ELECTRICAL CHARACTERISTICS (Cont.)
Boldface limits apply over the specified temperature range, TA = –40°C to +85°C.
At TA = +25°C, VPS = 24V, and Supertex DN2540 external depletion-mode FET transistor, unless otherwise noted, all voltages measured with respect to IRET pin.
XTR108EA
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
OVER- AND UNDER-SCALE LIMITING
Over-Scale DAC: 16 Steps
Adjustment Range
RTO(6) of Current Amplifier
RTO(6) of PGA
4
Bits
RVI = 6.34kΩ
20.7 to 28.1
2.625 to 3.563
mA
V
Step Size
RTO(6) of Current Amplifier
RTO(6) of PGA
Accuracy
Under-Scale DAC: 8 Steps
Adjustment Range
RTO(6) of Current Amplifier
RTO(6) of PGA
0.49
62.5
±10
3
mA
mV
%
Bits
RVI = 6.34kΩ
2.17 to 3.55
275 to 450
mA
mV
Step Size
RTO(6) of Current Amplifier
RTO(6) of PGA
Accuracy
0.195
25
±5
mA
mV
%
VOLTAGE REFERENCE, VREF
Internal Bandgap
1.193
V
vs Temperature
±5
±50
ppm/°C
UNCOMMITTED OP AMP
Input
Offset Voltage
vs Temperature
vs Common-Mode Voltage
Open-Loop Gain
VCM = 2V
±2
±3
90
mV
µV/°C
dB
110
dB
Common-Mode Input Range
Output Voltage Range
0 to 3.5
V
V
RL = 10kΩ to VS/2
0.2
VS – 0.2
DIGITAL INPUT/OUTPUT
Logic Family
Logic Levels
VIL
VIH
VOL
CMOS
0
3.5
0.8
VS
0.4
V
V
V
V
IOL = 300µA
IOH = –300µA
VOH
VS – 1
Input Current
IIH (CS1)
IIL (CS1)
3.5 < VIN < VS
0 < VIN < 0.8
0 < VIN < VS
–200
–20
–20
–120
–6
–6
10
10
10
µA
µA
µA
I
IH, IIL (SCLK, DIO)
INTERNAL OSCILLATOR
Frequency, fOSC
210
kHz
TEMPERATURE RANGE
Specification
Operating
–40
–55
+85
+125
°C
°C
θJA, Junction to Ambient
100
0.5
°C/W
LOOP SUPPLY
Voltage Range
Quiescent Current
with Supertex DN2540
RSET Open, LINReg = 0, No Sensor Current(8)(9)
7.5
V
mA
NOTES: (1) Over-scale and under-scale complies with NAMUR NE43 recommendation. (2) Span adjustment is determined by PGA gain and sensor
excitation. (3) Span can be digitally adjusted in three ways: PGA gain, current reference Coarse, and current reference Fine. (4) RTI = Referred to Input.
(5) Current source output voltage measured with respect to IRET. (6) RTO = Referred to Output. (7) Excitation DAC range sufficient to adjust span fully
between PGA gain steps. (8) Output current into external circuitry is limited by an external MOS power FET. (9) Measured with over- and under-scale limits
disabled.
XTR108
4
SBOS187C
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