Electronic Components Datasheet Search |
|
MAX44252ASD-T Datasheet(PDF) 11 Page - Maxim Integrated Products |
|
MAX44252ASD-T Datasheet(HTML) 11 Page - Maxim Integrated Products |
11 / 14 page 11 Maxim Integrated MAX44250/MAX44251/MAX44252 20V, Ultra-Precision, Low-Noise Op Amps ADC Buffer Amplifier The MAX44250/MAX44251/MAX44252's low input offset voltage, low noise, and fast settling time make these amplifiers ideal for ADC buffers. Weigh scales are one application that often require a low-noise, high-voltage amplifier in front of an ADC. Figure 1 details an example of a load cell and amplifier driven from the same Q10V supplies, along with the MAX11211 18-bit delta sigma ADC. Load cells produce a very small voltage change at their outputs, therefore driving the excitation source with a higher voltage produces a wider dynamic range that can be measured at the ADC inputs. The MAX11211 ADC operates from a single 2.7V to 3.6V analog supply, offers 18-bit noise-free resolution and 0.86mW power dissipation. The MAX11211 also offers > 100dB rejection at 50Hz and 60Hz. This ADC is part of a family of 16-, 18-, 20-, and 24-bit delta sigma ADCs with high precision and < 1mW power dissipation. The MAX44250/MAX44251/MAX44252's low input offset voltage and low noise allow a gain circuit prior to the MAX11211 without losing any dynamic range at the ADC. Error Budget Example When using the ICs as an ADC buffer in strain gauge application, the temperature drift should be taken into consideration to determine maximum input signal. A typical strain gauge has sensitivity specification of just 2mV/V at rated out load. This means that when the strain gauge load cell is powered with 10V, the full-scale output voltage is 20mV. In this application, both offset voltage and drift are critical parameters that directly affect the accuracy of measurement. Even though offset voltage could be calibrated out, its drift over temperature is still a problem. The ICs, with a typical offset drift of 5nV/°C, guarantee that the drift over a 10°C range is only 50nV. Setting this equal to 0.5 LSB in a 18-bit system yields a full-scale range of 13mV. With a single 10V supply, an acceptable closed-loop gain of 770V/V provides sufficient gain while maintaining headroom. Precision Low-Side Current Sensing The ICs’ autozero feature produces ultra-low offset voltage and drift, making them ideal for precision cur- rent-sensing applications. Figure 2 shows the ICs in a low-side current-sense configuration. This circuit pro- duces an accurate output voltage, VOUT equal to ILOAD x RSENSE x (1 + R2/R1). Figure 2. Low-Side Current Sensing VSUPPLY OUT ILOAD RSENSE R1 R2 MAX44251 MAX44252 |
Similar Part No. - MAX44252ASD-T |
|
Similar Description - MAX44252ASD-T |
|
|
Link URL |
Privacy Policy |
ALLDATASHEET.NET |
Does ALLDATASHEET help your business so far? [ DONATE ] |
About Alldatasheet | Advertisement | Contact us | Privacy Policy | Link Exchange | Manufacturer List All Rights Reserved©Alldatasheet.com |
Russian : Alldatasheetru.com | Korean : Alldatasheet.co.kr | Spanish : Alldatasheet.es | French : Alldatasheet.fr | Italian : Alldatasheetit.com Portuguese : Alldatasheetpt.com | Polish : Alldatasheet.pl | Vietnamese : Alldatasheet.vn Indian : Alldatasheet.in | Mexican : Alldatasheet.com.mx | British : Alldatasheet.co.uk | New Zealand : Alldatasheet.co.nz |
Family Site : ic2ic.com |
icmetro.com |