Datasheet AD8210 (Analog Devices) - 10
| Manufacturer | Analog Devices |
| Description | High Voltage, Bidirectional Current Shunt Monitor |
| Pages / Page | 15 / 10 — AD8210. Data Sheet. THEORY OF OPERATION. ISHUNT. RSHUNT. VREF1. VOUT = … |
| Revision | E |
| File Format / Size | PDF / 284 Kb |
| Document Language | English |
AD8210. Data Sheet. THEORY OF OPERATION. ISHUNT. RSHUNT. VREF1. VOUT = (ISHUNT × RSHUNT) × 20. VREF2. GND
Text Version of Document
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AD8210 Data Sheet THEORY OF OPERATION
In typical applications, the AD8210 amplifies a smal differential The differential currents through Q1 and Q2 are converted input voltage generated by the load current flowing through a into a differential voltage by R3 and R4. A2 is configured as an shunt resistor. The AD8210 rejects high common-mode voltages instrumentation amplifier. The differential voltage is converted (up to 65 V) and provides a ground referenced buffered output into a single-ended output voltage by A2. The gain is internally that interfaces with an analog-to-digital converter (ADC). set with precision-trimmed, thin film resistors to 20 V/V. Figure 26 shows a simplified schematic of the AD8210. The output reference voltage is easily adjusted by the VREF1 pin The AD8210 is comprised of two main blocks, a differential and the VREF2 pin. In a typical configuration, VREF1 is connected amplifier and an instrumentation amplifier. A load current to VCC while VREF2 is connected to GND. In this case, the output flowing through the external shunt resistor produces a voltage is centered at VCC/2 when the input signal is 0 V. at the input terminals of the AD8210. The input terminals are connected to the differential amplifier (A1) by R1 and R2. A1 nul s the voltage appearing across its own input terminals by adjusting the current through R1 and R2 with Q1 and Q2. When the input signal to the AD8210 is 0 V, the currents in R1 and R2 are equal. When the differential signal is nonzero, the current increases through one of the resistors and decreases in the other. The current difference is proportional to the size and polarity of the input signal.
ISHUNT RSHUNT R1 R2 VS AD8210 A1 VREF1 Q1 Q2 VOUT = (ISHUNT × RSHUNT) × 20 A2 R3 R4 VREF2 GND
004 05147- Figure 26. Simplified Schematic Rev. E | Page 10 of 15 Document Outline FEATURES APPLICATIONS FUNCTIONAL BLOCK DIAGRAM GENERAL DESCRIPTION TABLE OF CONTENTS REVISION HISTORY SPECIFICATIONS ABSOLUTE MAXIMUM RATINGS ESD CAUTION PIN CONFIGURATION AND FUNCTION DESCRIPTIONS TYPICAL PERFORMANCE CHARACTERISTICS THEORY OF OPERATION MODES OF OPERATION UNIDIRECTIONAL OPERATION Ground Referenced Output V+ Referenced Output BIDIRECTIONAL OPERATION External Referenced Output Splitting an External Reference Splitting the Supply INPUT FILTERING APPLICATIONS INFORMATION HIGH-SIDE CURRENT SENSE WITH A LOW-SIDE SWITCH HIGH-SIDE CURRENT SENSE WITH A HIGH-SIDE SWITCH H-BRIDGE MOTOR CONTROL OUTLINE DIMENSIONS ORDERING GUIDE AUTOMOTIVE PRODUCTS
AD8210 Data Sheet THEORY OF OPERATION
In typical applications, the AD8210 amplifies a smal differential The differential currents through Q1 and Q2 are converted input voltage generated by the load current flowing through a into a differential voltage by R3 and R4. A2 is configured as an shunt resistor. The AD8210 rejects high common-mode voltages instrumentation amplifier. The differential voltage is converted (up to 65 V) and provides a ground referenced buffered output into a single-ended output voltage by A2. The gain is internally that interfaces with an analog-to-digital converter (ADC). set with precision-trimmed, thin film resistors to 20 V/V. Figure 26 shows a simplified schematic of the AD8210. The output reference voltage is easily adjusted by the VREF1 pin The AD8210 is comprised of two main blocks, a differential and the VREF2 pin. In a typical configuration, VREF1 is connected amplifier and an instrumentation amplifier. A load current to VCC while VREF2 is connected to GND. In this case, the output flowing through the external shunt resistor produces a voltage is centered at VCC/2 when the input signal is 0 V. at the input terminals of the AD8210. The input terminals are connected to the differential amplifier (A1) by R1 and R2. A1 nul s the voltage appearing across its own input terminals by adjusting the current through R1 and R2 with Q1 and Q2. When the input signal to the AD8210 is 0 V, the currents in R1 and R2 are equal. When the differential signal is nonzero, the current increases through one of the resistors and decreases in the other. The current difference is proportional to the size and polarity of the input signal.
ISHUNT RSHUNT R1 R2 VS AD8210 A1 VREF1 Q1 Q2 VOUT = (ISHUNT × RSHUNT) × 20 A2 R3 R4 VREF2 GND
004 05147- Figure 26. Simplified Schematic Rev. E | Page 10 of 15 Document Outline FEATURES APPLICATIONS FUNCTIONAL BLOCK DIAGRAM GENERAL DESCRIPTION TABLE OF CONTENTS REVISION HISTORY SPECIFICATIONS ABSOLUTE MAXIMUM RATINGS ESD CAUTION PIN CONFIGURATION AND FUNCTION DESCRIPTIONS TYPICAL PERFORMANCE CHARACTERISTICS THEORY OF OPERATION MODES OF OPERATION UNIDIRECTIONAL OPERATION Ground Referenced Output V+ Referenced Output BIDIRECTIONAL OPERATION External Referenced Output Splitting an External Reference Splitting the Supply INPUT FILTERING APPLICATIONS INFORMATION HIGH-SIDE CURRENT SENSE WITH A LOW-SIDE SWITCH HIGH-SIDE CURRENT SENSE WITH A HIGH-SIDE SWITCH H-BRIDGE MOTOR CONTROL OUTLINE DIMENSIONS ORDERING GUIDE AUTOMOTIVE PRODUCTS
