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ZN427E8 Datasheet(PDF) 11 Page - Zarlink Semiconductor Inc |
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ZN427E8 Datasheet(HTML) 11 Page - Zarlink Semiconductor Inc |
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11 / 17 page  ZN427 10 The comparator derives the tail current, I EXT, for its first stage from an external resistor, R EXT, which is taken to a negative supply V–. This arrangement allows the ZN427 to work with any negative supply in the range -3 to -30 volts. the ZN427 is designed to be insensitive to changes in I EXT from 25µA to 150µA. The suggested nominal value of I EXT is 65µA and a suitable value for R EXT is given by REXT = |V_|15kΩ. V – (volts) -3 -5 -10 -12 -15 -20 -25 -30 R EXT (±10%) 47k Ω 82k Ω 150k Ω 180k Ω 220k Ω 330k Ω 390k Ω 470k Ω The output from the D-A converter is connected through the 4k Ω ladder resistance to one side of the comparator. The analog input to be converted could be connected directly to the other comparator input (V IN, pin 6) but for optimum stability with temperature the analog input should be applied through a source resistance (R IN = 4k Ω) to match the ladder resistance). ANALOG INPUT RANGES The basic connection of the ZN427 shown in Fig.13 has an analog input range 0 to V REF IN which, in some applications, may be made available from previous signal conditioning/ scaling circuits. Input voltage ranges greater than this are accommodated by providing an attenuator on the comparator input, whilst for smaller input ranges the signal must be amplified to a suitable level. Bipolar input ranges are accommodated by off-setting the analog input input range so that the comparator always sees a positive input voltage. Fig.13 External components for basic operation LSB BIT 8 MSB BIT 1 VCC (+5V) BUSY 1 18 7 RD 2 17 6 CK 3 16 5 WR 4 15 4 V- (-5V) 5 14 3 AIN 6 13 2 VREFIN 7 12 VREFOUT 8 11 GND (0V) 9 10 RREF (390 Ω) REXT (82k) RIN (4k) VIN CREF (4µ7) DIGITAL OUTPUTS NOMINAL AIN RANGE = 0 TO VREFIN |
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