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PDF TC7107A Data sheet ( Hoja de datos )

Número de pieza TC7107A
Descripción 3-1/2 DIGIT A/D CONVERTERS
Fabricantes TelCom 
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1TC7106
TC7106A
TC7107
TC7107A
3-1/2 DIGIT A/D CONVERTERS
FEATURES
s Internal Reference with Low Temperature Drift
TC7106/7 ....................................... 80ppm/°C Typical
TC7106A/7A .................................. 20ppm/°C Typical
s Drives LCD (TC7106) or LED (TC7107) Display
Directly
s Guaranteed Zero Reading With Zero Input
s Low Noise for Stable Display
s Auto-Zero Cycle Eliminates Need for Zero
Adjustment
s True Polarity Indication for Precision Null
Applications
s Convenient 9 V Battery Operation (TC7106A)
s High Impedance CMOS Differential Inputs .... 1012
s Differential Reference Inputs Simplify Ratiometric
Measurements
s Low Power Operation ..................................... 10mW
ORDERING INFORMATION
PART CODE
TC710X 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):
Package
Code Package
CKW
CLW
CPL
IPL
IJL
44-Pin PQFP
44-Pin PLCC
40-Pin PDIP
40-Pin PDIP
40-Pin CerDIP
Pin Layout
Formed Leads
Normal
Normal
Normal
Temperature
Range
0°C to +70°C
0°C to +70°C
0°C to +70°C
– 25°C to +85°C
– 25°C to +85°C
AVAILABLE PACKAGES
40-Pin Plastic DIP
40-Pin CERDIP
GENERAL DESCRIPTION
The TC7106A and TC7107A 3-1/2 digit direct-display
drive analog-to-digital converters allow existing 7106/7107
based systems to be upgraded. Each device has a preci-
sion reference with a 20ppm/°C max temperature coeffi-
cient. This represents a 4 to 7 times improvement over
similar 3-1/2 digit converters. Existing 7106 and 7107 based
systems may be upgraded without changing external pas-
sive component values. The TC7107A drives common
anode light emitting diode (LED) displays directly with 8mA
per segment. A low-cost, high-resolution indicating meter
requires only a display, four resistors, and four capacitors.
The TC7106A low power drain and 9V battery operation
make it suitable for portable applications.
The TC7106A/TC7107A 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 1012input impedance. The
differential reference input allows ratiometric measurements
for ohms or bridge transducer measurements. The
15µVP–P noise performance guarantees a “rock solid” read-
ing. The auto-zero cycle guarantees a zero display read-
ing with a zero-volts input.
2
3
4
5
+
ANALOG
INPUT
1M
0.01µF
0.1µF
34
CR+EF
31 VI+N
33
CREF
2–19
22–25
LCD DISPLAY (TC7106/A) OR
COMMON ANODE LED
DISPLAY (TC7107/A)
SEGMENT
DRIVE
30 VIN
32 ANALOG
COMMON
POL
BP
V+
20
MINUS SIGN
21
1
BACKPLANE
DRIVE
47k
0.22µF
28
VBUFF
TC7106/A
TC7107/A
0.47µF
V+REF 36
VREF
29 CAZ
V–REF 35 100mV
27 VINT
V26
OSC2 OSC3 OSC1
39 38 COSC 40
24k
1k
+
9V
TO ANALOG
COMMON (PIN 32)
ROSC 100pF
100k
3 CONVERSIONS/SEC
200mV FULL SCALE
6
7
Figure 1. TC7106/A/7/A Typical Operating Circuit
44-Pin Plastic Quad Flat
Package Formed Leads
44-Pin Plastic Chip
Carrier PLCC
TELCOM SEMICONDUCTOR, INC.
TC7106/6A/7/7A-7 11/4/96
3-183
8

