HS7512 datasheet(5/6 Pages) SIPEX

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SIGNAL PROCESSING EXCELLENCE

117

Figure 2. Bipolar Operation

TRANSFER FUNCTION (N=12)

BINARY INPUT UNIPOLAR OUTPUT BIPOLAR OUTPUT

111...111

–V

REF (1 – 2

–N

)–V

REF (1 – 2

–(N – 1)

)

100...001

–V

REF (1/2 + 2

–N

)–V

REF (2

–(N – 1)

)

100...000

–V

REF /2

011...111

–V

REF (1/2 – 2

–N

REF (2

–(N – 1)

)

000...000

REF

VREF

VDD2

400

Ω

VDD1

+15V

DIGITAL

INPUTS

FB1

I O1

I O2

FB 4

FB 3

VSS1

VSS

ROS1

VOUT

HBE

MBE

LBE

LDAC

SP7512

ROS2

V OUT1

A1, A2, LF411ACN

Ω

LDTR

Ω

N.C.

-15V

+15V

20K

Ω

ADJUSTMENT

RANGE 0.2%

a 28–pin SOIC. The HS3120 is available in

commercial and military temperature ranges,

packaged in a 28–pin side–brazed DIP. For

product processed and screened to the require-

ments of MIL–M–38510 and MIL–STD–883C,

please consult the factory (HS3120B only).

Table 1. Transfer Function

APPLICATIONS INFORMATION

Unipolar Operation

Figure 1 shows the interconnections for unipo-

lar operation. Connect I

O1 and FB1 as shown in

diagram. Tie I

O2 (Pin 7), FB3 (Pin 3), and FB4

(Pin 1) to Ground (Pin 8). To maintain specified

linearity, external amplifiers must be zeroed.

This is best done with V

REF set to zero and, with

the DAC register loaded with all bits at zero,

adjust R

OS for VOUT = 0V

Bipolar Operation

Figure 2 shows the interconnections for bipolar

operation. Connect I

O1, IO2, FB1, FB3, FB4 as

shown in diagram. Tie LDTR to I

O2. To main-

tain specified linearity, external amplifiers must

be zeroed. This is best done with V

REF set to zero

and, the DAC register loaded with 10...0 (MSB

= 1), set R

OS2 for VOUT1 = 0V. Then set ROS1 for

OUT = 0V.

Grounding

Connect all GND pins to system analog ground

and tie this to digital ground. All unused input

pins must be grounded.

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