XL1403

X/DL1403 + 5.0 V 1 X/DL1403 2 2.5
V Full Scale Adjust 500  1.0 k R1 3 R2 Reference Amplifier IRef *0.1 F C1 Monolithic D/A Converter 1.2 k R3 * Caution: System stability may be affected if output capacitance * exceeds 1.0 F. Using higher capacitance values is not * recommended and should be carefully considered. Figure 1. A Reference for Monolithic D/A Converters Providing the Reference Current for ON Semiconductor Monolithic D/A Converters The resistor R3 improves temperature performance by matching the impedance on both inputs of the D/A reference amplifier. The capacitor decouples any noise present on the reference line. It is essential if the D/A converter is located any appreciable distance from the reference. A single X/DL1403 reference can provide the required current input for up to five of the monolithic D/A converters. The X/DL1403 makes an ideal reference for many monolithic D/A converters, requiring a stable current reference of nominally 2.0 mA. This can be easily obtained from the X/DL1403 with the addition of a series resistor, R1. A variable resistor, R2, is recommended to provide means for full− scale adjust on the D/A converter. ELECTRICAL CHARACTERISTICS (Vin = 15 V, TA = 25°C, unless otherwise noted.) Characteristic Symbol Min Typ Max Unit Vout 2.475 2.5 2.525 V
VO/
T − 10 40 ppm/°C Output Voltage (IO = 0 mA) Temperature Coefficient of Output Voltage* X/DL1403 Output Voltage Change* (Over specified temperature range) XD1403 B 0 to + 70°C XL1403 −40 to + 85 °C
VO mV − − − − 7.0 12.5 − − 1.2 0.6 4.5 3.0 Line Regulation (IO = 0 mA) (15 V  VI  40 V) (4.5 V  VI  15 V) Regline Load Regulation (0 mA < IO < 10 mA) Regload − − 10 mV IQ − 1.2 1.5 mA Quiescent Current (IO = 0 mA) *Guaranteed but not tested. 2 mV X/DL1403 Vin 2.0 k 2.0 k 2.0 k 2.0 k 1.0 k 32 Vout 1.5 k C1 30 pF 10 k 1.73
k 2.37 k 1.0 k 5.61 k This device contains 15 active transistors. Figure 2. X/DL1403 Schematic 3 1.483 k ∆Vout , CHANGE IN OUTPUT VOLTAGE (mV) X/DL1403 ∆ Vout , CHANGE IN Vout (mV) 2.0 1.0 25°C 0 −1.0 0°C −2.0 75°C −3.0 −4.0 −5.0 −6.0 0 10 20 30 Vin, INPUT VOLTAGE (V) 40 10 9.0 8.0 7.0 6.0 5.0 4.0 75°C 3.0 2.0 0°C 1.0 0 50 25°C 0 1.0 2.0 3.0 4.0 5.0 6.0 7.0 Iout, OUTPUT CURRENT (mA) 8.0 9.0 10 Figure 4. Change in Output Voltage versus Load Current Figure 3. Typical Change in Vout versus Vin (Normalized to Vin = 15 V @ TC = 25°C) (Normalized to Vout @ Vin = 15 V, Iout = 0 mA) ∆ Vout , CHANGE IN Vout (mV) 1.20 1.15 1.10 1.05 1.00 0.95 0.90 Iout = 2 mA Vin = 15 V 0 −2.0 Vin = 5.0 V −4.0 −6.0 −8.0 −10 −12 0 −40 −30 −20 −10 0 10 20 30 40 50 TA, TEMPERATURE (°C) 60 70 −14 −40 −30 −20 −10 80 85 0 10 20 30 40 50 TA, TEMPERATURE (°C) 60 70 80 85 Figure 5. Quiescent Current versus Temperature Figure 6. Change in Vout versus Temperature (Vin = 15 V, Iout = 0 mA) (Normalized to Vout @ Vin = 15 V) 4.0 ∆ Vout , CHANGE IN Vout (mV) I1, QUIESCENT CURRENT (mA) 1.25 2.0 IO = 0 mA = 2.0 mA 0 −2.0 = 8.0 mA −4.0 = 5.0 mA −6.0 −8.0 −10 −12 −40 −30 −20 −10 0 10 20 30 40 50 60 70 80 85 TA, TEMPERATURE (°C) Figure 7. Change in Vout versus Temperature (Normalized to TA = 25°C, Vin = 15 V, Iout = 0 mA) 4 X/DL1403 3−1/2−Digit Voltmeter − Common Anode Displays, Flashing Overrange is done by dividing the EOC pulse rate by 2 with 1/2 14013B flip−flop and blanking the display using the blanking input of the 14543B. The display uses an LED display with common anode digit lines driven with an 14543B decoder and an X/DL1403 LED driver. The X/DL1403 contains 7 Darlington transistor drivers and resistors to drive the segments of the display. The digit drive is provided by four MPS−A12 Darlington transistors operating in an emitter−follower configuration. The 14543B, 14013B and LED displays are referenced to VEE via Pin 13 of the 14433. This places the full power supply voltage across the display. The current for the display may be adjusted by the value of the segment resistors shown as 150  in Figure 8. An example of a 3−1/2−digit voltmeter using the 14433 is shown in the circuit diagram of Figure 8. The reference voltage for the system uses an X/DL1403 2.5 V reference IC. The full scale potentiometer can calibrate for a full scale of 199.9 mV or 1.999 V. When switching from 2.0 V to 200 mV operation, RI is also changed, as shown on the diagram. When using RC equal to 300 k, the clock frequency for the system is about 66 kHz. The resulting conversion time is approximately 250 ms. When the input is overrange, the display flashes on and off. The flashing rate is one−half the conversion rate. This X/DL1403 20 k 2 −5.0 V 0.1
F +5.0 V 3 0.1
F 300 k RC 11 10 VX 2 14433 0.1 F ** 13 7 8 0.1 F 4 1 2 3 5 23 22 21 20 4 5 6 +5.0 V 0.1 F 12 24 3 1 RI * +5.0 V 0.1 F −5.0 V 16 9 10 11 12 13 14 15 6 7 8 9 14 −5.0 V Segment Resistors 150  (7) 7 6 5 4 3 2 1 X/DL1403 1 14543B +5.0 V −5.0 V −5.0 V 15 19 18 17 16 5.0 V DS1 DS2 −5.0 V 6 5 DS3 3 DS4 D C S R Q Q 1 2 51 k 14013B 4 +5.0 V 8 9 D S Q 13 11 C Q 12 R 7 10 14 * RI = 470 k for 2.0 V Range RI = 27 k for 200 mV Range ** Mylar Capacitor 10 11 12 13 14 15 16 −5.0 V 50 F −5.0 V +5.0 V Figure 8. 3−1/2−Digit Voltmeter 5 Minus Sign f g e d c b a 200  MPS−A12 Plus Sign 110  Common Anode LED Display 0.1 F MPS−A12 (4) X/DL1403 6 X/DL1403 7