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| INTEGRATED CIRCUITS MC1408-8 8-bit multiplying D/A converter Product data Supersedes data of 1994 Aug 31 File under Integrated Circuits, IC11 Handbook 2001 Aug 03 Philips Semiconductors Philips Semiconductors Product data 8-bit multiplying D/A converter MC1408-8 DESCRIPTION The MC1408-8 is an 8-bit monolithic digital-to-analog converter which provides high-speed performance with low cost. It is designed for use where the output current is a linear product of an 8-bit digital word and an analog reference voltage. PIN CONFIGURATIONS N Package NC GND VEE 1 2 3 4 5 6 7 8 16 COMPEN 15 VREF(-) 14 V REF(+) 13 V CC 12 A 8 11 A7 10 A6 9 A5 LSB FEATURES * Fast settling time: 70 ns (typ) * Relative accuracy 0.19% (max error) * Non-inverting digital inputs are TTL and CMOS compatible * High-speed multiplying rate 4.0 mA/s (input slew) * Output voltage swing +0.5 V to -5.0 V * Standard supply voltages +5.0 V and -5.0 V to -15 V APPLICATIONS IO MSB A1 A2 A3 A4 D Package1 V+ 1 VREF(+) 2 VREF(-) 3 COMPEN NC GND V- IO 4 5 6 7 8 TOP VIEW NOTE: 1. SO and non-standard pinouts. 16 A8 15 A7 14 A6 13 A5 12 A4 11 A3 10 A2 9 A1 MSB LSB * Tracking A-to-D converters * 2 1/2-digit panel meters and DVMs * Waveform synthesis * Sample-and-Hold * Peak detector * Programmable gain and attenuation * CRT character generation * Audio digitizing and decoding * Programmable power supplies * Analog-digital multiplication * Digital-digital multiplication * Analog-digital division * Digital addition and subtraction * Speech compression and expansion * Stepping motor drive modems * Servo motor and pen drivers ORDERING INFORMATION DESCRIPTION 16-Pin Plastic Dual In-Line Package (DIP) 16-Pin Small Outline (SO) Package SL00048 Figure 1. Pin Configurations TEMPERATURE RANGE 0 C to +70 C 0 C to +70 C ORDER CODE MC1408-8N MC1408-8D DWG # SOT38-4 SOT109-1 2001 Aug 03 2 853-0935 26835 Philips Semiconductors Product data 8-bit multiplying D/A converter MC1408-8 BLOCK DIAGRAM MSB A1 5 A2 6 A3 7 A4 8 A5 9 A6 10 A7 11 LSB A8 12 IO CURRENT SWITCHES 4 R-2R LADDER VREF (+) 14 15 (-) VREF BIAS CURRENT 2 GND 13 REFERENCE CURRENT AMPLIFIER VCC 16 COMPEN VEE 3 NPN CURRENT SOURCE PAIR SL00049 Figure 2. Block Diagram CIRCUIT DESCRIPTION The MC1408-8 consists of a reference current amplifier, an R-2R ladder, and 8 high-speed current switches. For many applications, only a reference resistor and reference voltage need be added. The switches are non-inverting in operation; therefore, a high state on the input turns on the specified output current component. The switch uses current steering for high speed, and a termination amplifier consisting of an active load gain stage with unity gain feedback. The termination amplifier holds the parasitic capacitance of the ladder at a constant voltage during switching, and provides a low impedance termination of equal voltage for all legs of the ladder. The R-2R ladder divides the reference amplifier current into binary-related components, which are fed to the remainder current which is equal to the least significant bit. This current is shunted to ground, and the maximum output current is 255/256 of the reference amplifier current, or 1.992 mA for a 2.0 mA reference amplifier current if the NPN current source pair is perfectly matched. ABSOLUTE MAXIMUM RATINGS SYMBOL VCC VEE V5 - V12 VO I14 V14, V15 PD Tamb Tstg Tsld PARAMETER Positive power supply voltage Negative power supply voltage Digital input voltage Applied output voltage Reference current Reference amplifier inputs Maximum power dissipation, Tamb = 25 C (still-air)1 N package D package Operating temperature range Storage temperature range Lead soldering temperature (10 sec) RATING +5.5 -16.5 0 to VCC -5.2 to +18 5.0 VEE to VCC 1450 1080 0 to +75 -65 to +150 +230 mW mW C C C UNIT V V V V mA NOTES: 1. Derate above 25C, at the following rates: N package at 11.6 mW/C; D package at 8.6 mW/C 2001 Aug 03 3 Philips Semiconductors Product data 8-bit multiplying D/A converter MC1408-8 DC ELECTRICAL CHARACTERISTICS Pin 3 must be 3 V more negative than the potential to which R15 is returned. VCC = +5.0 VDC, VEE = -15 VDC, VREF/R14 = 2.0 mA unless otherwise specified. Tamb = 0 C to 75 C, unless otherwise noted. SYMBOL Er tS tPLH tPHL TCIO VIH VIL IIH IIL I15 IOR IO PARAMETER Relative accuracy