INTEGRATED CIRCUITS DATA SHEET TDA8575 Ground noise isolation amplifier Preliminary specification File under Integrated Circuits, IC01 1996 Jul 29 Philips Semiconductors Preliminary specification Ground noise isolation amplifier TDA8575 FEATURES GENERAL DESCRIPTION • High common mode rejection up to high frequencies The TDA8575(T) is a two channel amplifier with differential input and single-ended output for use in car audio applications. The differential amplifier has a gain of 0 dB, a low distortion and a high common mode rejection. The TDA8575T comes in a 16 pin SO package and TDA8575 comes in a 16 pin DIP package. • Reduced dependency of common mode rejection on source resistance • Low distortion • Low noise • AC and DC short-circuit safe The TDA8575(T) is developed for those car audio applications where long connections between signal sources and amplifiers (or boosters) are necessary and ground noise has to be eliminated. • Few external components • ESD protected on all pins. QUICK REFERENCE DATA SYMBOL PARAMETER VCC supply voltage ICC supply current CONDITIONS VCC = 8.5 V MIN. TYP. MAX. UNIT 5 8.5 18 V − 12.6 15 mA −0.5 0 +0.5 dB − 1.7 − V 55 60 − dB − 80 − dB Gv voltage gain Vo(rms)(max) maximum output voltage (RMS value) SVRR supply voltage ripple rejection CMRR common mode rejection ratio Rs = 0 Ω THD total harmonic distortion Vo(rms) = 1 V; f = 1 kHz − 0.005 − % Vno noise output voltage − 3.7 5 µV Zi input impedance − 108 − kΩ Zo output impedance − − 10 Ω THD = 0.1% ORDERING INFORMATION PACKAGE TYPE NUMBER NAME TDA8575T SO16 plastic small outline package; 16 leads; body width 3.9 mm SOT109-1 TDA8575 DIP16 plastic dual in-line package; 16 leads (300 mil); long body SOT38-1 1996 Jul 29 DESCRIPTION 2 VERSION Philips Semiconductors Preliminary specification Ground noise isolation amplifier TDA8575 BLOCK DIAGRAM handbook, full pagewidth INL+ 12 1 108 kΩ INL− V I OUTL I V 5 360 kΩ 0.5(VCC − 0.7) + 0.7 VCC 16 0.68(VCC − 0.7) + 0.7 8 TDA8575(T) 9 6 7 108 kΩ V I I V 11 MGE829 Fig.1 Block diagram. 1996 Jul 29 GND 0.5(VCC − 0.7) + 0.7 360 kΩ INR+ SVRR REFERENCE 0.68(VCC − 0.7) + 0.7 INR− VCC 3 OUTR Philips Semiconductors Preliminary specification Ground noise isolation amplifier TDA8575 PINNING SYMBOL PIN DESCRIPTION INL+ 1 positive input left n.c. 2 not connected n.c. 3 not connected n.c. 4 not connected INL− 5 negative input left INR− 6 negative input right INR+ 7 positive input right SVRR 8 supply voltage ripple rejection GND 9 ground n.c. 10 not connected OUTR 11 output voltage right channel OUTL 12 output voltage left channel n.c. 13 not connected n.c. 14 not connected n.c. 15 not connected VCC 16 supply voltage handbook, halfpage INL+ 1 16 VCC n.c. 2 n.c. 3 n.c. 4 handbook, halfpage INL+ 1 16 VCC 15 n.c. n.c. 2 15 n.c. 14 n.c. n.c. 3 14 n.c. 13 n.c. n.c. 4 TDA8575T INL− 5 12 OUTL INL− 5 12 OUTL INR− 6 11 OUTR INR− 6 11 OUTR INR+ 7 10 n.c. INR+ 7 10 n.c. SVRR 8 9 SVRR 8 9 GND MGE828 GND MGE827 Fig.2 Pin configuration TDA8575T. 1996 Jul 29 13 n.c. TDA8575 Fig.3 Pin configuration TDA8575. 