ENICSF2811PBKA datasheet(148/172 Pages) TI1

148 / 172 page

Analog Input on

Channel Ax

Analog Input on

Channel Bv

ADC Clock

Sample and Hold

SH Pulse

dschA0_n

dschB0_n

dschB0_n+1

Sample n

Sample n+1

Sample n+2

dschA0_n+1

d(SH)

ADC Event Trigger from EV

or Other Sources

SMODE Bit

TMS320F2810, TMS320F2811, TMS320F2812

TMS320C2810, TMS320C2811, TMS320C2812

SPRS174T – APRIL 2001 – REVISED MAY 2012

www.ti.com

6.30.7 Simultaneous Sampling Mode (Dual-Channel) (SMODE = 1)

In simultaneous mode, the ADC can continuously convert input signals on any one pair of channels

(A0/B0 to A7/B7). The ADC can start conversions on event triggers from the Event Managers (EVA/EVB),

software trigger, or from an external ADCSOC signal. If the SMODE bit is 1, the ADC will do conversions

on two selected channels on every Sample/Hold pulse. The conversion time and latency of the Result

Result register update. The selected channels will be sampled simultaneously at the falling edge of the

Sample/Hold pulse. The Sample/Hold pulse width can be programmed to be 1 ADC clock wide (minimum)

or 16 ADC clocks wide (maximum).

NOTE

In Simultaneous Mode, the ADCIN channel pair select has to be A0/B0, A1/B1, ..., A7/B7,

and not in other combinations (such as A1/B3, and so forth).

Figure 6-42. Simultaneous Sampling Mode Timing

Table 6-49. Simultaneous Sampling Mode Timing

AT 25-MHz

SAMPLE n

SAMPLE n + 1

ADC CLOCK,

REMARKS

tc(ADCCLK) = 40 ns

Delay time from event

td(SH)

2.5tc(ADCCLK)

trigger to sampling

Sample/Hold width/

Acqps value = 0–15

tSH

(1 + Acqps) * tc(ADCCLK)

40 ns with Acqps = 0

Acquisition Width

ADCTRL1[8:11]

Delay time for first

td(schA0_n)

result to appear in

4tc(ADCCLK)

160 ns

Result register

Delay time for first

td(schB0_n)

result to appear in

5tc(ADCCLK)

200 ns

Result register

Delay time for

successive results to

td(schA0_n+1)

(3 + Acqps) * tc(ADCCLK)

120 ns

appear in Result

Delay time for

successive results to

td(schB0_n+1)

(3 + Acqps) * tc(ADCCLK)

120 ns

appear in Result

148

Electrical Specifications

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Product Folder Link(s): TMS320F2810 TMS320F2811 TMS320F2812 TMS320C2810 TMS320C2811 TMS320C2812

ENICSF2811PBKA 数据表(PDF) 148 Page - Texas Instruments

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