Philips Semiconductors Linear Products

Product specification

AM6012

12-Bit multiplying D/A converter

August 31, 1994

784

APPLICATION CIRCUITS

Figure 4. AM6012 Logic Inputs

CODE FORMAT

CONNECTIONS

OUTPUT SCALE

MSB

LSB

B1

B2

B3

B4

B5

B6

B7

B8

B9

B10 B11 B12

IO

(mA)

IO

(mA)

VOUT

Unipolar

Symmetrical

Offset

Offset with

True Zero

Straight binary; one

polarity with true input

code, true zero output.

Complementary binary;

one polarity with

complementary input

code, true zero output.

Straight offset binary;

offset half-scale,

symmetrical about zero,

no true zero output.

1’s complement; offset

half-scale, symmetrical

about zero, no true zero

output, MSB complemented

(need inverter at B1).

Offset binary; offset half-

scale, true zero output.

2’s complement; offset

half-scale, true zero

output, MSB complemented

(need inverter at B1).

a – c

b – g

R1 = R2 = 2.5k

a – g

b – c

R1 = R2 = 2.5k

a – c

b – d

f – g

R1 = R3 = 2.5k

a – c

b – d

f – g

R1 = R3 = 2.5k

R2 = 1.25k

e – a – c

b – g

e – a – c

b – g

R1 = R2 = 5k

R1 = R2 = 5k

R2 = 1.25k

Positive full-scale

Positive full-scale – LSB

Zero-scale

Positive full-scale

Positive full-scale – LSB

Zero-scale

Positive full-scale

Positive full-scale – LSB

(+) Zero-scale

(–) Zero-scale

Positive full-scale

Positive full-scale – LSB

(+) Zero-scale

(–) Zero-scale

Negative full-scale – LSB

Positive full-scale

Positive full-scale – LSB

+ LSB

Negative full-scale – LSB

Negative full-scale

Negative full-scale

R

14 +

V

REF

1.0mA

R

OFF +

V

REF

2.0mA

Zero-scale

– LSB

Negative full-scale + LSB

Negative full-scale

Positive full-scale

Positive full-scale – LSB

+ 1 LSB

Zero-scale

– 1 LSB

Negative full-scale + LSB

Negative full-scale

1

1

1

1

1

1

1

1

1

1

1

1

3.999

0.000

9.9976

1

1

1

1

1

1

1

1

1

1

1

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

1

1

1

1

1

1

1

1

1

1

1

1

1

3.998

0.001

9.9951

0.000

3.999

0.0000

0.000

3.999

9.9976

0.001

3.998

9.9951

3.999

0.000

0.0000

1

1

1

1

1

1

1

1

1

1

1

1

3.999

0.000

9.9976

1

1

1

1

1

1

1

1

1

1

1

0

3.998

0.001

9.9927

1

0

0

0

0

0

0

0

0

0

0

0

2.000

1.999

0.0024

0

1

1

1

1

1

1

1

1

1

1

1

1.999

2.000

–0.0024

0

0

0

0

0

0

0

0

0

0

0

1

0.001

3.998

–9.9927

0

0

0

0

0

0

0

0

0

0

0

0

0.000

3.999

–9.9976

0

1

1

1

1

1

1

1

1

1

1

1

3.999

0.000

9.9976

0

1

1

1

1

1

1

1

1

1

1

0

3.998

0.001

9.9927

0

0

0

0

0

0

0

0

0

0

0

0

2.000

1.999

0.0024

1

1

1

1

1

1

1

1

1

1

1

1

1.999

2.000

–0.0024

1

0

0

0

0

0

0

0

0

0

0

1

0.001

3.998

–9.9927

1

0

0

0

0

0

0

0

0

0

0

0

0.000

3.999

–9.9976

1

1

1

1

1

1

1

1

1

1

1

1

3.999

0.000

9.9951

1

1

1

1

1

1

1

1

1

1

1

0

3.998

0.001

9.9902

1

0

0

0

0

0

0

0

0

0

0

1

2.001

1.998

0.0049

1

0

0

0

0

0

0

0

0

0

0

0

2.000

1.999

0.000

0

1

1

1

1

1

1

1

1

1

1

1

1.999

2.000

–0.0049

0

0

0

0

0

0

0

0

0

0

0

1

0.001

3.998

–9.9951

0

0

0

0

0

0

0

0

0

0

0

0

0.000

3.999

–10.000

0

1

1

1

1

1

1

1

1

1

1

1

0

1

1

1

1

1

1

1

1

1

1

0

3.998

0.001

9.9902

0

0

0

0

0

0

0

0

0

0

0

1

2.001

1.998

0.0049

0

0

0

0

0

0

0

0

0

0

0

0

2.000

1.999

0.000

1

1

1

1

1

1

1

1

1

1

1

1

1.999

2.000

–0.049

1

0

0

0

0

0

0

0

0

0

0

1

0.001

3.998

–9.9951

1

0

0

0

0

0

0

0

0

0

0

0

0.000

3.999

–10.000

AM6012

VREF(+)

VREF(–)

+10V

REF

OPTIONAL

(SEE CODE TABLE)

MSB

LSB

ROFF

5,000k

Ω

2.000mA

a

b

B12

B1

IO

IO

e

VOUT

R1

R3

R14

10k

Ω

R15

10k

Ω

f

R2

c

d

g

NE535

–

+

ADDITIONAL CODE MODIFICATIONS

1. Any of the offset binary codes may be complemented by

reversing the output terminal pair.