(PDF) UC3704 Datasheet PDF | Unitrode





UC3704 Datasheet PDF

Part Number UC3704
Description Bridge Transducer Switch
Manufacture Unitrode
Total Page 4 Pages
PDF Download Download UC3704 Datasheet PDF

Features: Datasheet pdf UC3704 Bridge Transducer Switch FEATUR ES • Dual Matched Current Sources • High-gain Differential Sensing Circuit • Wide Common-mode Input Capability • Complementary Digital Open-collecto r Outputs • Externally Programmable Time Delay • Optional Output Latch wi th Reset • Built-in Diagnostic Activa tion • Wide Supply Voltage Range • High Current Heater Power Source Driver UC3704 COMPATIBLE SENSORS SENSOR TYP E Temperature Pressure Thermistor X Sensistor X Thermocouple X Semicon ductor X X Photo Voltaic Photo Resist ive Strain Gage X Piezoelectric X Magneto Resistive Inductive Hall Effe ct Capacitive BLOCK DIAGRAM DESCRIPT ION This integrated circuit contains a complete signal conditioning system to interface low-level variable impedance transducers to a digital system. A pair of matched, temperature-compensated cu rrent sources are provided for balanced transducer excitation followed by a pr ecision, high-gain comparator. The output of this comparator can be delayed by a .

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UC3704 datasheet
UC3704
Bridge Transducer Switch
FEATURES
Dual Matched Current Sources
High-gain Differential Sensing Circuit
Wide Common-mode Input Capability
Complementary Digital Open-collector
Outputs
Externally Programmable Time Delay
Optional Output Latch with Reset
Built-in Diagnostic Activation
Wide Supply Voltage Range
High Current Heater Power Source Driver
UC3704 COMPATIBLE SENSORS
SENSOR TYPE
Temperature Pressure
Thermistor
X
Sensistor
X
Thermocouple
X
Semiconductor X X
Photo Voltaic
Photo Resistive
Strain Gage
X
Piezoelectric
X
Magneto Resistive
Inductive
Hall Effect
Capacitive
BLOCK DIAGRAM
DESCRIPTION
This integrated circuit contains a complete signal conditioning sys-
tem to interface low-level variable impedance transducers to a
digital system. A pair of matched, temperature-compensated cur-
rent sources are provided for balanced transducer excitation fol-
lowed by a precision, high-gain comparator. The output of this
comparator can be delayed by a user-selectable duration, after
which a second comparator will switch complementary outputs
separately activated for diagnostic operation and has an optional
latch with external reset capability. An added feature is a high cur-
rent power source useful as a heater driver in differential tempera-
ture sensing applications. The UC3704 is designed for 0°C to
+70°C environments.
ACTIVATION SOURCE
Force
Position Displacement
Velocity
X
X
X
XXX
XXX
XXXX
X XX
XX
XXX
XX
Shock
X
X
X
X
6/93

UC3704 datasheet
ABSOLUTE MAXIMUM RATINGS
Supply Voltage (+VIN). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40V
Output Current (each output) . . . . . . . . . . . . . . . . . . . . . . 50 mA
Buffer Power Source Current . . . . . . . . . . . . . . . . . . . . . 200mA
Comparator 1 Inputs. . . . . . . . . . . . . . . . . . . . . . . -0.5V to VREF
Comparator 2 Inputs. . . . . . . . . . . . . . . . . . . . . . . . . . . 0 to 5.5V
Remote Activation and Reset Inputs . . . . . . . . . . . . . . 0 to 5.5V
Power Dissipation at TA = 25°C . . . . . . . . . . . . . . . . . . 1000mW
Operating Junction Temperature . . . . . . . . . . . -55°C to +150°C
Storage Temperature Range . . . . . . . . . . . . . . -65°C to +150°C
Lead Temperature (Soldering, 10 Seconds) . . . . . . . . . +300°C
Note: Unless otherwise specified, all voltages are with respect
to ground (Pin 1).
Currents are positive into, negative out of the specified
terminal.
Consult Packaging section of Databook for thermal
imitations and considerations of package.
CONNECTION DIAGRAM
DIL-16 (TOP VIEW)
J or N Package
UC3704
ELECTRICAL CHARACTERISTICS: Unless otherwise stated, these specifications apply for TA = 0°C to +70°C for the
UC3704: VIH = 15V, TA =TJ.
PARAMETERS
Power Inputs
Supply Voltage Range
Supply Current
Reference Section (with respect to VIN)
VREF Value |VIN - VREF|
VREF Temperature Coefficient
Line Regulation
Load Regulation
Short Circuit Current
Current Source (Q1 and Q2)
Output Current (Note 2)
Output Offset Current
Comparator One
Input Offset Voltage
Input Bias Current
Input Offset Current
CMRR
Voltage gain
Delay Current Source
Output Rise Time
TEST CONDITIONS
VIN = 36V
TJ = 25°C
Note 1
VIN = 4.2 to 25V
IO = 0 to 4mA
VIN = 36V, VREF = VIN or Ground
Current Set = 10µA
Current Set = 200µA
RE6 = RE8 = 20k
VCM = 0 to 12V
RL>150k
Overdrive = 10mV, CD = 15pF, TJ = 20°C
MIN TYP MAX UNITS
4.2 36 V
5 10 mA
2.1 2.2 2.3 V
-1 -2 -3 mV/°C
2 10 mV
2 10 mV
±25 mA
-9
-180
-9.5
-195
0
-10
-200
±1
µA
µA
µA
±1 ±4 mV
-100 -300 nA
±60 nA
60 70
dB
70 85
dB
34 40 52 µA
2 V/µs
2




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