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TC7129IPL

4-1/2 Digit Analog-to-Digital Converters with On-Chip LCD Drivers

Microchip Technology 

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–

VDISP .......................................... V+ to (DGND – 0.3V)

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–

Package Power Dissipation (TA ≤ 70°C)

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

TC7129

*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

Electrical Characteristics: V+ to V– = 9V, VREF = 1V, TA = +25°C, fCLK = 120 kHz, unless otherwise indicated.

Pin numbers refer to 40-pin DIP.

Symbol

Parameter

Min

Typ Max Unit

Test Conditions

Input

Zero Input Reading

Zero Reading Drift

Ratiometric Reading

–0000

—

9996

0000

±0.5

—

+0000

—

10000

Counts

μV/°C

Counts

VIN = 0V, 200 mV scale

VIN = 0V, 0°C < TA < +70°C

VIN = VREF = 1000 mV,

Range = 2V

Range Change Accuracy

RE

Rollover Error

NL

Linearity Error

0.9999

—

—

1.0000

1

1

1.0001

2

—

Ratio

Counts

Counts

VIN = 1V on High Range,

VIN = 0.1V on Low Range

VIN– = VIN+ = 199 mV

200mV Scale

CMRR Common Mode Rejection Ratio

—

110

—

dB VCM = 1V, VIN = 0V,

200 mV scale

CMVR Common Mode Voltage Range

—

(V-) + —

1.5

V VIN = 0V

— (V+) – 1 —

V 200 mV scale

eN

Noise (Peak-to-Peak Value not

—

14

—

μVP-P VIN = 0V

Exceeded 95% of Time)

200 mV scale

IIN

Input Leakage Current

—

1

10

pA VIN = 0V, pins 32, 33

Scale Factor Temperature

Coefficient

—

2

7 ppm/°C VIN = 199 mV,

0°C < TA < +70°C

External VREF = 0 ppm/°C

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 ±1 mA.

Dissipation ratings assume device is mounted with all leads soldered to printed circuit board.

© 2006 Microchip Technology Inc.

DS21459D-page 3

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