AD524 |
RFQ for AD524 Required Field |
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| Technical/Catalog Information | AD5241BR10 |
| Vendor | Analog Devices Inc |
| Category | Integrated Circuits (ICs) |
| Number of Circuits | 1 - Single |
| Resistance In Ohms | 10K |
| Interface | I²C, 2-Wire Serial |
| Taps | 256 |
| Package / Case | 14-SOIC (3.9mm Width), 14-SOL |
| Packaging | Tube |
| Voltage - Supply | 2.7 V ~ 5.5 V, ±2.3 V ~ 2.7 V |
| Memory Type | Volatile |
| Temperature Coefficient | 30 ppm/°C Typical |
| Operating Temperature | -40°C ~ 105°C |
| Drawing Number | * |
| RoHS Status | RoHS Non-Compliant |
| Other Names | AD5241BR10 AD5241BR10 |
| Product | Manufacturers | Pack | D/C |
| AD524 | Analog Devices | SMD | 07/08+ |
The circuit uses a synchronous-detection scheme to measure low-level resistances. Other low-resis-tance-measuring circuits sometimes inject unacceptable large currents into the system-under-test.This circuit synchronously demodulates the voltage drop across the system-under-test and can hence use extremely low currents while measuring resistance.
The 10-V (pk), 1-kHz carrier generator injects a 1-mA reference current into unknown resistor, RTEST. Instrument amplifier IC1 and precision op amp IC2A amplify the voltage across RTEST by a gain of 100000. Synchronous detector IC3 demodulates this voltage, then op amp IC2B acts a low-pass filter on the demodulated voltage. The low-pass filtering will attenuate all uncorrelated disturbances (such as noise, drift, or offsets), while passing a dc voltage that is proportional to the unknown resistance.
The relationship between the output voltage and the unknown resistance is:
The AD524 is a precision monolithic instrumentation amplifier designed for data acquisition applications requiring high accuracy under worst-case operating conditions. An outstanding combination of high linearity, high common mode rejection, low offset voltage drift and low noise makes the AD524 suitable for use in many data acquisition systems.
The AD524 has an output offset voltage drift of less than 25 mV/ C, input offset voltage drift of less than 0.5 mV/ C, CMR above 90dB at unity gain (120 dB at G = 1000) and maximum nonlinearity of 0.003% at G = 1. In addition to the outstanding dc specifications, the AD524 also has a 25 kHz gain bandwidth product (G = 1000). To make it suitable for high speed data acquisition systems the AD524 has an output slew rate of 5 V/ms and settles in 15 ms to 0.01% for gains of 1 to 100.
As a complete amplifier the AD524 does not require any external components for fixed gains of 1, 10, 100 and 1000. For other gain settings between 1 and 1000 only a single resistor is required. The AD524 input is fully protected for both power-on and power-off fault conditions.
The AD524 IC instrumentation amplifier is available in four different versions of accuracy and operating temperature range. The economical "A" grade, the low drift "B" grade and lower drift, higher linearity "C" grade are specified from 25 C to +85 C. The "S" grade guarantees performance to specification over the extended temperature range 55 C to +125 C. Devices are available in 16-lead ceramic DIP and SOIC packages and a
20-terminal leadless chip carrier.
Features |
| Low Noise: 0.3 mV p-p 0.1 Hz to 10 HzLow Nonlinearity: 0.003% (G = 1)High CMRR: 120 dB (G = 1000)Low Offset Voltage: 50 mVLow Offset Voltage Drift: 0.5 mV/8CGain Bandwidth Product: 25 MHzPin Programmable Gains of 1, 10, 100, 1000Input Protection, Power OnPower OffNo External Components RequiredInternally CompensatedMIL-STD-883B and Chips Available16-Lead Ceramic DIP and SOIC Packages and 20-Terminal Leadless Chip Carriers AvailableAvailable in Tape and Reel in Accordance with EIA-481A StandardStandard Military Drawing Also Available |
