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PDF TC7116 Data sheet ( Hoja de datos )

Número de pieza TC7116
Descripción 3-1/2 DIGIT ANALOG-TO-DIGITAL CONVERTERS WITH HOLD
Fabricantes TelCom 
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No Preview Available ! TC7116 Hoja de datos, Descripción, Manual

1TC7116
TC7116A
TC7117
TC7117A
3-1/2 DIGIT ANALOG-TO-DIGITAL CONVERTERS WITH HOLD
FEATURES
s Low Temperature Drift Internal Reference
TC7116/TC7117 ............................. 80 ppm/°C Typ
TC7116A/TC7117A ........................ 20 ppm/°C Typ
s Display Hold Function
s Directly Drives LCD or LED Display
s Guaranteed Zero Reading With Zero Input
s Low Noise for Stable
Display ......... 2V or 200 mV Full-Scale Range (FSR)
s Auto-Zero Cycle Eliminates Need for Zero
Adjustment Potentiometer
s True Polarity Indication for Precision Null
Applications
s Convenient 9V Battery Operation
(TC7116/TC7116A)
s High Impedance CMOS Differential Inputs .... 1012
s Low Power Operation .................................... 10 mW
ORDERING INFORMATION
PART CODE
TC711X X X XXX
}6 = LCD
7 = LED
A or blank*
R (reversed pins) or blank (CPL pkg. only)
* "A" parts have an improved reference TC
Package Code (see below):
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 liquid crystal
displays (LCDs) and includes a backplane driver. The
TC7117A drives common anode light emitting diode (LED)
displays directly with an 8-mA drive current per segment.
These devices incorporate a display hold (HLDR)
function. The displayed reading remains indefinitely, as
long as HLDR is held high. Conversions continue, but
output data display latches are not updated. The reference
low input (VR–EF) is not available as it is with the TC7106/
7107. VR–EF is tied internally to analog common in the
TC7116A/7117A devices.
The TC7116A/7117A reduces linearity error to less
than 1 count. 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 current and a 1012input impedance. The 15
µVP-P noise performance guarantees a “rock solid” reading.
The auto-zero cycle guarantees a zero display 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.
2
3
4
5
Package
Code
Package
CKW
CLW
CPL
IJL
44-Pin PQFP
44-Pin PLCC
40-Pin Plastic DIP
40-Pin CerDIP
AVAILABLE PACKAGES
40-Pin Plastic
DIP
40-Pin CerDIP
Temperature
Range
0°C to +70°C
0°C to +70°C
0°C to +70°C
– 25°C to +85°C
44-Pin Plastic Quad Flat
Package Formed Leads
44-Pin Plastic Chip
Carrier PLCC
TELCOM SEMICONDUCTOR, INC.
1 M
+
ANALOG
INPUT
0.01 µF
0.1 µF
DISPLAY
HOLD LCD DISPLAY (TC7116/7116A)
34 33 1
OR COMMON ANODE LED
CR+ EF
31 VI+N
CR– EF HLDR
DISPLAY (TC7117/7117A)
2–19 SEGMENT
22–25 DRIVE
30 VI–N
32 ANALOG
COMMON
POL 20
MINUS SIGN
BP/GND 21
V+ 35
BACKPLANE
DRIVE
47 k
0.22 µF
28
VBUFF
TC7116/A
TC7117/A
24 k
0.47 µF
29 CAZ
36
VR+EF
VREF
100 mV
1 k
+
9V
27 VINT
V– 26
OSC2 OSC3 OSC1
39 38 COSC 40
TO ANALOG
COMMON (PIN 32)
ROSC 100 pF
3 CONVERSIONS/SEC
100 k
Figure 1. Typical TC7116/A/7/A Operating Circuit
TC7116/A/7117/A-7 10/18/96
3-203
6
7
8

1 page




TC7116 pdf
3-1/2 DIGIT ANALOG-TO-DIGITAL
CONVERTERS WITH HOLD
PIN DESCRIPTION
40-Pin PDIP/
40-PinCerDIP
Pin Number
Normal
1
2
3
4
5
6
7
8
10
11
12
13
14
15
16
17
18
19
20
21
44-Pin
Plastic Quad
Flat Package
Pin Number
8
9
10
11
12
13
14
15
9
17
18
19
20
21
22
23
24
25
26
27
28
22 29
23 30
24 31
25 32
26 34
27 35
28 36
29 37
30 38
31 39
39 40
Symbol
HLDR
D1
C1
B1
A1
F1
G1
E1
16
C2
B2
A2
F2
E2
D3
B3
F3
E3
AB4
POL
BP
GND
G3
A3
C3
G2
V
VINT
VBUFF
CAZ
VI–N
V+IN
COMMON
TELCOM SEMICONDUCTOR, INC.
TC7116
TC7116A
TC7117
TC7117A
1
2
Description
Hold pin, Logic 1 holds present display reading.
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.
D2 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.
LCD backplane drive output (TC7116/TC7116A).
Digital ground (TC7117/TC7117A).
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.
Integrator output. Connection point for integration
capacitor. See Integration Capacitor section for
additional details.
Integration resistor connection. Use a 47 kresis tor for
200 mV full-scale range and a 470 kresistor for 2V
full-scale range.
The size of the auto-zero capacitor influences system
noise. Use a 0.47 µF capacitor for 200 mV full scale and
a 0.047 µF capacitor for 2V full scale. See Auto-Zero
Capacitor paragraph for more details.
The analog LOW input is connected to this pin.
The analog HIGH input is connected to this pin.
This pin is primarily used to set the analog common-
mode COMMON voltage for battery operation or in
systems where the input signal is referenced to the
power supply. See Analog Common paragraph for more
details. It also acts as a reference voltage source.
3
4
5
6
7
8
3-207

