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MAX5426B Datasheet(PDF) 5 Page - Maxim Integrated Products |
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MAX5426B Datasheet(HTML) 5 Page - Maxim Integrated Products |
5 / 9 page Precision Resistor Network for Programmable Instrumentation Amplifiers _______________________________________________________________________________________ 5 Detailed Description The MAX5426 is a precision resistor network with low temperature drift and high accuracy that performs the same function as a precision resistor array and CMOS switches. Operationally, this device consists of fixed resistors and digitally controlled variable resistors that provide differential gains of 1, 2, 4, and 8 (see Functional Diagram). The MAX5426 provides gains accurate to 0.025% (MAX5426A), 0.09% (MAX5426B) or 0.5% (MAX5426C). The MAX5426 is ideal for programmable instrumenta- tion amplifiers. An offset pin is available to apply a DC offset voltage to the output of the differential amplifier. Pin CM is the common-mode input voltage and can be buffered and connected to the common-mode input of the instrumentation amplifier (usually the shield of the input cable to reduce the effects of cable capacitance and leakage). Digital Interface Operation The MAX5426 features a simple two-bit parallel pro- gramming interface. D1 and D0 program the gain set- ting according to the Logic-Control Truth Table (see Table 1). The digital interface is CMOS/TTL logic com- patible. Timing Diagram Figure 3 shows the timing diagram of MAX5426 for two cases. In case 1, the differential input changes are at OUT1 and OUT2, while the voltage settling is observed at FB1 and FB2. The settling time (tSETTLE) is defined as the time for the output voltage (from the change in the input) to reach (and stay) within 0.02% of its final value. In case 2, the differential inputs (OUT1 and OUT2) are at constant voltages, while D1 and D0 are varied (for example from 01 to 10) to make a change in the gain. No op amps are used in these cases. Pin Description PIN NAME FUNCTION 1VDD Positive Power Supply. Bypass VDD to GND with a 0.1µF capacitor. 2 GND Ground 3VSS Negative Power Supply. Bypass VSS to GND with a 0.1µF capacitor. 4 FB2 First Stage Positive Input Terminal Resistor. Connect to the inverting terminal of the second input buffer (see Figure 1). 5 OUT2 First Stage Positive Output Terminal Resistor. Connect to the output terminal of the second input buffer. 6 OFFSET Second Stage Offset Terminal. Connect to a DC voltage to offset the output of the differential amplifier. 7 INDIF- Second Stage Negative Input Terminal Resistor. Connect to the inverting input terminal of the differential op amp. 8 INDIF+ Second Stage Positive Input Terminal Resistor. Connect to the noninverting input terminal of the differential op amp. 9 OUT Second Stage Output Terminal, Final Output Terminal 10 OUT1 First Stage Negative Output Terminal of Resistor. Connect to the output terminal of the first input buffer. 11 FB1 First Stage Negative Input Terminal of Resistor. Connect to the inverting input terminal of the first input buffer. 12 CM Common-Mode Voltage. CM is the input common-mode voltage of the instrumentation amplifier. Typically varies ±1% of input common-mode voltage. 13, 14 D0, D1 Digital Inputs. See Table 1. DIGITAL INPUTS D1 D0 GAIN 00 1 01 2 10 4 11 8 Table 1. Logic-Control Truth Table |
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Similar Description - MAX5426B |
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