tc7126a Microchip Technology Inc., tc7126a Datasheet - Page 6

• Manufacturer Part Number: tc7126a
• Description: 3-1/2 Digit Analog-to-digital Converters
• Manufacturer: Microchip Technology Inc.

TC7126/A
TABLE 1-1:
DS21458C-page 6
Electrical Characteristics: V
V
LCD Drive
Power Supply
Note 1: Input voltages may exceed the supply voltages, provided the input current is limited to ±100μA.
Symbol
C
V
V
I
SD
BD
S
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
5: See “Typical Application”.
6: During Auto-Zero phase, current is 10-20μA higher. A 48kHz ocillator increases current by 8μA (Typical). Common
Analog Common Voltage
LCD Segment Drive Voltage
LCD Backplane Drive Voltage
Power Supply Current
20 times conversion rate. Average DC component is less than 50mV.
current is not included.
TC7126/A ELECTRICAL SPECIFICATIONS (CONTINUED)
Parameter
S
= +9V, f
CLK
– 16kHz, and T
Min
2.7
—
4
4
A
= +25°C, unless otherwise noted.
3.05
Typ
55
5
5
Max
3.35
100
6
6
Unit
V
V
μA
V
P-P
P-P
250kΩ Between Common and V+
V+ to V- = 9V
V+ to V- = 9V
V
© 2006 Microchip Technology Inc.
IN
= 0V, V+ to V- = 9V (Note 6)
Test Conditions