5 Page





TC7116 arduino
3-1/2 DIGIT ANALOG-TO-DIGITAL
CONVERTERS WITH HOLD
1TC7116
TC7116A
TC7117
TC7117A
COMPONENT VALUE SELECTION
Auto-Zero Capacitor
The size of the auto-zero capacitor has some influ-
ence on system noise. For 200 mV full scale, where noise
is very important, a 0.47 µF capacitor is recommended. On
the 2V scale, a 0.047 µF capacitor increases the speed of
recovery from overload and is adequate for noise on this
scale.
Reference Capacitor
A 0.1 µF capacitor is acceptable in most applications.
However, where a large common-mode voltage exists (i.e.,
the VI–N pin is not at analog common), and a 200-mV scale
is used, a larger value is required to prevent roll-over error.
Generally, 1 µF will hold the roll-over error to 0.5 count in
this instance.
Integrating Capacitor
The integrating capacitor should be selected to give the
maximum voltage swing that ensures tolerance build-up 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 ±5V supplies and analog com-
mon tied to supply ground, a ±3.5V to ±4V swing is nominal.
For 3 readings per second (48 kHz clock), nominal values
for CINT are 0.22 µ1F and 0.10 µF, respectively. If different
oscillator frequencies are used, these values should be
changed in inverse proportion to maintain the output swing.
The integrating capacitor must have low dielectric ab-
sorption to prevent roll-over errors. Polypropylene capaci-
tors are recommended for this application.
Integrating Resistor
Both the buffer amplifier and the integrator have a class
A output stage with 100 µA of quiescent current. They can
supply 20 µA of drive current with negligible nonlinearity.
The integrating resistor should be large enough to remain
in this very linear region over the input voltage range, but
small enough that undue leakage requirements are not
placed on the PC board. For 2V full scale, 470 kis near
optimum and, similarly, 47 kfor 200 mV full scale.
Oscillator Components
For all frequency ranges, a 100-kresistor is recom-
mended; the capacitor is selected from the equation:
f = 45 .
RC
For a 48 kHz clock (3 readings per second), C = 100 pF.
TELCOM SEMICONDUCTOR, INC.
Reference Voltage
To generate full-scale output (2000 counts), the analog
input requirement is VIN = 2 VREF. Thus, for the 200 mV and
2V scale, VREF should equal 100 mV and 1V, respectively.
In many applications, where the ADC is connected to a
transducer, a scale factor exists between the input voltage
and the digital reading. For instance, in a measuring system
the designer might like to have a full-scale reading when the
voltage from the transducer is 700 mV. Instead of dividing
the input down to 200 mV, the designer should use the input
voltage directly and select VREF = 350 mV. Suitable values
for integrating resistor and capacitor would be 120 kand
0.22 µF. This makes the system slightly quieter and also
avoids a divider network on the input. The TC7117/TC7117A,
with ±5V supplies, can accept input signals up to ±4V.
Another advantage of this system is when a digital reading
of zero is desired for VIN 0. Temperature and weighing
systems with a variable tare are examples. This offset
reading can be conveniently generated by connecting the
voltage transducer between V+IN and analog common, and
the variable (or fixed) offset voltage between analog com-
mon and VI–N.
2
3
4
TC7117/TC7117A POWER SUPPLIES
The TC7117/TC7117A are designed to operate from
±5V supplies. However, if a negative supply is not available,
it can be generated with a TC7660 DC-to-DC converter and
two capacitors. Figure 10 shows this application.
In selected applications, a negative supply is not re-
quired. The conditions for using a single +5V supply are:
(1) The input signal can be referenced to the center of
the common-mode range of the converter.
(2) The signal is less than ±1.5V.
(3) An external reference is used.
5
6
+5V
LED
DRIVE
35
V+ VR+EF 36
32
COM
+
10 µF
2
4
8
TC7660
TC7117 VI+N 31
TC7117A
VIN 30
21
V– GND
5 (–5V) 26
TC04
+
VIN
3+
10 µF
Figure 10. Negative Power Supply Generation With TC7660
7
8
3-213

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