TL7726

HEX CLAMPING CIRCUITS

SLAS078C – SEPTEMBER 1993 – REVISED JULY 1999

4

POST OFFICE BOX 655303

APPLICATION INFORMATION

Device to Be

Protected, e.g.,

A/D Converter,

Microprocessor, etc.

VCC = 5 V

10 k

Ω

II

VI

IZ

Vref

1/6

TL7726

VI(system)

(input signal)

II(system)

Example: If II >> II(system), i.e., VI(system) > Vref + 200 mV

where:

II(system) = Input current to the device being protected

VI(system) = Input voltage to the device being protected

then the maximum input voltage

VI(system)max = Vref + IImax(10kΩ)

= 5 V + 25 mA(10k

Ω)

= 5 V + 250 V

= 255 V

Figure 3. Typical Application