MAX1457 Maxim, MAX1457 Datasheet - Page 3

• Manufacturer Part Number: MAX1457
• Description: 0.1%-Accurate Signal Conditioner for Piezoresistive Sensor Compensation
• Manufacturer: Maxim

ELECTRICAL CHARACTERISTICS (continued)
(V
Note 1: Circuit of Figure 5 with current source turned off. This value is adjustable through a bias resistor and represents the IC cur-
Note 2: Temperature errors for the entire range are compensated together with the sensor errors.
Note 3: The sensor and the MAX1457 must always be at the same temperature during calibration and use.
Note 4: This is the maximum allowable sensor offset at minimum gain (54V/V).
Note 5: This is the sensor’s sensitivity normalized to its drive voltage, assuming a desired full-span output of 4V and a bridge volt-
ANALOG-TO-DIGITAL CONVERTER
OUTPUTS (LINDAC, FSOTCDAC)
UNCOMMITTED OP AMP
ADC Differential Nonlinearity
Conversion Time
ADC Resolution
Voltage Swing
Current Drive
Offset Voltage
Input Common-Mode
Voltage Range
Open-Loop Gain
Offset Voltage (as unity-gain
follower)
Output Voltage Swing
Output Current Range
DD
= +5V, V
rent consumption. This excludes the 93C66 EEPROM average current, which is approximately 13µA at a refresh rate of 3Hz
(f
age of 2.5V. Lower sensitivities can be accommodated by using the auxiliary op amp. Higher sensitivities can be accommo-
dated by operating at lower bridge voltages.
PARAMETER
CLK
SS
= 100kHz).
= 0V, T
_______________________________________________________________________________________
for Piezoresistive Sensor Compensation
A
= +25°C, unless otherwise noted.)
SYMBOL
V
CMR
A
OFS
0.1%-Accurate Signal Conditioner
V
V
f
R
R
V
(V
R
R
R
5k load to V
No load
V
CLK
BR
OUT
OUT
BIAS
BIAS
BIAS
BIAS
BIAS
IN
= 2.5V to 3.5V, f
- V
= 100kHz
= 2.5V ±20mV
= (V
= 400kΩ (no load)
= 400kΩ, V
= 400kΩ (no load)
= 400kΩ
= 400kΩ, V
OUT
SS
) at V
+ 0.25V) to (V
SS
CONDITIONS
or V
IN
IN
IN
= 2.5V,
= 2.5V,
CLK
DD
= 2.5V (no load)
= 100kHz
DD
- 0.25V)
V
V
V
V
(sink)
SS
SS
SS
SS
MIN
-1.0
-50
-20
-20
+ 1.3
+ 1.3
+ 0.25
+ 0.02
TYP
160
60
2
V
V
V
V
DD
DD
(source)
DD
DD
- 0.25
- 0.02
MAX
1.0
- 1.3
- 1.2
12
50
20
20
UNITS
LSB
Bits
mA
mV
mV
ms
µA
dB
V
V
V
3