© 2002 Microchip Technology Inc.

DS21459B-page 3

TC7129

1.0

ELECTRICAL

CHARACTERISTICS

Absolute Maximum Ratings*

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

Reference Voltage (REF HI or REF LO) ......... V+ to V-

Input Voltage (IN HI or IN LO) (Note 1)........... V+ to V-

Digital Input (Pins 1, 2, 19, 20,

21, 22, 27, 37, 39, 40) .......................... DGND to V+

Analog Input (Pins 25, 29, 30) ........................ V+ to V-

Plastic DIP ..................................................... 1.23W

PLCC ............................................................. 1.23W

Plastic QFP .................................................... 1.00W

Operating Temperature Range ............... 0°C to +70°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.

TC7129 ELECTRICAL SPECIFICATIONS

Pinnumbers refer to40-pinDIP.

Symbol

Parameter

Min

Typ

Max

Unit

Test Conditions

Input

Zero Input Reading

-0000

0000

+0000

Counts

Zero Reading Drift

—

±0.5

—

µV/°C

Ratiometric Reading

9997

9999

10000

Counts

Range Change Accuracy

0.9999

1.0000

1.0001

Ratio

RE

Rollover Error

—

1

2

Counts

NL

Linearity Error

—

1

—

Counts

200mV Scale

CMRR

Common Mode Rejection Ratio

—

110

—

dB

CMVR

Common Mode Voltage Range

—

(V-) + 1.5

—

V

—

(V+) – 1

—

V

200mV Scale

Noise (Peak-to-Peak Value not

Exceeded 95% of Time)

—14

—

µV

P-P

200mV Scale

Input Leakage Current

—

1

10

pA

Scale Factor Temperature Coefficient

—

2

7

ppm/°C

Power

Common Voltage

2.8

3.2

3.5

V

V+ to Pin 28

Common Sink Current

—

0.6

—

mA

∆Common = +0.1V

Common Source Current

—

10

—

µA

∆Common = -0.1V

DGND

Digital Ground Voltage

4.5

5.3

5.8

V

V+ to Pin 36, V+ to V- = 9V

Sink Current

—

1.2

—

mA

∆DGND = +0.5V

Supply Voltage Range

6

9

12

V

V+ to V-

Supply Current Excluding Common

Current

—0.8

1.3

mA

V+ to V- = 9V

Note

1:

Input voltages may exceed supply voltages, provided input current is limited to ±400

µA. Currents above this value may

result in invalid display readings, but will not destroy the device if limited to ±1mA. Dissipation ratings assume device is

mounted with all leads soldered to printed circuit board.