Settling time1 Propagation delay time Low-to-High High-to-Low Output full-scale current drift Digital input logic level (MSB) High Low Digital input current (MSB) High Low Reference input bias current Output current range Output current Figure 8 Figure 8 VIH = 5.0 V VIL = 0.8 V Pin 15, Figure 8 Figure 8 VEE = -5.0 V VEE = -7.0 V to -15 V Figure 8 VREF = 2.000 V, R14 = 1000 All bits low Er 0.19% at TA = +25C, Figure 8 VEE = -5V VEE below -10V SRIREF PSRR(-) Reference current slew rate Output current power supply sensitivity Power supply current Positive Negative Power supply voltage range Positive Negative Power dissipation Figure 9 IREF = 1 mA All bits low, Figure 8 0 0 1.9 2.0 0.8 0 -0.4 -1.0 2.0 2.0 1.99 0 0.04 -0.8 -5.0 2.1 4.2 2.1 4.0 mA A mA TEST CONDITIONS Error relative to full-scale IO, Figure 6 To within 1/2 LSB, includes tPLH; Tamb = +25 C, Figure 7 Tamb = +25 C, Figure 7 70 MC1408-8 Min Typ Max 0.19 UNIT % ns 35 -20 100 ns ppm/C VDC mA A IO(min) Off-state VO Output voltage com liance compliance Out ut -0.6 +10 -5.5, +10 8.0 0.5 -0.55, +0.5 -5.0, +0.5 VDC mA/s 2.7 A/V ICC IEE VCCR VEER PD +2.5 -6.5 +4.5 -4.5 +5.0 -15 34 110 +22 -13 +5.5 -16.5 170 305 mA Tamb = +25 C, Figure 8 All bits low, Figure 8 VEE = -5.0 VDC VEE = -15.0 VDC VDC mW NOTES: 1. All bits switched. 2001 Aug 03 4 Philips Semiconductors Product data 8-bit multiplying D/A converter MC1408-8 TYPICAL PERFORMANCE CHARACTERISTICS D-to-A TRANSFER CHARACTERISTICS IO OUTPUT CURRENT (mA) 0 A negative reference voltage may be used if R14 is grounded and the reference voltage is applied to R15, as shown in Figure 5. A high input impedance is the main advantage of this method. The negative reference voltage must be at least 3.0 V above the VEE supply. Bipolar input signals may be handled by connecting R14 to a positive reference voltage equal to the peak positive input level at Pin 15. Capacitive bypass to ground is recommended when a DC reference voltage is used. The 5.0 V logic supply is not recommended as a reference voltage, but if a well regulated 5.0 V supply which drives logic is to be used as the reference, R14 should be formed of two series resistors and the junction of the two resistors bypassed with 0.1 F to ground. For reference voltages greater than 5.0 V, a clamp diode is recommended between Pin 14 and ground. If Pin 14 is driven by a high impedance such as a transistor current source, none of the above compensation methods apply and the amplifier must be heavily compensated, decreasing the overall bandwidth. 1.0 2.0 (00000000) INPUT DIGITAL WORD (11111111) SL00050 Figure 3. Typical Performance Characteristics FUNCTIONAL DESCRIPTION Reference Amplifier Drive and Compensation The reference amplifier input current must always flow into Pin 14. regardless of the setup method or reference supply voltage polarity. Connections for a positive reference voltage are shown in Figure 4. The reference voltage source supplies the full reference current. For bipolar reference signals, as in the multiplying mode, R15 can be tied to a negative voltage corresponding to the minimum input level. R15 may be eliminated and Pin 15 grounded, with only a small sacrifice in accuracy and temperature drift. VCC R14 = R15 14 15 1 MC1408 2 4 16 IO SEE TEXT FOR VALUES OF C. 3 C RL R15 R14 (-)VREF 13 A1 A2 A3 A4 A5 5 6 7 8 9 VCC R14 = R15 14 15 1 MC1408 2 4 16 IO SEE TEXT FOR VALUES OF C. 3 C RL R15 R14 (+)VREF A6 A7 10 11 12 13 A1 A2 A3 A4 A5 A6 A7 A8 10 11 12 5 6 7 8 9 A8 VEE SL00052 Figure 5. Negative VREF Output Voltage Range The voltage at Pin 4 must always be at least 4.5 V more positive than the voltage of the negative supply (Pin 3) when the reference current is 2 mA or less, and at least 8 V more positive than the negative supply when the reference current is between 2 mA and 4 mA. This is necessary to avoid saturation of the output transistors, which would cause serious degradation of accuracy. Philips Semiconductors MC1408-8 does not need a range control because the design extends the compliance range down to 4.5 V (or 8 V -- see above) above the negative supply voltage without significant degradation of accuracy. Philips Semiconductors MC1408-8 can be used in sockets designed for other manufacturers' MC1408 without circuit modification. VEE SL00051 Figure 4. Positive VREF The compensation capacitor value must be increased with increasing values of R14 to maintain proper phase margin. For R14 values of 1.0, 2.5, and 5.0 k, minimum capacitor values are 15, 37, and 75 pF. The capacitor may be tied to either VEE or ground, but using VEE increases negative supply rejection. (Fluctuations in the negative supply have more effect on accuracy than do any changes in the positive supply.) 