INTEGRATED CIRCUITS DATA SHEET TZA1025 Data amplifier and laser supply circuit for CD audio and video optical systems (ADALASLC) Product specification File under Integrated Circuits, IC01 1998 Oct 30 Philips Semiconductors Product specification Data amplifier and laser supply circuit for CD audio and video optical systems (ADALASLC) TZA1025 FEATURES • Supports a wide range of voltage output mechanisms • RF amplifier designed for audio and video applications with 1 × data rate • Programmable RF gain for CD-Audio/Video (CD-A/V) and CD-Read/Write (CD-R/W) discs • Equalizer for optimal performance • Fully Automatic Laser Power Control (ALPC) including stabilization plus a separate laser supply voltage for power efficiency The RF bandwidth allows this device to be used in CD-A/V applications with a data rate of n = 1 times speed. The RF gain can be adapted for CD-A/V discs or CD-R/W discs by means of the gain select signal. • Adjustable current range of ALPC output • Automatic N- or P-substrate monitor diode selection The equalizer ensures an optimal performance. • Adjustable laser bandwidth and laser switch-on current slope using external capacitor The TZA1025 can be adapted to a wide range of voltage output mechanisms by means of external resistors. • Protection circuit to prevent laser damage due to laser supply voltage dip The ALPC circuit will maintain control over the laser diode current. With an on-chip reference voltage generator, a constant and stabilized output power is ensured independent of ageing. The ALPC can accommodate N- or P-substrate monitor diodes. • Optimized interconnection between data amplifier and Philips’ digital signal processor CD10LC (SAA7325) • Wide supply voltage range • Power-down switch to reduce power consumption during standby A separate supply voltage connection for the laser allows the internal power dissipation to be reduced by connecting a low voltage supply. The laser output current range can be optimized to fit the requirements of the laser diode by means of one external resistor. When a DC-to-DC converter is used, in combination with the control loop of the ALPC, the adjustable output current range provides the possibility to compensate for the extra gain a DC-to-DC converter introduces in the control loop. • Low power consumption. GENERAL DESCRIPTION The TZA1025 is a data amplifier and laser supply circuit for voltage output mechanisms found in a wide range of audio and video CD systems. The device contains an RF amplifier and an automatic laser power control circuit. The preamplifier forms an interface for voltage output CD mechanisms to the Philips’ digital signal processor CD10LC (SAA7325). ORDERING INFORMATION TYPE NUMBER TZA1025T 1998 Oct 30 PACKAGE NAME SO14 DESCRIPTION plastic small outline package; 14 leads; body width 3.9 mm 2 VERSION SOT108-1 Philips Semiconductors Product specification Data amplifier and laser supply circuit for CD audio and video optical systems (ADALASLC) TZA1025 QUICK REFERENCE DATA SYMBOL PARAMETER CONDITIONS MIN. TYP. MAX. UNIT Supplies VDD supply voltage 2.4 − 5.5 V IDD supply current − 3 − mA VDD(L) laser supply voltage 2.4 − 5.5 V RF flatness delay − − 10 ns 80 − − mA N-substrate monitor diode − 0.150 − V P-substrate monitor diode − VDD − 0.150 − V 0 − 70 °C RF amplifier td(f)(RF) Laser supply circuit Io(LASER)(max) maximum laser output current Vi(mon) monitor input voltage VDD(L) − Vo(LASER) = 0.55 V Temperature range Tamb operating ambient temperature BLOCK DIAGRAM VDD handbook, full pagewidth 13 CDRW 11 12 9 DIN 5 10 TZA1025 8 250 kHz V/I MON 1 (1) 4 RFFB RFEQO CMFB LD VGAP 14 V/I 3 VDD 6 7 2 MBK902 GND VDD(L) (1) Band gap reference voltage. Fig.1 Block diagram. 