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MAX4196 Datasheet(PDF) 10 Page - Maxim Integrated Products |
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MAX4196 Datasheet(HTML) 10 Page - Maxim Integrated Products |
10 / 13 page Micropower, Single-Supply, Rail-to-Rail, Precision Instrumentation Amplifiers 10 ______________________________________________________________________________________ VCM vs. VOUT Characterization Figure 4 illustrates the MAX4194 typical common-mode input voltage range over output voltage swing at unity- gain (pins 1 and 8 left floating), with a single-supply voltage of VCC = +5V and a bias reference voltage of VREF = VCC/2 = +2.5V. Points A and D show the full input voltage range of the input amplifiers (VEE - 0.2V to VCC - 1.1V) since, with +2.5V output, there is zero input differential swing. The other points (B, C, E, and F) are determined by the input voltage range of the input amps minus the differential input amplitude necessary to produce the associated VOUT. For the higher gain configurations, the VCM range will increase at the end- points (B, C, E, and F) since a smaller differential volt- age is necessary for the given output voltage. Rail-to-Rail Output Stage The MAX4194–MAX4197’s output stage incorporates a common-source structure that maximizes the dynamic range of the instrumentation amplifier. The output can drive up to a 25k Ω (tied to VCC/2) resis- tive load and still typically swing within 30mV of the rails. With an output load of 5k Ω tied to VCC/2, the out- put voltage swings within 100mV of the rails. Shutdown Mode The MAX4195–MAX4197 feature a low-power shutdown mode. When the shutdown pin (SHDN) is pulled low, the internal amplifiers are switched off and the supply current drops to 8µA typically (Figures 5a, 5b, and 5c). This disables the instrumentation amplifier and puts its output in a high-impedance state. Pulling SHDN high enables the instrumentation amplifier. Applications Information Setting the Gain (MAX4194) The MAX4194’s gain is set by connecting a single, external gain resistor between the two RG pins (pin 1 and pin 8), and can be described as: G = 1 + 50k Ω / RG where G is the instrumentation amplifier’s gain and RG is the gain-setting resistor. The 50k Ω resistor of the gain equation is the sum of the two resistors internally connected to the feedback loops of the IN+ and IN- amplifiers. These embedded feed- back resistors are laser trimmed, and their accuracy and temperature coefficients are included in the gain and drift specification for the MAX4194. 0 1 3 2 4 5 02 1 345 OUTPUT VOLTAGE (V) B C 0.03 4.97 D A F E MAX4194/MAX4195 G = +1V/V REF = +2.5V/+1.5V VCC = +5V/+3V VEE = 0 TA = +25 °C SHDN (5V/div) MAX4195 OUT AC-COUPLED (VDIFF = 2V, G = +1V/V) (500mV/div) 50 µs/div Figure 4. Common-Mode Input Voltage vs. Output Voltage Figure 5a. MAX4195 Shutdown Mode *Leave pins 1 and 8 open for G = +1V/V. GAIN (V/V) CLOSEST RG (1%) ( Ω) CLOSEST RG (5%) ( Ω) +1 ∞ * ∞ * +2 49.9k 51k +5 12.4k 12k +10 5.62k 5.6k +20 2.61k 2.7k +50 1.02k 1.0k +100 511 510 +200 249 240 +500 100 100 +1,000 49.9 51 +2,000 24.9 24 +5,000 10 10 +10,000 4.99 5.1 Table 1. MAX4194 External Gain Resistor Selection |
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