MC1408-8N digital integrated circuits Integrated Circuit Chip 8- bit multiplying D/A converter

MC1408-8N digital integrated circuits Integrated Circuit Chip 8- bit multiplying D/A converter

DESCRIPTION

The MC1508/MC1408 series of 8-bit monolithic digital-to-analog converters provide high-speed performance with low cost. They are designed for use where the output current is a linear product of an 8-bit digital word and an analog reference voltage

FEATURES PIN CONFIGURATIONS

• Fast settling time — 70ns (typ)

• Relative accuracy ±0.19% (max error)

• Non-inverting digital inputs are TTL and CMOS compatible

• High-speed multiplying rate 4.0mA/µs (input slew)

• Output voltage swing +0.5V to –5.0V

• Standard supply voltages +5.0V and –5.0V to –15V

• Military qualifications pending

APPLICATIONS

• Tracking A-to-D converters

• 2 1/2-digit panel meters and DVMs

• Waveform synthesis

• Sample-and-Hold

• Peak detector

• Programmable gain and attenuation

• CRT character generation

• Audio digitizing and decoding

• Programmable power supplies

• Analog-digital multiplication

• Digital-digital multiplication

• Analog-digital division

• Digital addition and subtraction

• Speech compression and expansion

• Stepping motor drive modems

• Servo motor and pen drivers

ORDERING INFORMATION

ABSOLUTE MAXIMUM RATINGS

NOTES:

1. Derate above 25°C, at the following rates: F package at 9.5mW/°C; N package at 11.6mW/°C; D package at 8.6mW/°C

BLOCK DIAGRAM

CIRCUIT DESCRIPTION

The MC1508/MC1408 consists of a reference current amplifier, an R-2R ladder, and 8 high-speed current switches. For many applications, only a reference resistor and reference voltage need be added.

The switches are non-inverting in operation; therefore, a high state on the input turns on the specified output current component.

The switch uses current steering for high speed, and a termination amplifier consisting of an active load gain stage with unity gain feedback. The termination amplifier holds the parasitic capacitance of the ladder at a constant voltage during switching, and provides a low impedance termination of equal voltage for all legs of the ladder.

The R-2R ladder divides the reference amplifier current into binarily-related components, which are fed to the remainder current which is equal to the least significant bit. This current is shunted to ground, and the maximum output current is 255/256 of the reference amplifier current, or 1.992mA for a 2.0mA reference amplifier current if the NPN current source pair is perfectly matched.

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