TC7116/A/TC7117/A
3-1/2 Digit Analog-to-Digital Converters with Hold
Features:
• 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
• 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
• Convenient 9V Battery Operation:
(TC7116/TC7116A)
• High-Impedance CMOS Differential Inputs: 10
12
Ω
• Low-Power Operation: 10mW
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 back-
plane 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 refer-
ence low input (V
REF
-) is not available, as it is with the
TC7106/7107. V
REF
- is tied internally to analog
common 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
12
Ω
input imped-
ance. The 15μV
P-P
noise performance enables a “rock
solid” reading. The auto-zero cycle ensures 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.
Applications:
• Thermometry
• Bridge Readouts: Strain Gauges, Load Cells,
Null Detectors
• Digital Meters: Voltage/Current/Ohms/Power, pH
• Digital Scales, Process Monitors
• Portable Instrumentation
Device Selection Table
Package Code
CPL
IJL
CKW
CLW
Package
40-Pin PDIP
40-Pin CERDIP
44-Pin PQFP
44-Pin PLCC
Temperature Range
0°C to +70°C
-25°C to +85°C
0°C to +70°C
0°C to +70°C
©
2006 Microchip Technology Inc.
DS21457C-page 1
TC7116/A/TC7117/A
Package Type
40-Pin PDIP
HLDR 1
D
1
2
C
1
3
1's
B
1
4
A
1
5
F
1
6
G
1
7
E
1
8
40 OSC1
39 OSC2
38 OSC3
37 TEST
36 V
REF
+
35 V+
34 C
REF
+
33 C
REF
-
32 COMMON
31 V
IN
+
30 V
IN
-
29 C
AZ
28 V
BUFF
27 V
INT
26 V-
25 G
2
24 C
3
23 A
3
22 G
3
21 BP/GND
(TC7116/7117)
(TC7116A/TC7117A)
100's
100's
1000's
10's
1's
HLDR 1
D
1
2
C
1
3
B
1
4
A
1
5
F
1
6
G
1
7
E
1
8
D
2
9
40-Pin CERDIP
40 OSC1
39 OSC2
38 OSC3
37 TEST
36 V
REF
+
35 V+
34 C
REF
+
33 C
REF
-
10's
TC7116CPL
D
2
9
TC7116ACPL
C
2
10
TC7117CPL
B
2
11
TC7117ACPL
A
2
12
F
2
13
E
2
14
D
3
15
B
3
16
F
3
17
E
3
18
AB
4
19
TC7116IJL
32 COMMON
C
2
10
TC7116AIJL
31 V
IN
+
TC7117IJL
B
2
11
30 V
IN
-
TC7117AIJL
A
2
12
29 C
AZ
F
2
13
E
2
14
D
3
15
B
3
16
F
3
17
E
3
18
AB
4
19
28 V
BUFF
27 V
INT
26 V-
25 G
2
24 C
3
23 A
3
22 G
3
21 BP/GND
(TC7116/7117)
(TC7116A/TC7117A)
100's
100's
1000's
POL 20
(Minus Sign)
POL 20
(Minus Sign)
44-Pin PLCC
V
REF
+
C
REF
+
V
REF
+
44-Pin PQFP
COMMON
OSC2
OSC3
TEST
V
BUFF
C
REF
-
HLDR
OSC1
V
IN
+
NC
V
IN
-
C
1
D
1
A
1
B
1
V
INT
C
AZ
V+
6
F
1
7
G
1
8
E
1
9
D
2
10
C
2
11
NC 12
B2 13
A
2
14
F
2
15
E
2
16
D
3
17
5
4
3
2
1 44 43 42 41 40
39 V+
38 C
REF
+
37 C
REF
-
36 COMMON
35 V
IN
+
34 NC
33 V
IN
-
32 C
AZ
31 V
BUFF
30 V
INT
29 V-
NC 1
NC 2
TEST 3
44 43 42 41 40 39 38 37 36 35 34
33 NC
32 G
3
31 C
3
30 A
3
29 G
3
28 BP/
GND
27
POL
26 AB
4
25 E
3
24 F
3
23 B
3
12 13 14 15 16 17 18 19 20 21 22
A
1
G
1
E
1
D
2
C
2
B
2
A
2
E
2
D
3
F
1
F
2
OSC3
4
NC 5
TC7116CLW
TC7116ACLW
TC7117CLW
TC7117ACLW
OSC2
6
OSC1
7
HLDR 8
D
1
9
C
1
10
TC7116CKW
TC7116ACKW
TC7117CKW
TC7117ACKW
B
1
11
18 19 20 21 22 23 24 25 26 27 28
POL
NC
BP/
GND
G
3
A
3
C
3
AB
4
G
2
B
3
E
3
F
3
Note 1:
2:
NC = No internal connection.
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.
DS21457C-page 2
©
2006 Microchip Technology Inc.
V-
TC7116/A/TC7117/A
Typical Application
TC7116/A
TC7117/A
0.1μF
Display
Hold
1MΩ
+
Analog
Input
–
0.01μF
33
1
34
C
REF
+ C
REF
- HLDR
31
2–19
Segment
V
IN
+
22–25
Drive
POL
20
30 V
IN
-
Minus Sign
BP/GND
21
32
ANALOG
COMMON
V+
35
LCD Display (TC7116/7116A)
or Common Anode LED Display
(TC7117/7117A)
Backplane Drive
28
47kΩ
0.22μF
0.47μF
24kΩ
V
BUFF
36
V
REF
+
9V
29
C
AZ
V
REF
+
100mV
1kΩ
27 V
INT
V- 26
OSC2
OSC3 OSC1
39
38
C
OSC
40
R
OSC
100kΩ
To Analog
Common (Pin 32)
100pF
3 Conversions Per Second
©
2006 Microchip Technology Inc.
DS21457C-page 3
TC7116/A/TC7117/A
1.0
ELECTRICAL
CHARACTERISTICS
*Stresses above those listed under “Absolute
Maximum Ratings” may cause permanent 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 operation sections of the
specifications is not implied. Exposure to Absolute
Maximum Rating conditions for extended periods may
affect device reliability.