4 Philips Semiconductors Preliminary specification Ground noise isolation amplifier TDA8575 This is inconvenient for most applications and therefore the TDA8575(T) is equipped with a quick charge circuit. On power-on the quick charge circuit charges the capacitor C2 connected to the IN- pins. The quick charge circuit consists of a voltage buffer and a control circuit (referred to as ‘reference and power check’ in Fig.6) that monitors the supply voltage VCC. If the supply voltage rises more than ≈ 2 V the voltage buffer is switched on. After charging C2 the voltage buffer is switched off. The charge time of C2 will equal the charge time of C4, the SVRR capacitor. FUNCTIONAL DESCRIPTION System description To enable a high common mode rejection a new system setup is used. The voltage to current converter, referred to as V → I in the block diagram of Fig.1, replaces the resistors that can be seen in the conventional system solution. Both systems are shown in Figs 4 and 5. In the conventional system the common mode rejection is limited by the matching properties of the resistors resulting in a CMRR of 60 dB maximum. Using the new system setup a CMRR of 80 dB is achieved. Power on In Fig.6 the preferred input capacitor values are shown. If the capacitor C2 = 22 µF connected to the IN- inputs had to be charged by the 0.5Vcc voltage source a charge time 360 kΩ of 5τ = 5 × ------------------- × 22 µF = 20s would be required. 2 handbook, halfpage handbook, halfpage Vi Vo Vi I V Vo 0.5 VCC 0.5 VCC MGE830 MGE831 Fig.5 New system using V → I converters. Fig.4 Conventional system. 1996 Jul 29 V I 5 Philips Semiconductors Preliminary specification Ground noise isolation amplifier TDA8575 handbook, full pagewidth C1 220 nF Rs 5 kΩ TDA8575(T) INL+ 1 108 kΩ V I VOLTAGE BUFFER INL− 5 Vi(L) 360 kΩ switch off 16 VCC C2 8 SVRR REFERENCE AND POWER CHECK 22 µF C4 47 µF Vcm 9 GND switch off 360 kΩ Vi(R) INR− 6 Rs 5 kΩ C1 INR+ 7 108 kΩ VOLTAGE BUFFER V I 220 nF MGE832 Fig.6 Quick charge circuit. 1996 Jul 29 6 Philips Semiconductors Preliminary specification Ground noise isolation amplifier TDA8575 LIMITING VALUES In accordance with the Absolute Maximum Rating System (IEC 134). SYMBOL PARAMETER CONDITIONS MIN. MAX. UNIT − 18 V repetitive peak output current − 40 mA Vsc AC and DC short-circuit safe voltage − 18 V Tstg storage temperature −55 +150 °C Tamb operating ambient temperature −40 +85 °C Tj junction temperature − +150 °C VCC supply voltage IORM operating THERMAL CHARACTERISTICS SYMBOL Rth j-a PARAMETER VALUE UNIT TDA8575 (DIP16) 75 K/W TDA8575T (SO16) 110 K/W thermal resistance from junction to ambient in free air QUALITY SPECIFICATION Quality according to UZW-BO/FQ-0601, if this type is used as an audio amplifier. DC CHARACTERISTICS VCC = 8.5 V; Tamb = 25 °C; R L = 10 kΩ; in accordance with application circuit (see Fig.9). SYMBOL PARAMETER VCC supply voltage ICC supply current VO output voltage CONDITIONS Vi = 0 V note 1 Note 1. The DC output voltage with respect to ground is approximately 0.5VCC. 1996 Jul 29 7 MIN. TYP. MAX. 18 UNIT 5 8.5 V − 12.6 15 mA − 4.7 − V Philips Semiconductors Preliminary specification Ground noise isolation amplifier TDA8575 AC CHARACTERISTICS VCC = 8.5 V; f = 1 kHz; Rs = 0 kΩ; R L = 10 kΩ; Tamb = 25 °C; in accordance with application circuit (see Fig.9). SYMBOL PARAMETER Gv voltage gain αcs channel separation ∆Gv channel unbalance fro(L) low frequency roll-off fro(H) high frequency roll-off Zi input impedance Zo output impedance Vi(rms)(max) maximum input voltage (RMS value) CONDITIONS MIN. TYP. MAX. UNIT −0.5 0 +0.5 dB 70 80 − dB − − 0.5 dB −1 dB; note 2 − − 20 Hz −1 dB 20 − − kHz 80 108 123 kΩ Rs = 5 kΩ; note 1 − − 10 Ω THD = 1% − 1.7 − V Vno noise output voltage unweighted; note 3 − 3.7 5 µV THD total harmonic distortion Vi(rms) = 1 V − 0.005 0.01 % Vi(rms) = 1 V; f = 20 Hz to 20 kHz − 0.01 − % Vi(rms) = 1 V; RL = 150 Ω − − 1 % THDmax total harmonic distortion at maximum output current Vi(cm)(rms) common-mode input voltage (RMS value) CMRR common-mode rejection ratio SVRR supply voltage ripple rejection − − 1 V Rs = 5 kΩ 66 80 − dB Rs = 0 Ω; note 4 f = 100 Hz to 20 kHz − 80 − dB Rs = 2 kΩ; note 5 55 − − dB Rs = 2 kΩ; note 5 f = 20 Hz to 20 kHz − 60 − dB Notes 1. The channel separation is dependent on the capacitor C2 connected to the IN- input. The channel separation for low frequencies (<1 kHz) can be increased by using a larger capacitance for C2. 