1998 Oct 30 GND 3 RGADJ CFIL PWRON Philips Semiconductors Product specification Data amplifier and laser supply circuit for CD audio and video optical systems (ADALASLC) The gain of the RF amplifier can be adjusted by the external input resistors. Fig.3 shows the simplified schematic which can be used to determine the RF gain. The signal is AC coupled to the RF amplifier. The formula to determine the gain is shown below: Z tr ( RF ) G RF = – n × -----------------(1) R2 PINNING SYMBOL PIN DESCRIPTION LD 1 current output to laser diode VDD(L) 2 laser supply voltage CFIL 3 external filter capacitor TZA1025 MON 4 laser monitor diode input DIN 5 central diode input GND 6 ground GRF is the RF amplifier gain PWRON 7 power-on select input n is the number of input resistors CMFB 8 common mode feedback voltage input Ztr(RF) is the transimpedance of the amplifier (Ω) RFFB 9 external RF feedback resistor RFEQO 10 RF amplifier output CDRW 11 gain select input for CD-A/V, CD-R/W GND 12 ground VDD 13 supply voltage RGADJ 14 external laser supply gain adjust resistor where: R2 is the value of the input resistors (Ω). The gain can be increased by a factor of 4 by making pin CDRW HIGH. The value of Ztr(RF) is 9.8 kΩ for CD-A/V (CDRW = LOW) and 38 kΩ for CD-R/W (CDRW = HIGH). An internal equalizer ensures an optimal performance. The DC output level of the amplifier can be set by applying a DC voltage on the common mode feedback pin CMFB. Since the input signal is AC-coupled the RF output voltage will swing (symmetrically) around this DC level. The coupling of the TZA1025 to the signal processor (SAA7325) can be either AC or DC. When an AC-coupling is chosen (see Fig.6) the minimum supply voltage can be applied. When a DC-coupling is chosen (see Fig.7) a minimum supply voltage of 2.8 V is required. handbook, halfpage LD 1 14 RGADJ VDD(L) 2 13 VDD CFIL 3 12 GND MON 4 TZA1025 11 CDRW DIN 5 10 RFEQO GND 6 9 RFFB 8 CMFB PWRON 7 MBK901 handbook, halfpage Vin Fig.2 Pin configuration. Vin 10 kΩ R2(1) R2(2) C2 RFEQO FUNCTIONAL DESCRIPTION Vin R2(n) CDRW The TZA1025 consists of two sections, the RF amplifier and the automatic laser power control circuit. RF amplifier The RF amplifier consists of a current input amplifier, an equalizer/bandwidth section and a transimpedance output amplifier with an external feedback resistor of 10 kΩ (fixed value). 1998 Oct 30 Fig.3 Simplified schematic. 4 MGL530 Philips Semiconductors Product specification Data amplifier and laser supply circuit for CD audio and video optical systems (ADALASLC) TZA1025 where: Automatic laser power control circuit Io is output current (mA) The ALPC stabilises the laser output power thereby reducing the effect of ageing of the laser. Io(LASER)(max) is the maximum laser output current (mA) 250 is a fixed internal resistor value (Ω) The TZA1025 automatically detects when an N- or P-substrate monitor diode is used and selects the correct reference voltage. A simplified diagram for the use of an N- or P-substrate monitor diode is given in Fig.4. RRGADJ is the value of the external resistor (Ω). The bandwidth of the loop is determined by the external filter capacitor CCFIL and the loop gain. The formula to determine the bandwidth is shown in equation (4). The gain of the loop can be controlled (reduced) by adding an external resistor between pins RGADJ and GND. The loop gain then becomes: 250 G loop = G ALPC × G lm × G con × ------------------------------------(2) 250 + R RGADJ 6 τ -3dB C CFIL × 16 ⋅ 10 = ----------------------------------------G loop (4) where: where: CCFIL is the value of the capacitor (F) Gloop is the loop gain Gloop is the loop gain. GALPC is the ALPC transfer (60 A/V) The TZA1025 has a protection circuit to prevent laser damage that can occur due to a dip of VDD(L). When a dip occurs the output transistor (see Fig.4) will go into saturation making it unable to supply the required laser current. Without the protection circuit the ALPC would still try to supply the required laser current by charging the filter capacitor CCFIL. After the dip a fully charged capacitor would create a large output current during the few milliseconds it needs to discharge the capacitor to a normal level. The protection circuit monitors the output transistor and switches off the ALPC when saturation occurs by discharging the capacitor. The ALPC will automatically restart within a few milliseconds after the dip has passed. Glm is the laser-to-monitor transfer (V/A) Gcon is the extra gain introduced when a DC-to-DC converter is used in the loop; Gcon = 1 when no DC-to-DC converter is used 250 is a fixed internal resistor value (Ω) RRGADJ is the value of the external resistor (Ω). The minimum available output current is also reduced when an external resistor is used. The formula to determine the minimum available output current is shown in equation (3). 