
MAX1457
0.1%-Accurate Signal Conditioner
for Piezoresistive Sensor Compensation
2
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ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS
(VDD = +5V, VSS = 0V, TA = +25°C, unless otherwise noted.)
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
Supply Voltage, VDD to VSS......................................-0.3V to +6V
All other pins ....................................(VSS - 0.3V) to (VDD + 0.3V)
Continuous Power Dissipation (TA = +70°C)
28-Pin Wide SO (derate 12.50mW/°C above +70°C) ..........1W
32-Pin TQFP (derate 11.1mW/°C above +70°C)...........889mW
Operating Temperature Ranges
MAX1457C_ _ ......................................................0°C to +70°C
MAX1457A_ _ .................................................-40°C to +125°C
Storage Temperature Range .............................-65°C to +150°C
Lead Temperature (soldering, 10sec) .............................+300°C
Reference voltage = 5.000V
RBIAS = 400k, fCLK = 100kHz (Note 1)
Gain = 54, DC to 10Hz, sensor impedance =
5k
, full-span output = 4V
VOUT = (VSS + 0.25V) to (VDD - 0.25V)
(Note 5)
(Note 4)
5k
load to VSS or VDD
From VSS to VDD
fCLK = 100kHz, to 63% of final value
(Notes 2, 3)
CONDITIONS
V
200
DAC Voltage Resolution
V
VSS + 1.3
VDD - 1.3
VISRC
Current-Source Reference Input
Voltage Range
V
VSS + 1.3
VDD - 1.3
VBR
Bridge Voltage Swing
mA
0.1
0.5
2.0
IBR
Bridge Current Range
%FSO
0.0025
Output Noise
mA
-1.0
1.0
(sink)
(source)
Output Current Range
V
VSS + 0.02
VDD - 0.02
Output Voltage Swing
ppm/°C
±50
Differential Signal Gain Tempco
V/V
54 to 306
Differential Signal Gain Range
mA
2.0
2.6
IDD
Supply Current
V
4.5
5
5.5
VDD
Supply Voltage
mV/V
5 to 30
Input-Referred Adjustable
Full-Span Output Range
mV
±100
Input-Referred Adjustable
Offset Range
dB
90
CMRR
Common-Mode Rejection Ratio
ms
1
Output Step-Response Time
M
1
M
1
RIN
Input Impedance
V/°C
±0.5
Input-Referred Offset Tempco
%VDD
0.01
Amplifier Gain Nonlinearity
UNITS
MIN
TYP
MAX
SYMBOL
PARAMETER
Output filter capacitor = 0.1F, fCLK = 100kHz
LSB
2
Differential Nonlinearity
Bits
16
DAC Resolution
VSS + 0.25
VDD - 0.25
TA = TMIN to TMAX
V/V
49
54
60
Minimum Differential Signal Gain
GENERAL CHARACTERISTICS
ANALOG INPUT (PGA)
ANALOG OUTPUT (PGA)
DIGITAL-TO-ANALOG CONVERTERS
CURRENT SOURCE
No load