TC7116 Microchip, TC7116 Datasheet

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TC7116

Manufacturer Part Number
TC7116
Description
3-1/2 Digit Analog-to-Digital Converters with Hold
Manufacturer
Microchip
Datasheet

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Features
• Low Temperature Drift Internal Reference
• Display Hold Function
• Directly Drives LCD or LED Display
• Zero Reading with Zero Input
• Low Noise for Stable Display
• Auto-Zero Cycle Eliminates Need for Zero
• Adjustment Potentiometer
• True Polarity Indication for Precision Null
• Convenient 9V Battery Operation:
• High Impedance CMOS Differential Inputs: 10
• Low Power Operation: 10mW
Applications
• Thermometry
• Bridge Readouts: Strain Gauges, Load Cells,
• Digital Meters: Voltage/Current/Ohms/Power, pH
• Digital Scales, Process Monitors
• Portable Instrumentation
Device Selection Table
©
Package Code
- TC7116/TC7117 80 ppm/°C Typ.
- TC7116A/TC7117A 20 ppm/°C Typ.
- 2V or 200mV Full Scale Range (FSR)
Applications
(TC7116/TC7116A)
Null Detectors
2002 Microchip Technology Inc.
CKW
CLW
CPL
IJL
3-1/2 Digit Analog-to-Digital Converters with Hold
40-Pin CERDIP
44-Pin PQFP
44-Pin PLCC
40-Pin PDIP
Package
Temperature Range
-25°C to +85°C
0°C to +70°C
0°C to +70°C
0°C to +70°C
TC7116/A/TC7117/A
12
General Description
The TC7116A/TC7117A are 3-1/2 digit CMOS analog-
to-digital converters (ADCs) containing all the active
components necessary to construct a 0.05% resolution
measurement system. Seven-segment decoders,
polarity and digit drivers, voltage reference, and clock
circuit are integrated on-chip. The TC7116A drives liq-
uid crystal displays (LCDs) and includes a backplane
driver. The TC7117A drives common anode light emit-
ting diode (LED) displays directly with an 8mA drive
current per segment.
These devices incorporate a display hold (HLDR) func-
tion. The displayed reading remains indefinitely, as
long as HLDR is held high. Conversions continue, but
output data display latches are not updated. The refer-
ence low input (V
TC7106/7107. V
mon in the TC7116A/7117A devices.
The TC7116A/7117A reduces linearity error to less
than 1 count. Rollover error (the difference in readings
for equal magnitude but opposite polarity input signals)
is below ±1 count. High-impedance differential inputs
offer 1pA leakage current and a 10
ance. The 15µV
solid” reading. The auto-zero cycle ensures a zero dis-
play reading with a 0V input.
The TC7116A and TC7117A feature a precision, low
drift internal reference, and are functionally identical to
the TC7116/TC7117. A low drift external reference is
not normally required with the TC7116A/TC7117A.
P-P
REF
REF
noise performance enables a “rock
- is tied internally to analog com-
-) is not available, as it is with the
12
DS21457B-page 1
Ω input imped-

Related parts for TC7116

TC7116 Summary of contents

Page 1

... The auto-zero cycle ensures a zero dis- play reading with a 0V input. The TC7116A and TC7117A feature a precision, low drift internal reference, and are functionally identical to the TC7116/TC7117. A low drift external reference is not normally required with the TC7116A/TC7117A. 0°C to +70°C 0°C to +70°C 0° ...

Page 2

... IN TC7117IJL TC7117AIJL BUFF 27 V INT 100 BP/GND (TC7116/7117) (TC7116A/TC7117A) 44-Pin PQFP TC7116CKW BP/ 28 TC7116ACKW GND TC7117CKW 27 POL TC7117ACKW ...

Page 3

... Typical Application 1MΩ + Analog 0.01µF Input – 47kΩ 0.47µF 0.22µF 2002 Microchip Technology Inc. © TC7116/A/TC7117/A TC7116/A TC7117/A Display 0.1µF Hold LCD Display (TC7116/7116A) or Common Anode LED Display (TC7117/7117A) HLDR REF REF 31 2–19 Segment 22–25 ...

