4 | Product Specifications |
| |
|
|
|
|
|
| Overvoltage protectioni | TC Modeii |
|
|
| • Common mode: ±17 V (TC+ and TC– with |
|
|
| respect to GND) |
|
|
| • Differential mode: ±7 V (Differential voltage |
|
|
| between TC+ and |
|
|
| Bypass mode |
|
|
| • ±20 V (TC+ input with respect to GND) |
|
|
| Power Off Mode |
|
|
| • ±11 V (TC+, TC– input with respect to GND) |
|
|
|
|
|
| Input impedance | > 1 GΩ |
|
|
|
|
|
| Input bias current | ±2.5 nA max |
|
|
|
|
|
| Input offset current | ±1.5 nA max |
|
|
|
|
|
| Gain drift | 60 ppm / °C max |
|
|
|
|
|
| Offset drift | 1 µV / °C max |
|
|
|
|
|
| Filter cutoff frequency | 4.0 Hz |
|
| mode) | |
|
|
| |
|
|
|
|
|
| Filter type (thermocouple mode) | Low Pass RC Filter |
|
|
|
|
|
|
|
|
|
| OTHER FEATURES |
|
|
|
|
|
Recommended warm up time
30 minutes
iThe overvoltage protection levels specified above indicate the maximum voltage each input pin can tolerate without resulting in any damages. However, prolonged exposure to these levels may affect device safety and reliability. Hence, it should be avoided where possible.
iiOn the channels configured for thermocouple mode, the TC+ and TC– pins can tolerate up to ±17 V of differential voltage for a few minutes. However, exceeding ±100 mV voltage range on these channels can cause additional current to be drawn from the device’s power supply regulators, which may damage the device if multiple channels are overdriven for prolonged periods. This
applies to the case where a voltage source is tied across the TCn+ and TCn– pin. Voltage sources greater than ±100 mV should be tied to TCn+ and GND (floating source), or TCn+ and TCn+1+ (grounded source), and have the channels set for bypass mode. Refer to Figure
50 | Agilent U2802A |
