AD1315 Просмотр технического описания (PDF) - HANAMICRON

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AD1315

High Speed Active Load with Inhibit Mode

HANAMICRON 

AD1315

DEFINITION OF TERMS

Gain

The measured transconductance.

Gain = IOUT (@ 5V Input ) − IOUT (@ 0.2V Input )

V PROG(@ 5V ) − V PROG(@ 0.2V )

where:

VPROG values are measured at IOL/IOH PROG

Gain Error

The difference between the measured transconductance and the

ideal expressed as a % of full-scale range.

Ideal Gain = 10 mA/V

Gain Error = Ideal Gain − Actual Gain × 100

Ideal Gain

Offset Error

Offset Error is measured by setting the IOHPROG or IOLPROG

inputs to 0.2 V and measuring IOUT. Since both IOH and IOL

outputs are unipolar, this small initial offset of 2 mA must be set

to allow for measurement of possible negative offset. With a gain

of 10 mA/V, a 0.2 V input should yield an output of ± 2 mA. The

difference between the observed output and the ideal ± 2 mA

output is the offset error.

Offset Error = IOUT (@ 0.2 V) – Gain ϫ VPROG (@ 0.2 V)

Linearity Error

The deviation of the transfer function from a straight line de-

fined by Offset and Gain expressed as a % of FSR.

IOUT (calc) = Gain ϫ VPROG (@ set point) + Offset

where:

set point = VPROG (from 0.2 V to 5 V)

IOUT (FSR) = Gain ϫ VPROG (@ 5 V) + Offset

Linearity Error IOUT (measured ) − IOUT (calc) × 100

IOUT ( FSR )

Figure 1. Definition of Terms

Figure 2. Timing Diagram for Inhibit Transition

Figure 3. IOL, IOH Offset Current vs.

Temperature

Figure 4. IOL, IOH Gain Error vs.

Temperature

Figure 5. IOL, IOH Linearity Error vs.

Current Program Voltage

–4–

REV. A

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