TC7129 datasheet(2/15 Pages) TELCOM

2 / 15 page

3-232

TELCOM SEMICONDUCTOR, INC.

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

Notes: 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.

*Static-sensitive device. Unused devices must be stored in conductive

material. Protect devices from static discharge and static fields. Stresses

above those listed under Absolute Maximum Ratings may cause perma-

nent 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 operational sections of the specifications is not implied.

Exposure to Absolute Maximum Rating Conditions for extended periods

may affect device reliability.

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

Test Conditions

Min

Typ

Max

Unit

Input

Zero Input Reading

VIN = 0V, 200 mV Scale

– 0000

0000

+0000 Counts

Zero Reading Drift

VIN = 0V, 0°C < TA < +70°C—

±0.5

—

µV/°C

Ratiometric Reading

VIN = VREF = 1000 mV, Range = 2V

9997

9999

10000 Counts

Range Change Accuracy

VIN = 0.1V on Low Range

0.9999 1.0000

1.0001 Ratio

VIN = 1V on High Range

Roll-Over Error

–VIN = +VIN = 199 mV

—

Counts

Linearity Error

200 mV Scale

—

Counts

CMRR

Common-Mode Rejection Ratio

VCM = 1V, VIN = 0V, 200 mV Scale

—

110

—

CMVR

Common-Mode Voltage Range

VIN = 0V

—

(V–) +1.5

—

200 mV Scale

—

(V+) –1

—

Noise (Peak-to-Peak Value Not

VIN = 0V

—

µVP-P

Exceeded 95% of Time)

200 mV Scale

IIN

Input Leakage Current

VIN = 0V, Pins 32, 33

—

Scale Factor Temperature

VIN = 199 mV, 0°C < TA < +70°C

—

ppm/

°C

Coefficient

External VREF = 0 ppm/°C

Power

VCOM

Common Voltage

V+ to Pin 28

2.8

3.2

3.5

Common Sink Current

∆Common = +0.1V

—

0.6

—

Common Source Current

∆Common = –0.1V

—

µA

DGND

Digital Ground Voltage

V+ to Pin 36, V+ to V– = 9V

4.5

5.3

5.8

Sink Current

∆DGND = +0.5V

—

1.2

—

Supply Voltage Range

V+ to V–

Supply Current Excluding Common Current

V+ to V– = 9V

—

0.8

1.3

fCLK

Clock Frequency

—

120

360

kHz

VDISP Resistance

VDISP to V+

—50

—

Ω

Low-Battery Flag Activation Voltage

V+ to V–

6.3

7.2

7.7

Digital

Continuity Comparator

VOUT Pin 27 = High

100

200

—

Threshold Voltages

VOUT Pin 27 = Low

—

200

400

Pull-Down Current

Pins 37, 38, 39

—

µA

Storage Temperature Range ................ – 65

°C to +150°C

Lead Temperature (Soldering, 10 sec) ................. +300

°C

TC7129

4-1/2 DIGIT ANALOG-TO-DIGITAL

CONVERTER WITH ON-CHIP LCD DRIVERS

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