TC7116CKWRT [MICROCHIP]
1-CH DUAL-SLOPE ADC, ACCESS, PQFP44, PLASTIC, QFP-44;
| 型号： | TC7116CKWRT |
| 厂家： | 
MICROCHIP |
| 描述： | 1-CH DUAL-SLOPE ADC, ACCESS, PQFP44, PLASTIC, QFP-44 |
| 文件： | 总18页 (文件大小：160K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
TC7116
TC7116A
TC7117
TC7117A
3-1/2 Digit Analog-To-Digital Convereters with Hold
FEATURES
GENERAL DESCRIPTION
■ Low Temperature Drift Internal Reference
TC7116/TC7117 ............................ 80 ppm/°C Typ.
TC7116A/TC7117A....................... 20 ppm/°C Typ.
■ Display Hold Function
■ Directly Drives LCD or LED Display
■ Guaranteed Zero Reading With Zero Input
■ Low Noise for Stable
Display .......... 2V or 200mV Full-Scale Range (FSR)
■ Auto-Zero Cycle Eliminates Need for Zero
Adjustment Potentiometer
■ True Polarity Indication for Precision Null
Applications
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 8mA 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.
■ Convenient 9V Battery Operation
(TC7116/TC7116A)
■ High Impedance CMOS Differential Inputs.... 1012Ω
■ Low Power Operation..................................... 10mW
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 1012Ω input impedance. The
15µVP-P noise performance guarantees a “rock solid”
reading. The auto-zero cycle guarantees a zero display
reading with a 0V input.
ORDERING INFORMATION
PART CODE
TC711X X XXX
6 = LCD
7 = LED
}
A or blank*
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.
* "A" parts have an improved reference TC
Package Code (see below):
Package
Code
Temperature
Range
Package
CKW
CLW
CPL
IJL
44-Pin PQFP
0°C to +70°C
0°C to +70°C
0.1 µF
33
DISPLAY
HOLD
LCD DISPLAY (TC7116/7116A)
OR COMMON ANODE LED
DISPLAY (TC7117/7117A)
44-Pin PLCC
1
34
+
–
C
REF
40-Pin Plastic DIP
40-Pin CerDIP
0°C to +70°C
HLDR
C
REF
1 MΩ
31
SEGMENT
DRIVE
+
2–19
22–25
+
V
– 25°C to +85°C
IN
ANALOG
INPUT
–
0.01 µF
TC7116/A
TC7117/A
20
POL
–
30
32
V
IN
BACKPLANE
DRIVE
MINUS SIGN
21
35
BP/GND
AVAILABLE PACKAGES
ANALOG
COMMON
+
V
40-Pin PDIP
40-Pin CDIP
24 kΩ
28
V
BUFF
+
47 kΩ
9V
36
26
V
REF
0.47 µF
+
V
REF
1 kΩ
C
AZ
100 mV
29
27
0.22 µF
–
V
V
INT
44-Pin PQFP
OSC OSC OSC
2
3
1
TO ANALOG
Formed Leads
COMMON (PIN 32)
C
OSC
39
38
40
3 CONVERSIONS/SEC
R
100 pF
OSC
100 kΩ
44-Pin Plastic Chip
Carrier PLCC
Figure 1. Typical TC7116/A/7/A Operating Circuit
© 2001 Microchip Technology Inc. DS21457A
TC7116/A/7117/A-7 9/17/99
3-1/2 Digit Analog-To-Digital
Convereters with Hold
TC7116
TC7116A
TC7117
TC7117A
Operating Temperature
ABSOLUTE MAXIMUM RATINGS*
“C” Device.............................................. 0°C to +70°C
“I” Device .......................................... – 25°C to +85°C
Storage Temperature ............................ – 65°C to +150°C
Lead Temperature (Soldering, 10 sec) ................. +300°C
Supply Voltage
TC7116/TC7116A: V+ to V– .................................15V
TC7117/TC7117A: V+ to GND............................. +6V
V– to GND ............................– 9V
Analog Input Voltage (Either Input) (Note 1) ........ V+ to V–
Reference Input Voltage (Either Input)................. V+ to V–
Clock Input
*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.