250 (3) I o = I o(LASER)(max) × ------------------------------------250 + R RGADJ VDD(L) handbook, full pagewidth VDD(L) VDD VDD − 150 mV 150 mV DC-TO-DC CONVERTER DC-TO-DC CONVERTER CCFIL CCFIL MGR519 a. N-substrate monitor diode. b. P-substrate monitor diode. Fig.4 Automatic Laser Power Control (ALPC) loop. 1998 Oct 30 5 Philips Semiconductors Product specification Data amplifier and laser supply circuit for CD audio and video optical systems (ADALASLC) TZA1025 LIMITING VALUES In accordance with the Absolute Maximum Rating System (IEC 134). SYMBOL PARAMETER CONDITIONS MIN. MAX. UNIT VDD supply voltage −0.5 +5.5 V VDD(L) laser supply voltage −0.5 +5.5 V Vi(n) input voltage on pins 3, 4, 7, 8, 10, 11, 12 and 14 note 1 −0.5 VDD + 0.5 V Vo(LASER) laser output voltage note 2 −0.5 VDD(L) + 0.5 V Vi(DIN) central diode input voltage note 3 −0.5 − V Ii(DIN) central diode input current note 4 −1 +1 mA Vi(RFFB) RF feedback voltage note 3 −0.5 − V Ii(RFFB) RF feedback current note 4 −1 +1 mA Ves electrostatic handling human body model; note 5 −2000 +2000 V machine model; note 6 Tamb operating ambient temperature −250 0 +250 V 70 °C Notes 1. The maximum value VDD + 0.5 must not exceed 5.5 V. 2. The maximum value VDD(L) + 0.5 must not exceed 5.5 V. 3. Pins DIN and RFFB are current inputs with a limitation on the maximum input current. 4. The maximum peak current must not exceed ten times the absolute average input current with a maximum for the absolute average input current of 1 mA. Averaging is only allowed over a maximum time interval of 100 ms. 5. Equivalent to discharging a 100 pF capacitor via a 1.5 kΩ series resistor with a rise time of 15 ns. 6. Equivalent to discharging a 200 pF capacitor via a 2.5 µH series inductor. QUALITY SPECIFICATION In accordance with “SNW-FQ-611-E”. 1998 Oct 30 6 Philips Semiconductors Product specification Data amplifier and laser supply circuit for CD audio and video optical systems (ADALASLC) TZA1025 CHARACTERISTICS VDD = 2.4 V; VDD(L) − Vo(LASER) = 0.55 V; Ii(DIN) = 0 mA; Io(LASER) = 80 mA; VCMFB = 1⁄2VDD; PWRON = HIGH; CDRW = LOW; CCFIL = 10 nF; RRFFB = 10 kΩ; pin RGADJ connected to ground; Tamb = 25 °C; unless otherwise specified. SYMBOL PARAMETER CONDITIONS MIN. TYP. MAX. UNIT Supplies 2.4 − 5.5 laser supply voltage 2.4 − 5.5 V supply current − 3 − mA − − 40 µA VDD supply voltage VDDL(L) IDD Iq quiescent supply current PWRON = LOW V RF amplifier Ii(DIN) central diode input current −70 − +70 µA Zi(DIN) central diode input impedance − 100 − Ω VCMFB common mode feedback input voltage 0.7 1⁄ VDD − 0.4 V VO(RFEQO) RF amplifier output DC-level 2VDD CDRW = LOW VCMFB − 0.05 − VCMFB + 0.25 V CDRW = HIGH VCMFB − 0.35 − VCMFB + 0.35 V Vo(RFEQO) RF amplifier output voltage Zo(RFEQO) RF amplifier output impedance td(f)(RF) RF flatness delay GRF RF path gain boost f = 720 kHz; note 2 Ztr(RF) RF transimpedance note 3 note 1 CDRW = LOW CDRW = HIGH 0.25 − VDD − 0.25 V − 100 − Ω − − 10 ns − 5 − dB 9.2 9.8 10.4 kΩ 35.6 38 40.4 kΩ THDRF RF total harmonic distortion note 4 − −50 − dB PSRRRF RF power supply ripple rejection 0 to 100 kHz − 40 − dB Vn(in-band)(rm in-band noise (RMS value) note 4 − 2.7 − mV note 5 0.55 − 5.5 V Vdrop = 0.55 V; note 6 80 − − mA Io(LASER) = 53 mA − 500 − Ω Io(LASER) = 20 mA − 1200 − Ω s) Laser supply circuit Vdrop drop voltage Io(LASER)(max maximum laser output current ) Zo(LASER) 1998 Oct 30 laser output impedance Vdrop = 0.55 V; note 7 7 Philips Semiconductors Product specification Data amplifier and laser supply circuit for CD audio and video optical systems (ADALASLC) SYMBOL PARAMETER CONDITIONS TZA1025 MIN. TYP. MAX. UNIT monitor input voltage Vi(mon) Ii(mon) N-substrate 