TC7126/A

DS21458B-page 6

© 2002 Microchip Technology Inc.

LCD Drive

LCD Segment Drive Voltage

4

5

6

V+ to V- = 9V

LCD Backplane Drive Voltage

4

5

6

V+ to V- = 9V

Power Supply

Power Supply Current

—

55

100

TC7126/A ELECTRICAL SPECIFICATIONS (CONTINUED)

Symbol

Parameter

Min

Typ

Max

Unit

Test Conditions

Note

1:

Input voltages may exceed the supply voltages, provided the input current is limited to ±100

µA.

2:

Dissipation rating assumes device is mounted with all leads soldered to printed circuit board.

3:

Refer to “Differential Input” discussion.

4:

Backplane drive is in phase with segment drive for “OFF” segment, 180° out of phase for “ON” segment. Frequency is

20 times conversion rate. Average DC component is less than 50mV.

5:

See “Typical Application”.

6:

During Auto-Zero phase, current is 10-20

µA higher. A 48kHz ocillator increases current by 8µA (Typical). Common

current is not included.