Supply Voltage 5V±5% (Ratio Range) Wide Operating Temperature Range: -

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Supply Voltage 5V±5% (Ratio Range) Wide Operating Temperature Range: -

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RATIOMETRIC VOLTAGE TRANSMITTER
Supply Voltage 5V±5% (Ratio Range) Wide Operating Temperature Range: -40°C.+100°C Ratiometrical Current Source Transducer Excitation Instrumentation Amplifier Input Voltage Output Driver: VOUT 0.5-4.5V, IOUT ±5mA (Push/Pull) Adjustable Output Current Limitation Adjustable Gain, Offset, Output Voltage Range Overvoltage Switch-Off Protection Against Reverse Polarity
AM427
GENERAL DESCRIPTION
AM427 cost ratiometric voltage transmitter, designed flexible bridge signal conditioning. contains ratiometric current source transducer excitation, high accuracy instrumentation amplifier differential input signals, voltage output driver. Gain, offset, output voltage range adjustable external resistors. voltage output stage used push/pull mode. addition main blocks, there several protection functions: current limitation output driver gives short circuit protection. Also protection against reverse polarity, overvoltage switch-off provided. With functional protection blocks AM427 ideally suited automotive sensor interface applications.
APPLICATIONS
Industrial Process Control Automotive Applications Sensor Transmitter
DELIVERY
DIL16 packages (samples, small quantities) SO16(n) packages Dice blue foil
BLOCK DIAGRAM
Overvoltage Switch Reverse Polarity Protection
150mV
AM427
Output Stage
VOUT
IVIC
Figure
analog microelectronics
Analog Microelectronics GmbH Fahrt 55124 Mainz Internet: www.analogmicro.de Phone: (0)6131/91 Fax: (0)6131/91 E-Mail: info@analogmicro.de
April Rev.
RATIOMETRIC VOLTAGE TRANSMITTER
ELECTRICAL SPECIFICATIONS
Tamb 25°C, (unless otherwise noted)
Parameter Voltage Range (Ratio Range) Maximum Supply Voltage Quiescent Current Temperature Specifications Operating Storage Junction Thermal Resistance Tamb Over Voltage Switch Input Voltage Range Threshold Voltage Input Current Output Current VV+THRESH 4.75 0.87 1.35 DIL16 plastic package SO16 narrow plastic package Symbol VCCmax 500, Conditions Min. 4.75 Typ.
AM427
Max. 5.25
Unit
°C/W °C/W
Ratiometric Current Source Transducer Sense Voltage Range Internal Sense Voltage Output Current Range Output Current Ratiometric Error VVIB RAT@IB ratiometric with VIB, 500, VVIB VVIB 5.25V, RAT@IB 1.05 (VVIB (VVIB 5.25V) 1.25mA 1mA, UIB/IIB, VVIB 4.75V 5.25V, VVIB ratiometric with VIB, VVIB 0.50 0.98 1.25 1.02
Temperature Output Voltage Range Output Resistance Power Supply Rejection Ratio Instrumentation Amplifier Input Voltage Range Internal Gain Common Mode Rejection Ratio Power Supply Rejection Ratio Offset Voltage Temperature Input Bias Current Output Voltage Range Output Resistance Nonlinearity Voltage Output Stage Adjustable Gain Input Voltage Range Power Supply Rejection Ratio
dIRB/dT
VCC-0.5V
ppm/°C
VIN+;- CMRR PSRR dVOS/dT VVIA ROUT 200mV, ideal input VIN- 200mV VVIA/VIN
10.0
VCC-2V 10.2
µV/°C
VCC-2V
GOUT PSSR
VCC-2.5V
analog microelectronics
April
RATIOMETRIC VOLTAGE TRANSMITTER
Parameter Voltage Output Stage (cont.) Offset Voltage Temperature Input Current Input Current Output Voltage Range Output Current Output Current VOUT Current Limitation Threshold Output Resistance Linearity Current Source Output Internal Sense Voltage Input Sense Current Output Current Output Current Output Voltage Range VRIC IRIC IVIC IOUT VOUT with transistor BC848C with transistor BC848C, IOUT ratiometric with dVOS/dT IRSC VOUT IOUT IVOUT VTHRESH ROUT 50mV 50mV VRSC VVCC 150mV with transistor BCW68H IOUT 10mA (see figure with transistor BCW68H VOUT ratiometric with virtual ideal input 12.5 Symbol Conditions Min. Typ.
AM427
Max. Unit
±3.0 25.0 12.5 0.85 0.01
µV/°C
BOUNDARY CONDITIONS
Parameter Resistor Adjustment Current Source (Transducer) Gain Resistor Capacitor Power Supply Capacitor Frequency Compensation (Output Stage) Capacitor Load (Output Stage) Resistor Sense Current Limitation Resistor Adjustment Current Source (Output Stage) Symbol 10.0 1000 Conditions Min. Typ. Max. 1000 Unit
FUNCTIONAL DIAGRAM
COMP
(ratriometrical)
GAIN 20.110
VOUT Ground
Figure
analog microelectronics
April
RATIOMETRIC VOLTAGE TRANSMITTER
FUNCTIONAL DESCRIPTION
AM427
AM427 integrated ratiometrical voltage interface specially designed bridge input signals automotive applications. With integrated, ratiometrical current source AM427 ideally suited signal conditioning piezoresistive pressure transducers allows easy temperature compensation span adjustment these kinds sensors. addition main functional blocks provides several protection functions. integrated protection blocks are: Overvoltage Switch Off, Protection against Reverse Polarity, Short Circuit Protection (VOUT against Ground) output stage. AM427 consists basic functional blocks: Ratiometrical Current Source transducer excitation: current adjusted variation resistor following relation: VVIB