2. The frequency response is externally fixed by the input and output coupling capacitors. 3. The noise output voltage is measured in a bandwidth of 20 Hz up to 20 kHz, unweighted. 4. The common mode rejection ratio is measured at the output with a voltage source Vcm(rms) = 1 V and both Vi(L) and Vi(R) short-circuited according to Fig.9. The common mode rejection is dependent on the capacitor C2 connected to the IN- input. The common mode rejection for low frequencies (<1 kHz) can be increased by using a larger capacitance for C2. 5. Supply voltage ripple rejection is measured at the output using a ripple amplitude of 2 V (p-p). The source resistance Rs = 2 kΩ. 1996 Jul 29 8 Philips Semiconductors Preliminary specification Ground noise isolation amplifier TDA8575 Due to wiring resistance and noise coming from various electric devices in the automobile, performance loss will appear in those car audio applications where long connections between signal sources and amplifiers (or boosters) are necessary. To solve these problems the TDA8575(T) is developed (see Figs 7 and 8). APPLICATION INFORMATION General The TDA8575(T) is a two channel amplifier with differential input and single-ended output for use in car audio applications. The differential amplifier has a gain of 0 dB, a low distortion and a high common mode rejection. Vbat VCC handbook, full pagewidth in speaker Vno+Vi Vi long cable tuner tape CD power amplifier Vno car body noise car body car body MGE833 Fig.7 A typical noise problem in car audio systems. handbook, full pagewidth ground noise isolation amplifier VCC in VCC Vno+Vi Vi + long cables tuner tape CD − Vno Vbat speaker Vi+Vno / CMRR power amplifier Vno car body noise car body car body MGE834 Fig.8 The TDA8575(T) eliminates noise problems in car audio systems. 1996 Jul 29 9 Philips Semiconductors Preliminary specification Ground noise isolation amplifier TDA8575 handbook, full pagewidth C1 108 kΩ 220 nF Rs 5 kΩ 12 OUTL INL+ 1 C3 2.2 µF V I I V RL 10 kΩ INL− 5 360 kΩ Vi(L) VCC VCC = 8.5 V 16 VCC C2 8 SVRR TDA8575(T) 22 µF C5 100 nF REFERENCE C4 47 µF Vcm 9 GND Vi(R) 360 kΩ INR− 6 Rs 5 kΩ C1 INR+ 7 108 kΩ I V V I 11 OUTR 220 nF 2.2 µF MGE835 Fig.9 Application circuit TDA8575(T). 1996 Jul 29 C3 10 RL 10 kΩ Philips Semiconductors Preliminary specification Ground noise isolation amplifier TDA8575 handbook, full pagewidth C1 108 kΩ 220 nF Rs 5 kΩ 12 OUTL INL+ 1 C3 2.2 µF V I I V RL 10 kΩ INL− 5 360 kΩ Vi(L) C2 VCC 10 µF Vcm1 VCC = 8.5 V 16 VCC 8 SVRR TDA8575(T) C5 100 nF REFERENCE C4 47 µF 9 GND Vcm2 C2 10 µF Vi(R) 360 kΩ INR− 6 Rs 5 kΩ C1 INR+ 7 108 kΩ I V V I 11 OUTR 220 nF C3 2.2 µF MGE836 Fig.10 Application circuit TDA8575(T) with a balanced signal source. 