MAX1365 Datasheet, PDF (18/25 Pages) Maxim Integrated Products – Stand-Alone, 4.5-/3.5-Digit Panel Meters with 4-20mA Output

Stand-Alone, 4.5-/3.5-Digit Panel Meters
with 4–20mA Output
UNIPOLAR :
BIPLOLAR :
1. 25
CURRENT
OFFSET
DISABLED
(EN_I = 0)
16
UNIPOLAR :
BIPLOLAR :
8
0
- FS
0
+ FS
ADC OUTPUT CODE
FS = FULL SCALE
Figure 11. DAC Output Voltage vs. ADC Output Code
CURRENT
OFFSET
ENABLED
(EN_I = 1)
20
16
12
UNIPOLAR :
BIPLOLAR :
0
- FS
0
+ FS
ADC OUTPUT CODE
FS = FULL SCALE
Figure 13. Output Current (4-20OUT) vs. ADC Output Code
(Current Offset Disabled)
OFFSET ENABLED :
OFFSET DISABLED :
20
16
4
0
- FS
0
+ FS
ADC OUTPUT CODE
FS = FULL SCALE
Figure 12. Output Current (4-20OUT) vs. ADC Output Code
(Current Offset Enabled)
The transfer function for the MAX1367 with AIN+ - AIN-
< 0 and RANGE = GND is:
(4)
COUNT
=
1.024


V_AIN+
V_REF+
−
−
V_AIN−
V_REF−

x 2000_ +1
The transfer function for the MAX1365 with AIN+ - AIN-
≥ 0 and RANGE = DV_DD is:
4
0
0
1. 25
V/I CONVERTER INPUT ( V )
Figure 14. 4-20OUT Output Current vs. V/I Converter Input
Voltage
(5)
COUNT
=
1.024


V_AIN+
V_REF+
−
−
V_AIN−
V_REF−

x 20,000_
x10
The transfer function for the MAX1365 with AIN+ - AIN-
< 0 and RANGE = DV_DD is:
(6)
COUNT
=
1.024


V_AIN+
V_REF+
−
−
V_AIN−
V_REF−

x 20,000_ x 10 +1
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