TC7136ARCLW datasheet, PDF - EEWORLD Datasheet

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TC7136ARCLW: Description1-CH DUAL-SLOPE ADC, PQCC44, PLASTIC, LCC-44; CategoryAnalog mixed-signal IC converter; File Size135KB，15 Pages; ManufacturerMicrochip; Websitehttps://www.microchip.com; Environmental Compliance

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TC7136ARCLW Overview

1-CH DUAL-SLOPE ADC, PQCC44, PLASTIC, LCC-44

TC7136ARCLW Parametric

Parameter Name	Attribute value
Is it Rohs certified?	conform to
Maker	Microchip
Parts packaging code	LCC
package instruction	QCCJ,
Contacts	44
Reach Compliance Code	compliant
ECCN code	EAR99
Converter type	ADC, DUAL-SLOPE
JESD-30 code	S-PQCC-J44
JESD-609 code	e3
length	16.5862 mm
Humidity sensitivity level	1
Number of analog input channels	1
Number of functions	1
Number of terminals	44
Maximum operating temperature	70 °C
Minimum operating temperature
Output bit code	BINARY
Package body material	PLASTIC/EPOXY
encapsulated code	QCCJ
Package shape	SQUARE
Package form	CHIP CARRIER
Peak Reflow Temperature (Celsius)	245
Certification status	Not Qualified
Maximum seat height	4.57 mm
Nominal supply voltage	9 V
surface mount	YES
Temperature level	COMMERCIAL
Terminal surface	Matte Tin (Sn)
Terminal form	J BEND
Terminal pitch	1.27 mm
Terminal location	QUAD
Maximum time at peak reflow temperature	40
width	16.5862 mm

TC7136ARCLW Preview

TC7136

TC7136A

Low Power 3-1/2 Digit Analog-To-Digital Converters

FEATURES

Fast Overrange Recovery, First

Reading Accuracy

Low Temperature Drift Internal Reference

TC7136 ...................................... 70 ppm/

C Typ.

TC7136A ..................................... 35ppm/

C Typ.

Zero Reading With Zero Input

Low Noise .................................................... 15

P-P

High Resolution .............................................. 0.05%

Low Input Leakage Current ...................... 1pA Typ.

10pA Max

Precision Null Detectors With True Polarity at

Zero

High-Impedance Differential Input

Convenient 9V Battery Operation With

Low Power Dissipation ........................ 500

W Typ.

900

W Max

GENERAL DESCRIPTION

The TC7136 and TC7136A are low-power, 3-1/2 digit

with liquid crystal display (LCD) drivers with analog-to-

digital converters. These devices incorporate an "integra-

tor output zero" phase which enables overrange

recovery. The performance of existing TC7126, TC7126A

and ICL7126-based systems may be upgraded with minor

changes to external, passive components.

The TC7136A has an improved internal zener refer-

ence voltage circuit which maintains the analog common

temperature drift to 35ppm/°C (typical) and 75 ppm/°C

(maximum). This represents an improvement of two to four

times over similar 3-1/2 digit converters. The costly, space-

consuming external reference source may be removed.

The TC7136/A limits linearity error to less than 1 count

on 200mV or 2V full-scale ranges. Roll-over error — the

difference in readings for equal magnitude but opposite

polarity input signals — is below

±1

count. High-impedance

differential inputs offer 1 pA leakage currents and a 10

Ω

input impedance. The differential reference input allows

ratiometric measurements for ohms or bridge transducer

measurements. The 15µV

P-P

noise performance guaran-

tees a "rock solid" reading. The auto-zero cycle enables a

zero display readout for a 0V input.

TYPICAL OPERATING CIRCUIT

0.1

µF

C+

–

REF

9–19 SEGMENT

22–25 DRIVE

TC7136

TC7136A POL

V+

240 kΩ

V+

10 kΩ

TYPICAL APPLICATIONS

Thermometry

Bridge Readouts: Strain Gauges, Load Cells, Null

Detectors

Digital Meters: Voltage/Current/Ohms/Power, pH

Digital Scales, Process Monitors

Portable Instrumentation

ORDERING INFORMATION

PART CODE

TC7136X X XXX

A or blank*

R (reversed pins) or blank (CPL pkg only)

* "A" parts have an improved reference TC

Package Code

(see below):

Package

Code

Package

CKW

CLW

CPL

44-Pin PQFP

44-Pin PLCC

40-Pin PDIP

LCD

1 MΩ

ANALOG

INPUT

–

0.01

µF

REF

–

30 V

MINUS SIGN

32 ANALOG

COMMON

BACKPLANE

Pin Layout

Formed Leads

—

Normal

Temperature

Range

0°C to +70°C

180 kΩ

0.47

µF

BUFF

REF

0.15

µF

REF

–

INT

OSC

38 COSC 40

ROSC 50 pF

560 kΩ

V–

1 CONVERSION/SEC

AVAILABLE PACKAGES

TO ANALOG COMMON

(PIN 32)

40-Pin Plastic DIP

44-Pin Plastic Quad Flat

Package Formed Leads

44-Pin Plastic Chip

Carrier PLCC

DS21461A

TC7136-6

10/18/96

Low Power 3-1/2 Digit Analog-To-

Digital Converters

TC7136

TC7136A

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

Package Power Dissipation (T

≤

70°C) (Note 2)

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

Plastic Quad Flat Package ...............................1.00W

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

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

*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:

= 9V, f

CLK

= 16 kHz, and T

= +25°C, unless otherwise noted.

