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ZN429D Datasheet(PDF) 3 Page - List of Unclassifed Manufacturers |
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ZN429D Datasheet(HTML) 3 Page - List of Unclassifed Manufacturers |
3 / 7 page ZN429 NOTE 1: Monotonic over full temperature range. Parameter Symbol Min. Typ. Max. Units Conditions Converter Resolution 8 - - bits Accuracy 8 - - bits Non-linearity - - ±0.5 LSB Differential non-linearity - ±0.5 - LSB Note 1 Settling time to 0.5LSB - 1.0 - µs 1 LSB step Settling time to 0.5LSB - 2.0 - µs All bits ON to OFF or OFF to ON Offset voltage ZN429E8, ZN429D VOS - 3.0 5.0 mV All bits OFF VOS temperature coefficient - 5 - µV/°C Full-scale output 2.545 2.550 2.555 V All bits ON Ext. VREF = 2.56V Full-scale temp. coefficient - 3 - ppm/ °C Ext. VREF = 2.560V Non-linearity temp. coefficient - 7.5 - ppm/ °C Relative to F.S.R. Analog output resistance RO -10 - k Ω External reference voltage 0 - 3.0 V Supply voltage VCC 4.5 - 5.5 V Supply current IS -5 9 mA High level input voltage VIH 2.0 - - V Low level input voltage VIL - - 0.7 V High level input current IIH -- 10 µAV CC = max. VI = 2.4V - - 100 µAV CC = max. VI = 5.5V Low level input current IIL - - -0.18 mA VCC = max. VI = 0.3V ELECTRICAL CHARACTERISTICS (at Tamb = 25°C and VCC = +5V unless otherwise specified) INTRODUCTION The ZN429 is an 8-bit D-A converter. It contains an advanced design of R-2R ladder network and an array of precision bipolar switches on a single monolithic chip. The special design of the ladder network results in full 8-bit accuracy using normal diffused resistors. The converter is of the voltage switching type and uses an R-2R resistor ladder network as shown in Fig.3. Each 2R element is connected either to 0V or VREF by transistor switches specially designed for low offset voltage (typically 1mV). Binary weighted voltages are produced at the output of the R-2R ladder, the value depending on the digital number applied to the bit inputs. An external fixed or varying reference is required which should have a slope resistance less than 2 Ω. Suggested external reference sources are the ZN404 or one of the ZN458 range. Each ZN404 is capable of supplying up to five ZN429 circuits and this is increased to ten for the ZN458 range. |
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