ZN425E8

ZN425E8 8-BIT D-A/A-D CONVERTER MAY 1994 DS3005-2.0 The ZN425 is a monolithic 8-bit D-A converter containing an R-2R ladder network of diffused resistors with precision bipolar switches, and in addition a counter and a 2.5V precision voltage reference. The counter is a powerful addition which allows a precision staircase to be generated very simply by clocking the counter. FEATURES s ±1/2 LSB Linearity Error s 0°C to +70°C s TTL and 5V CMOS Compatible s Single +5V Supply s Settling Time (D-A) 1µs Typical s Conversion Time (A-D) 1ms Typical, using Ramp and Compare Technique s Extra Components Required D-A: Reference Capacitor (Direct Voltage Output through 10kOhms Typ.) A-D: Comparator, Gate, Clock and Reference Capacitor ORDERING INFORMATION Ambient operating temperature 0°C to +70°C PackageDP16 GROUND INPUT SELECT COUNTER RESET CLOCK BIT 8 BIT 7 BIT 6 +VCC 1 2 3 4 5 6 7 8 16 VREF OUTPUT 15 VREF INPUT 14 ANALOG OUTPUT 13 BIT 1 (MSB) 12 BIT 2 11 BIT 3 10 BIT 4 9 BIT 5 DP16 Fig.1 Pin connections (not to scale) - top view ABSOLUTE MAXIMUM RATINGS Supply voltage, VCC Max. voltage, logic and VREF inputs Operating temperature range Storage temperature range +7.0V +5.5V See note 3 0°C to +70°C -55°C to +125°C Fig.2 System diagram ZN425 ELECTRICAL CHARACTERISTICS (at Tamb = 25°C and VCC = +5V unless otherwise stated) INTERNAL VOLTAGE REFERENCE Parameter Symbol Min. Typ. Max. Units Output voltage VREF 2.4 2.55 2.7 V Slope resistance RS - 2 4 Ω VREF temperatur...