© 2006 Microchip Technology Inc.

DS21458C-page 5

TC7126/A

1.0

ELECTRICAL

CHARACTERISTICS

Absolute Maximum Ratings*

Supply Voltage (V+ to V-) ....................................... 15V

Analog Input Voltage (either Input) (Note 1) ... V+ to V-

Reference Input Voltage (either Input) ............ V+ to V-

Clock Input ................................................... Test to V+

44-Pin PQFP............................................... 1.00W

40-Pin PLCC ............................................... 1.23W

44-Pin PDIP ................................................ 1.23W

Operating Temperature Range:

C (Commercial) Devices .................. 0°C to +70°C

I (Industrial) Devices .................... -25°C to +85°C

Storage Temperature Range .............. -65°C to +150°C

*Stresses

above

those

listed

under

“Absolute

Maximum Ratings” may cause permanent damage to

the device. These are stress ratings only and functional

operation of the device at these or any other conditions

above those indicated in the operation sections of the

specifications is not implied. Exposure to Absolute

Maximum Rating conditions for extended periods may

affect device reliability.

TABLE 1-1:

TC7126/A ELECTRICAL SPECIFICATIONS

Symbol

Parameter

Min

Typ

Max

Unit

Test Conditions

Input

Zero Input Reading

-000.0

±000.0

+000.0

Digital

Reading

Full Scale = 200mV

Zero Reading Drift

—

0.2

1

μV/°C

Ratiometric Reading

999

999/1000

1000

Digital

Reading

NL

Linearity Error

-1

±0.2

1

Count

Full Scale = 200mV or 2V

Max Deviation From Best Fit

Straight Line

Rollover Error

-1

±0.2

1

Count

Noise

—

15

—

Input Leakage Current

—

1

10

pA

CMRR

Common Mode Rejection Ratio

—

50

—

μV/V

Full Scale = 200mV

Scale Factor Temperature

Coefficient

—

1

5

ppm/°C

Ext. Ref. Temp Coeff. = 0ppm/°C

Analog Common

Analog Common Temperature

Coefficient

—

—

—

—

250k

Ω Between Common and V+

——

—

—

0°C

—

80

—

ppm/°C

TC7126

—

35

75

ppm/°C

TC7126A

—

35

100

ppm/°C

-25°C

(TC7126A)

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.