1996 Jul 29 11 RL 10 kΩ Philips Semiconductors Preliminary specification Ground noise isolation amplifier TDA8575 PACKAGE OUTLINES SO16: plastic small outline package; 16 leads; body width 3.9 mm SOT109-1 D E A X c y HE v M A Z 16 9 Q A2 A (A 3) A1 pin 1 index θ Lp 1 L 8 e 0 detail X w M bp 2.5 5 mm scale DIMENSIONS (inch dimensions are derived from the original mm dimensions) UNIT A max. A1 A2 A3 bp c D (1) E (1) e HE L Lp Q v w y Z (1) mm 1.75 0.25 0.10 1.45 1.25 0.25 0.49 0.36 0.25 0.19 10.0 9.8 4.0 3.8 1.27 6.2 5.8 1.05 1.0 0.4 0.7 0.6 0.25 0.25 0.1 0.7 0.3 0.01 0.019 0.0098 0.39 0.014 0.0075 0.38 0.050 0.24 0.23 0.041 0.039 0.016 0.028 0.020 inches 0.0098 0.057 0.069 0.0039 0.049 0.16 0.15 0.01 0.01 0.028 0.004 0.012 θ Note 1. Plastic or metal protrusions of 0.15 mm maximum per side are not included. REFERENCES OUTLINE VERSION IEC JEDEC SOT109-1 076E07S MS-012AC 1996 Jul 29 EIAJ EUROPEAN PROJECTION ISSUE DATE 91-08-13 95-01-23 12 o 8 0o Philips Semiconductors Preliminary specification Ground noise isolation amplifier TDA8575 DIP16: plastic dual in-line package; 16 leads (300 mil); long body SOT38-1 ME seating plane D A2 A A1 L c e Z b1 w M (e 1) b MH 9 16 pin 1 index E 1 8 0 5 10 mm scale DIMENSIONS (inch dimensions are derived from the original mm dimensions) UNIT A max. A1 min. A2 max. b b1 c D (1) E (1) e e1 L ME MH w Z (1) max. mm 4.7 0.51 3.7 1.40 1.14 0.53 0.38 0.32 0.23 21.8 21.4 6.48 6.20 2.54 7.62 3.9 3.4 8.25 7.80 9.5 8.3 0.254 2.2 inches 0.19 0.020 0.15 0.055 0.045 0.021 0.015 0.013 0.009 0.86 0.84 0.26 0.24 0.10 0.30 0.15 0.13 0.32 0.31 0.37 0.33 0.01 0.087 Note 1. Plastic or metal protrusions of 0.25 mm maximum per side are not included. REFERENCES OUTLINE VERSION IEC JEDEC SOT38-1 050G09 MO-001AE 1996 Jul 29 EIAJ EUROPEAN PROJECTION ISSUE DATE 92-10-02 95-01-19 13 Philips Semiconductors Preliminary specification Ground noise isolation amplifier TDA8575 Several techniques exist for reflowing; for example, thermal conduction by heated belt. Dwell times vary between 50 and 300 seconds depending on heating method. Typical reflow temperatures range from 215 to 250 °C. SOLDERING Introduction There is no soldering method that is ideal for all IC packages. Wave soldering is often preferred when through-hole and surface mounted components are mixed on one printed-circuit board. However, wave soldering is not always suitable for surface mounted ICs, or for printed-circuits with high population densities. In these situations reflow soldering is often used. Preheating is necessary to dry the paste and evaporate the binding agent. Preheating duration: 45 minutes at 45 °C. WAVE SOLDERING This text gives a very brief insight to a complex technology. A more in-depth account of soldering ICs can be found in our “IC Package Databook” (order code 9398 652 90011). Wave soldering techniques can be used for all SO packages if the following conditions are observed: • A double-wave (a turbulent wave with high upward pressure followed by a smooth laminar wave) soldering technique should be used. DIP SOLDERING BY DIPPING OR BY WAVE • The longitudinal axis of the package footprint must be parallel to the solder flow. The maximum permissible temperature of the solder is 260 °C; solder at this temperature must not be in contact with the joint for more than 5 seconds. The total contact time of successive solder waves must not exceed 5 seconds. • The package footprint must incorporate solder thieves at the downstream end. During placement and before soldering, the package must be fixed with a droplet of adhesive. The adhesive can be applied by screen printing, pin transfer or syringe dispensing. The package can be soldered after the adhesive is cured. The device may be mounted up to the seating plane, but the temperature of the plastic body must not exceed the specified maximum storage temperature (Tstg max). If the printed-circuit board has been pre-heated, forced cooling may be necessary immediately after soldering to keep the temperature within the permissible limit. Maximum permissible solder temperature is 260 °C, and maximum