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Z

O

+

R1 R3

(R1)R2)

R1

(R2 )R3 ) * R1 (R2)R3)

(4)

DAC8811

U1

OPA277

U2

GND

150 kW

R14

15 kW

R24

C1 10 pF

OPA277

U2

15 kW

R2

50 kW

R34

50 W

R3

150 kW

R1

LOAD

−

+

+

−

Cross-Reference

DAC8811

SLAS411A – NOVEMBER 2004 – REVISED DECEMBER 2004

The value of R3 in the previous equation can be reduced to increase the output current drive of U3. U3 can drive

±20 mA in both directions with voltage compliance limited up to 15 V by the U3 voltage supply. Elimination of the

circuit compensation capacitor C1 in the circuit is not suggested as a result of the change in the output

impedance Z

being a potential cause of oscillation. Therefore, by incorporating C1 into the circuit, possible oscillation problems

are eliminated. The value of C1 can be determined for critical applications; for most applications, however, a

value of several pF is suggested.

Figure 23. Programmable Bidirectional Current Source Circuit

The DAC8811 has an industry-standard pinout. Table 4 provides the cross-reference information.

Table 4. Cross-Reference

SPECIFIED

TEMPERATURE

PACKAGE

PACKAGE

CROSS-

PRODUCT

INL (LSB)

DNL (LSB)

RANGE

DESCRIPTION

OPTION

REFERENCE PART

DAC8811ICDGK

±1

±1

-40

°C to +85°C

8-Lead MicroSOIC

MSOP-8

N/A

DAC8811IBDGK

±2

±1

-40

°C to +85°C

8-Lead MicroSOIC

MSOP-8

AD5543BRM

DAC8811ICDRB

±1

±1

-40

°C to +85°C

8-Lead Small Outline

SON-8

N/A

DAC8811IBDRD

±2

±1

-40

°C to +85°C

8-Lead Small Outline

SON-8

N/A

N/A

±2

±1

-40

°C to +85°C

8-Lead SOIC

SOIC-8

AD5543BR

11