AM402

AM402 ANALOGMICRO | Alldatasheet

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CURRENT CONVERTER IC AM402 analog microelectronics April 99 Analog Microelectronics GmbH Phone: +49 (0)6131/91 073 – 0 1/8 An der Fahrt 13, D – 55124 Mainz Fax: +49 (0)6131/91 073 – 30 Rev. 2.1 Internet: www.analogmicro.de E–Mail: info@analogmicro .de

FEATURES

• Wide Supply Voltage Range: 6...35V
• Wide Operating Temperature Range: –40°C...+85°C
• Adjustable Reference Voltage Source: 4.5 to 10V
• Wide Common Mode Range Instru- mentation Amplifier
• Adjustable Gain and Offset
• Two–Wire Output: 4...20mA
• Three–Wire Output: 0/4...20mA
• Adjustable Output Current Range
• Protection Against Reverse Polarity
• Current Shutdown with Overvoltage
• Shutdown with Excessive Tempera- ture

APPLICATIONS

• Industrial Process Control
• Sensor Signal Converter (e.g. pressure)
• Programmable Current Source GENERAL DESCRIPTION AM402 is a monolithically integrated current converter which has been specially developed for the processing of differential bridge sig- nals. AM402 is suitable for two- and three- wire applications and has four function blocks. A high-precision instrumentation amplifier (IA) serves as an input stage. A reference volt- age source, which can be adjusted to values of between 4.5 and 10V, excites external compo- nents and a voltage-controlled current output stage converts the voltage signal. It is thus possible to generate output currents which cor- respond to the normal industrial standards DELIVERY
• DIL16 packages (samples)
• SO16(n) packages
• Dice on 5“ blue foil BLOCK DIAGRAM Reference Voltage V I Instrumentation Amplifier SET OUT RS+ RS− VREFVSETGAIN− GAIN+ IN+ VCC GAIN GND AM402 IN− 10 11 12 13 16 714 Figure 1

CURRENT CONVERTER IC AM402 analog microelectronics April 99 ELECTRICAL SPECIFICATIONS Tamb = 25°C, VCC = 24V, VREF = 5V, IREF = 1mA (unless otherwise noted) Parameter Symbol Conditions Min. Typ. Max. Unit Voltage Range VCC 63 5 V Quiescent Current ICC Tamb = – 40...+85°C, IREF = 0mA 1.5 mA Temperature Specifications Operating Tamb –40 85 °C Storage Tst –55 125 °C Junction TJ 150 °C Thermal Resistance Θja DIL16 plastic package 70 °C/W Θja SO16 narrow plastic package 140 °C/W Voltage Reference Voltage VREF VSET not connected 4.75 5.00 5.25 V VREF VSET = GND, VCC ≥ 11V 9.5 10.0 10.5 V Trim Range VR10 4.5 VR10 V Current IREF*0 1 0 m A VREF vs. Temperature d VREF/dTT amb = – 40...+85°C ±90 ±140 ppm/°C Line Regulation d VREF/dVV CC = 6V...35V 30 80 ppm/V dVREF/dV VCC = 6V...35V, IREF ≈ 5mA 60 150 ppm/V Load Regulation d VREF/dI 0.05 0.10 %/mA dVREF/dI IREF ≈ 5mA 0.06 0.15 %/mA Load Capacitance CL 1.9 2.2 5.0 µF SET Stage Internal Gain GSET 0.5 Input Voltage VSET 01 . 1 5 V Offset Voltage VOS ±0.5 ±2.5 mV VOS vs. Temperature d VOS/dT ±1.6 ±5µ V / ° C Input Bias Current IB 82 0 n A IB vs. Temperature d IB/dT 71 8 p A / ° C Instrumentation Amplifier Adjustable Gain GIA 15 Differential Input Voltage Range VIN SET = GND 0 580/ GIA mV Common Mode Input Range CMIR V CC < 9V 1.5 VCC – 3 V CMIR VCC ≥ 9V 1.5 6.0 V Common Mode Rejection Ratio CMRR 80 90 dB Power Supply Rejection Ratio PSRR 80 90 dB Offset Voltage VOS ±1 ±3m V VOS vs. Temperature d VOS/dT ±5µ V / ° C Input Bias Current IB 82 0 n A IB vs. Temperature d IB/dT 61 5 p A / ° C Input Offset Current IOS 0.2 nA IOS vs. Temperature d IOS/dT 0.8 pA/°C Output Voltage Range FS VOUTFS V OUTFS = VGAIN+ – VGAIN– 400 500 580 mV Load Capacitance CL 250 pF