TC7116/TC7116A..................................... TEST to V+
TC7117/TC7117A...................................... GND to V+
Package Power Dissipation, TA ≤ 70°C (Note 2)
CDIP .................................................................2.29W
PDIP .................................................................1.23W
Plastic Chip Carrier (PLCC)..............................1.23W
Plastic Quad Flat Package (PQFP) ..................1.00W
ELECTRICAL CHARACTERISTICS (Note 3)
Parameter
Test Conditions
Min
Typ
Max
Unit
Zero Input Reading
VIN = 0V
—
±0
—
Digital
Full Scale = 200mV
Reading
Ratiometric Reading
VIN = VREF
VREF = 100mV
999
– 1
999/1000
1000
+1
Digital
Reading
Roll-Over Error (Difference in
Reading for Equal Positive and
Negative Readings Near Full Scale)
–VIN = +VIN 200mV or ≈ 2V
±0.2
Counts
Linearity (Maximum Deviation From
Best Straight Line Fit)
Full Scale = 200mV or 2V
– 1
—
—
—
±0.2
50
15
1
+1
—
—
10
Counts
µV/V
µV
Common-Mode Rejection Ratio (Note 4)
VCM = ±1V, VIN = 0V
Full Scale = 200mV
Noise (Peak-to-Peak Value Not
Exceeded 95% of Time)
VIN = 0V
Full Scale = 200mV
Leakage Current at Input
Zero Reading Drift
VIN = 0V
pA
VIN = 0V
“C” Device: 0°C to +70°C
“I” Device: –25°C to +85°C
—
—
0.2
1
1
2
µV/°C
µv/°C
Scale Factor Temperature Coefficient
VIN = 199 mV
“C” Device: 0°C to +70°C
(Ext Ref = 0 ppm/°C)
“I” Device: –25°C to +85°C
—
1
5
ppm/°C
—
30
—
70
—
20
—
ppm/°C
Input Resistance, Pin 1
VIL, Pin 1
Note 6
kΩ
V
TC7116/A Only
TC7117/A Only
Both
—
Test +1.5
GND +1.5
—
VIL, Pin 1
—
V+ – 1.5
—
V
VIH, Pin 1
—
V
Supply Current (Does Not Include
LED Current for 7117/A)
VIN = 0V
—
0.8
1.8
mA
Analog Common Voltage
25kΩ Between Common
2.4
3.05
3.35
V
(With Respect to Positive Supply)
and Positive Supply
Temperature Coefficient of Analog Common
(With Respect to Positive Supply)
"C" Device: 0°C to +70°C
TC7116A/TC7117A
TC7116/TC7117
—
—
20
80
50
—
ppm/°C
ppm/°C
TC7116/A/7117/A-7 9/17/99
© 2001 Microchip Technology Inc. DS21457A
2
3-1/2 Digit Analog-To-Digital
Convereters with Hold
TC7116
TC7116A
TC7117
TC7117A
ELECTRICAL CHARACTERISTICS (Cont.)
Parameter
Test Conditions
Min
Typ
Max
Unit
TC7116/TC7116A ONLY Peak-to-Peak
Segment Drive Voltage
V+ to V– = 9V
(Note 5)
4
5
6
V
TC7116/TC7116A ONLY Peak-to-Peak
Backplane Drive Voltage
V+ to V– = 9V
(Note 5)
V+ = 5V
Segment Voltage = 3V
V+ = 5V
Segment Voltage = 3V
4
5
5
8
6
V
TC7117/TC7117A ONLY Segment
Sinking Current (Except Pin 19)
—
—
mA
mA
TC7117/TC7117A ONLY Segment
Sinking Current (Pin 19 Only)
10
16
NOTES: 1. Input voltages may exceed supply voltages, provided input current is limited to ±100µA.
2. Dissipation rating assumes device is mounted with all leads soldered to printed circuit board.
3. Unless otherwise noted, specifications apply at TA = +25°C, fCLOCK = 48kHz. TC7116/TC7116A and TC7117/TC7117A are tested in the
circuit of Figure 1.
4. Refer to "Differential Input" discussion.
5. Backplane drive is inphase with segment drive for “OFF” segment, 180° out-of-phase for “ON” segment. Frequency is 20 times conver-
sion rate. Average DC component is less than 50mV.
6. The TC7116/TC7116A logic inputs have an internal pulldown resistor connected from HLDR, pin 1 to TEST, pin 37.
The TC7117/TC7117A logic inputs have an internal pulldown resistor connected from HLDR, pin 1 to GND, pin 21.
© 2001 Microchip Technology Inc. DS21457A
3
TC7116/A/7117/A-7 9/17/99
3-1/2 Digit Analog-To-Digital
Convereters with Hold
TC7116
TC7116A
TC7117
TC7117A
PIN CONFIGURATIONS
HLDR
40 OSC
1
2
HLDR
40 OSC
1
2
1
2
3
1
2
3
D
1
39
OSC
D
1
39
38
37
36
35
34
33
32
31
30
29
28
27
26
25
24
23
22
21
OSC
OSC
C
1
38
3
C
1
OSC
3
B
1
37
36
35
34
33
32
31
30
29
28
27
26
25
24
23
22
21
4
TEST
B
1
4
TEST
+
REF
+
REF
A
5
1's
V
A
1
5
1's
V
1
F
1
6
V+
F
1
6
V+
+
+
G
1
C
C
7
G
1
C
7
REF
–
REF
–
REF
E
1
8
E
1
C
8
REF
TC7116IPL
TC7116AIPL
TC7117CPL
TC7117ACPL
(PDIP)
TC7116IJL
TC7116AIJL
TC7117IJL
TC7117AIJL
(CerDIP)
9
D
2
COMMON
9
D
2
COMMON
+
+
10
11
12
13
14
15
16
17
18
19
20
C
2
V
10
11
12
13
14
15
16
17
18
19
20
C
2
V
IN
IN
–
–
B
2
V
B
2
V
IN
IN
10's
10's
A
2
C
AZ
A
2
C
AZ
F
2
V
BUFF
F
2
V
BUFF
E
2
V
E
2
V
INT
INT
–
–
D
3
V
D
3
V
B
3
G
2
B
3
G
2
100's
100's
F
3
C
3
F
3
C
3
100's
100's
A
E
3
A
E
3
3
3
3
3
AB
G
1000's
AB
4
G
1000's
4
POL
(MINUS SIGN)
BP/GND
POL
(MINUS SIGN)
BP/GND
(TC7116/7117)
(TC7116A/TC7117A)
(TC7116/7117)
(TC7116A/TC7117A)
6
5
4
3
2
1
44 43 42 41 40
44 43 42 41 40 39 38 37 36 35 34
33
32
31
30
29
28
27
26
25
24
23
+
1
2
3
4
NC
NC
NC
F
G
E
7
8
39
38
37
36
35
34
33
32
31
30
29
V
1
1
1
+
G
2
C
C
REF
–
C
3
TEST
9
REF
A
3
OSC
3
D
C
10
COMMON
IN HI
NC
2
2
G
3
BP/
GND
NC
5
6
11
12
13
14
15
16
17
TC7116CKW
TC7116ACKW
TC7117CKW
TC7117ACKW
TC7116CLW
TC7116ACLW
TC7117CLW
TC7117ACLW
(PLCC)
OSC
2
NC
POL
7
OSC
1
B
2
IN LO
A/Z
(FLAT PACKAGE)
8
AB
4
HLDR
A
2
D
1
E
3
9
F
2
BUFF
INT
F
3
10
11
C
1
E
2
B
3
–
B
1
D
3
V
25 26 27 28
12 13 14 15 16 17 18 19 20 21 22
18 19 20 21 22 23 24
NOTES:
