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| HA17408P 8-Bit Multiplying Digital-to-Analog Converter Description The HA17408P is an 8-bit monolithic D/A converter that incorporates a reference current amplifier, an R-2R resistor ladder, and eight high-speed current switches. Circuit designers can set the maximum output current to match the needs of their applications by setting the reference voltage and selecting a resistor value. The reference current is distributed to the current value for each bit by the R-2R resistor ladder, and thus the maximum output current is 255/256 times the reference current. For example, the largest output current that can be acquired for a reference input current of 2.0 mA is 1.992 mA. The HA17408P can be used in a wide range of applications including CRT displays, stepping motor control, programmable power supplies, audio equipment, and attenuators. Features * * * * * * A linearity of 0.19% ( 1/2 LSB) is guaranteed. Short centering time (250 ns typical) for rapid conversions Low power dissipation: 157 mW typical Compatible with TTL and CMOS logic Standard supply voltages of VCC = +5.0 V, VEE = -5.0 V and = -15.0 V Wide output voltage range: +0.5 to -5.0 V 475 HA17408P Pin Arrangement Block Diagram 476 HA17408P Absolute Maximum Ratings (Ta = 25C) Item Power-supply voltage Symbol VCC VEE Digital input voltage Output voltage Reference current Reference amplifier input voltage range Allowable power dissipation Operating temperature Storage temperature V5 to V12 VO I14 VREF PT Topr Tstg Rated Value 5.5 -16.5 0 to +5.5 0.5 to -5.2 5.0 VCC, VEE 625 -20 to +75 -55 to +125 Unit V V V V mA V mW C C Electrical Characteristics (VCC = 5.0 V, VEE = -15 V, Iref = 2 mA, Ta = 25C) Item Relative error Settling time ( 1/2 LSB) Transmission delay time Maximum output current drift Digital input level Symbol Min ER ts -- -- Typ -- 250 30 20 -- -- 0 -0.002 -1.0 2.0 2.0 1.99 0 -- -- 4.0 Max 0.19 -- 100 -- -- 0.8 0.04 -- -- 2.1 4.2 2.1 4.0 +0.5 +0.5 -- Unit %FS ns ns ppm/C V V mA mA A mA mA mA A V V mA/s VEE = -5.0 V VEE = -7.0 to -15 V Vref = 2.000 V, R 14 = 1.000 All bits low VEE = -5 V VEE < -10 V VIH = 5.0 V VIL = 0.8 V All bits OFF ON Test Condition tPLH , tPHL -- TCIO VIH VIL IIH IIL I15 IOR IO IO (min) VO STIref -- 2.0 -- -- -0.8 -3.0 0 0 1.9 -- -0.6 -5.0 -- Digital input current Reference input bias current Output current range Output current Output voltage range Reference current slew rate 477 HA17408P Electrical Characteristics (VCC = 5.0 V, VEE = -15 V, Iref = 2 mA, Ta = 25C) (cont) Item Current drain Symbol Min ICC IEE Power-supply voltage Power dissipation VCC VEE PT -- -13 4.5 -16.5 -- -- -- -- Typ 1.9 -5.8 5.0 -15 34 97 34 97 Max 14 -- 5.5 -4.5 136 265 -- -- Unit mA mA V V mW mW mW mW All bits low All bits high VEE = -5.0 V VEE = -15 V VEE = -5.0 V VEE = -15 V Test Condition Settling Time Test Circuit 478 |
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