2001 Aug 03 5 Philips Semiconductors Product data 8-bit multiplying D/A converter MC1408-8 Output Current Range Any time the full-scale current exceeds 2 mA, the negative supply must be at least 8 V more negative than the output voltage. This is due to the increased internal voltage drops between the negative supply and the outputs with higher reference currents. Monotonicity A monotonic converter is one which always provides an analog output greater than or equal to the preceding value for a corresponding increment in the digital input code. The MC1408-8 is monotonic for all values of reference current above 0.5 mA. The recommended range for operation is a DC reference current between 0.5 mA and 4.0 mA. Accuracy Absolute accuracy is the measure of each output current level with respect to its intended value, and is dependent upon relative accuracy, full-scale accuracy and full-scale current drift. Relative accuracy is the measure of each output current level as a fraction of the full-scale current after zero-scale current has been nulled out. The relative accuracy of the MC1408-8 is essentially constant over the operating temperature range because of the excellent temperature tracking of the monolithic resistor ladder. The reference current may drift with temperature, causing a change in the absolute accuracy of output current; however, the MC1408-8 has a very low full-scale current drift over the operating temperature range. The MC1408-8 series is guaranteed accurate to within 1/2 LSB at +25 C at a full-scale output current of 1.99 mA. The relative accuracy test circuit is shown in Figure 6. The 12-bit converter is calibrated to a full-scale output current of 1.99219 mA; then the MC1408-8's full-scale current is trimmed to the same value with R14 so that a zero value appears at the error amplifier output. The counter is activated and the error band may be displayed on the oscilloscope, detected by comparators, or stored in a peak detector. Two 8-bit D-to-A converters may not be used to construct a 16-bit accurate D-to-A converter. 16-bit accuracy implies a total of 1/2 part in 65,536, or 0.00076%, which is much more accurate than the 0.19% specification of the MC1408-8. MSB Settling Time The worst case switching condition occurs when all bits are switched on, which corresponds to a low-to-high transition for all input bits. This time is typically 70 ns for settling to within 1/2LSB for 8-bit accuracy. This time applies when RL < 500 and CO < 25 pF. The slowest single switch is the least significant bit, which typically turns on and settles in 65 ns. In applications where the D-to-A converter functions in a positive going ramp mode, the worst-case condition does not occur and settling times less than 70 ns may be realized. Extra care must be taken in board layout since this usually is the dominant factor in satisfactory test results when measuring settling time. Short leads, 100 F supply bypassing for low frequencies, minimum scope lead length, good ground planes, and avoidance of ground loops are all mandatory. A1 A2 12-BIT A3 D-TO-A A4 CONVERTER (0.02% A5 A6 ERROR MAX) A7 A8 A9 A10 A11 A12 LSB VREF = 2V 100 950 R14 MSB 14 5 6 7 8 9 10 11 12 LSB 15 16 1k VCC 0.1F 0 TO +10V OUTPUT 5k 50k - + NE530 13 ERROR (1V = 1%) 8-BIT COUNTER 4 MC1408 3 C 2 1 VEE SL00053 Figure 6. Relative Accuracy 2001 Aug 03 6 Philips Semiconductors Product data 8-bit multiplying D/A converter MC1408-8 VCC 0.1F 13 5 6 7 8 9 10 11 12 51 0.1F 3 15pF CO 25pF TRANSIENT RESPONSE -100 mV 0 RL = 50 PIN 4 TO GND tPLH tPHL 14 15 1 2 4 16 1.0k 2.4V eIN 0.4V tPHL = tPLH = 10ns 0.1F RL FOR SETTLING TIME MEASUREMENT (ALL BITS eO SWITCHED LOW TO HIGH) 1.0V SETTLING TIME 0 tS = 70ns TYPICAL TO 1/2LSB USE RL to GND FOR TURN OFF MEASUREMENT RL = 500 1.4V +2VDC R14 1.0k MC1408 eIN VEE SL00054 Figure 7. Transient Response and Settling Time VCC ICC 13 A1 A2 A3 A4 A5 A6 A7 A8 (+) VI 5 6 7 8 9 10 11 12 II IEE 3 14 15 1 2 4 16 TYPICAL