Symbol

Input

Zero Input Reading

Zero Reading Drift

Ratiometric Reading

Nonlinearity Error

= 0V

Full Scale = 200 mV

= 0V, 0°C

≤

+70°C

= V

REF

, V

REF

= 100mV

Full Scale = 20 mV or 2V

Max Deviation From Best

Straight Line

–V

= +V

≈

200mV

= 0V, Full Scale = 200mV

= 0V

±1V,

= 0V,

Full Scale = 200 mV

= 199 mV, 0°C

≤

+70°C

Ext Ref Temp Coeff = 0ppm/°C

250 kΩ Between Common and V

0°C

≤

+70°C

TC7136A

"C" Commercial Temp TC7136

Range Devices

TC7136A

– 25°C

≤

+85°C

"I" Industrial Temp

TC7136

Range Devices

250 kW Between Common and V

to V

–

= 9V

to V

–

= 9V

= 0V, V

to V

–

= 9V (Note 6)

– 000.0

—

999

–1

±000.0

0.2

999/1000

±0.2

+000.0

1000

Digital

Reading

µV/°C

Digital

Reading

Count

Parameter

Test Conditions

Min

Typ

Max

Unit

CMRR

Roll-Over Error

Noise

Input Leakage Current

Common-Mode Rejection

Ratio

Scale Factor Temperature

Coefficient

Analog Common

Temperature Coefficient

—

–1

±0.2

—

1 Count

µV

P-P

µV/V

ppm/°C

Analog Common

CTC

—

2.7

—

3.05

150

100

150

3.35

100

ppm/°C

P-P

µA

Analog Common Voltage

LCD Segment Drive Voltage

LCD Backplane Drive Voltage

Power Supply Current

LCD Drive

NOTES:

Power Supply

Input voltages may exceed supply voltages when input current is limited to 100µA.

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

Refer to "Differential Input" discussion.

Backplane drive is inphase 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 50mV.

5. See "Typical Operating Circuit".

6. A 48kHz oscillator increases current by 20

µA

(typical). Common current not included.

DS21461A

TC7136-6

10/18/96

Low Power 3-1/2 Digit Analog-To-

Digital Converters

TC7136

TC7136A

PIN CONFIGURATIONS

REF LO

C REF

–

REF

REF HI

OSC 1

OSC 2

OSC 3

IN LO

BUFF

TEST

COM

IN HI

44 43

41 40 39

INT

V–

REF LO

C REF

COMMON

IN HI

TEST

OSC

–

OSC

TC7136CLW

TC7136ACLW

(PLCC)

IN LO

BUFF

INT

–

12 13

TC7136CKW

TC7136ACKW

(PQFP)

POL

18 19

21 22

AB4

POL

V+

1's

40 OSC 1

NORMAL PIN

CONFIGURATION 39 OSC 2

38 OSC 3

37 TEST

36 V REF

35 V –

REF

34 CREF

–

33 CREF

32 ANALOG

COMMON

31 V IN

30 V –

29 CAZ

28 VBUFF

27 V INT

26 V –

25 G

24 C 3

23 A 3

22 G 3

OSC 1

OSC 2

OSC 3

REVERSE PIN

CONFIGURATION 39 D1

38 C1

37 B1

36 A1

40 V +

C2 10

10's

B2 11

A2 12

F2 13

E 2 14

D3 15

100's

B3 16

F3 17

E 3 18

1000's

AB 4 19

POL 20

(MINUS SIGN)

TC7136CPL

TC7136ACPL

(PDIP)

TEST 4

V REF 5

–

VREF 6

CREF 7

–

CREF 8

ANALOG 9

COMMON

V IN 10

V – 11

CAZ 12

VBUFF 13

V INT 14

V – 15

G 2 16

1's

34 G1

33 E 1

32 D2

TC7136RCPL

TC7136ARCPL

(Reversed)

PDIP

31 C2

30 B2

29 A2

10's

27 E 2

26 D3

25 B3

100's

C 3 17

A 3 18

G 3 19

100's

23 E 3

22 AB4

1000's

21 POL

(MINUS SIGN)

21 BP

(BACKPLANE)

BP 20

(BACKPLANE)

NC = NO INTERNAL CONNECTION

DS21461A

TC7136-6

10/18/96

Low Power 3-1/2 Digit Analog-To-

Digital Converters

TC7136

TC7136A

TC7136/A PIN DESCRIPTION

Pin No.

40-Pin PDIP

Normal

(Reverse)

(40)

(39)

(38)

(37)

(36)

(35)

(34)

(33)

(32)

(31)

(30)

(29)

(28)

(27)

(26)

(25)

(24)

(23)

(22)

(21)

(20)

(19)

(18)

(17)

(16)

(15)

(14)

Name

POL

–

INT

Description

Positive supply voltage.

