rectifing capacitor is connected to this terminal. Attack and decay time of expander is determined by capacitor. 11 C-ACF Feedback coupling capacitor is connected to this terminal. Low cut-off frequency of compressor is determined by this capacitor. 12 COMP OUT 13 ALC 14 VCC 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 3 GL6552 Electrical Characteristics (VCC=3V, f=1KHz, Ta=25¡ Éunless otherwise specified) PARAMETER SYMBOL SPEC. MIN. TYP. MAX. UNIT CONDITION DC Electrical Characteristics Power Supply Current Reference voltage Icc - 3.6 6 mA No Signal No Signal VREF 0.9 1 1.1 V VOC 240 300 340 mVrms Gain Difference ∆Gc1 -1.0 0 1.0 dB VINC = -20dB T.H.D THDc - 0.5 1 % VINC =0dB, VCC =-3V Mute Attenuation Ratio ATTc 60 80 - dB VINC =0dB Max. Output Voltage VCMAX 1.15 1.35 1.5 Vp-p ALC VALCO 280 325 360 mVrms VPIN13 =0.9V VOE 110 130 160 mVrms VINE =180mVrms (=0dB) ∆GE1 -0.5 0 0.5 dB VINE =-10dB ∆GE1 -1.0 0 1.0 dB VINE =-20dB T.H.D THDE - 0.5 1.5 % VINE =0dB Mute Attenuation Ratio ATTE 60 85 Max. Output Voltage VEMAX 500 600 Compressor part Standard Output Voltage VINC =13mVrms (=0dB) VINC =Variable Expander part Standard Output Voltage Gain Difference 4 - dB VINE =0dB - VINE =Variable mVrms GL6552 Test Circuit 7 6 SW2 MP6 VCC 14 13 ALC COMP OUT 12 11 C-ACF K17 M1 0 22 § Þ K15 0.1 § Þ MP11 MP10 K14 2.2 § Þ K13 K12 0.47 § Þ MP9 9.1K K11 K10 0 0.015 § Þ MP8 AS1 680 5 MP12 1§ Þ K16 5 MP5 K19 K18 10 SW1 5 1§ Þ 10K MP13 10K 9 M2 COMP NF COMP RECT K9 4 2.2 § Þ K8 MP4 K21 K20 8 K7 COMP IN 0.1 § Þ K6 3 K5 MP3 GL6552 1 VREF EXP IN K4 MP2 EXP OUT EXP RECT K3 EXP MUTE 680 COMP 1§ Þ AS2 GND 3.3 § Þ K2 2 K1 MP1 + 0.047 §Þ 100 51K 5 6 §Þ §Þ 150 56k To VREF 100K 3.3K 4 MUTE 30K 25.8K To VREF + GAIN CELL + 20K 3 §Þ RECTIFIER GAIN CELL To VREF 30K 30K 15K 10K 15K 65K 2 33 §Þ + LIMITER 11 §Þ 100 §Þ MUTE To VREF 68K 6.8K 68nF 1 REGULATOR 65K 12 − 8 9 ALC RECTIFIER 10 + 22 + MIC 1 §Þ 13 §Þ To Tx Modulation 6.8K 7 14 6 CUTE 68K 68nF 220K Form Rx output (from MICOM) GL6552 Application Circuit