AGC-O Amplifier Chip GR592 DATA SHEET DESCRIPTION • low distortion compression limiting • 38dB maximum system gain, adjustable over a 38dB range • output compression threshold, adjustable over 16dB range The GR592 features AGC-O capability for low distortion output limiting. The circuit consists of an AGC preamplifier, an output stage capable of driving a class D integrated receiver and an independent gain stage. • designed to drive a class D integrated receiver • averaging detector • additional gain stage PACKAGING Chip (94 x 48 x 10 mil) (2.39 x 1.22 x 0.25 mm) Au Bump The compression control circuit, connected between the input and output of the AGC preamplifer, varies the current controlled resistance. It operates with an 8:1 compression ratio and uses an averaging detector. The time constant of the detector is a function of the rectifier capacitor value. With the rectifier capacitor value 150nF the time constant of the detector is 270ms, providing optimal sound quality over a full range of sound and listening environments. The actual attack and release times are typically 40ms and 150ms respectively when the circuit is fully in the compression region of operation (measured times vary depending on gain and threshold settings). The system gain and compression control can be adjusted by choosing two independent resistors or 100k trimmers. Maximum system gain (AGC preamplifier and the output stage) is 38dB. The output compression threshold can be adjusted within a 16dB range. RVC VB 4 VREG 5 CAGC RTH 1 14 12 REGULATOR 8:1 COMPRESSION CONTROL 80k VB RECT. 48k 9 -F IN 12k 10k 7 RF4A 13 B -A 800 8 RF4B 6 FOUT 48k 2 3 AIN OUT AOUT 11 RECT 10 GND All resistors in ohms, all capacitors in farads, unless otherwise stated. BLOCK DIAGRAM Doc. No. 19423 - 0 [Rev. July 200] 1 GR592 FEATURES CHIP PIN CONNECTION GR592 ABSOLUTE MAXIMUM RATINGS PARAMETER VALUE Supply Voltage 3 VDC Power Dissipation 25 mW Operating Temperature Range -10° C to 40° C Storage Temperature Range -20° C to 70° C CAUTION RVC AOUT AIN VB VREG 1 2 3 4 5 6 7 11 10 9 8 RECT GND 14 13 RTH BOUT 12 FOUT RF4A ELECTROSTATIC SENSITIVE DEVICES DO NOT OPEN PACKAGES OR HANDLE EXCEPT AT A STATIC-FREE WORKSTATION CAGC FIN RF4B ELECTRICAL CHARACTERISTICS CONDITIONS: Frequency = 1 kHz, Temperature = 25°C, Supply Voltage V B = 1.3 V PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS Hybrid Current IAMP - 235 340 µA Minimum Voltage VB - - 1.1 V - 0.5 1.0 % 35 38 41 dB VREG 890 935 1000 mV PSRR 49 56 - dB Total Harmonic Distortion THD System Gain at Peak AV Regulator Voltage Power Supply Rejection Ratio VIN = -60dBV Frequency = 2.8kHz AGC Maximum Threshold (O/P Referred) THMAX VIN = -60dBV, Note 2 -43 -41 -39 dBV Minimum Threshold (O/P Referred) THMIN VIN = -70dBV, RTH = 100k, Note 2 -59 -57 -55 dBV ∆AVC RVC = 100kΩ to 0Ω 35 38 41 dB Compression Ratio High Threshold CMP-H VIN = -60dBV to -30dBV, RTH = 0 8.0 9.0 10.0 ratio Compression Ratio Low Threshold CMP-L VIN = -70dBV to -40dBV, RTH = 100kΩ 6.5 7.3 9.0 ratio VIN = -70dBV 24 27 30 dB Note 1 47 53 55 dB τAGC - 270 - ms Gain AB - 11 - dB Output Resistance ROP - 24 - kΩ VC Gain Range Stage A Gain Compression Gain Range AA ARANGE AGC Time Consrtant OUTPUT STAGE All parameters and switches remain as shown in the Test Circuit unless otherwise stated in the CONDITIONS column. NOTE: 1. ARANGE = AA - AA[VIN = -20dBV, RTH = 100k] 2. Measured at output of Stage A 19423 - 0 2 VB Rvc=100k C7 0µ15 RTH =0 REGULATOR C2 0µ1 GR592 8:1 COMPRESSION CONTROL 80k VB RECT. 48k -F VIN VOUT B -A 12k 10k C8 33n 48k 50k 800 50k C6 22n C5 0µ1 All resistors in ohms, all capacitors in farads, unless otherwise stated. Fig. 1 Production Test Circuit CHIP DIMENSIONS 94.00 + / - 2.00 18.43 13.35 15.20 2 1 13.23 4 3 10.99 10.99 6 5 7 11.91 Y 16.08 48.01 ± - 2.00 36.19 X 11.91 14 6.46 TYP 5.92 TYP 13 15.35 12 16.41 11 16.22 12.21 20.09 10 9 10.99 10.99 8 Dimensioning units are MILS GENNUM CORPORATION MAILING ADDRESS: P.O. Box 489, Stn. A, Burlington, Ontario, Canada L7R 3Y3 Tel. +1 (905) 632-2996 Fax +1 (905) 632-2814 SHIPPING ADDRESS: 970 Fraser Drive, Burlington, Ontario, Canada L7L 5P5 GENNUM JAPAN CORPORATION C-101, Miyamae Village, 2-10-42 Miyamae, Suginami-ku, Tokyo 168-0081, Japan Tel. +81 (3) 3334-7700 Fax: +81 (3) 3247-8839 DOCUMENT IDENTIFICATION: DATA SHEET The product is in production. Gennum reserves the right to make changes at any time to improve reliability, function or design, in order to provide the best product possible. REVISION NOTES: New Document Gennum Corporation assumes no responsibility for the use of any circuits described herein and makes no representations that they are free from patent infringement. © Copyright July 2001 Gennum Corporation. All rights reserved. 19423 - 0 Printed in Canada. 3