Activates the D section of the units display.

Activates the C section of the units display.

Activates the B section of the units display.

Activates the A section of the units display.

Activates the F section of the units display.

Activates the G section of the units display.

Activates the E section of the units display.

Activates the D section of the tens display.

Activates the C section of the tens display.

Activates the B section of the tens display.

Activates the A section of the tens display

Activates the F section of the tens display.

Activates the E section of the tens display.

Activates the D section of the hundreds display.

Activates the B section of the hundreds display.

Activates the F section of the hundreds display.

Activates the E section of the hundreds display.

Activates both halves of the 1 in the thousands display.

Activates the negative polarity display.

Backplane drive output.

Activates the G section of the hundreds display.

Activates the A section of the hundreds display.

Activates the C section of the hundreds display.

Activates the G section of the tens display.

Negative power supply voltage.

The integrating capacitor should be selected to give the maximum voltage

swing that ensures component tolerance buildup will not allow the integrator

output to saturate. When analog common is used as a reference and the

conversion rate is 3 readings per second, a 0.047µF capacitor may be used.

The capacitor must have a low dielectric constant to prevent roll-over errors.

See Integrating Capacitor section for additional details.

Integration resistor connection. Use a 180kΩ for a 20 mV full-scale range and

a 1.8MΩ for 2V full-scale range.

The size of the auto-zero capacitor influences the system noise. Use a 0.47µF

capacitor for a 200mV full scale, and a 0.1µF capacitor for a 2V full scale. See

paragraph on Auto-Zero Capacitor for more details.

The low input signal is connected to this pin.

The high input signal is connected to this pin.

This pin is primarily used to set the analog common-mode voltage for battery

operation or in systems where the input signal is referenced to the power

supply. See paragraph on Analog Common for more details. It also acts as a

reference voltage source.

(13)

(12)

BUFF

(11)

(10)

(9)

–

ANALOG

COMMON

TC7136-6

10/18/96

DS21461A

Low Power 3-1/2 Digit Analog-To-

Digital Converters

TC7136

TC7136A

TC7136/A PIN DESCRIPTION

(Cont.)

Pin No.

40-Pin PDIP

Normal

(Reverse)

(8)

(7)

Name

REF

–

Description

See pin 34.

A 0.1µF capacitor is used in most applications. If a large common-mode

–

voltage exists (for example, the V

pin is not at analog common), and a 200

mV scale is used, a 1µF capacitor is recommended and will hold the roll-over

error to 0.5 count.

See pin 36.

The analog input required to generate a full-scale output (1999 counts). Place

100 mV between pins 35 and 36 for 199.9 mV full scale. Place 1V between

pins 35 and 36 for 2V full scale. See paragraph on Reference Voltage.

Lamp test. When pulled HIGH (to V

) all segments will be turned ON and the

display should read –1888. It may also be used as a negative supply for exter-

nally-generated decimal points. See paragraph under Test for additional informa-

tion.

See pin 40.

Pins 40, 39 and 38 make up the oscillator section. For a 48kHz clock (3 readings per

second) connect pin 40 to the junction of a 180 kΩ resistor and a 50pF capacitor. The

180kΩ resistor is tied to pin 39 and the 50pF capacitor is tied to pin 38.

CINT

ANALOG

INPUT

SIGNAL

INTEGRATOR

–

(6)

(5)

–

REF

(4)

TEST

(3)

(2)

(1)

OSC

SWITCH

DRIVER

REF

VOLTAGE

PHASE

CONTROL

LOGIC

POLARITY CONTROL

INTEGRATOR

OUTPUT

(1) Input signal integration

(2) Reference voltage integration (deintegration)

The input signal being converted is integrated for a fixed

time period (t

), measured by counting clock pulses. An

opposite polarity constant reference voltage is then inte-

grated until the integrator output voltage returns to zero. The

reference integration time is directly proportional to the input

signal (t

In a simple dual-slope converter, a complete conversion

requires the integrator output to "ramp-up" and "ramp-

down."

A simple mathematical equation relates the input signal,

reference voltage, and integration time:

DISPLAY

VIN

VARIABLE

REFERENCE

INTEGRATE

TIME

VFULL SCALE

1.2 VFULL SCALE

FIXED

SIGNAL

INTEGRATE

TIME

Figure 1. Basic Dual-Slope Converter

where:

= Reference voltage

= Signal integration time (fixed)

= Reference voltage integration time (variable).

For a constant V

= V

∫

(t) dt =

[]

TC7136-6

10/18/96

DS21461A

The TC7136/A is a dual-slope, integrating analog-to-

digital converter. An understanding of the dual-slope con-

version technique will aid in following detailed TC7136/A

operational theory.

The conventional dual-slope converter measurement

cycle has two distinct phases:

–

CLOCK

COUNTER

GENERAL THEORY OF OPERATION

(All Pin designations refer to 40-Pin Dip)

Dual-Slope Conversion Principles

COMPARATOR

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