1. NC = No internal connection.
+
2. Pins 9, 25, 40, and 56 are connected to the die substrate. The potential at these pins is approximately V . No external connections
should be made.
TC7116/A/7117/A-7 9/17/99
© 2001 Microchip Technology Inc. DS21457A
4
3-1/2 Digit Analog-To-Digital
Convereters with Hold
TC7116
TC7116A
TC7117
TC7117A
PIN DESCRIPTION
Pin No.
40-Pin PDIP/
40-Pin CerDIP
Normal
Pin No.
44-Pin
Plastic Quad
Flat Package
Symbol
Description
1
2
8
HLDR
D1
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.
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.
9
3
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
C1
4
B1
5
A1
6
F1
7
G1
E1
8
9
D2
10
11
12
13
14
15
16
17
18
19
20
21
C2
B2
A2
F2
E2
D3
B3
F3
E3
AB4
POL
BP
GND
LCD backplane drive output (TC7116/TC7116A).
Digital ground (TC7117/TC7117A).
22
23
24
25
26
27
29
30
31
32
34
35
G3
A3
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.
C3
G2
V–
VINT
Integrator output. Connection point for integration
capacitor. See Integration Capacitor section for
additional details.
28
29
36
37
VBUFF
Integration resistor connection. Use a 4 kΩ resistor for
200mV full-scale range and a 47kΩ resistor for 2V
full-scale range.
CAZ
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 Auto-Zero
Capacitor paragraph for more details.
30
31
32
38
39
40
VI–N
V+IN
The analog LOW input is connected to this pin.
The analog HIGH input is connected to this pin.
COMMON
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.
© 2001 Microchip Technology Inc. DS21457A
5
TC7116/A/7117/A-7 9/17/99
3-1/2 Digit Analog-To-Digital
Convereters with Hold
TC7116
TC7116A
TC7117
TC7117A
PIN DESCRIPTION (Cont.)
Pin No.
40-Pin CerDIP
40-Pin PDIP
Normal
Pin No.
44-Pin
Plastic Quad
Flat Package
Symbol
Description
33
34
41
42
C–REF
C+REF
See pin 34.
A 0.1µF capacitor is used in most applications. If a
large, common-modevoltageexists (e.g., the VI–N pin is
not at analog common), and a 200mV scale is used, a 1
µF capacitor is recommended and will hold the roll-over
error to 0.5 count.
35
36
43
44
V+
V+REF
Positive power supply voltage.
The analog input required to generate a full-scale output
(1999 counts). Place 100mV between pins 32 and 36 for
199.9mV full scale. Place 1V between pins 32 and 36
for 2V full scale. See paragraph on Reference Voltage.
37
3
TEST
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 externally-
generated decimal points. See Test paragraph for more
details.
38
39
40
4
6
7
OSC3
OSC2
OSC1
See pin 40.
See pin 40.
Pins 40, 39 and 38 make up the oscillator section. For
a 48kHz clock (3 readings per sec), connect pin 40 to
the junction of a100kΩ resistor and a 100pF capacitor.
The 100kΩ resistor is tied to pin 39 and the 100pF
capacitor is tied to pin 38.
TC7116/A/7117/A-7 9/17/99
© 2001 Microchip Technology Inc. DS21457A
6
3-1/2 Digit Analog-To-Digital
Convereters with Hold
TC7116
TC7116A
TC7117
TC7117A
C
C
AZ
INT
R
C
INT
V
REF
+
REF
+
AUTO-
ZERO
–
+
C
+
V
V
C
V
BUFF
INT
REF
REF
34
36
33
28
35
29
27
V
–
INTEGRATOR
A/Z
10 µA
+
–
LOW
+
31
+
IN
TEMP
DRIFT
+
TO
DIGITAL
V
DE
(–)
DE
(+)
INT
A/Z
SECTION
ZENER
A/Z
V
–
REF
COMPARATOR
+
DE (+)
TC7116
TC7116A
TC7117
32
30
DE (–)
ANALOG
COMMON
+
V
–3V
A/Z & DE (±)
TC7117A
–
V
IN
26
INT
–
V
Figure 3. Analog Section of TC7116/TC7116A and TC7117/TC7117A
ANALOG SECTION
(All Pin designations refers to 40-Pin DIP)
Reference Integrate Phase
The final phase is reference integrate, or deintegrate.
