Stand-Alone, 4.5-/3.5-Digit Panel Meters

with 4–20mA Output

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5

ELECTRICAL CHARACTERISTICS (continued)

PARAMETER

SYMBOL

CONDITIONS

MIN

TYP

MAX

UNITS

DAC OUTPUT ACCURACY

Zero-Scale Error

±50

µA

Zero-Scale Error Tempco

±40

ppmFS/

°C

Gain Error

±0.5

%FS

Gain-Error Tempco

±25

ppmFS/

°C

Span Linearity

±2

±4µA

Power-Supply Rejection

PSR

4

µA/V

Signal Path Noise

10pF to GND on 4-20OUT

2.0

4–20mA Current Limit

Ω

20

mA

Note 1: Integral nonlinearity is the deviation of the analog value at any code from its theoretical value after nulling the gain error and

offset error.

Note 2: Offset calibrated.

Note 3: Offset nulled.

Note 4: Drift error is eliminated by recalibration at the new temperature.

Note 5: The input voltage range for the analog inputs is given with respect to the voltage on the negative input of the differential pair.

Note 8: Measured at DC by changing the power-supply voltage from 2.7V to 5.25V and measuring the effect on the conversion error

with external reference. PSRR at 50Hz and 60Hz exceeds 120dB with filter notches at 50Hz and 60Hz (Figure 1).

Note 9: LED drivers are disabled.