Page 4

... Backplane drive is in phase with segment drive for “OFF” segment, 180° out of phase for “ON” segment. Frequency is 20 times conversion rate. Average DC component is less than 50mV. 5: The TC7116/TC7116A logic inputs have an internal pull-down resistor connected from HLDR, Pin 1 to TEST, Pin 37. The TC7117/TC7117A logic inputs have an internal pull-down resistor connected from HLDR, Pin 1 to GND, Pin 21. ...

Page 5

... Backplane drive is in phase with segment drive for “OFF” segment, 180° out of phase for “ON” segment. Frequency is 20 times conversion rate. Average DC component is less than 50mV. 5: The TC7116/TC7116A logic inputs have an internal pull-down resistor connected from HLDR, Pin 1 to TEST, Pin 37. The TC7117/TC7117A logic inputs have an internal pull-down resistor connected from HLDR, Pin 1 to GND, Pin 21. ...

Page 6

... Activates the E section of the hundreds display Activates both halves of the 1 in the thousands display. 4 POL Activates the negative polarity display. BP/ LCD backplane drive output (TC7116/TC7116A). Digital ground GND (TC7117/TC7117A). G Activates the G section of the hundreds display Activates the A section of the hundreds display. ...

Page 7

... DETAILED DESCRIPTION (All Pin Designations Refer to 40-Pin PDIP.) 3.1 Analog Section Figure 3-1 shows the block diagram of the analog sec- tion for the TC7116/TC7116A and TC7117/TC7117A. Each measurement cycle is divided into three phases: (1) Auto-Zero (AZ), (2) Signal Integrate (INT), and (3) Reference Integrate (REF), or De-integrate (DE). 3.1.1 ...

Page 8

... V- 3.1.6 ANALOG COMMON This pin is included primarily to set the Common mode voltage for battery operation (TC7116/TC7116A), or for any system where the input signals are floating, with respect to the power supply. The analog common pin sets a voltage approximately 2.8V more negative than the positive supply. This is selected to give a minimum end of life battery voltage of about 6V ...

Page 9

... Digital Section Figure 3-5 and Figure 3-6 show the digital section for TC7116/TC7116A and TC7117/TC7117A, respectively. For the TC7116/TC7116A (Figure 3-5), an internal dig- ital ground is generated from a 6V zener diode and a large P-channel source follower. This supply is made stiff to absorb the relative large capacitive currents when the backplane (BP) voltage is switched ...

Page 10

... When HLDR logic HIGH, the latch will not be updated. Analog-to-digital conversions will continue, but will not be updated until HLDR is returned to LOW. To continuously update the display, connect to TEST (TC7116/TC7116A) or GROUND (TC7117/TC7117A), or disconnect. This input is CMOS compatible with 70kΩ typical resistance to TEST (TC7116/TC7116A) or GROUND (TC7117/TC7117A). Backplane 21 7-Segment ÷ ...

Page 11

... To Segment 8mA Digital Ground Internal Digital Ground To Switch Drivers From Comparator Output V+ Clock OSC1 OSC2 OSC3 2002 Microchip Technology Inc. © TC7116/A/TC7117/A 7-Segment 7-Segment Decode Decode Latch Thousands Hundreds Tens ÷ 4 Control Logic 1 ~70kΩ HLDR 7-Segment Decode Units ...

Page 12

... The integrating capacitor should be selected to give the maximum voltage swing that ensures tolerance buildup will not saturate the integrator swing (approximately 0.3V from either supply). In the TC7116/TC7116A or the TC7117/TC7117A, when the analog common is used as a reference, a nominal ±2V full scale integrator swing is acceptable. For the TC7117/TC7117A, with ± ...

Page 13

... Point B. 2002 Microchip Technology Inc. © TC7116/A/TC7117/A In addition to limiting maximum power dissipation, the resistor reduces change in power dissipation as the display changes. The effect is caused by the fact that, as fewer segments are ON, each ON output drops more voltage and current. For the best case of six seg- ments (a “ ...

Page 14

... TC7116/A/TC7117/A FIGURE 6-3: TC7116/TC7117A USING THE INTERNAL REFERENCE (200mV FULL SCALE, 3 READINGS PER SECOND - RPS) TC7116 TC7116A FIGURE 6-4: TC7117/TC7117A INTERNAL REFERENCE (200mV FULL SCALE, 3 RPS, V TC7117 TC7117A DS21457B-page 14 Set V = 100mV REF 40 100kΩ 100pF 36 22kΩ 0.1pF 1kΩ 33 1MΩ ...