Instrumentation Amplifier Input Stage with fixed gain pre-amplifiing bridge input signal. Open Collector Output Stage with following functions: Voltage Output: output used voltage amplifier which external PNP-open collector stage which able push maximum current IOUT 11mA. gain GOUT adjustable external resistors between GOUT 2.11: GOUT
gain complete system becomes then GOUT. Current Limitation: comparator stage with fixed threshold voltage VCC-150mV provides adjustable current limitation. maximum current value 150mV
With external Schottky diode output stage short circuit protected against VOUT Ground. current limitation required connected VCC. Pull-Down Current Source: symmetrical push/pull output required, pull-down current source able give pull down load. current adjusted variation resistor
analog microelectronics
April
RATIOMETRIC VOLTAGE TRANSMITTER
AM427
current source required pins have grounded alternatively connected. Overvoltage Switch Stage with fixed threshold voltage approximately gives protection against short circuit higher supply voltage. case short circuit with board supply voltage (automobile) switch stage cuts bias current PNP-transistor electrically separated from overvoltage. overvoltage switch required pins have grounded alternatively connected. special feature AM427 provides protection against reverse polarity three connection pins VCC, OUT. These pins changed unintentionally without damaging integrated circuit. Adjustment Output Voltage Range span output voltage could adjusted gain GOUT output stage. offset output voltage adjusted same adjustment sensor offset using resistors (Figure
analog microelectronics
April
RATIOMETRIC VOLTAGE TRANSMITTER
PINOUT
NAME N.C. N.C. VOUT
AM427
DESIGNATION Sense Current Source Transducer Sense Overvoltage Protection Overvoltage Protection Ground Output Current Source Transducer Adjustment Current Source Transducer Input Positive Connected Connected Input Negative Adjustment Gain Output Stage Output Current Source Output Adjustment Current Source Output Output Stage Sense Current Limitation Supply Voltage
N.C.
VOUT N.C.
Figure
DELIVERY
AM427 available version: packages (samples) packages Dice blue foil
PACKAGE DIMENSIONS SO16
10,06 1,45 0,05 0,42 0,07 1,27 0,635 0°-10°
2,00
Figure
analog microelectronics
April
RATIOMETRIC VOLTAGE TRANSMITTER
APPLICATION WITH PROTECTION FUNCTIONS
AM427
AM427
150mV
Overvoltage Switch Reverse Polarity Protection
RTCO1
RTCO2
Output Stage
VOUT
RTCS
Ground
Figure current application features AM427 used: Overvoltage Switch Reverse Polarity Protection block connected enabled. short circuit protection adjusted resistor network transducer calibration compensation well known from literature. With given values external components (see List External Components) following application features adjusted: 75mV GOUT VOUT IOUT ±5mA (push/pull) (ratiometrical supply current pressure transducer)
analog microelectronics
April
RATIOMETRIC VOLTAGE TRANSMITTER
APPLICATION WITH BASIC FUNCTIONS
AM427
AM427
Overvoltage Switch Reverse Polarity Protection
150mV
RTCO1
RTCO2
Output Stage
VOUT
RTCS
Ground
Figure current application shows basic function AM427. protection blocks (see application above) activated. current limitation current source output used either. Only compensation pressure transducer ratiometrical system included. will find this basic functional system AM417, which reduced form AM427. With given values external components (see List External Components) following application features adjusted: 100mV GOUT VOUT 4.5V IOUT +10mA 0.25mA (ratiometrical supply current pressure transducer)
analog microelectronics
April
RATIOMETRIC VOLTAGE TRANSMITTER
LIST EXTERNAL COMPONENTS
Symbol T1*, RTCS RO1, RTCO1, RTCO2 Description BCW68H, BC557C similar) BC848C, BC548C BAT46, BAS40 IOUTmax (push) Value drop, high at10mA high drop (typ.) 10.0
AM427
Unit
Span (Gain adjustment) VOUT
IOUT (sink) typical transducer resistor span compensation Offset adjustment offset adjustment
needed basic application (Figure
TOPOLOGIE APPLICATION (with protection)
VOUT
N.C.
RTCO1
RTCO2
RTCS
AM427
N.C.
Ground
Figure
information provided herein believed reliable; however, Analog Microelectronics assumes responsibility inaccuracies omissions. Analog Microelectronics assumes responsibility this information, such information shall entirely user's risk. Prices specifications subject change without notice. patent rights licences circuits described herein implied granted third party. Analog Microelectronics does authorise warrant Analog Microelectronics product life support devices and/or systems.
analog microelectronics
April

Supply Voltage 5V±5% (Ratio Range) Wide Operating Temperature Range: -

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