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TC7126CKW

3-1/2 Digit Analog-to-Digital Converters

Microchip Technology 

TC7126/A

TABLE 1-1: TC7126/A ELECTRICAL SPECIFICATIONS (CONTINUED)

Electrical Characteristics: VS = +9V, fCLK – 16kHz, and TA = +25°C, unless otherwise noted.

Symbol

Parameter

Min

Typ

Max

Unit

Test Conditions

VC

Analog Common Voltage

LCD Drive

2.7

3.05

3.35

V

250kΩ Between Common and V+

VSD LCD Segment Drive Voltage

VBD LCD Backplane Drive Voltage

Power Supply

4

5

6

VP-P

V+ to V- = 9V

4

5

6

VP-P

V+ to V- = 9V

IS Power Supply Current

—

55

100

μA

VIN = 0V, V+ to V- = 9V (Note 6)

Note 1: Input voltages may exceed the supply voltages, provided the input current is limited to ±100μA.

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 10-20μA higher. A 48kHz ocillator increases current by 8μA (Typical). Common

current is not included.

DS21458C-page 6

© 2006 Microchip Technology Inc.

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