CURRENT CONVERTER IC AM402 analog microelectronics April 99 Parameter Symbol Conditions Min. Typ. Max. Unit V/I Converter Internal Gain GVI 1.00 Trim Range adjustable by R0 0.75 1.00 1.25 Voltage Range at R0 FS VR0FS 400 500 580 mV Offset Voltage VOS βF ≥ 100 ±2 ±6m V VOS vs. Temperature d VOS/dT βF ≥ 100 ±7 ±20 µV/°C Output Offset Current IOUTOS 3–wire operation –35 –50 µA IOUTOS vs. Temperature d IOUTOS/dT 3–wire operation 55 80 nA/°C Output Offset Current IOUTOS 2–wire operation 14 22 µA IOUTOS vs. Temperature d IOUTOS/dT 2–wire operation 22 35 nA/°C Output Control Current IOUTC 2–wire operation, VR0/100mV 5 µA IOUTC vs. Temperature d IOUTC/dT 2–wire operation –9 nA/°C Output Voltage Range VOUT VOUT = RL IOUT, VCC < 16V 0 VCC – 6 V VOUT VOUT = RL IOUT, VCC ≥ 16V 01 0 V Output Current Range FS IOUTFS IOUT = VR0/R0, 3–wire operation 20 mA Output Resistance ROUT 0.5 1.0 MΩ Load Capacitance CL 0 500 nF Protection Functions Voltage Limitation at R0 VLIMR0 VR0 = VIN GIA, SET = GND 580 640 700 mV VLIMR0 VIN = 0, VR0 = VSET/2 580 635 690 mV Temperature Limitation TLIMIT 110 130 150 °C Protection against reverse polarity Ground vs. VS vs. IOUT 35 V Current in case of reverse polarity Ground = 35V, VS = IOUT = 0 3.8 mA System Parameters Nonlinearity ideal input 0.05 0.15 %FS * In 2–wire operation a maximum current of IOUTmin – ICC is valid Currents flowing into the IC are negative BOUNDARY CONDITIONS Parameter Symbol Conditions Min. Typ. Max. Unit Sense Resistor R0 IOUTFS = 2 0 m A 2 02 52 9 Ω R0 c = 20mA/IOUTFS c ⋅ 20 c ⋅ 25 c ⋅ 29 Ω Stabilisation Resistor R5 IOUTFS = 2 0 m A 3 54 04 5 Ω R5 c = 20mA/IOUTFS c ⋅ 35 c ⋅ 40 c ⋅ 45 Ω Load Resistance RL limitation only for 3–wire operation 0 500 Ω Sum Gain Resistors R1 + R2 25 50 kΩ Sum Offset Resistors R3 + R4 20 200 kΩ VREF Capacitance C1 1.9 2.2 5.0 µF Output Capacitance C2 only for 2–wire operation 90 100 250 nF D1 Breakdown Voltage VBR 35 50 V T1 Forward Current Gain βF 50 150

CURRENT CONVERTER IC AM402 analog microelectronics April 99 PINOUT 8 9 RS+ VCC RS N.C. OUT N.C. SET IN VREF GND VSET GAIN+ GAIN GAIN IN+ N.C. Figure 5 DELIVERY The AM402 is available in version:

• 16 pin DIL packages (samples)
• SO 16 (n) packages (maximum power dissipation PD = 300mW)
• Dice on 5“ blue foil PACKAGE DIMENSIONS SO16 (n) PIN NAME DESIGNATION

