Electronic Components Datasheet Search |
|
MAX1458 Datasheet(PDF) 4 Page - Maxim Integrated Products |
|
MAX1458 Datasheet(HTML) 4 Page - Maxim Integrated Products |
4 / 20 page _______________Detailed Description The MAX1458 provides an analog amplification path for the sensor signal. Calibration and temperature com- pensation are achieved by varying the offset and gain of a programmable-gain amplifier (PGA) and by varying the sensor bridge current. The PGA uses a switched- capacitor CMOS technology, with an input-referred coarse offset trimming range of approximately ±63mV (9mV steps). An additional output-referred fine offset trim is provided by the Offset DAC (approximately 2.8mV steps). The PGA provides eight gain values from +41V/V to +230V/V. The bridge current source is pro- grammable from 0.1mA to 2mA. The MAX1458 uses four 12-bit DACs and one 3-bit DAC, with calibration coefficients stored by the user in an internal 128-bit EEPROM. This memory contains the following information as 12-bit-wide words: • Configuration register • Offset calibration coefficient • Offset temperature error compensation coefficient • FSO (full-span output) calibration coefficient • FSO temperature error compensation coefficient • 24 user-defined bits for customer programming of manufacturing data (e.g., serial number and date) Figure 1 shows a typical pressure-sensor output and defines the offset, full-scale, and full-span output values as a function of voltage. 1%-Accurate, Digitally Trimmed Sensor Signal Conditioner 4 _______________________________________________________________________________________ NAME FUNCTION 1 SCLK Data Clock Input. Used only during programming/testing. Internally pulled to VSS with a 1MΩ (typical) resis- tor. Data is clocked in on the rising edge of the clock. The maximum SCLK frequency is 10kHz. 2 CS Chip-Select Input. The MAX1458 is selected when this pin is high. When low, OUT and DIO become high impedance. Internally pulled to VDD with a 1MΩ (typical) resistor. Leave unconnected for normal operation. PIN 3, 11 I.C. Internally Connected. Leave unconnected. 4 TEMP Temperature Sensor Output. An internal temperature sensor (a 100k Ω, 4600ppm/°C TC resistor) which can provide a temperature-dependent voltage. 8 VSS Negative Power-Supply Input 7 WE Dual-Function Input Pin. Used to enable EEPROM erase/write operations. Also used to set the DAC refresh- rate mode. Internally pulled to VDD with a 1MΩ (typical) resistor. Refer to the Chip-Select (CS) and Write- Enable (WE) section. 6 DIO Data Input/Output. Used only during programming/testing. Internally pulled to VSS with a 1MΩ (typical) resistor. High impedance when CS is low. 5 FSOTC Buffered FSOTC DAC Output. An internal 75k Ω resistor (RFTC) connects FSOTC to ISRC (see Functional Diagram). Optionally, external resistors can be used in place of or in parallel with RFTC and RISRC. 14 INP Positive Sensor Input. Input impedance >1M Ω. Rail-to-rail input range. 13 BDRIVE Sensor Excitation Current Output. This current source drives the bridge. 12 INM Negative Sensor Input. Input impedance >1M Ω. Rail-to-rail input range. 10 OUT PGA Output Voltage 9 ISRC Current-Source Reference. An internal 75k Ω resistor (RISRC) connects ISRC to VSS (see Functional Diagram). Optionally, external resistors can be used in place of or in parallel with RFTC and RISRC. Pin Description 16 LIMIT Voltage Limit Input. This pin sets the maximum voltage at OUT. If left unconnected, the output voltage will be limited to 4.6V (VDD = 5V). Connect to VDD for maximum output swing. The acceptable range is 4.5V ≤ VLIMIT ≤ VDD. 15 VDD Positive Power-Supply Input. Connect a 0.1µF capacitor from VDD to VSS. |
Similar Part No. - MAX1458 |
|
Similar Description - MAX1458 |
|
|
Link URL |
Privacy Policy |
ALLDATASHEET.COM |
Does ALLDATASHEET help your business so far? [ DONATE ] |
About Alldatasheet | Advertisement | Datasheet Upload | 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 |