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| Low Current Preamplifier with Output Limiting GL504 - DATA SHEET FEATURES * designed to drive class D integrated receivers * MPO range externally adjustable * 150 A typical current drain * 46 dB of adjustable gain * low external parts count Composed of two stages, an inverting preamp with gain of 28 dB, and a transconductance block with gain of 18 dB, the GL504 is easily configured for mid-supply reference as required by the class D receivers. The two stages of the GL504 must be AC coupled in order to maintain the DC bias conditions of each stage. Also, a 48 k resistor, between the output and ground, is used to keep the receivers at mid-supply reference. The minimal total parts count, excluding an MPO variable resistor, requires 3 capacitors, a 100 k volume control and the 48 k bias resistor at the output. The GL504 is capable of providing a flat frequency response with very little distortion. DESCRIPTION The GL504 is a low current preamplifier designed to drive the class D series of integrated receivers. This preamp has a built-in symmetrical peak clipping output limiter, 46 dB of adjustable gain, and requires few external components. STANDARD PACKAGING * 8 Pin MICROpac * 8 Pin PLID(R) * 8 Pin SLT * Chip (56 x 56 mils) Au Bump R MIC 6 R MIC 7 V B R A IN 5 PULL A B 8 B OUT R CLIP 4 U.S. Patent No. 07/354,327 3 B IN 2 MPO 1 GND A OUT BLOCK DIAGRAM Revision Date: May 1998 Document No. 510 - 99 - 06 GENNUM CORPORATION P.O. Box 489, Stn. A, Burlington, Ontario, Canada L7R 3Y3 tel. +1 (905) 632-2996 Web Site: www.gennum.com E-mail: hipinfo@gennum.com ABSOLUTE MAXIMUM RATINGS PARAMETER Supply Voltage Operating Temperature Storage Temperature PIN CONNECTION AOUT BIN MPO 4 5 AIN R MIC VB 1 8 B OUT VALUE / UNITS 5V -10C to +40C -20C to +70C GND CAUTION Class 1 ESD Sensitivity ELECTRICAL CHARACTERISTICS (refer to test circuit) Supply Voltage = 1.3 V, Test Frequency 1kHz PARAMETER Amplifier Current Microphone Resistance Input Referred Noise Gain MPO Level SYMBOL IAMP RMIC IRN AV MPO NFB 0.2 to 10kHz at 12 dB/oct VIN = -80 dBV VIN = -50 dBV RMPO = 0 VIN = -50 dBV RMPO = 10 k CONDITIONS RMPO = 0 MIN 75 3.0 44.5 -16 TYP 150 4.0 2 46.5 -14 MAX 225 5.3 48.5 -12 UNITS A k VRMS dB dBV Change in MPO MPO 10 12 14 dB Preamp A input Bias Current Pull-up Resistance Gain Loss IBIAS A RPULL GAIN R4 = 10 k, VIN = -70 dBV, RMPO = 50 k -25 40 - 0 48 0 +25 58 2.5 nA k dB RMIC 6 R 5 3k9 022 V IN I AMP 7 PULL V B =1.3 VDC A V OUT 01 A B 8 R CLIP V IN 1+40 dB 1k 10 4 3 2 RMPO 1 47k R4 100k 01 All resistors in ohms, all capacitors in F, unless otherwise stated. Fig. 1 Test Circuit 510 - 99 - 06 2 RMIC 6 7 RPULL 4 8 BASE CURRENT COMPENSATION 33k 5 2k5 1 All resistors in ohms, all capacitors in F, unless otherwise stated. 2 3 Fig. 2 Functional Schematic R MIC 10 MIC 7 R PULL V B =1.3 VDC 10 33n 48k 6 B CLASS D INTEGRATED RECEIVER 01 5 A 8 R CLIP 4 R VC 3 2 10k RMPO 1 100k 22n All resistors in ohms, all capacitors in F, unless otherwise stated. Fig. 3 Typical Application Circuit 3 510 - 99 - 06 -10 -10 RVC = 100k -20 -30 -15 RVC = 33k OUTPUT (dBV) R MPO = 0 RMPO = 3k3 -20 -25 -30 -35 -40 OUTPUT (dBV) -40 -50 -60 -70 -80 -90 -140 -120 -100 -80 -60 -40 -20 RMPO = 10k RVC = 10k RVC = 3k3 -45 -50 -100 INPUT (dBV) -80 -60 -40 -20 INPUT (dBV) Fig. 4 I/O Curves at Various RVC Settings Fig. 5 I/O for Various MPO Values 4 10 C S = 022 0 9 8 7 RELATIVE OUTPUT (dB) CS = 01 -4 THD (%) 20k CS = 0047 -8 6 5 4 3 2 1 CS = 0033 -12 -16 -20 20 200 2k 0 -90 -86 -82 -78 -74 -70 -66 -62 -58 FREQUENCY (Hz) INPUT (dBV) Fig. 6 Frequency Response for Various CS Values Fig. 7 Distortion vs Input Level (R VC=100k) 0 RELATIVE AMPLIFIER CURRENT (A) -10 -20 -30 -40 -50 -60 -70 -80 -90 0 5 10 15 20 25 30 RMPO (k) Fig. 8 Quiescent Current vs MPO Resistance 510 - 99 - 06 4 -10 -14 -18 -22 55 No Load 50 OUTPUT (dBV) -26 -30 -34 -38 -42 -46 -50 0 10 50k Load GAIN (dB) 1k 10k 100k 45 40 100 35 10 100 1k 10k 100k RMPO () FREQUENCY (Hz) Fig. 9 Output vs MPO Resistance Fig. 10 Preamplifier A Open Loop Voltage Gain 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: Updated to Data sheet Gennum Corporation assumes no responsibility for the use of any circuits described herein and makes no representations that they are free from patent infringement. (c) Copyright July 1990 Gennum Corporation. All rights reserved. Printed in Canada. 5 510 - 99 - 06 |
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