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MC1408-8D 데이터시트(PDF) 7 Page - ON Semiconductor |
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MC1408-8D 데이터시트(HTML) 7 Page - ON Semiconductor |
7 / 9 page MC1408−8 http://onsemi.com 7 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. 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 W 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 mF supply bypassing for low frequencies, minimum scope lead length, good ground planes, and avoidance of ground loops are all mandatory. 5 6 7 8 9 10 11 12 3 MC1408 13 14 15 1 2 4 16 CO ≤ 25pF R14 0.1 mF RL eIN VEE VCC 15pF 0.1 mF 0.1 mF eO FOR SETTLING TIME MEASUREMENT (ALL BITS SWITCHED LOW TO HIGH) 2.4V 0.4V 1.0V SETTLING TIME 0 0 TRANSIENT RESPONSE −100 mV FOR TURN OFF MEASUREMENT USE RL to GND 1.4V RL = 50W PIN 4 TO GND tS = 70ns TYPICAL TO ±1/2LSB tPLH tPHL tPHL = tPLH = 10ns RL = 500W eIN +2VDC Figure 6. Transient Response and Settling Time INPUTS 5 6 7 8 9 10 11 12 3 MC1408 13 14 15 1 2 4 16 VEE VCC I O + K A 1 2 ) A 2 4 ) A 3 8 ) A 4 16 ) A 5 32 ) A 6 64 ) A 7 128 ) A 8 256 where K + V REF R 14 and AN = “1” IF AN IS AT HIGH LEVEL AN = “0” IF AN IS AT LOW LEVEL DIGITAL IEE IO I15 I14 R14 R15 VO OUTPUT RL VI II (+) ICC VREF(+) (SEE TEXT FOR VALUES OF C) TYPICAL VALUES R14 = R15 = 1k VREF = +2.0V C = 15pF A1 A2 A3 A4 A5 A6 A7 A8 Figure 7. Notation Definitions 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 1.0k W 1.0k W 51 W |
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