Maxim MX7705 Manuel d'utilisateur

General DescriptionThe MX7705 low-power, 2-channel, serial-output ana-log-to-digital converter (ADC) includes a sigma-deltamodulator with a digital fi

MX770516-Bit, Low-Power, 2-Channel, Sigma-Delta ADC10 ______________________________________________________________________________________Table 3. O

MX770516-Bit, Low-Power, 2-Channel, Sigma-Delta ADC______________________________________________________________________________________ 11Table 4. P

MX770516-Bit, Low-Power, 2-Channel, Sigma-Delta ADC12 ______________________________________________________________________________________5.155.054.

MX770516-Bit, Low-Power, 2-Channel, Sigma-Delta ADC______________________________________________________________________________________13SUPPLY CURR

MX770516-Bit, Low-Power, 2-Channel, Sigma-Delta ADC14 ______________________________________________________________________________________SUPPLY CUR

MX770516-Bit, Low-Power, 2-Channel, Sigma-Delta ADC______________________________________________________________________________________15POWER-DOWN

MX770516-Bit, Low-Power, 2-Channel, Sigma-Delta ADC16 ______________________________________________________________________________________Pin Descri

Detailed DescriptionThe MX7705 low-power, 2-channel, serial-output ADCuses a sigma-delta modulator with a digital filter toachieve 16-bit resolution w

MX7705To minimize gain errors in unbuffered mode, select asource impedance less than the maximum valuesshown in Figures 2 and 3. These are the maximum

Increasing the gain increases the resolution of the ADC(LSB size decreases), but reduces the differential inputvoltage range. Calculate 1 LSB in unipo

MX770516-Bit, Low-Power, 2-Channel, Sigma-Delta ADC2 _______________________________________________________________________________________ABSOLUTE M

MX7705ModulatorThe MX7705 performs analog-to-digital conversionsusing a single-bit, 2nd-order, switched-capacitor,sigma-delta modulator. The sigma-del

External OscillatorThe oscillator requires time to stabilize when enabled.Startup time for the oscillator depends on supply voltage,temperature, load

MX7705Communications RegisterThe byte-wide communications register is bidirectionalso it can be written and read. The byte written to thecommunication

ZERO: (Default = 0) Zero Bit. This is a read-only bit.Values written to this bit are ignored.CLKDIS: (Default = 0) Clock-Disable Bit. Set CLKDIS =1 to

MX7705Set CLK = 0 for optimal performance if the externalclock frequency is 1MHz with CLKDIV = 0 or 2MHz withCLKDIV = 1.FS1, FS0: (Default = 0, 1) Fil

Test RegisterThis register is reserved for factory testing of the device.For proper operation of the MX7705, do not change thisregister from its defau

MX7705ResetDrive RESET low to reset the MX7705 to power-on resetstatus. DRDY goes high and all communication to theMX7705 is ignored while RESET is l

MX770516-Bit, Low-Power, 2-Channel, Sigma-Delta ADC______________________________________________________________________________________ 27POLL DRDYO

MX7705Using FSYNCWhen FSYNC = 1, the digital filter and analog modula-tor are in a reset state, inhibiting normal operation. SetFSYNC = 0 to begin cal

Next, an internally generated voltage (VREF / GAIN) isapplied across AIN+ and AIN-. This condition results inthe full-scale calibration.Start self-cal

MX770516-Bit, Low-Power, 2-Channel, Sigma-Delta ADC_______________________________________________________________________________________ 3ELECTRICAL

MX7705Applications InformationApplications ExamplesStrain-Gauge MeasurementConnect the differential inputs of the MX7705 to thebridge network of the s

DefinitionsIntegral NonlinearityIntegral nonlinearity (INL) is the deviation of the valueson an actual transfer function from a straight line. Thisstr

MX770516-Bit, Low-Power, 2-Channel, Sigma-Delta ADC32 ______________________________________________________________________________________Package In

MX770516-Bit, Low-Power, 2-Channel, Sigma-Delta ADCMaxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied

MX770516-Bit, Low-Power, 2-Channel, Sigma-Delta ADC4 _______________________________________________________________________________________PARAMETER

MX770516-Bit, Low-Power, 2-Channel, Sigma-Delta ADC_______________________________________________________________________________________ 5PARAMETER

MX770516-Bit, Low-Power, 2-Channel, Sigma-Delta ADC6 _______________________________________________________________________________________TIMING CHA

MX7705Note 1: These errors are in the order of the conversion noise shown in Tables 1 and 3. This applies after calibration at the giventemperature.No

MX770516-Bit, Low-Power, 2-Channel, Sigma-Delta ADC8 _______________________________________________________________________________________Table 1. O

MX770516-Bit, Low-Power, 2-Channel, Sigma-Delta ADC_______________________________________________________________________________________ 9Table 2. P