By Frank Ohnhäuser
This booklet deals scholars and people new to the subject of analog-to-digital converters (ADCs) a huge advent, sooner than going into information of the cutting-edge layout concepts for SAR and DS converters, together with the most recent examine issues, that are priceless for IC layout engineers in addition to clients of ADCs in purposes. The booklet then addresses very important themes, similar to right connectivity of ADCs in an software, the verification, characterization and checking out of ADCs that make certain top quality finish products.
Analog-to-digital converters are the imperative point in any info processing approach and law loops equivalent to modems or electric motor drives. They considerably impact the functionality and backbone of a process or finish product. approach improvement engineers must be conversant in the functionality parameters of the converters and comprehend the benefits and downsides of a few of the architectures. built-in circuit improvement engineers need to conquer the matter of accomplishing excessive functionality and backbone with the bottom attainable strength dissipation, whereas the electronic circuitry generates distortion in provide, flooring and substrate. This publication explains the connections and offers feedback for acquiring the top attainable solution. Novel tendencies are illustrated within the layout of analog-to-digital converters in keeping with successive approximation and the problems within the improvement of continuous-time delta-sigma modulators also are discussed.
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Additional resources for Analog-Digital Converters for Industrial Applications Including an Introduction to Digital-Analog Converters
Using the encoder, a high resolution can already be achieved by counting the pulses and only for the additional resolution the analog to digital converter is used. 3 ADCs Used in Industrial Applications 41 Resolver Sine output Carrier signal Stationary signal coils Cosine output Rotating carrier coil Fig. g. g. 128 Carrier signal to resolver PWM Trigger Fig. 40 Digitizing a resolver output using a delta-sigma ADC and a dual digital filter  ADC. As the system noise is usually high, a 12 bit converter is typically used together with oversampling to reach a 13 or 14 bit resolution for the angle.
37. An analog output would be the consequence. This fact is actually utilized in some commercial products such as the HCPL-7840 from Avago  or the AMC1200 from Texas Instruments . These products transmit a differential voltage through an isolation barrier of several hundreds of volts. Every converter technology has its unique advantages and is suited for special applications. The next chapter will introduce some industrial applications and will show the usage of the above ADC architectures in the application.
2 % of the measured value over a wide power range. 2 meter might have the current ranges from 100 mA to 15 A. 1 %, because of additional errors in the system such as the voltage measurement. Furthermore, the error of the current measurement is produced from the current sensor and the digitizer or in other words the analog-to-digital converter. The fullscale range of the current measurement unit above is 15 A. The 100 mA range still 44 1 Introduction a) Phase b) Phase Iph Ain3 Iph Vph Ain2 Ain1 Internal ADC Ain3 ISO ADC Vph Ain2 Ain1 VDD VSS1 VDD1 VDD2 VSS2 Din1 Din2 Din3 V DD MicroVSS Controller VSS MicroController In In Neutral Neutral Fig.
Analog-Digital Converters for Industrial Applications Including an Introduction to Digital-Analog Converters by Frank Ohnhäuser