TC7126/A

DS21458C-page 6

© 2006 Microchip Technology Inc.

Analog Common Voltage

2.7

3.05

3.35

V

250k

Ω Between Common and V+

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

TABLE 1-1:

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.