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AS8510-ASSP 数据表(PDF) 13 Page - ams AG |
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AS8510-ASSP 数据表(HTML) 13 Page - ams AG |
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13 / 47 page ![]() www.ams.com/AS8510 Revision 3.5 12 - 46 AS8510 Datasheet - Electrical Character i s t ics 6.4.3 Sigma Delta Analog to Digital Converter Notes: 1. Production test at ±800mV. Maximum VIN can be 1.22V with VREF=1.225V. 2. Programmable. It is defined with respect to the first decimator in the ΣΔ ADC. 3. Programmable: Internal clock is 1024/2048 kHz; external clock max is 8192 kHz. 4. Dependent on fovs, R1 and R2. The bandwidth is calculated according to the formula: BW=fovs/(2*R1*R2); the sampling frequency at the output of the A/D converter is 2*BW. 5. Defined at maximum input signal, BW=500 Hz (1Hz to 500 Hz), fovs=1024 kHz, R1=64, fchop=2 kHz and R2=2. 6. Reference voltage might be forced from external. 6.4.4 Bandgap Reference Voltage Notes: 1. Accuracy at 65ºC. 2. No DC current is allowed from this pin. 3. This is a design parameter and not production tested. Table 17. Sigma Delta Analog to Digital Converter Symbol Parameter Conditions Min Typ Max Units VREF Reference voltage 6 1.225 V VINADC Input range 1 At Vref = 1.22V 0±1.22 V R1 Oversampling ratio/Decimation Ratio 2 64 128 128 fovs Oversampling frequency 3 1024/ 2048 kHz RES Number of bits 16 bits BW Bandwidth 4 1 500 Hz S/N Signal to noise ratio 5 90 dB Table 18. Bandgap Reference Voltage Symbol Parameter Conditions Min Typ Max Units V REFTRIM Reference Voltage after trim 1, 2 Trim at 65ºC 1.225 V VREFACC Reference Voltage Initial Accuracy 1, 2 At 65ºC ±3.5 mV VREFDRIFT Reference Voltage Temperature drift Temperature range -20 to 65 ºC ±0.4 % Temperature range -40 to 125 ºC +0.4/ -0.6 % PSRRREF PSR @ dc 80 dB SUTAVDD Start Up Time with supply ramp 3 5ms SUTPD Start Up Time from power down 3 1ms RNDVREF Output resistance of band gap 500 1000 Ω VNDVREF Bandgap reference thermal noise density 3 300 nV/ √Hz CLVREF Output Capacitor (Ceramic) 100 nF ESRVREF 0.02 1 Ω |
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