MC1494

6

MOTOROLA ANALOG IC DEVICE DATA

Figure 17. Internal Schematic

(Recommended External Circuitry is Depicted within Dotted Lines)

Block Diagram

15

+V

2 + 4.3 V

+ VR

3

4

–VR

– 4.3 V

1

R1

Current and Voltage

Regulator

9

6

VY

+

–

+

–

Four Quadrant

Multiplier

IA

IB

10

13

VX

78

11

12

Differential

Current

Converter

14

IO

(IO = IA – IB)

5

–V

15

+V

I1 Constant

Current

Source

Control

+ 9.4 V

8.7 k

8.7 k

7.2 k

7.2 k

– 9.4 V

I1

3I1

4

– 4.3 V

2

3

+ 4.3 V

+ 8.7 V

R1

I1

I1

2.4 V

Simplified Circuit

Schematic

2 I1

1.7 V 2 I1

14

IO

IA

IB

9

6

VY

78

RY I

1

I1

I1

RX I

1

13

10

VX

500

500

–V

5

15

+V

500

500

5.4 k

500

3.0 k

7.2 k

8.7 k

8.7 k

7.2 k

7.2 k

2

+ VR

1

3

R1

GND

+VR

4

5

–V

Complete Circuit

Schematic

9

VY

6

10 k

7

8

RY

10 k

10 k

10 k

10

+

13

VX

12

11

RX

500

500

Regulator

Multiplier

Differential

Current Converter

IO

14

500

500

500

500

2.0 k

2.0 k

10 pF

10 pF

500

500

500

500

500

500

500

500

500

11

12

RY

RX

+ VR

–VR

This device contains 44 active transistors.