Input low is internally connected to analog common and
input high is connected across the previously charged
reference capacitor. Circuitry within the chip ensures that
the capacitor will be connected with the correct polarity to
cause the integrator output to return to zero. The time
required for the output to return to zero is proportional to
the input signal. The digital reading displayed is:
Figure 3 shows the block diagram of the analog section
for the TC7116/TC7116A and TC7117/TC7117A. Each
measurement cycle is divided into three phases: (1) auto-
zero (A-Z), (2) signal integrate (INT), and (3) reference
integrate (REF) or deintegrate (DE).
Auto-Zero Phase
High and low inputs are disconnected from the pins
and internally shorted to analog common. The reference
capacitor is charged to the reference voltage. A feedback
loop is closed around the system to charge the auto-zero
capacitor (CAZ) to compensate for offset voltages in the
buffer amplifier, integrator, and comparator. Since the com-
parator is included in the loop, A-Z accuracy is limited only
by system noise. The offset referred to the input is less
than 10µV.
VIN
1000 ×
.
VREF
Reference
The positive reference voltage (V+REF) is referred to
analog common.
Differential Input
This input can accept differential voltages anywhere
within the common-mode range of the input amplifier or,
specifically, from 1V below the positive supply to 1V above
the negative supply. In this range, the system has a CMRR
of 86 dB, typical. However, since the integrator also swings
with the common-mode voltage, care must be exercised to
ensure that the integrator output does not saturate. A
worst- case condition would be a large, positive common-
mode voltage with a near full-scale negative differential
input voltage. The negative-input signal drives the integra-
tor positive when most of its swing has been used up by the
positive common-mode voltage. For these critical applica-
Signal-Integrate Phase
The auto-zero loop is opened, the internal short is
removed, and the internal high and low inputs are con-
nected to the external pins. The converter then integrates
the differential voltages between V+IN and VI–N for a fixed
time. This differential voltage can be within a wide com-
mon-mode range; 1V of either supply. However, if the input
signal has no return with respect to the converter power
supply, VI–N can be tied to analog common to establish the
correct common-mode voltage. At the end of this phase,
the polarity of the integrated signal is determined.
© 2001 Microchip Technology Inc. DS21457A
7
TC7116/A/7117/A-7 9/17/99
3-1/2 Digit Analog-To-Digital
Convereters with Hold
TC7116
TC7116A
TC7117
TC7117A
+
V
+
+
V
V
+
V
4049
6.8 kΩ
TC7116
TC7116A
TC7116
TC7116A
TC7117
TO LCD
BP
DECIMAL
POINT
21
37
TC9491CZM
Ω
20k
TC7117A
+
V
GND
REF
TEST
1.2V
REF
TO LCD
BACK-
PLANE
COMMON
Figure 5. Simple Inverter for Fixed Decimal Point
Figure 4. Using an External Reference
tions, the integrator swing can be reduced to less than the
recommended 2V full-scale swing with little loss of accu-
racy. The integrator output can swing within 0.3V of either
supply without loss of linearity.
+
V
+
V
BP
TO LCD
DECIMAL
POINTS
DECIMAL
POINT
SELECT
TC7116
TC7116A
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.
Thisisselectedtogiveaminimumend-of-lifebatteryvoltage
of about 6V. However, analog common has some attributes
ofareferencevoltage. Whenthetotalsupplyvoltageislarge
enough to cause the zener to regulate (>7V), the analog
commonvoltagewillhavealowvoltagecoefficient(0.001%/
%), low output impedance ( 15Ω), and a temperature coef-
ficient of less than 20 ppm/°C, typically, and 50 ppm maxi-
mum. The TC7116/TC7117 temperature coefficients are
typically 80 ppm/°C.
4030
GND
TEST
Figure 6. Exclusive “OR” Gate for Decimal Point Drive
TC7116/TC7116A
TC7117/TC7117A
TO
COUNTER
40
39
38
CRYSTAL
An external reference may be used, if necessary, as
shown in Figure 4.
EXT
OSC
Analog common is also used as VI–N return during auto-
zeroanddeintegrate.IfVI–Nisdifferentfromanalogcommon,
a common-mode voltage exists in the system and is taken
care of by the excellent CMRR of the converter. However, in
some applications, VI–N will be set at a fixed, known voltage
(power supply common for instance). In this application,
analog common should be tied to the same point, thus
removing the common-mode voltage from the converter.
The same holds true for the reference voltage; if it can be
conveniently referenced to analog common, it should be.
Thisremovesthecommon-modevoltagefromthereference
system.
RC NETWORK
TO TEST PIN ON TC7116/TC7116A
TO GROUND PIN ON TC7117/TC7117A
Figure 7. Clock Circuits
to pull the analog common line positive). However, there is
only 10µA of source current, so analog common may easily
be tied to a more negative voltage, thus overriding the
internal reference.
Test
Within the IC, analog common is tied to an N-channel
FET that can sink 30mA or more of current to hold the
voltage 3V below the positive supply (when a load is trying
The TEST pin serves two functions. On the TC7117/
TC7117A, it is coupled to the internally-generated digital
supply through a 500Ω resistor. Thus, it can be used as a
TC7116/A/7117/A-7 9/17/99
© 2001 Microchip Technology Inc. DS21457A
8
3-1/2 Digit Analog-To-Digital
Convereters with Hold
TC7116
TC7116A
TC7117
TC7117A
voltage is switched. The BP frequency is the clock fre-
quency ꢀ 800. For 3 readings per second, this is a 60-Hz
square wave with a nominal amplitude of 5V. The seg-
ments are driven at the same frequency and amplitude,
and are inphase with BP when OFF, but out-of-phase
when ON. In all cases, negligible DC voltage exists across
the segments.
