3-232 TELCOM SEMICONDUCTOR, INC.
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
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
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.
*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 Parameter Test Conditions Min Typ Max Unit
Input Zero Input Reading VIN = 0V, 200 mV Scale – 0000 0000 +0000 Counts
Zero Reading Drift VIN = 0V, 0°C < TA < +70°C—±0.5 — µV/°C
Ratiometric Reading VIN = VREF = 1000 mV, Range = 2V 9997 9999 10000 Counts
Range Change Accuracy VIN = 0.1V on Low Range 0.9999 1.0000 1.0001 Ratio
4VIN = 1V on High Range
RE Roll-Over Error –VIN = +V IN = 199 mV — 1 2 Counts
NL Linearity Error 200 mV Scale — 1 — Counts
CMRR Common-Mode Rejection Ratio VCM = 1V, VIN = 0V, 200 mV Scale — 110 — dB
CMVR Common-Mode Voltage Range VIN = 0V — (V–) +1.5 — V
200 mV Scale — (V+) –1 — V
eNNoise (Peak-to-Peak Value Not VIN = 0V — 14 — µVP-P
Exceeded 95% of Time) 200 mV Scale
IIN Input Leakage Current VIN = 0V, Pins 32, 33 — 1 10 pA
Scale Factor Temperature VIN = 199 mV, 0°C < TA < +70°C — 2 7 ppm/°C
Coefficient External VREF = 0 ppm/°C
Power
VCOM Common Voltage V+ to Pin 28 2.8 3.2 3.5 V
Common Sink Current ∆Common = +0.1V — 0.6 — mA
Common Source Current ∆Common = –0.1V — 10 — µA
DGND Digital Ground Voltage V+ to Pin 36, V+ to V– = 9V 4.5 5.3 5.8 V
Sink Current ∆DGND = +0.5V — 1.2 — mA
Supply Voltage Range V+ to V–6912V
I
SSupply Current Excluding Common Current V+ to V– = 9V — 0.8 1.3 mA
fCLK Clock Frequency — 120 360 kHz
VDISP Resistance VDISP to V+—50 —kΩ
Low-Battery Flag Activation Voltage V+ to V–6.3 7.2 7.7 V
Digital Continuity Comparator VOUT Pin 27 = High 100 200 — mV
Threshold Voltages VOUT Pin 27 = Low — 200 400 mV
Pull-Down Current Pins 37, 38, 39 — 2 10 µA
Storage Temperature Range ................– 65°C to +150°C
Lead Temperature (Soldering, 10 sec) .................+300°C
TC7129
4-1/2 DIGIT ANALOG-TO-DIGITAL
CONVERTER WITH ON-CHIP LCD DRIVERS