Absolute Maximum Ratings*
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:
TC7116/TC7116A............................... TEST to V+
TC7117/TC7117A.................................GND to V+
Package Power Dissipation; T
A
≤
70°C
(Note 2)
40-Pin CDIP ................................................2.29W
40-Pin PDIP ................................................1.23W
44-Pin PLCC ...............................................1.23W
44-Pin PQFP ...............................................1.00W
Operating Temperature:
C (Commercial) Device ................... 0°C to +70°C
I (Commercial) Device.................... 0°C to +70°C
Storage Temperature..........................-65°C to +150°C
TABLE 1-1:
TC7116/A AND TC7117/A ELECTRICAL SPECIFICATIONS
Electrical Characteristics:
Unless otherwise noted, specifications apply to both the TC7116/A and TC7117/A at T
A
= 25°C,
f
CLOCK
= 48kHz. Parts are tested in the circuit of the Typical Operating Circuit.
Symbol
Z
IR
Parameter
Zero Input Reading
Ratiometric Reading
R/O
Rollover Error (Difference in Reading
for Equal Positive and Negative
Readings Near Full Scale)
Linearity (Maximum Deviation from
Best Straight Line Fit)
CMRR
e
N
I
L
Common Mode Rejection Ratio
(Note 3)
Noise (Peak to Peak 95% of Time)
Leakage Current at Input
Zero Reading Drift
Min
—
999
-1
Typ
±0
999/1000
±0.2
Max
—
1000
+1
Unit
Test Conditions
Digital V
IN
= 0V
Reading Full Scale = 200mV
Digital V
IN
= V
REF
Reading V
REF
= 100mV
Counts
V
IN
- = + V
IN
+
≅
200mV
or
≈
2V
Full Scale = 200mV or 2V
V
CM
= ±1V, V
IN
= 0V
Full Scale = 200mV
V
IN
= 0V
Full Scale = 200mV
V
IN
= 0V
V
IN
= 0V
“C” Device = 0°C to +70°C
“I” Device = -25°C to +85°C
-1
—
—
—
—
—
±0.2
50
15
1
0.2
1.0
+1
—
—
10
1
2
Counts
μV/V
μV
pA
μV/°C
μV/°C
Note 1:
2:
3:
4:
Input voltages may exceed the supply voltages provided the input current is limited to ±100μA.
Dissipation rating assumes device is mounted with all leads soldered to printed circuit board.
Refer to “Differential Input” discussion.
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.
DS21457C-page 4
©
2006 Microchip Technology Inc.
TC7116/A/TC7117/A
TABLE 1-1:
TC7116/A AND TC7117/A ELECTRICAL SPECIFICATIONS (CONTINUED)
Electrical Characteristics:
Unless otherwise noted, specifications apply to both the TC7116/A and TC7117/A at T
A
= 25°C,
f
CLOCK
= 48kHz. Parts are tested in the circuit of the Typical Operating Circuit.
Symbol
TC
SF
Parameter
Scale Factor Temperature Coefficient
Min
—
Typ
1
Max
5
Unit
ppm/°C
Test Conditions
V
IN
= 199mV,
“C” Device = 0°C to +70°C
(Ext. Ref = 0ppm°C)
“I” Device = -25°C to +85°C
(Note 5)
TC7116/A Only
TC7117/A Only
Both
V
IN
= 0V
25kΩ Between Common
and Positive Supply
“C” Device: 0°C to +70°C
TC7116A/TC7117A
TC7116/TC7117
V+ to V- = 9V
(Note 4)
V+ to V- = 9V
(Note 4)
V+ = 5.0V
Segment Voltage = 3V
V+ = 5.0V
Segment Voltage = 3V
—
Input Resistance, Pin 1
V
IL,
Pin 1
V
IL,
Pin 1
V
IH,
Pin 1
I
DD
V
C
V
CTC
Supply Current (Does not Include LED
Current for TC7117/A)
Analog Common Voltage
(with Respect to Positive Supply)
Temperature Coefficient of Analog
Common (with Respect to Positive
Supply)
TC7116/TC7117A ONLY Peak to Peak
Segment Drive Voltage
TC7116A/TC7116A ONLY Peak to
Peak
Backplane Drive Voltage
TC7117/TC7117A ONLY
Segment Sinking Current
(Except Pin 19)
TC7117/TC7117A ONLY
Segment Sinking Current (Pin 19 Only)
Note 1:
2:
3:
4:
30
—
—
V
+
- 1.5
—
2.4
—
—
70
—
—
—
0.8
3.05
—
20
80
5
5
20
—
Test + 1.5
GND + 1.5
—
1.8
3.35
—
50
—
6
6
ppm/°C
kΩ
V
V
V
mA
V
—
ppm/°C
ppm/°C
V
V
V
SD
V
BD
4
4
5
8
—
mA
10
16
—
mA
Input voltages may exceed the supply voltages provided the input current is limited to ±100μA.
Dissipation rating assumes device is mounted with all leads soldered to printed circuit board.
Refer to “Differential Input” discussion.
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.
©
2006 Microchip Technology Inc.
DS21457C-page 5
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