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

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Anterwell Technology Ltd.

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

Country/Region	china
City & Province	shenzhen guangdong
Categories	Chargers

Product Details

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
V_CC	Positive power supply voltage	+5.5	V
V_EE	Negative power supply voltage	–16.5	V
V₅ – V₁₂	Digital input voltage	0 to V_CC	V
V_O	Applied output voltage	–5.2 to +18	V
I₁₄	Reference current	5.0	mA
V₁₄, V₁₅	Reference amplifier inputs	V_EE to V_CC
P_D	Maximum power dissipation, TA = 25°C (still-air)¹ F package N package D package	1190 1450 1080	mW mW mW
T_SOLD	Lead soldering temperature (10 sec)	300	°C
T_A	Operating temperature range MC1508 MC1408	300 –55 to +125 0 to +75	°C °C °C
T_STG	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.