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
| DESCRIPTION | TEMPERATURE RANGE | ORDER CODE | DWG # |
| 16-Pin Ceramic Dual In-Line Package (CERDIP) | -55 to +125°C | MC1508-8F | 0582B |
| 16-Pin Ceramic Dual In-Line Package (CERDIP) | 0 to +70°C | MC1408-8F | 0582B |
| 16-Pin Plastic Dual In-Line Package (DIP) | 0 to +70°C | MC1408-8N | 0406C |
| 16-Pin Small Outline (SO) Package | 0 to +70°C | MC1408-8D | 0005D |
ABSOLUTE MAXIMUM RATINGS
| SYMBOL | PARAMETER | RATING | Unit |
| VCC | Positive power supply voltage | +5.5 | V |
| VEE | Negative power supply voltage | –16.5 | V |
| V5 – V12 | Digital input voltage | 0 to VCC | V |
| VO | Applied output voltage | –5.2 to +18 | V |
| I14 | Reference current | 5.0 | mA |
| V14, V15 | Reference amplifier inputs | VEE to VCC | |
| PD | Maximum power dissipation, TA = 25°C (still-air)1 F package N package D package | 1190 1450 1080 | mW mW mW |
| TSOLD | Lead soldering temperature (10 sec) | 300 | °C |
| TA | Operating temperature range MC1508 MC1408 | 300 –55 to +125 0 to +75 | °C °C °C |
| TSTG | Storage temperature range | -65 to +150 | °C |
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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