Figure 9 is the digital section of the TC7117/TC7117A.
It is identical to the TC7116/TC7116A, except that the
regulated supply and BP drive have been eliminated, and
the segment drive is typically 8 mA. The 1000's output (pin
19) sinks current from two LED segments, and has a 16-mA
drive capability. The TC7117/TC7117A are designed to
drive common anode LED displays.
negative supply for externally-generated segment drivers,
such as decimal points or any other presentation the user
may want to include on the LCD. (Figures 5 and 6 show
such an application.) No more than a 1mA load should be
applied.
The second function is a "lamp test." When TEST is
pulled HIGH (to V+), all segments will be turned ON and
the display should read –1888. The TEST pin will sink
about 10 mA under these conditions.
DIGITAL SECTION
Figures 8 and 9 show the digital section for TC7116/
TC7116A and TC7117/TC7117A, respectively. For the
TC7116/TC7116A (Figure 8), an internal digital 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)
In both devices, the polarity indication is ON for analog
inputs. If V–IN and V+IN are reversed, this indication can be
reversed also, if desired.
TC7116
TC7116A
BACKPLANE
21
LCD PHASE DRIVER
TYPICAL SEGMENT OUTPUT
+
V
7-SEGMENT
DECODE
7-SEGMENT
DECODE
7-SEGMENT
DECODE
÷
200
0.5mA
SEGMENT
OUTPUT
LATCH
TENS
2mA
INTERNAL DIGITAL GROUND
THOUSANDS
UNITS
HUNDREDS
TO SWITCH DRIVERS
FROM COMPARATOR OUTPUT
35
37
+
V
ꢁ70kΩ
CLOCK
6.2V
÷
4
LOGIC CONTROL
TEST
V
500Ω
TH = 1V
26
–
INTERNAL DIGITAL GROUND
V
40
OSC
39
OSC
38
OSC
1
HLDR
1
2
3
Figure 8. TC7116/TC7116A Digital Section
© 2001 Microchip Technology Inc. DS21457A
9
TC7116/A/7117/A-7 9/17/99
3-1/2 Digit Analog-To-Digital
Convereters with Hold
TC7116
TC7116A
TC7117
TC7117A
System Timing
To achieve maximum rejection of 60-Hz pickup, the
signal-integrate cycle should be a multiple of 60Hz. Oscilla-
tor frequencies of 240kHz, 120kHz, 80kHz, 60kHz, 48kHz,
40kHz, etc. should be selected. For 50Hz rejection, oscilla-
tor frequencies of 200kHz, 100kHz, 66-2/3kHz, 50kHz,
40kHz,etc.wouldbesuitable.Notethat40kHz(2.5readings
per second) will reject both 50Hz and 60Hz.
The clocking method used for the TC7116/TC7116A
and TC7117/TC7117A is shown in Figure 9. Three clocking
methods may be used:
(1) An external oscillator connected to pin 40.
(2) A crystal between pins 39 and 40.
(3) An RC network using all three pins.
HOLD Reading Input
The oscillator frequency is ꢀꢀ before it clocks the
decade counters. It is then further divided to form the three
convert-cycle phases: signal integrate (1000 counts), refer-
ence deintegrate (0 to 2000 counts), and auto-zero (1000 to
3000 counts). For signals less than full scale, auto-zero gets
the unused portion of reference deintegrate. This makes a
complete measure cycle of 4000 (16,000 clock pulses)
independent of input voltage. For 3 readings per second, an
oscillator frequency of 48kHz would be used.
When HLDR is at a 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 continu-
ouslyupdatethedisplay,connecttotest(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).
TC7117
TC7117A
TYPICAL SEGMENT OUTPUT
+
V
7-SEGMENT
DECODE
7-SEGMENT
DECODE
7-SEGMENT
DECODE
0.5mA
TO
SEGMENT
8mA
LATCH
TENS
DIGITAL GROUND
UNITS
HUNDREDS
THOUSANDS
TO SWITCH DRIVERS
+
FROM COMPARATOR OUTPUT
V
35
37
+
V
CLOCK
TEST
÷
4
CONTROL LOGIC
Ω
500
21
DIGITAL
GND
~70kΩ
40
OSC
39
2
38
OSC
1
OSC
HLDR
1
3
Figure 9. TC7117/TC7117A Digital Section
TC7116/A/7117/A-7 9/17/99
© 2001 Microchip Technology Inc. DS21457A
10
3-1/2 Digit Analog-To-Digital
Convereters with Hold
TC7116
TC7116A
TC7117
TC7117A
COMPONENT VALUE SELECTION
Auto-Zero Capacitor
Reference Voltage
To generate full-scale output (2000 counts), the analog
input requirement is VIN = 2 VREF. Thus, for the 200mV and
2V scale, VREF should equal 100mV and 1V, respectively. In
many applications, where the ADC is connected to a trans-
ducer, 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 700mV. Instead of dividing
the input down to 200 mV, the designer should use the input
voltage directly and select VREF = 350mV. Suitable values
for integrating resistor and capacitor would be 120kΩ and
0.22µF. This makes the system slightly quieter and also
avoidsadividernetworkontheinput.TheTC7117/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 andVI–N.