0.132 0.150 0.168 V P-substrate VDD − 0.168 VDD − 0.150 VDD − 0.132 V −200 − +200 nA monitor input current − 3 − ms RSref reference supply rejection note 8 − − 5 % Vclamp ALPC clamp voltage note 9 − − 0.5 V tsw(on)(LASER) laser switch-on time Control inputs Zi(pd) pull-down input impedance pin CDRW − 200 − kΩ Zi(pu) pull-up input impedance pin PWRON − 200 − kΩ VIL LOW-level input voltage pin CDRW −0.2 − 1⁄ 3VDD V pin PWRON −0.2 − 1⁄ 3VDD V pin CDRW 2⁄ 3VDD − VDD + 0.2 V pin PWRON 2⁄ 3VDD − VDD + 0.2 V HIGH-level input voltage VIH Notes 1. Closed-loop output impedance (10 kΩ feedback resistor connected between pins RFEQO and RFFB). 2. GRF = (GRFEQO at fEQ) − (GRFEQO at 720 kHz). 3. Values to be used in equation (1). 4. An RF filter of 1 kΩ and 47 pF should be used on the RF output. 5. Vdrop = VDD(L) − Vo(LASER). 6. An external resistor can be used to reduce the maximum output current (and the gain) of the laser supply; see equation (4). 7. The output impedance strongly depends on the drop voltage (Vdrop). The output impedance will approximately double when the drop voltage doubles. 8. RS ref ∆V mon ----------------V mon = ----------------∆V DD --------------V DD 9. When a voltage dip at VDD(L) occurs it could cause peak currents on Io(LASER) coming out of the ALPC output. To protect the laser against such peak currents a protection circuit will switch-off the laser current when Vdrop becomes lower than Vclamp. When Vdrop > Vclamp the laser will switch-on automatically again. 1998 Oct 30 8 Philips Semiconductors Product specification Data amplifier and laser supply circuit for CD audio and video optical systems (ADALASLC) MGR520 12 handbook, halfpage (2) 254 td (ns) G (dB) (1) 8 252 4 250 0 248 −4 10−1 1 (1) Gain. (2) Delay. Definition of delay: f (MHz) 246 10 ϕ -------- 360- t d = ----------------f Fig.5 Equalizer gain and delay. 1998 Oct 30 9 TZA1025 Philips Semiconductors Product specification Data amplifier and laser supply circuit for CD audio and video optical systems (ADALASLC) TZA1025 APPLICATION INFORMATION The application for the TZA1025 (ADALASLC) with the SAA7325 (CD10LC) using a coupling capacitor of 3.3 nF is shown in Fig.6. VDD(LASER) handbook, full pagewidth LD VDD LD 100 nF VDD(L) 10 nF CFIL MON MON VDD DIN GND PWRON VCOM 1 14 2 13 3 12 4 RRGADJ(1) 100 nF VDD GND TZA1025 11 CDRW (ADALASLC) 5 10 6 9 7 RGADJ from microprocessor(2) 8 1 kΩ 3.3 nF RFEQO RFFB CMFB HFIN 47 pF 10 kΩ(3) HFREF 22 kΩ ISLICE 100 nF 100 nF SAA7325 OPU LDON (CD10LC) VRIN C2(4) R2 (4×) D1 D1 D2 D2 D3 D3 D4 D4 S1 S1 S2 S2 LF FILTER 6 × 220 pF (1) See equation (3) to calculate the value of this resistor. (2) Pin CDRW can be controlled by the CD10LC or a microprocessor but can also be fixed or switched by any other means. (3) The 10 kΩ feedback resistor between pins 9 and 10 is a fixed value. R2 ( Ω ) × C2 ( F ) (4) The high-pass filter (AC-coupling) is placed at the input of the preamplifier. The −3 dB point (f = 10 kHz) is at --------------------------------------------4 Fig.6 Application diagram with SAA7325 (CD10LC) using a coupling capacitor. 1998 Oct 30 10 MBK903 Philips Semiconductors Product specification Data amplifier and laser supply circuit for CD audio and video optical systems (ADALASLC) TZA1025 The application for the TZA1025 (ADALASLC) with the SAA7325 (CD10LC) without a coupling capacitor is shown in Fig.7. A minimum supply voltage (VDD) is required for optimal performance. VDD(5) VDD(LASER) handbook, full pagewidth LD LD 100 nF VDD(L) 10 nF CFIL MON MON VDD DIN GND PWRON VCOM 1 14 2 13 3 12 4 RGADJ from microprocessor(2) RRGADJ(1) 100 nF VDD GND TZA1025 11 CDRW (ADALASLC) 5 10 6 9 8 7 1 kΩ RFEQO RFFB CMFB HFIN 47 pF 10 kΩ(3) HFREF ISLICE 100 nF 100 nF SAA7325 OPU LDON (CD10LC) VRIN C2(4) R2 (4×) D1 D1 D2 D2 D3 D3 D4 D4 S1 S1 S2 S2 LF FILTER 6 × 220 pF (1) See equation (3) to calculate the value of this resistor. (2) Pin CDRW can be controlled by the CD10LC or a microprocessor but can also be fixed or switched by any other means. (3) The 10 kΩ feedback resistor between pins 9 and 10 is a fixed value. R2 ( Ω ) × C2 ( F ) (4) The high-pass filter (AC-coupling) is placed at the input of the preamplifier. The −3 dB point (f = 10 kHz) is at --------------------------------------------4 (5) The minimum supply voltage (VDD) without using a coupling capacitor is 2.8 V. Fig.7 Application diagram with SAA7325 (CD10LC) without coupling capacitor. 