Philips MC1508-8F, MC1408-8N, MC1408-8D, MC1408-8F, MC1408-8NB Datasheet

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Philips Semiconductors Linear Products

Product specification

 

 

 

 

8-bit multiplying D/A converter

MC1508-8/1408-8

 

 

 

 

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

Fast settling time Ð 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

PIN CONFIGURATIONS

F, N Packages

 

 

 

 

 

 

 

 

NC

1

 

 

 

16

COMPEN

 

 

 

 

 

 

 

 

GND

2

 

 

 

15

VREF(±)

 

 

 

 

 

 

 

 

VEE

3

 

 

 

14

VREF(+)

 

 

 

 

 

 

 

 

I

4

 

 

 

13

V

 

O

 

 

 

 

 

 

CC

 

 

 

 

 

 

MSB A1

5

 

 

 

12

A8 LSB

 

 

 

 

 

A2

6

 

 

 

11

A7

 

 

 

 

 

A3

7

 

 

 

10

A6

A4

 

 

 

 

 

 

 

8

 

 

 

9

A5

 

 

 

 

 

 

 

 

D Package1

V+

 

 

 

 

 

 

 

1

 

 

 

16

A8

LSB

 

 

 

 

 

 

A7

 

VREF(+)

2

 

 

 

15

 

 

 

 

 

 

 

A6

 

VREF(±)

3

 

 

 

14

 

 

 

 

 

 

 

A5

 

COMPEN

4

 

 

 

13

 

 

 

 

 

 

 

 

 

NC

5

 

 

 

12

A4

 

 

 

 

 

 

 

 

 

GND

6

TOP VIEW

11

A3

 

 

 

 

 

7

10

A2

 

 

 

 

 

 

 

 

 

IO

8

 

 

 

9

A1

MSB

 

 

 

 

 

 

 

 

NOTE:

1. SO and non-standard pinouts.

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

August 31, 1994

737

853-0935 13721

Philips MC1508-8F, MC1408-8N, MC1408-8D, MC1408-8F, MC1408-8NB Datasheet

Philips Semiconductors Linear Products

Product specification

 

 

 

8-bit multiplying D/A converter

MC1508-8/1408-8

 

 

 

BLOCK DIAGRAM

MSB

 

 

 

 

 

 

LSB

A1

A2

A3

A4

A5

A6

A7

A8

5

6

7

8

9

10

11

12

 

 

 

 

 

 

 

IO

 

 

CURRENT SWITCHES

 

 

4

 

R-2R LADDER

 

 

 

BIAS

2

 

 

 

 

CURRENT

 

 

 

 

GND

 

 

 

 

 

 

 

VREF

 

 

 

 

 

 

 

(+)

 

 

 

 

 

 

 

14

 

 

 

 

 

 

13

15

 

 

 

 

REFERENCE

VCC

 

 

 

 

CURRENT

 

(±)

 

 

 

 

AMPLIFIER

 

VREF

 

 

 

 

 

 

16

 

 

 

 

 

 

 

 

 

 

 

 

 

 

COMPEN

 

 

VEE

3

 

 

 

 

 

 

NPN CURRENT SOURCE PAIR

 

 

 

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.

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,

 

 

T

1

 

 

 

= 25°C (still-air)

 

 

 

A

 

 

 

 

 

F package

1190

mW

 

 

N package

1450

mW

 

 

D package

1080

mW

 

 

 

 

TSOLD

Lead soldering temperature (10 sec)

300

°C

TA

Operating temperature range

300

°C

 

 

MC1508

±55 to +125

°C

 

 

MC1408

0 to +75

°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

August 31, 1994

738

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