TC7129
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 (V+ to V-)....................................... 15V
Reference Voltage (REF HI or REF LO) ......... V+ to V-
Input Voltage (IN HI or IN LO)
(Note 1)...........
V+ to V-
V
DISP
.......................................... V+ to (DGND – 0.3V)
Digital Input (Pins 1, 2, 19, 20,
21, 22, 27, 37, 39, 40) .......................... DGND to V+
Analog Input (Pins 25, 29, 30) ........................ V+ to V-
Package Power Dissipation (T
A
≤
70°C)
Plastic DIP ..................................................... 1.23W
PLCC ............................................................. 1.23W
Plastic QFP .................................................... 1.00W
Operating Temperature Range ............... 0°C to +70°C
Storage Temperature Range .............. -65°C to +150°C
TC7129 ELECTRICAL SPECIFICATIONS
Electrical Characteristics:
V+ to V- = 9V, V
REF
= 1V, T
A
= +25°C, f
CLK
= 120kHz, unless otherwise indicated.
Pin numbers refer to 40-pin DIP.
Symbol
Input
Zero Input Reading
Zero Reading Drift
Ratiometric Reading
Range Change Accuracy
RE
NL
CMRR
CMVR
e
N
I
IN
Rollover Error
Linearity Error
Common Mode Rejection Ratio
Common Mode Voltage Range
Noise (Peak-to-Peak Value not
Exceeded 95% of Time)
Input Leakage Current
Scale Factor Temperature Coefficient
Power
V
COM
Common Voltage
Common Sink Current
Common Source Current
DGND
Digital Ground Voltage
Sink Current
Supply Voltage Range
I
S
Supply Current Excluding Common
Current
2.8
—
—
4.5
—
6
—
3.2
0.6
10
5.3
1.2
9
0.8
3.5
—
—
5.8
—
12
1.3
V
mA
µA
V
mA
V
mA
V+ to Pin 28
∆Common
= +0.1V
∆Common
= -0.1V
V+ to Pin 36, V+ to V- = 9V
∆DGND
= +0.5V
V+ to V-
V+ to V- = 9V
-0000
—
9997
0.9999
—
—
—
—
—
—
—
—
0000
±0.5
9999
1.0000
1
1
110
(V-) + 1.5
(V+) – 1
14
1
2
+0000
—
10000
1.0001
2
—
—
—
—
—
10
7
Counts
µV/°C
Counts
Ratio
Counts
Counts
dB
V
V
µV
P-P
pA
ppm/°C
V
IN
= 0V, 200mV Scale
V
IN
= 0V, 0°C < T
A
< +70°C
V
IN
= V
REF
= 1000mV, Range = 2V
V
IN
= 1V on High Range,
V
IN
= 0.1V on Low Range
V
IN
- = V
IN
+ = 199mV
200mV Scale
V
CM
= 1V, V
IN
= 0V, 200mV Scale
V
IN
= 0V
200mV Scale
V
IN
= 0V
200mV Scale
V
IN
= 0V, Pins 32, 33
V
IN
= 199mV, 0°C < T
A
< +70°C
External V
REF
= 0ppm/°C
Parameter
Min
Typ
Max
Unit
Test Conditions
Note 1:
Input voltages may exceed supply voltages, provided input current is limited to ±400µA. Currents above this value may
result in invalid display readings, but will not destroy the device if limited to ±1mA. Dissipation ratings assume device is
mounted with all leads soldered to printed circuit board.
2002 Microchip Technology Inc.
DS21459B-page 3
©
MICROCHIP [ MICROCHIP TECHNOLOGY ]
