ad1315kz Analog Devices, Inc., ad1315kz Datasheet - Page 4

• Manufacturer Part Number: ad1315kz
• Description: High Speed Active Load With Inhibit Mode
• Manufacturer: Analog Devices, Inc.

AD1315
DEFINITION OF TERMS
Gain
The measured transconductance.
where:
Gain Error
The difference between the measured transconductance and the
ideal expressed as a % of full-scale range.
Offset Error
Offset Error is measured by setting the I
inputs to 0.2 V and measuring I
Figure 3. I
Temperature
V
PROG
Gain
Gain Error
values are measured at I
OL
, I
OH
I
Figure 1. Definition of Terms
OUT
Offset Current vs.
V
(@ 5V Input ) I
Ideal Gain = 10 mA/V
PROG
Ideal Gain
(@ 5V ) V
Ideal Gain
OUT
OL
. Since both I
Actual Gain
OUT
PROG
/I
OH
OHPROG
(@ 0.2V Input )
(@ 0.2V )
PROG
or I
OH
100
Figure 4. I
Temperature
OLPROG
and I
OL
OL
, I
–4–
OH
Gain Error vs.
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.
Linearity Error
The deviation of the transfer function from a straight line de-
fined by Offset and Gain expressed as a % of FSR.
where:
Offset Error = I
set point = V
Figure 2. Timing Diagram for Inhibit Transition
Linearity Error
I
OUT
I
OUT
(calc) = Gain
(FSR) = Gain
PROG
OUT
(from 0.2 V to 5 V)
(@ 0.2 V) – Gain
I
OUT
Figure 5. I
Current Program Voltage
(measured ) I
V
PROG
I
V
OUT
PROG
(@ set point) + Offset
(FSR )
OL
(@ 5 V) + Offset
, I
OUT
OH
V
PROG
Linearity Error vs.
(calc)
(@ 0.2 V)
100
REV. A