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ADS7812P Datasheet(PDF) 8 Page - Burr-Brown (TI) |
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ADS7812P Datasheet(HTML) 8 Page - Burr-Brown (TI) |
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8 / 17 page  8 ® ADS7812 Convert Convert Acquire Acquire MODE BUSY CONV t 3 t 2 t 1 t 5 t 4 t 7 t 6 t 8 t 10 t 11 t 9 FIGURE 2. Basic Conversion Timing. SYMBOL DESCRIPTION MIN TYP MAX UNITS t1 Conversion Plus Acquisition Time 25 µs t2 CONV LOW to All Digital 8 µs Inputs Stable t3 CONV LOW to Initiate a Conversion 40 ns t4 BUSY Rising to Any Digital 0 ns Input Active t5 CONV HIGH Prior to Start 2 µs of Conversion t6 BUSY LOW 15 20 µs t7 CONV LOW to BUSY LOW 85 120 ns t8 Aperture Delay 40 ns t9 Conversion Time 14 20 µs t10 Conversion Complete to 1.1 2 µs BUSY Rising t11 Acquisition Time 5 µs t12 CONV LOW to Rising Edge 1.4 µs of First DATACLK t13 Internal DATACLK HIGH 250 350 500 ns t14 Internal DATACLK LOW 600 760 875 ns t15 Internal DATACLK Period 1.1 µs t16 DATA Valid to Internal 20 ns DATACLK Rising t17 Internal DATACLK Falling 400 ns to DATA Not Valid t18 Falling Edge of Last DATACLK 800 ns to BUSY Rising t19 External DATACLK Rising 15 ns to DATA Not Valid t20 External DATACLK Rising 55 85 ns to DATA Valid t21 External DATACLK HIGH 50 ns t22 External DATACLK LOW 50 ns t23 External DATACLK Period 100 ns t24 CONV LOW to External 120 ns DATACLK Active t25 External DATACLK LOW 2 µs or CS HIGH to BUSY Rising t26 CS LOW to Digital Outputs Enabled 85 ns t27 CS HIGH to Digital Outputs Disabled 85 ns TABLE II. ADS7812 Timing. TA = –40°C to +85°C. STARTING A CONVERSION If a conversion is not currently in progress, a falling edge on the CONV input places the sample and hold into the hold mode and begins a conversion, as shown in Figure 2 and with the timing given in Table II. During the conversion, the CONV input is ignored. Starting a conversion does not depend on the state of CS. A conversion can be started once every 25 µs (40kHz maximum conversion rate). There is no minimum conversion rate. Even though the CONV input is ignored while a conversion is in progress, this input should be held static during the conversion period. Transitions on this digital input can easily couple into sensitive analog portions of the converter, adversely affecting the conversion results (see the Sensitiv- ity to External Digital Signals section of this data sheet for more information). Ideally, the CONV input should go LOW and remain LOW throughout the conversion. It should return HIGH sometime after BUSY goes HIGH. In addition, it should be HIGH prior to the start of the next conversion for a minimum time period given by t5. This will ensure that the digital transition on the CONV input will not affect the signal that is acquired for the next conversion. An acceptable alternative is to return the CONV input HIGH as soon as possible after the start of the conversion. For example, a negative going pulse 100ns wide would make a good CONV input signal. It is strongly recommended that from time t 2 after the start of a conversion until BUSY rises, the CONV input should be held static (either HIGH or LOW). During this time, the converter is more sensitive to external noise. |
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Similar Description - ADS7812P |
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