4-1/2 DIGIT ANALOG-TO-DIGITAL
CONVERTER WITH ON-CHIP LCD DRIVERS
TC7129
Storage Temperature Range ................ – 65°C to +150°C
Lead Temperature (Soldering, 10 sec) ................. +300°C
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–
VDISP ................................................V+ to (DGND – 0.3V)
Digital Input, Pins
Notes: Input voltages may exceed supply voltages, provided input current
is limited to ±400 µA. 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.
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 (TA ≤ 70°C)
Plastic DIP ........................................................1.23W
PLCC ................................................................1.23W
Plastic QFP.......................................................1.00W
Operating Temperature Range .................... 0°C to +70°C
*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.
ELECTRICAL CHARACTERISTICS: V+ to V– = 9V, VREF = 1V, TA = +25°C, fCLK = 120 kHz, unless otherwise
indicated. Pin numbers refer to 40-pin DIP.
Symbol
Input
Parameter
Test Conditions
Min
Typ
Max Unit
Zero Input Reading
Zero Reading Drift
VIN = 0V, 200 mV Scale
– 0000 0000
+0000 Counts
VIN = 0V, 0°C < TA < +70°C
VIN = VREF = 1000 mV, Range = 2V
—
±0.5
—
µV/°C
Ratiometric Reading
Range Change Accuracy
9997
9999
10000 Counts
VIN = 0.1V on Low Range
0.9999 1.0000 1.0001 Ratio
ϬVIN = 1V on High Range
RE
Roll-Over Error
–VIN = +VIN = 199 mV
200 mV Scale
—
—
—
1
1
2
Counts
Counts
dB
NL
Linearity Error
—
—
CMRR
CMVR
Common-Mode Rejection Ratio
Common-Mode Voltage Range
VCM = 1V, VIN = 0V, 200 mV Scale
110
VIN = 0V
200 mV Scale
—
—
(V–) +1.5
—
—
V
V
(V+) –1
eN
IIN
Noise (Peak-to-Peak Value Not
Exceeded 95% of Time)
VIN = 0V
200 mV Scale
—
14
—
µVP-P
Input Leakage Current
VIN = 0V, Pins 32, 33
—
—
1
2
10
7
pA
Scale Factor Temperature
Coefficient
VIN = 199 mV, 0°C < TA < +70°C
ppm/°C
External VREF = 0 ppm/°C
Power
VCOM
Common Voltage
V+ to Pin 28
2.8
3.2
3.5
V
Common Sink Current
Common Source Current
∆Common = +0.1V
∆Common = –0.1V
—
—
0.6
10
—
—
mA
µA
DGND
Digital Ground Voltage
Sink Current
V+ to Pin 36, V+ to V– = 9V
∆DGND = +0.5V
V+ to V–
4.5
—
6
5.3
1.2
9
5.8
—
V
mA
V
Supply Voltage Range
Supply Current Excluding Common Current
Clock Frequency
12
IS
V+ to V– = 9V
—
—
—
6.3
0.8
120
50
1.3
360
—
mA
kHz
kΩ
V
fCLK
VDISP Resistance
VDISP to V+
V+ to V–
Low-Battery Flag Activation Voltage
7.2
7.7
Digital
Continuity Comparator
Threshold Voltages
VOUT Pin 27 = High
VOUT Pin 27 = Low
100
—
200
200
—
400
mV
mV
Pull-Down Current
Pins 37, 38, 39
—
2
10
µA
3-232
TELCOM SEMICONDUCTOR, INC.
TELCOM [ TELCOM SEMICONDUCTOR, INC ]
