TC7126 datasheet(2/13 Pages) TELCOM

2 / 13 page

3-218

TELCOM SEMICONDUCTOR, INC.

3-1/2 DIGIT

ANALOG-TO-DIGITAL CONVERTERS

TC7126

TC7126A

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+

Operating Temperature Range

C Devices .............................................. 0

°C to +70°C

I Devices ........................................... – 25

°C to +85°C

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

°C to +150°C

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

°C

Power Dissipation, (TA ≤ 70°C), (Note 2)

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

44-Pin PLCC ..................................................... 1.23W

40-Pin Plastic PDIP .......................................... 1.23W

*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: VS = +9V, fCLK = 16 kHz, and TA = +25°C, unless otherwise noted.

Symbol

Parameter

Test Conditions

Min

Typ

Max

Unit

Input

Zero Input Reading

VIN = 0V

–000.0

±000.0

+000.0

Digital

Full Scale = 200 mV

Reading

Zero Reading Drift

VIN = 0V, 0°C ≤ TA ≤ +70°C

—

0.2

µV/°C

Ratiometric Reading

VIN = VREF, VREF = 100 mV

999

999/1000

1000

Digital

Reading

Linearity Error

Full Scale = 200 mV or 2V

– 1

±0.2

Count

Max Deviation From Best Fit

Straight Line

Roll-Over Error

–VIN = +VIN ≈ 200 mV

– 1

±0.2

1 Count

Noise

VIN = 0V, Full Scale = 200 mV

—

µVP-P

Input Leakage Current

VIN = 0V

—

CMRR

Common-Mode Rejection

VCM = ±1V, VIN = 0V,

—

µV/V

Ratio

Full Scale = 200 mV

Scale Factor Temperature

VIN = 199 mV, 0°C ≤ TA ≤ +70°C

—

ppm/

°C

Coefficient

Ext Ref Temp Coeff = 0 ppm/

°C

Analog Common

VCTC

Analog Common

250 k

Ω Between Common and V+

—

Temperature Coefficient

°C ≤ TA ≤ +70°C ("C" Devices):

—

TC7126

—

ppm/

°C

TC7126A

—

ppm/

°C

– 25

°C ≤ TA ≤ +85°C ("I" Device):

TC7126A

—

100

ppm/

°C

Analog Common Voltage

250 k

Ω Between Common and V+

2.7

3.05

3.35

LCD Drive

VSD

LCD Segment Drive Voltage

V+ to V– = 9V

VP-P

VBD

LCD Backplane Drive Voltage

V+ to V– = 9V

VP-P

Power Supply

Power Supply Current

VIN = 0V, V+ to V– = 9V (Note 6)

—

100

µA

NOTES: 1. Input voltage may exceed supply voltages when input current is limited to 100

µA.

2. Dissipation rating assumes device is mounted with all leads soldered to PC board.

3. Refer to "Differential Input" discussion.

4. Backplane drive is in-phase with segment drive for "OFF" segment and 180

° out-of-phase for "ON" segment. Frequency is 20 times

conversion rate. Average DC component is less than 50 mV.

5. See "Typical Operating Circuit."

6. During auto-zero phase, current is 10–20

µA higher. A 48 kHz oscillator increases current by 8 µA (typical). Common current not

included.

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