Page 15

... FIGURE 6-5: CIRCUIT FOR DEVELOPING UNDER RANGE AND OVER RANGE SIGNALS FROM TC7116/TC7117A OUTPUTS O/R U/R CD4023 or 74C10 FIGURE 6-6: TC7117/TC7117A WITH A 1.2 EXTERNAL BANDGAP REFERENCE (V - TIED TO COMMON) IN TC7117 TC7117A 2002 Microchip Technology Inc. © TC7116/A/TC7117 Logic Logic TC7116 TC7116A CD4077 ...

Page 16

... TC7116/A/TC7117/A FIGURE 6-7: RECOMMENDED COMPONENT VALUES FOR 2V FULL SCALE (TC7116/TC7116A AND TC7117/TC7117A) TC7116 TC7116A TC7117 TC7117A FIGURE 6-8: TC7117/TC7117A OPERATED FROM SINGLE +5V SUPPLY (AN EXTERNAL REFERENCE MUST BE USED IN THIS APPLICATION) TC7117 TC7117A DS21457B-page 16 Set REF 40 100kΩ 100pF 36 24kΩ 0.1µ ...

Page 17

... Component Taping Orientation for 44-Pin PQFP Devices Carrier Tape, Number of Components Per Reel and Reel Size Package 44-Pin PQFP Note: Drawing does not represent total number of pins. 2002 Microchip Technology Inc. © TC7116/A/TC7117/A User Direction of Feed P Standard Reel Component Orientation for TR Suffix Device Carrier Width (W) Pitch (P) ...

Page 18

... TC7116/A/TC7117/A 7.3 Package Dimensions 40-Pin PDIP (Wide) 2.065 (52.45) 2.027 (51.49) .200 (5.08) .140 (3.56) .150 (3.81) .115 (2.92) .110 (2.79) .070 (1.78) .090 (2.29) .045 (1.14) 40-Pin CERDIP (Wide) .098 (2.49) MAX. 2.070 (52.58) 2.030 (51.56) .210 (5.33) .170 (4.32) .200 (5.08) .125 (3.18) .110 (2.79) .065 (1.65) .090 (2.29) .045 (1.14) DS21457B-page 18 PIN 1 .555 (14.10) .530 (13.46) .040 (1.02) .020 (0.51) .015 (0.38) .008 (0.20) .022 (0.56) ...

Page 19

... PQFP PIN 1 .018 (0.45) .012 (0.30) .031 (0.80) TYP. .398 (10.10) .390 (9.90) .557 (14.15) .537 (13.65) 2002 Microchip Technology Inc. © TC7116/A/TC7117/A PIN 1 .050 (1.27) TYP. .180 (4.57) .165 (4.19) 7° MAX. .009 (0.23) .005 (0.13) .398 (10.10) .390 (9.90) .557 (14.15) .537 (13.65) .096 (2.45) MAX. Dimenisons: inches (mm) .021 (0.53) .013 (0.33) ...

Page 20

... TC7116/A/TC7117/A PRODUCT IDENTIFICATION SYSTEM To order or obtain information, e.g., on pricing or delivery, refer to the factory or the listed sales office. PART CODE TC711X LCD } 7 = LED A or blank* R (reversed pins) or blank (CPL pkg only) * "A" parts have an improved reference TC Package Code (see Device Selection Table) ...

Page 21

... Microchip. No licenses are con- veyed, implicitly or otherwise, under any intellectual property rights. 2002 Microchip Technology Inc. © TC7116/ATC7117/A Trademarks The Microchip name and logo, the Microchip logo, FilterLab microID, MPLAB, PIC, PICmicro, PICMASTER, ...

Page 22

... Tel: 81-45-471- 6166 Fax: 81-45-471-6122 Korea Microchip Technology Korea 168-1, Youngbo Bldg. 3 Floor Samsung-Dong, Kangnam-Ku Seoul, Korea 135-882 Tel: 82-2-554-7200 Fax: 82-2-558-5934 Singapore Microchip Technology Singapore Pte Ltd. 200 Middle Road #07-02 Prime Centre Singapore, 188980 Tel: 65-6334-8870 Fax: 65-6334-8850 Taiwan Microchip Technology Taiwan 11F-3, No. 207 ...

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