The size of the auto-zero capacitor has some influ-
ence on system noise. For 200mV full scale, where noise
is very important, a 0.47µF capacitor is recommended. On
the 2V scale, a 0.047µF capacitor increases the speed of
recovery from overload and is adequate for noise on this
scale.
Reference Capacitor
A 0.1µF 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, 1µFwillholdtheroll-overerrorto0.5count
in this instance.
Integrating Capacitor
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 ±5V supplies and analog com-
mon tied to supply ground, a ±3.5V to ±4V swing is nominal.
For 3 readings per second (48kHz clock), nominal values
for CINT are 0.22µ1F and 0.10µF, 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.
TC7117/TC7117A POWER SUPPLIES
The TC7117/TC7117A are designed to operate from
±5Vsupplies. However, ifanegativesupplyisnotavailable,
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.
Integrating Resistor
+5V
Both the buffer amplifier and the integrator have a class
A output stage with 100µA of quiescent current. They can
supply 20µA 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, 470kΩ is near
optimum and, similarly, 47kΩ for 200mV full scale.
35
+
36
+
V
V
REF
TC04
LED
DRIVE
32
31
COM
+
TC7117
TC7117A
+
V
IN
V
IN
30
21
–
V
8
IN
–
2
4
Oscillator Components
– GND
+
V
TC7660
10µF
For all frequency ranges, a 100kΩ resistor is recom-
26
5 (–5V)
mended; the capacitor is selected from the equation:
45
3
+
.
f =
RC
10µF
For a 48 kHz clock (3 readings per second), C = 100pF.
Figure 10. Negative Power Supply Generation With TC7660
© 2001 Microchip Technology Inc. DS21457A
11
TC7116/A/7117/A-7 9/17/99
3-1/2 Digit Analog-To-Digital
Convereters with Hold
TC7116
TC7116A
TC7117
TC7117A
TYPICAL APPLICATIONS
SET V
REF
100kΩ
= 100mV
+
V
40
39
38
37
36
35
34
33
32
31
30
29
28
27
26
25
24
23
22
21
40
TO
100pF
LOGIC
35
V
TO
LOGIC
GND
CC
22kΩ
1MΩ
TC7116
TC7116A
0.1pF
1kΩ
+
IN
0.01µF
TC7116
TC7116A
+
0.47µF
–
–
47kΩ
26
21
V
9V
O/R
U/R
–
0.22µF
20
TO DISPLAY
TO BACKPLANE
CD4023
OR 74C10
CD4077
O/R = OVERRANGE
U/R = UNDERRANGE
Figure 11. TC7116/TC7116A Using the Internal Reference
(200mV Full Scale, 3 Readings Per Second (RPS)
Figure 13. Circuit for Developing Underrange and Overrange
Signals from TC7116/TC7116A Outputs
SET V
REF
Ω
= 100mV
40
39
38
37
36
35
34
33
32
31
30
29
28
27
26
25
24
23
22
21
100k
40
100k
Ω
39
38
37
36
35
34
33
32
SET V
REF
= 100 mV
100pF
100pF
22kΩ
10k
Ω
10kΩ
+5V
+
V
1k
Ω
0.1pF
1k
Ω
TC9491CZM
1M
0.01µF
47k
Ω
0.1pF
+
+
1.2V
0.01µF
IN
IN
31
30
29
28
27
26
25
24
23
22
21
1MΩ
TC7117
TC7117A
0.47µF
–
TC7117
TC7117A
0.47µF
–
Ω
47k
Ω
0.22µF
0.22µF
–
–5V
V
TO DISPLAY
TO DISPLAY
Figure 12. TC7117/TC7117A Internal Reference (200mV Full Scale,
3 RPS, VI–N Tied to GND for Single-Ended Inputs.)
Figure 14. TC7117/TC7117A With a 1.2V External Band-Gap
Reference (VI–N Tied to Common)
TC7116/A/7117/A-7 9/17/99
© 2001 Microchip Technology Inc. DS21457A
12
3-1/2 Digit Analog-To-Digital
Convereters with Hold
TC7116
TC7116A
TC7117
TC7117A
SET V
REF
= 1V
40
39
38
37
36
35
34
33
32
31
30
29
28
27
26
25
24
23
22
21
40
39
38
37
36
35
34
33
32
31
30
29
28
27
26
25
24
23
22
21
100kΩ
100kΩ
SET V
REF
= 100mV
100pF
100pF
10kΩ
10kΩ
24kΩ
+
+
V
V
1kΩ
TC9491CZM
0.1pF
0.1µF
25kΩ
+
1.2V
0.01µF
Ω
1M
0.01µF
470kΩ
+
IN
1MΩ
IN
TC7117
TC7117A
TC7116
TC7116A
TC7117
0.47µF
–
0.047µF
–
47kΩ
TC7117A
0.22µF
0.22µF
–
V
TO DISPLAY
TO DISPLAY
Figure 15. Recommended Component Values for 2V Full Scale
(TC7116/TC7116A and TC7117/TC7117A)
Figure 16. TC7117/TC7117A Operated from Single +5V Supply
(An External Reference Must Be Used in This
Application.)
APPLICATIONS INFORMATION
The TC7117/TC7117A sink the LED display current,
causing heat to build up in the IC package. If the internal
voltage reference is used, the changing chip temperature
can cause the display to change reading. By reducing the
LED common anode voltage, the TC7117/TC7117A pack-
age power dissipation is reduced.