1 RS+ Sense Resistor +

2 VCC Supply Voltage

3 RS– Sense Resistor –

4 N.C. Not Connected

5 OUT Output

6 N.C. Not Connected

7 SET Set Output Current

8 IN– Input Negative

9 IN+ Input Positive

10 GAIN– Gain Adjustment

11 GAIN Gain Adjustment

12 GAIN+ Gain Adjustment

13 VSET Reference Voltage Select

14 GND IC Ground

15 N.C. Not Connected

16 VREF Reference Voltage Output

0°-10°≥ 0,3 6,2 ± 0,2 4,0 + 0,2 - 0,1 0,2 ± 0,05 1,27 ≤ 2,00 10,06 ± 0,1 1,45 ± 0,1 0,2 ± 0,1 Figure 6

CURRENT CONVERTER IC AM402 analog microelectronics April 99 TYPICAL THREE–WIRE APPLICATION (0/4–20mA) Used in a three–wire circuit, pin 2 ( VCC) is connected to pin 1 ( RS+) and ground pin 14 ( GND) is connected to Ground (Figure 7). The Gain GIA is adjusted by external resistors R1 and R2 and can be calculated by 11 2121 −=⇒+= IAIA GRRRRG Hence, the transfer–function of the output current IOUT becomes SETIAINOUT IRGVI += 0 with the current ISET adjusted by external resistors R3 and R4. I V R R RR R R V RISET REF REF SET =⋅ + ⇒= −22 1 The supply voltage must be chosen with respect to the load resistor RL described by the following equation VI RSO U T m a x L≥+ 6V Example 1: Output current range 4...20mA The values of the external devices (VIN =05 0K mV , VREF =5V , 8 =IAG ) are as follows R0 = 25Ω R1 = 33kΩ R 2 = 4.7kΩ R3 = 100kΩ Example 2: Output current range 0...20mA The values of the external devices (VIN =0 250K mV , VREF =5V , 2 =IAG ) are as follows R0 = 25Ω R1 = 22kΩ R 2 = 22kΩ R5 = 40Ω R3, R4 not used (SET = GND) RL = 0...500Ω C1 = 2.2µF 10 11 12 13 16 714 C1 R2 R1 VREF VS VIN R5 IOUT RLR3 R4 AM 402 5/10 V reference IA V I Ground Figure 7

CURRENT CONVERTER IC AM402 analog microelectronics April 99 TYPICAL TWO–WIRE APPLICATION (4–20mA) Used in a two–wire circuit, pin 2 (VCC) is connected to pin 3 ( RS–) and ground pin 14 (GND, ⊥) is connected to RL (Figure 8). The Gain GIA is adjusted by external resistors R1 and R2 and can be cal- culated by 11 2121 −=⇒+= IAIA GRRRRG Hence, the transfer–function of the output current IOUT becomes SETIAINOUT IRGVI += 0 with the current ISET adjusted by external resistors R3 and R4. I V R R RR R R V RISET REF REF SET =⋅ + ⇒= −22 1 The supply voltage must be chosen with respect to the load resistor RL described by the following equation VI RSO U T m a x L≥+ 6V Example 3: Output current range 4...20mA The values of the external devices (VIN =0 200K mV , VREF =5V , 2 =IAG ) are as follows R0 = 25Ω R1 = 22kΩ R 2 = 22kΩ R3 = 100kΩ R 4 = 0...5kΩ R5 = 40Ω RL = 0...500Ω C 1 = 2.2µF C2 = 100nF 10 11 12 13 16 714 C1 R2 R1 VREF VS VIN R5 IOUT RLR3 R4 AM 402 5/10 V reference IA V I Ground Figure 8 The information provided herein is believed to be reliable; however, Analog Microelectronics assumes no responsibility for inaccuracies or omissions. Analog Microelectronics assumes no responsibility for the use of this information, and all use of such information shall be entirely at the user's own risk. Prices and specifications are subject to change without notice. No patent rights or licences to any of the circuits described herein are implied or granted to any third party. Analog Microelectronics does not authorise or warrant any Analog Microelectronics product use in life support devices and/or systems.