1 page




TC7107A pdf
3-1/2 DIGIT A/D CONVERTERS
PIN DESCRIPTION
Pin No.
40-Pin PDIP
(Normal)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
Pin No.
40-Pin PDIP
(Reverse)
(40)
(39)
(38)
(37)
(36)
(35)
(34)
(33)
(32)
(31)
(30)
(29)
(28)
(27)
(26)
(25)
(24)
(23)
(22)
(21)
(20)
22 (19)
23 (18)
24 (17)
25 (16)
26 (15)
27 (14)
28 (13)
29 (12)
Symbol
V+
D1
C1
B1
A1
F1
G1
E1
D2
C2
B2
A2
F2
E2
D3
B3
F3
E3
AB4
POL
BP
GND
G3
A3
C3
G2
V
VINT
VBUFF
CAZ
30 (11)
31 (10)
32 (9)
33 (8)
V
IN
V
+
IN
ANALOG
COMMON
C
REF
TELCOM SEMICONDUCTOR, INC.
TC7106
TC7106A
TC7107
TC7107A
1
2
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.
LCD Backplane drive output (TC7106A).
Digital ground (TC7107A).
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
INTEGRATING CAPACITOR section for more details
Integration resistor connection. Use a 47kresistor for a 200mV full-
scale range and a 470kresistor for 2V full-scale range.
The size of the auto-zero capacitor influences system noise. Use a
0.47µF capacitor for 200mV full scale, and a 0.047µF capacitor for
2V full scale. See Paragraph on AUTO-ZERO CAPACITOR for more
details.
The analog LOW input is connected to this pin.
The analog 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. It also acts as a reference voltage
source. See paragraph on ANALOG COMMON for more details.
See pin 34.
3
4
5
6
7
8
3-187

5 Page





TC7107A arduino
3-1/2 DIGIT A/D CONVERTERS
TC7106
TC7106A
TC7107
TC7107A
1
Integrating Capacitor – CINT
CINT should be selected to maximize the integrator
output voltage swing without causing output saturation. Due
to the TC7106A/7107A superior temperature coefficient
specification, analog common will normally supply the differ-
ential voltage reference. For this case a ±2V full-scale
integrator output swing is satisfactory. For 3 readings/
second (fOSC = 48kHz) a 0.22µF value is suggested. If a
different oscillator frequency is used, CINT must be changed
in inverse proportion to maintain the nominal ±2 V integrator
swing.
An exact expression for CINT is:
(4000) ( 1 ) ( VFS )
CINT =
fOSC RINT
VINT
Where:
fOSC = Clock frequency at Pin 38
VFS = Full-scale input voltage
RINT = Integrating resistor
VINT = Desired full-scale integrator output swing
CINT must have low dielectric absorption to minimize
rollover error. A polypropylene capacitor is recommended.
Integrating Resistor – RINT
The input buffer amplifier and integrator are designed
with class A output stages. The output stage idling current
is 100µA. The integrator and buffer can supply 20µA drive
currents with negligible linearity errors. RINT is chosen to
remain in the output stage linear drive region but not so large
that printed circuit board leakage currents induce errors. For
a 200mV full-scale, RINT is 47k. 2.0V full-scale requires
470k.
Component
Nominal Full-Scale Voltage
Value
CAZ
RINT
CINT
Note:1.
200.0mV
0.47µF
47k
0.22µF
fOSC = 48kHz (3 readings/sec)
2.000V
0.047µF
470k
0.22µF
Oscillator Components
ROSC (Pin 40 to Pin 39) should be 100k. COSC is
selected using the equation:
0.45
fOSC = RC
2
For fOSC of 48kHz, COSC is 100pF nominally.
Note that fOSC is divided by four to generate the TC7106A
internal control clock. The backplane drive signal is derived
by dividing fOSC by 800.
To achieve maximum rejection of 60Hz noise pickup,
the signal-integrate period should be a multiple of 60Hz.
Oscillator frequencies of 240kHz, 120kHz, 80kHz, 60kHz,
48kHz, 40kHz, etc. should be selected. For 50 Hz rejection,
oscillator frequencies of 200kHz, 100kHz, 66 2/3kHz, 50kHz,
40kHz, etc. would be suitable. Note that 40kHz (2.5 read-
ings/second) will reject both 50Hz and 60Hz.
Reference Voltage Selection
A full-scale reading (2000 counts) requires the input
signal be twice the reference voltage.
3
4
Required Full-Scale Voltage*
200.0mV
2.000V
* VFS = 2 VREF
VREF
100.0mV
1.000V
In some applications a scale factor other than unity may
exist between a transducer output voltage and the required
digital reading. Assume, for example, a pressure transducer
output is 400mV for 2000 lb/in2. Rather than dividing the
input voltage by two the reference voltage should be set to
200mV. This permits the transducer input to be used
directly.
The differential reference can also be used when a
digital zero reading is required when VIN is not equal to zero.
This is common in temperature measuring instrumentation.
A compensating offset voltage can be applied between
analog common and VI–N. The transducer output is con-
nected
between
V
+
IN
and
analog
common.
The internal voltage reference potential available at
analog common will normally be used to supply the convert-
er's reference. This potential is stable whenever the supply
potential is greater than approximately 7V. In applications
where an externally-generated reference voltage is desired,
refer to Figure 7.
5
6
7
8
TELCOM SEMICONDUCTOR, INC.
3-193

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