Figure 17 is a curve-tracer display showing the relation-
ship between output current and output voltage for typical
TC7117CPL/TC7117ACPL devices. Since a typical LED
has 1.8V across it at 8mA and its common anode is con-
nectedto+5V,theTC7117/TC7117Aoutputisat3.2V(Point
A, Figure 17). Maximum power dissipation is 8.1mA × 3.2V
× 24 segments = 622mW.
are ON) to Point C of Figure 17. When segments turn off, the
output voltage will increase. The diode, however, will result
in a relatively steady output voltage, around Point B.
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 segments (a “111” display)
to worst case (a “1888” display), the resistor circuit will
changeabout230mW, whileacircuitwithouttheresistorwill
change about 470mW. Therefore, the resistor will reduce
the effect of display dissipation on reference voltage drift by
about 50%.
However, notice that once the TC7117/TC7117A's out-
put voltage is above 2V, the LED current is essentially
constant as output voltage increases. Reducing the output
voltage by 0.7V (Point B Figure 17) results in 7.7mA of LED
current, only a 5% reduction. Maximum power dissipation is
now only 7.7mA × 2.5V × 24 = 462mW, a reduction of 26%.
An output voltage reduction of 1V (Point C) reduces LED
current by 10% (7.3mA), but power dissipation by 38%
(7.3mA × 2.2V × 24 = 385mW).
The change in LED brightness caused by the resistor is
almost unnoticeable as more segments turn off. If display
brightness remaining steady is very important to the de-
signer, a diode may be used instead of the resistor.
Reduced power dissipation is very easy to obtain.
Figure 18 shows two ways: Either a 5.1Ω, 1/4W resistor, or
a 1A diode placed in series with the display (but not in series
with the TC7117/TC7117A). The resistor reduces the
TC7117/TC7117A's output voltage (when all 24 segments
© 2001 Microchip Technology Inc. DS21457A
13
TC7116/A/7117/A-7 9/17/99
3-1/2 Digit Analog-To-Digital
Convereters with Hold
TC7116
TC7116A
TC7117
TC7117A
IN
–5V
+5V
+
–
1MΩ
TP3
24kΩ
1kΩ
150kΩ
0.47
µF
0.22
µF
100
pF
0.01
µF
TP5
TP2
TP1
0.1
µF
DISPLAY
100
kΩ
47
kΩ
40
1
35
30
TP
4
21
TC7117
TC7117A
10
20
DISPLAY
1.5Ω, 1/4W
1N4001
Figure 17. TC7117/TC7117A Output Current vs. Output Voltage
Figure 18. Diode or Resistor Limits Package Power Dissipation
TC7116/A/7117/A-7 9/17/99
© 2001 Microchip Technology Inc. DS21457A
14
3-1/2 Digit Analog-To-Digital
Convereters with Hold
TC7116
TC7116A
TC7117
TC7117A
PACKAGE DIMENSIONS (Cont.)
40-Pin PDIP
PIN 1
.555 (14.10)
.530 (13.46)
2.065 (52.45)
2.027 (51.49)
.610 (15.49)
.590 (14.99)
.200 (5.08)
.140 (3.56)
.040 (1.02)
.020 (0.51)
.015 (0.38)
.008 (0.20)
.150 (3.81)
.115 (2.92)
3° MIN.
.700 (17.78)
.610 (15.50)
.110 (2.79)
.090 (2.29)
.070 (1.78)
.045 (1.14)
.022 (0.56)
.015 (0.38)
40-Pin CDIP
PIN 1
.540 (13.72)
.510 (12.95)
.098 (2.49) MAX.
.030 (0.76) MIN.
2.070 (52.58)
2.030 (51.56)
.620 (15.75)
.590 (15.00)
.060 (1.52)
.020 (0.51)
.210 (5.33)
.170 (4.32)
.015 (0.38)
.008 (0.20)
3° MIN.
.150 (3.81)
MIN.
.200 (5.08)
.125 (3.18)
.700 (17.78)
.620 (15.75)
.020 (0.51)
.016 (0.41)
.110 (2.79)
.090 (2.29)
.065 (1.65)
.045 (1.14)
Dimensions: inches (mm)
© 2001 Microchip Technology Inc. DS21457A
15
TC7116/A/7117/A-7 9/17/99
3-1/2 Digit Analog-To-Digital
Convereters with Hold
TC7116
TC7116A
TC7117
TC7117A
PACKAGE DIMENSIONS (Cont.)
44-Pin PLCC
PIN 1
.021 (0.53)
.013 (0.33)
.050 (1.27) TYP.
.695 (17.65)
.685 (17.40)
.630 (16.00)
.591 (15.00)
.656 (16.66)
.650 (16.51)
.032 (0.81)
.026 (0.66)
.020 (0.51) MIN.
.656 (16.66)
.650 (16.51)
.120 (3.05)
.090 (2.29)
.695 (17.65)
.685 (17.40)
.180 (4.57)
.165 (4.19)
44-Pin PQFP
7° MAX.
.009 (0.23)
.005 (0.13)
PIN 1
.041 (1.03)
.026 (0.65)
.018 (0.45)
.012 (0.30)
.398 (10.10)
.390 (9.90)
.557 (14.15)
.537 (13.65)
.031 (0.80) TYP.
.010 (0.25) TYP.
.398 (10.10)
.390 (9.90)
.083 (2.10)
.075 (1.90)
.557 (14.15)
.537 (13.65)
.096 (2.45) MAX.
