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SA578 Dataheets PDF



Part Number SA578
Manufacturers Philips
Logo Philips
Description Unity gain level programmable low power compandor
Datasheet SA578 DatasheetSA578 Datasheet (PDF)

RF COMMUNICATIONS PRODUCTS SA578 Unity gain level programmable low power compandor Product specification Replaces data of 1993 December 15 IC17 Data Handbook 1997 Nov 07 Philips Semiconductors Philips Semiconductors Product specification Unity gain level programmable low power compandor SA578 DESCRIPTION The SA578 is a unity gain level programmable compandor designed for low power applications. The SA578 is internally configured as an expandor and a compressor to minimize external compone.

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RF COMMUNICATIONS PRODUCTS SA578 Unity gain level programmable low power compandor Product specification Replaces data of 1993 December 15 IC17 Data Handbook 1997 Nov 07 Philips Semiconductors Philips Semiconductors Product specification Unity gain level programmable low power compandor SA578 DESCRIPTION The SA578 is a unity gain level programmable compandor designed for low power applications. The SA578 is internally configured as an expandor and a compressor to minimize external component count. The summing amplifiers of the SA578 have 600Ω drive capability and the inverting input of the compressor amplifier is accessible through Pin 9 for summing multiple external signals. Power Down/Mute function is active low and requires an open collector output logic configuration at Pin 8. If Power Down/Mute is not needed, Pin 8 should be left open. When the part is muted, supply current drops to 170mA at 3.6V. PIN CONFIGURATION D Package GCELLIN RECTIN EXPCAP EXPOUT 1 2 3 4 16 15 14 13 12 11 VCC COMPCAP2 COMPIN COMPCAP1 RECTIN GCELLIN VREF 5 IREF GND PWRDN/ MUTE 6 7 8 FEATURES • Operating voltage range: 1.8V to 7V • Low power consumption (1.4mA @ 3.6V) • 0dB level programmable • Over 90dB of dynamic range • Wide input/output swing capability • Low external component count • SA578 meets cellular radio specifications • ESD hardened • Power Down mode (ICC = 170µA @ 3.6V) • Mute function • Multiple external summing capability • 600Ω drive capability (10mVRMS to 1.0VRMS) 10 COMP OUT 9 SUM NODE SR00719 Figure 1. Pin Configuration APPLICATIONS • High performance portable communications • Cellular radio • Cordless telephone • Consumer audio • Wireless microphones • Modems • Electric organs • Hearing aids • Automatic level control (ALC) ORDERING INFORMATION DESCRIPTION 16-Pin Plastic Small Outline (SO) TEMPERATURE RANGE –40 to +85°C ORDER CODE SA578D DWG # SOT109-1 ABSOLUTE MAXIMUM RATINGS SYMBOL VCC TA TSTG θJA Supply voltage Operating ambient temperature range Storage temperature range Thermal impedance SO PARAMETER RATING SA578 8 –40 to +85 –65 to +150 125 UNITS V °C °C °C/W 1997 Nov 07 2 853-1537 18660 Philips Semiconductors Product specification Unity gain level programmable low power compandor SA578 BLOCK DIAGRAM and TEST AND APPLICATION CIRCUIT 10k EXPIN C1 + 10µF R1* RECTIFIER RECTIN EXPCAP + C2 2.2µF C3 + EXPOUT 10µF VREF C4 + 10µF 10k 5k COMPCAP2 GAINCELL 10k 1 ∆G Σ 16 VCC 2 30k 30k 10k 15 C7 + C8 2.2µF 3 EXPANDOR 14 + 10µF COMPCAP1 COMPIN 4 Σ 10k 8.6k RECTIFIER 13 + C6 2.2µF 5 VREF BANDGAP 10k VCC GND PWRDN MUTE COMPRESSOR ∆G GAINCELL 12 RECTIN R3* 6 R2* IREF 11 GCELLIN + C5 10µF 7 GND 10 R4 10kΩ + C9 + 10µF COMPOUT PWRDN/ MUTE *R1, R2 and R3 are 1% resistors. 8 9 SUMIN C10 10µF SR00720 Figure 2. Block Diagram and Test and Application Circuit 1997 Nov 07 3 Philips Semiconductors Product specification Unity gain level programmable low power compandor SA578 ELECTRICAL CHARACTERISTICS TA = 25°C, VCC = 3.6VDC, compandor 0dB level = –20dBV = 100mVRMS, output load RL = 10kΩ, Freq = 1kHz, unless otherwise specified. R1, R2 and R3 are 1% resistors. LIMITS SYMBOL PARAMETER TEST CONDITIONS MIN VCC ICC VREF RL THD ENO 0dB Supply voltage1 Supply current Reference voltage2 Summing amp minimum output load Total harmonic distortion Expandor output noise voltage Unity gain level Programmable range3 1kHz, 0dB, BW = 3.5kHz BW = 20kHz, RS = 0Ω 0dB at 1kHz R1 = R3 = 18.7kΩ, R2 = 24.3kΩ R1 = R3 = 22.6kΩ, R2 = 100kΩ R1 = R3 = 7.15kΩ, R2 = 100kΩ R1 = R3 = 1.33kΩ, R2 = 200kΩ VOS Output voltage offset Expandor output DC shift Tracking error relative to 0dB output Crosstalk, COMP to EXP Output swing low VO Output swing high Power Down/Mute low level Power Down/Mute input current Pin 8 grounded 0 –65 No signal No signal to 0dB -20dB expandor 1kHz, 0dB, CREF = 10µF –150 –100 –1.0 –1.0 operating power down No signal, R2 = 100kΩ VCC = 3.6V 1.7 2 SA578 TYP 3.6 1.4 170 1.8 600 0.25 10 0.18 0 –10 –20 –40 1 7 0.3 –80 0.2 VCC – 0.2 0.4 V V µA 150 100 1.0 –65 mV mV dB dB dBV 1.0 20 1.0 MAX 7 2 1.9 V mA µA V Ω % µV dB UNITS NOTE: 1. Operation down to VCC = 1.8V is possible. 2. Reference voltage, VREF, is typically at 1/2 VCC. 3. Unity gain level can be adjusted CONTINUOUSLY between –40dBV = 10mVRMS and 0dBV = 1.0VRMS. For details see application note AN1762. 1997 Nov 07 4 Philips Semiconductors Product specification Unity gain level programmable low power compandor SA578 TYPICAL PERFORMANCE CHARACTERISTICS VCC = 3.6V, TA = 25°C, R1=R3=7.15kΩ, R2=100kΩ, 0dB level = 100mV, Freq. = 1kHz SUPPLY CURRENT vs SUPPLY VOLTAGE 1.6 SUPPLY CURRENT vs TEMPERATURE 1.8 1.5 1.6 1.4 SUPPLY CURRENT (mA) 1.4 SUPPLY CURRENT (mA) 1.3 1.2 1.2 1 0.8 1.1 0.6 1 2 3 4 5 6 SUPPLY VOLTAGE (V) 7 8 1 -40 -20 0 20 40 60 AMBIENT TEMPERATURE (°C) 80 100 0.6 UNITY GAIN ERROR vs SUPPLY VOLTAGE 0.6 NOTE: UNITY GAIN ERROR MAY BE SET TO 0 AT ANY VCC BY ADJUSTING THE VALUE OF R1, R3 0.4 EXPANDOR UNIT.


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