duration of package immersion in solder is 10 seconds, if cooled to less than 150 °C within 6 seconds. Typical dwell time is 4 seconds at 250 °C. REPAIRING SOLDERED JOINTS A mildly-activated flux will eliminate the need for removal of corrosive residues in most applications. Apply a low voltage soldering iron (less than 24 V) to the lead(s) of the package, below the seating plane or not more than 2 mm above it. If the temperature of the soldering iron bit is less than 300 °C it may remain in contact for up to 10 seconds. If the bit temperature is between 300 and 400 °C, contact may be up to 5 seconds. REPAIRING SOLDERED JOINTS Fix the component by first soldering two diagonallyopposite end leads. Use only a low voltage soldering iron (less than 24 V) applied to the flat part of the lead. Contact time must be limited to 10 seconds at up to 300 °C. When using a dedicated tool, all other leads can be soldered in one operation within 2 to 5 seconds between 270 and 320 °C. SO REFLOW SOLDERING Reflow soldering techniques are suitable for all SO packages. Reflow soldering requires solder paste (a suspension of fine solder particles, flux and binding agent) to be applied to the printed-circuit board by screen printing, stencilling or pressure-syringe dispensing before package placement. 1996 Jul 29 14 Philips Semiconductors Preliminary specification Ground noise isolation amplifier TDA8575 DEFINITIONS Data sheet status Objective specification This data sheet contains target or goal specifications for product development. Preliminary specification This data sheet contains preliminary data; supplementary data may be published later. Product specification This data sheet contains final product specifications. Limiting values Limiting values given are in accordance with the Absolute Maximum Rating System (IEC 134). Stress above one or more of the limiting values may cause permanent damage to the device. These are stress ratings only and operation of the device at these or at any other conditions above those given in the Characteristics sections of the specification is not implied. Exposure to limiting values for extended periods may affect device reliability. Application information Where application information is given, it is advisory and does not form part of the specification. LIFE SUPPORT APPLICATIONS These products are not designed for use in life support appliances, devices, or systems where malfunction of these products can reasonably be expected to result in personal injury. Philips customers using or selling these products for use in such applications do so at their own risk and agree to fully indemnify Philips for any damages resulting from such improper use or sale. 1996 Jul 29 15 Philips Semiconductors – a worldwide company Argentina: see South America Australia: 34 Waterloo Road, NORTH RYDE, NSW 2113, Tel. +61 2 9805 4455, Fax. +61 2 9805 4466 Austria: Computerstr. 6, A-1101 WIEN, P.O. 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Reproduction in whole or in part is prohibited without the prior written consent of the copyright owner. The information presented in this document does not form part of any quotation or contract, is believed to be accurate and reliable and may be changed without notice. No liability will be accepted by the publisher for any consequence of its use. Publication thereof does not convey nor imply any license under patent- or other industrial or intellectual property rights. Printed in The Netherlands 517021/10/01/pp16 Date of release: 1996 Jul 29 Document order number: 9397 750 00985