Class A Compression Amplifier LD511 DATA SHEET FEATURES DESCRIPTION • 64 dB typical electrical gain The LD511 is a Class A compression amplifier which can operate over a range of DC battery voltages from 1.1 V to 2.4 V. A voltage regulator, which is independent of supply voltage variations, is on-chip to supply a stable 0.94 VDC bias to the amplifier circuitry and to the microphone. • 0.94 VDC voltage regulator • 7 ms attack time, 40 ms release time • 15 dB threshold adjustment • low noise and distortion The LD511, in compression, has approximately 15 dB of threshold adjustment by varying RTH (see application circuit) and a compression function ratio of ∞ : 1. • compression ratio ∞ : 1 • 0.3 kHz - 6 kHz frequency response Minimum attack and release times are fixed at 7 ms and 40 ms respectively and they can be adjusted simultaneously by changing the filter capacitor on pin 8, although the ratio of attack to release time is kept constant. STANDARD PACKAGING • 10 pin MICROpac • 10 pin MINIpac The output stage bias can be set to accommodate different receiver impedances by changing the value of RE . The voltage across RE (pin 2 to ground) is a constant 27 mV so the bias current is 27 mV divided by the total value of RE in parallel with 500 Ω. • 10 pin PLID ® • 10 pin SLT • Chip (59 x 59 mils) Au Bump A OUT B IN VB 1 10 6 VOLTAGE REGULATOR VREG 7 20K 3 9 A IN RIN -A 10K 35K -B B OUT RE 5 RECTIFIER AGC 8 4 CAGC GND 2 RE All resistors in ohms, all capacitors in farads unless otherwise stated BLOCK DIAGRAM Revision Date: January 2001 500 - 32 - 11 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: [email protected] ABSOLUTE MAXIMUM RATINGS PIN CONNECTION PARAMETER VALUE/UNITS Supply Voltage 2.4 V DC AGC 25 mW GND VREG Operating Temperature Range -10°C to 40° C B OUT CAGC Storage Temperature Range -20°C to 70° C RE Power Dissipation 5 6 VB A IN 1 B IN 10 A OUT CAUTION CLASS 1 ESD SENSITIVITY ELECTRICAL CHARACTERISTICS Conditions: Frequency = 1 kHz, Temperature = 25°C, Supply Voltage VB = 1.3 VDC PARAMETER SYMBOL Gain AV Input Referred Noise IRN Total Harmonic Distortion THD Amplifier Current IAMP Transducer Current ITRANS Input Impedance RIN Regulated Voltage VREG CONDITIONS MIN TYP MAX UNITS 60 64 68 dB - 2.0 4.0 µV - 1 3 % COMPRESSION INACTIVE (S1 OPEN) NFB 0.2 - 10kHz at 12 dB/oct - 0.4 0.6 mA 1.35 1.6 2.0 mA - 15 - kΩ 0.90 0.96 1.0 VDC On Chip Emitter Resistance RE - 500 - Ω Emitter Bias Voltage (pin 2) VRE - 27 - mV - ∞ - dB COMPRESSION ACTIVE (S1 CLOSED) Compression Range Total Harmonic Distortion THDCOMP V2 = 1 mV - 4.0 7.0 % Attack Time TATT V2 switched from 112µV to 2 mV - 7 - ms Release Time TREL - 40 - ms Compression Output VCOMPOUT V2 = 1 mV - 0.10 0.18 VRMS Compression Output Change ∆V COMPOUT V2 = 120 mV; Note 1 - 13 20 mVRMS All parameters and switches remain as shown in Test Circuit unless otherwise stated in CONDITIONS column Notes: 1. ∆VCOMPOUT = VOUT[V2 =120mV] - VCOMPOUT 0.033 VB=1.3 VDC IAMP RB 4.7 10 6 1 ITRANS VOLTAGE REGULATOR V2 VOUT 0.068 RL 600 7 20K 3.9K 56K 9 3 -A Hammond 99966 -B 10K CS 0.047 35K RE S1 RS 50 5 RECTIFIER 56 27K 0.0047 8 10 4 2.2 All resistors in ohms, all capacitors in farads unless otherwise stated Fig. 1 Test Circuit 500 - 32 - 11 2 2 15 7 10 6 80 10K 20K 15K 3 9 32K 2 3.2K 500 4 5 8 All resistors in ohms, all capacitors in farads unless otherwise stated 1 Fig. 2 Functional Schematic VB=1.3 VDC RVC 10K 0.1 10 6 1 VOLTAGE REGULATOR ED1913 7 20K 10 9 3 -A 10K 0.1 35K -B RTH 100K RE 5 RECTIFIER 8 4 4.7n 2 2.2 0.068 47 All resistors in ohms, all capacitors in farads unless otherwise stated Fig. 3 LD511 Stand Alone Application Circuit VB=1.3 VDC RVC 10K 0.1 10 1.0 6 1 EP3075 VOLTAGE REGULATOR 7 MPO 50K 20K 10 9 3 -A 10K 0.1 0.1 -B 35K RTH 100K RE 5 RECTIFIER 8 4 2.2 0.0047 2 All resistors in ohms, all capacitors in farads unless otherwise stated Fig. 4 LD511/Class D Application Circuit 3 500 - 32 - 11 63 -0.1 62 VOLTAGE GAIN (dB) REGULATOR VOLTAGE GAIN(dB) 0 -0.2 -0.3 -0.4 -0.5 0 10 20 30 40 50 60 70 80 90 61 60 59 58 100 0.8 0.9 1.0 BATTERY RESISTANCE (Ω) Fig. 5 Voltage Gain vs Battery Resistance 1.3 1.4 1.5 1.6 1.7 REGULATOR VOLTAGE (VDC) 0.95 2.0 TOTAL CURRENT (mA) 1.2 Fig. 6 Voltage Gain vs Battery Voltage 2.5 1.5 1.0 0.5 0 0.93 0.91 0.89 0.87 0.85 0.9 1.0 1.1 1.2 1.3 1.4 1.5 1.6 1.7 1.8 0.9 1.1 BATTERY VOLTAGE (V) 1.3 1.5 1.7 BATTERY VOLTAGE (V) Fig. 8 Regulator Voltage vs Battery Voltage Fig. 7 Total Current vs Battery Voltage 4 1000 RTH = ∞ 500 2 RTH = 200k CS = 47nF 0 200 -2 RTH = 100k RELATIVE OUTPUT (dB) OUTPUT VOLTAGE (mV) 1.1 BATTERY VOLTAGE (V) 100 RTH = 0k 50 20 10 5 -4 -6 CS = 22nF -8 -10 CS = 10nF -12 -14 -16 CS = 6.8nF -18 2 -20 0.01 0.1 1.0 10 100 20 20k FREQUENCY (Hz) INPUT VOLTAGE (mV) Fig. 10 Frequency Response at Various CS Values Fig. 9 Threshold Adjustment GENNUM CORPORATION 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. 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 REVISION NOTES: GENNUM JAPAN CORPORATION Changes to standard packaging information C-101, Miyamae Village, 2-10-42 Miyamae, Suginami-ku, Tokyo 168-0081, Japan Tel. +81 (3) 3334-7700 Fax: +81 (3) 3247-8839 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 November 1980 Gennum Corporation. All rights reserved. 500 - 32 - 11 4 Printed in Canada.