Datasheet

 2002-2012 Microchip Technology Inc. DS21459E-page 3
TC7129
1.0 ELECTRICAL
CHARACTERISTICS
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
*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.
TC7129 ELECTRICAL SPECIFICATIONS
Electrical Characteristics: V+ to V– = 9V, V
REF
= 1V, T
A
= +25°C, f
CLK
= 120 kHz, unless otherwise indicated.
Pin numbers refer to 40-pin DIP.
Symbol Parameter Min Typ Max Unit Test Conditions
Input
Zero Input Reading –0000 0000 +0000 Counts V
IN
= 0V, 200 mV scale
Zero Reading Drift — ±0.5 — V/°C V
IN
= 0V, 0°C < T
A
< +70°C
Ratiometric Reading 9996 — 10000 Counts V
IN
= V
REF
= 1000 mV,
Range = 2V
Range Change Accuracy 0.9999 1.0000 1.0001 Ratio V
IN
= 1V on High Range,
V
IN
= 0.1V on Low Range
RE Rollover Error — 1 2 Counts V
IN
– = V
IN
+ = 199 mV
NL Linearity Error — 1 — Counts 200mV Scale
CMRR Common Mode Rejection Ratio — 110 — dB V
CM
= 1V, V
IN
= 0V,
200 mV scale
CMVR Common Mode Voltage Range — (V-) +
1.5
—VV
IN
= 0V
— (V+) – 1 — V 200 mV scale
e
N
Noise (Peak-to-Peak Value not
Exceeded 95% of Time)
— 14—V
P-P
V
IN
= 0V
200 mV scale
I
IN
Input Leakage Current — 1 10 pA V
IN
= 0V, pins 32, 33
Scale Factor Temperature
Coefficient
— 2 7 ppm/°C V
IN
= 199 mV,
0°C < T
A
< +70°C
External V
REF
= 0 ppm/°C
Note 1: Input voltages may exceed supply voltages, provided input current is limited to ±400 A. Currents above
this value may result in invalid display readings, but will not destroy the device if limited to ±1 mA.
Dissipation ratings assume device is mounted with all leads soldered to printed circuit board.