VALUES R14 = R15 = 1k VREF = +2.0V C = 15pF I14 I15 R15 I VO OUTPUT IO RL O +K A1 2 ) A2 4 ) A3 8 ) A4 16 ) A5 32 ) A6 64 ) A8 A7 ) 128 256 R14 VREF(+) VI AND II APPLY TO INPUTS A1 THROUGH A8 THE RESISTOR TIED TO PIN 15 IS TO TEMPERATURE COMPENSATE THE BIAS CURRENT AND MAY NOT BE NECESSARY FOR ALL APPLICATIONS DIGITAL INPUTS MC1408 where K + V REF R 14 and AN = "1" IF AN IS AT HIGH LEVEL AN = "0" IF AN IS AT LOW LEVEL (SEE TEXT FOR VALUES OF C.) VEE SL00055 Figure 8. Notation Definitions VCC 13 5 6 7 8 9 10 11 12 3 14 15 1 2 4 16 15pF RL = 50 VEE SCOPE dI dt + I dV R L dt 10% 90% 0 2.0mA 1k 1k VREF MC1408 SLEWING TIME SL00056 Figure 9. Reference Current Slew Rate Measurement 2001 Aug 03 7 Philips Semiconductors Product data 8-bit multiplying D/A converter MC1408-8 DIP16: plastic dual in-line package; 16 leads (300 mil) SOT38-4 2001 Aug 03 8 Philips Semiconductors Product data 8-bit multiplying D/A converter MC1408-8 SO16: plastic small outline package; 16 leads; body width 3.9 mm SOT109-1 2001 Aug 03 9 Philips Semiconductors Product data 8-bit multiplying D/A converter MC1408-8 Data sheet status Data sheet status [1] Objective data Preliminary data Product status [2] Development Qualification Definitions This data sheet contains data from the objective specification for product development. Philips Semiconductors reserves the right to change the specification in any manner without notice. This data sheet contains data from the preliminary specification. Supplementary data will be published at a later date. Philips Semiconductors reserves the right to change the specification without notice, in order to improve the design and supply the best possible product. This data sheet contains data from the product specification. Philips Semiconductors reserves the right to make changes at any time in order to improve the design, manufacturing and supply. Changes will be communicated according to the Customer Product/Process Change Notification (CPCN) procedure SNW-SQ-650A. Product data Production [1] Please consult the most recently issued data sheet before initiating or completing a design. [2] The product status of the device(s) described in this data sheet may have changed since this data sheet was published. The latest information is available on the Internet at URL http://www.semiconductors.philips.com. Definitions Short-form specification -- The data in a short-form specification is extracted from a full data sheet with the same type number and title. For detailed information see the relevant data sheet or data handbook. Limiting values definition -- Limiting values given are in accordance with the Absolute Maximum Rating System (IEC 60134). 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 -- Applications that are described herein for any of these products are for illustrative purposes only. Philips Semiconductors make no representation or warranty that such applications will be suitable for the specified use without further testing or modification. Disclaimers Life support -- 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 Semiconductors customers using or selling these products for use in such applications do so at their own risk and agree to fully indemnify Philips Semiconductors for any damages resulting from such application. Right to make changes -- Philips Semiconductors reserves the right to make changes, without notice, in the products, including circuits, standard cells, and/or software, described or contained herein in order to improve design and/or performance. Philips Semiconductors assumes no responsibility or liability for the use of any of these products, conveys no license or title under any patent, copyright, or mask work right to these products, and makes no representations or warranties that these products are free from patent, copyright, or mask work right infringement, unless otherwise specified. Contact information For additional information please visit http://www.semiconductors.philips.com. Fax: +31 40 27 24825 (c) Koninklijke Philips Electronics N.V. 2002 All rights reserved. Printed in U.S.A. Date of release: 01-02 For sales offices addresses send e-mail to: sales.addresses@www.semiconductors.philips.com. Document order number: 9397 750 09381 Philips Semiconductors 2001 Aug 03 10 |
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