ZN428E8 Просмотр технического описания (PDF) - Unspecified

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ZN428E8

8-BIT LATCHED INPUT D-A CONVERTER

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ZN428

Fig.4 Analog output equivalent circuit

Fig.4 shows equivalent circuit of the output (ignoring

VOS). The output resistance R has a temperature coefficient

of +0.2% per °C.

The gain drift due to this is 0.2R % per °C.

R+RL

RL should be chosen as large as possible to make the

gain drift small. As an example if RL = 400kΩ then the gain

drift due to the T.C. of R for a 100°C change in ambient

temperature will be less than 0.2%. Alternatively the ZN428

can be buffered by an amplifier (see Operating Notes).

REFERENCE

(a) Internal Reference

The internal reference is an active bandgap circuit which

is equivalent to a 2.5V Zener diode with very low slope

impedance (Fig.5). A resistor (RREF), should be connected

between +VCC (pin 10) and pin 7. The recommended value

of 390Ω will supply a nominal reference current of (5.0-

2.5)/0.39 = 6.4mA. A stabilising/decoupling capacitor CREF =

1µF is required between pins 7 and 8 for internal reference

option, VREF OUT (pin 7) being connected to VREF IN (pin 6).

Fig.5 Internal voltage reference

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