D ouble Buffered 12-Bit MD AC

H S 3120

D ata Converter Line

FEATURES

• M onolithic Construction

• 12-Bit Resolution

• 0.01% Non-Linearity

• jup Compatible

• 4-Quadrant M ultiplication

• Latch-up Protected

DESCRIPTION

The HS 3120 is a precision monolithic 12-bit

multiplying DA C with internal two-stage input

storage registers for easy interfacing with

microprocessor busses. It is packaged in a 28-pin DIP

to give high I/O design flexibility.

DOUBLE BUFFERED —The input registers are sectioned

into 3 segments of 4 bits each, all individually

addressable. The DA C register, following the input

registers, is a parallel 12-bit register for holding the

DA C data while the input registers are updated. Only

the data held in the DA C register determines the

analog output value of the converter.

M ICRO PROCESSOR COM PA TIBLE — The HS 3120 has

been designed for great flexibility in connecting to

bus-oriented systems. The 12 data inputs are

organized into 3 independent addressable 4-bit input

registers such that the HS 3120 can be connected to

either a 4, 8 or 16-bit data bus. The control logic of

the HS 3120 includes chip enable and latch enable

inputs for flexible memory mapping. A ll

controls are level-triggered to allow static or dynamic

operation.

V ERSA TILE OUTPUTS — A total of 5 output lines are

provided by the HS 3120 to allow unipolar and

bipolar output connection with a minimum of

external components. The feedback resistor is

internal. The resistor ladder network termination is

externally available, thus eliminating an external

resistor for the 1 LSB offset in bipolar mode.

M ONOLITHIC CM OS CONSTRUCTION —The HS 3120

is a one-chip CM OS circuit with a resistor ladder

network designed for 0.01% linearity without laser

trimming. Small chip size and high manufacturing

yields result in greatly reduced cost.

FUNCTIONAL DIAGRAM

(M SB)

1

BIT

2

10

9

3

11

4

12

5

13

6

14

7

15

8

16

9

17

10

18

11

19

BIT 12

(LSB)

20

V REF

4

INPUT REGISTER

INPUT REGISTER

INPUT REGISTER

CONTROL

LOGIC

DA C REGISTER

12 BIT M DA C

CE

HBE

M BE

LBE

LDA C

22

25

24

23

21

28

26

27

8

2

V DD1

V DD2

GND

GND

LDTR

R/2

R/2

FB1

I01

I02

FB4

FB3

R

5

6

7

1

3

HS 3120

165Cedar Hill Street,Marlborough,MA01752 Tel:508.485.6350 Fax: 508.485.5168

www.SpectrumMicrowave.com