Dimensions: inches (mm)
TC7116/A/7117/A-7 9/17/99
© 2001 Microchip Technology Inc. DS21457A
16
3-1/2 Digit Analog-To-Digital
Convereters with Hold
TC7116
TC7116A
TC7117
TC7117A
TAPE & REEL DIMENSIONS
Component Taping Orientation for 44-Pin PLCC Devices
User Direction of Feed
User Direction of Feed
PIN 1
W
PIN 1
P
Standard Reel Component Orientation
for TR Suffix Device
Reverse Reel Component Orientation
for RT Suffix Device
Carrier Tape, Number of Components Per Reel and Reel Size
Package
Carrier Width (W)
Pitch (P)
Part Per Full Reel
Reel Size
44-Pin PLCC
32 mm
24 mm
500
13 in
NOTE: Drawing does not represent total number of pins.
Component Taping Orientation for 44-Pin PQFP Devices
User Direction of Feed
User Direction of Feed
PIN 1
W
PIN 1
P
Standard Reel Component Orientation
for TR Suffix Device
Reverse Reel Component Orientation
for RT Suffix Device
Carrier Tape, Number of Components Per Reel and Reel Size
Package
Carrier Width (W)
Pitch (P)
Part Per Full Reel
Reel Size
44-Pin PQFP
24 mm
16 mm
500
13 in
NOTE: Drawing does not represent total number of pins.
© 2001 Microchip Technology Inc. DS21457A
17
TC7116/A/7117/A-7 9/17/99
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ERVICE
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223 Hing Fong Road
Kwai Fong, N.T., Hong Kong
Tel: 852-2401-1200 Fax: 852-2401-3431
Tel: 978-371-6400 Fax: 978-371-0050
Chicago
333 Pierce Road, Suite 180
Itasca, IL 60143
Tel: 630-285-0071 Fax: 630-285-0075
Dallas
4570 Westgrove Drive, Suite 160
Addison, TX 75001
Tel: 972-818-7423 Fax: 972-818-2924
Batiment A - ler Etage
91300 Massy, France
Tel: 33-1-69-53-63-20 Fax: 33-1-69-30-90-79
Germany
Arizona Microchip Technology GmbH
Gustav-Heinemann Ring 125
D-81739 Munich, Germany
India
Microchip Technology Inc.
India Liaison Office
Divyasree Chambers
Tel: 49-89-627-144 0 Fax: 49-89-627-144-44
1 Floor, Wing A (A3/A4)
No. 11, OíShaugnessey Road
Bangalore, 560 025, India
Tel: 91-80-2290061 Fax: 91-80-2290062
Dayton
Germany
Analog Product Sales
Lochhamer Strasse 13
D-82152 Martinsried, Germany
Tel: 49-89-895650-0 Fax: 49-89-895650-22
Two Prestige Place, Suite 130
Miamisburg, OH 45342
Tel: 937-291-1654 Fax: 937-291-9175
Japan
Detroit
Tri-Atria Office Building
32255 Northwestern Highway, Suite 190
Farmington Hills, MI 48334
Tel: 248-538-2250 Fax: 248-538-2260
Microchip Technology Intl. Inc.
Benex S-1 6F
Italy
Arizona Microchip Technology SRL
Centro Direzionale Colleoni
Palazzo Taurus 1 V. Le Colleoni 1
20041 Agrate Brianza
3-18-20, Shinyokohama
Kohoku-Ku, Yokohama-shi
Kanagawa, 222-0033, Japan
Tel: 81-45-471- 6166 Fax: 81-45-471-6122
Los Angeles
18201 Von Karman, Suite 1090
Irvine, CA 92612
Milan, Italy
Tel: 39-039-65791-1 Fax: 39-039-6899883
Korea
Microchip Technology Korea
168-1, Youngbo Bldg. 3 Floor
Samsung-Dong, Kangnam-Ku
Seoul, Korea
Tel: 949-263-1888 Fax: 949-263-1338
United Kingdom
Arizona Microchip Technology Ltd.
505 Eskdale Road
Winnersh Triangle
Wokingham
Mountain View
Analog Product Sales
1300 Terra Bella Avenue
Mountain View, CA 94043-1836
Tel: 650-968-9241 Fax: 650-967-1590
Tel: 82-2-554-7200 Fax: 82-2-558-5934
Berkshire, England RG41 5TU
Tel: 44 118 921 5869 Fax: 44-118 921-5820
01/09/01
All rights reserved.
©
2001 Microchip Technology Incorporated. Printed in the USA. 1/01
Printed on recycled paper.
Information contained in this publication regarding device applications and the like is intended through suggestion only and may be superseded by
updates. It is your responsibility to ensure that your application meets with your specifications. No representation or warranty is given and no liability is
assumed by Microchip Technology Incorporated with respect to the accuracy or use of such information, or infringement of patents or other intellectual
property rights arising from such use or otherwise. Use of Microchipís products as critical components in life support systems is not authorized except with
express written approval by Microchip. No licenses are conveyed, implicitly or otherwise, except as maybe explicitly expressed herein, under any intellec-
tual property rights. The Microchip logo and name are registered trademarks of Microchip Technology Inc. in the U.S.A. and other countries. All rights
reserved. All other trademarks mentioned herein are the property of their respective companies.
TC7116/A/7117/A-7 9/17/99
© 2001 Microchip Technology Inc. DS21457A
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