MAX1478 Datasheet, PDF (3/20 Pages) Maxim Integrated Products – 1% Accurate, Digitally Trimmed,Rail-to-Rail Sensor Signal Conditioner

1% Accurate, Digitally Trimmed,
Rail-to-Rail Sensor Signal Conditioner
ELECTRICAL CHARACTERISTICS (continued)
(V_DD = +5V, V_SS = 0, T_A = +25°C, unless otherwise noted.)
PARAMETER
CURRENT SOURCE
Bridge Current Range
Bridge Voltage Swing
Reference Input Voltage Range
(ISRC)
SYMBOL
I_BDRIVE
V_BDRIVE
V_ISRC
CONDITIONS
DIGITAL-TO-ANALOG CONVERTERS
DAC Resolution
Differential Nonlinearity
DNL
Offset DAC Bit Weight
∆V_OUT
∆Code
DAC reference = V_DD = 5.0V
Offset TC DAC Bit Weight
∆V_OUT
∆Code
DAC reference = V_BDRIVE = 2.5V
FSO DAC Bit Weight
∆V_ISRC
∆Code
DAC reference = V_DD = 5.0V
FSO TC DAC Bit Weight
∆V_FSOTC
∆Code
DAC reference = V_BDRIVE = 2.5V
IRO DAC
DAC Resolution
DAC Bit Weight
FSOTC BUFFER
Output Voltage Swing
Current Drive
INTERNAL RESISTORS
Current-Source Reference
Resistor
FSO Trim Resistor
Temperature-Dependent
Resistor
Input referred, V_DD = 5V (Note 6)
No load
V_FSOTC = 2.5V
R_ISRC
R_FTC
R_TEMP
Typically 4600ppm/°C tempco
MIN
TYP MAX UNITS
0.1
0.5
2.0
mA
V_SS + 1.3
V_DD - 1.3
V
V_SS + 1.3
V_DD - 1.3
V
±1.5
2.8
1.4
1.22
0.6
12
Bits
LSB
mV/bit
mV/bit
mV/bit
mV/bit
3
Bits
9
mV/bit
V_SS + 0.3
-20
V_DD - 1.3
V
20
µA
75
kΩ
75
kΩ
100
kΩ
Note 1: Excludes the sensor or load current.
Note 2: All electronics temperature errors are compensated together with sensor errors.
Note 3: The sensor and the MAX1478 must always be at the same temperature during calibration and use.
Note 4: This is the maximum allowable sensor offset.
Note 5: This is the sensor’s sensitivity normalized to its drive voltage, assuming a desired full-span output of 4V and a bridge
voltage of 2.5V.
Note 6: Bit weight is ratiometric to V_DD.
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