Philips Semiconductors

Product data

MC1408-8

8-bit multiplying D/A converter

2001 Aug 03

7

5

6

7

8

9

10

11

12

3

MC1408

13

14

15

1

2

4

16

51

CO ≤ 25pF

R14

0.1

µF

RL

eIN

VEE

VCC

15pF

0.1

µF

1.0k

1.0k

0.1

µF

eO

FOR SETTLING TIME

MEASUREMENT

(ALL BITS

SWITCHED LOW

TO HIGH)

2.4V

0.4V

1.0V

SETTLING TIME

0

0

TRANSIENT

RESPONSE

–100

mV

FOR TURN OFF

MEASUREMENT

USE RL to GND

1.4V

RL = 50Ω

PIN 4 TO GND

tS = 70ns TYPICAL

TO

±1/2LSB

tPLH

tPHL

tPHL = tPLH = 10ns

RL = 500Ω

eIN

+2VDC

SL00054

Figure 7. Transient Response and Settling Time

INPUTS

5

6

7

8

9

10

11

12

3

MC1408

13

14

15

1

2

4

16

VEE

VCC

THE RESISTOR TIED TO PIN 15 IS TO TEMPERATURE COMPENSATE THE

BIAS CURRENT AND MAY NOT BE NECESSARY FOR ALL APPLICATIONS

VI AND II APPLY TO INPUTS A1 THROUGH A8

I

O +

K

A

1

2

)

A

2

4

)

A

3

8

)

A

4

16 )

A

5

32 )

A

6

64 )

A

7

128 )

A

8

256

where K

+

V

REF

R

14

and AN = “1” IF AN IS AT HIGH LEVEL

AN = “0” IF AN IS AT LOW LEVEL

DIGITAL

IEE

IO

I15

I14

R14

R15

VO

OUTPUT

RL

VI

II

(+)

ICC

VREF(+)

(SEE TEXT FOR VALUES OF C.)

TYPICAL VALUES R14 = R15 = 1k

VREF = +2.0V

C = 15pF

A1

A2

A3

A4

A5

A6

A7

A8

SL00055

Figure 8. Notation Definitions

2.0mA

5

6

7

8

9

10

11

12

3

13

14

15

1

2

4

16

VCC

SCOPE

RL = 50

VREF

MC1408

VEE

15pF

1k

1k

SLEWING TIME

10%

90%

0

dI

dt

+

I

R

L

dV

dt

SL00056

Figure 9. Reference Current Slew Rate Measurement