1998 Oct 30 11 MBK904 Philips Semiconductors Product specification Data amplifier and laser supply circuit for CD audio and video optical systems (ADALASLC) TZA1025 PACKAGE OUTLINE SO14: plastic small outline package; 14 leads; body width 3.9 mm SOT108-1 D E A X c y HE v M A Z 8 14 Q A2 A (A 3) A1 pin 1 index θ Lp 1 L 7 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 8.75 8.55 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 0.010 0.057 0.004 0.049 0.01 0.019 0.0100 0.35 0.014 0.0075 0.34 0.16 0.15 0.050 0.028 0.024 0.01 0.01 0.004 0.028 0.012 inches 0.069 0.244 0.039 0.041 0.228 0.016 θ Note 1. Plastic or metal protrusions of 0.15 mm maximum per side are not included. REFERENCES OUTLINE VERSION IEC JEDEC SOT108-1 076E06S MS-012AB 1998 Oct 30 EIAJ EUROPEAN PROJECTION ISSUE DATE 95-01-23 97-05-22 12 o 8 0o Philips Semiconductors Product specification Data amplifier and laser supply circuit for CD audio and video optical systems (ADALASLC) TZA1025 SOLDERING Wave soldering Introduction Wave soldering techniques can be used for all SO packages if the following conditions are observed: 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. • A double-wave (a turbulent wave with high upward pressure followed by a smooth laminar wave) soldering technique should be used. • The longitudinal axis of the package footprint must be parallel to the solder flow. • The package footprint must incorporate solder thieves at the downstream end. This text gives a very brief insight to a complex technology. A more in-depth account of soldering ICs can be found in our “Data Handbook IC26; Integrated Circuit Packages” (order code 9398 652 90011). 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. Reflow soldering Reflow soldering techniques are suitable for all SO packages. 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. 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. A mildly-activated flux will eliminate the need for removal of corrosive residues in most applications. 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. 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. Preheating is necessary to dry the paste and evaporate the binding agent. Preheating duration: 45 minutes at 45 °C. 1998 Oct 30 13 Philips Semiconductors Product specification Data amplifier and laser supply circuit for CD audio and video optical systems (ADALASLC) TZA1025 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. 1998 Oct 30 14 Philips Semiconductors Product specification Data amplifier and laser supply circuit for CD audio and video optical systems (ADALASLC) NOTES 1998 Oct 30 15 TZA1025 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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No. 5, 80640 GÜLTEPE/ISTANBUL, Tel. +90 212 279 2770, Fax. +90 212 282 6707 Ukraine: PHILIPS UKRAINE, 4 Patrice Lumumba str., Building B, Floor 7, 252042 KIEV, Tel. +380 44 264 2776, Fax. +380 44 268 0461 United Kingdom: Philips Semiconductors Ltd., 276 Bath Road, Hayes, MIDDLESEX UB3 5BX, Tel. +44 181 730 5000, Fax. +44 181 754 8421 United States: 811 East Arques Avenue, SUNNYVALE, CA 94088-3409, Tel. +1 800 234 7381 Uruguay: see South America Vietnam: see Singapore Yugoslavia: PHILIPS, Trg N. Pasica 5/v, 11000 BEOGRAD, Tel. +381 11 625 344, Fax.+381 11 635 777 For all other countries apply to: Philips Semiconductors, International Marketing & Sales Communications, Building BE-p, P.O. Box 218, 5600 MD EINDHOVEN, The Netherlands, Fax. +31 40 27 24825 Internet: http://www.semiconductors.philips.com © Philips Electronics N.V. 1998 SCA60 All rights are reserved. 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 545102/00/01/pp16 Date of release: 1998 Oct 30 Document order number: 9397 750 04251