lm94023bitmx National Semiconductor Corporation, lm94023bitmx Datasheet - Page 12

• Manufacturer Part Number: lm94023bitmx
• Description: 1.5v, Micro Smd, Dual-gain Analog Temperature Sensor With Class Ab Output
• Manufacturer: National Semiconductor Corporation

www.national.com
6.0 Selectable Gain for Optimization
and In Situ Testing
The Gain Select digital inputs can be tied to the rails or can
be driven from digital outputs such as microcontroller GPIO
pins. In low-supply voltage applications, the ability to reduce
the gain to -5.5 mV/°C allows the LM94023 to operate over
the full -50 °C to 150 °C range. When a larger supply voltage
is present, the gain can be increased as high as -8.2 mV/°C.
The larger gain is optimal for reducing the effects of noise (for
12
example, noise coupling on the output line or quantization
noise induced by an analog-to-digital converter which may be
sampling the LM94023 output).
Another application advantage of the digitally selectable gain
is the ability to perform dynamic testing of the LM94023 while
it is running in a system. By toggling the logic levels of the
gain select pin and monitoring the resultant change in the
output voltage level, the host system can verify the function-
ality of the LM94023.