ENICSF2811PBKA datasheet(147/172 Pages) TI1

147 / 172 page

Analog Input on

Channel Ax or Bx

ADC Clock

Sample and Hold

SH Pulse

SMODE Bit

dschx_n

dschx_n+1

Sample n

Sample n+1

Sample n+2

ADC Event Trigger from EV

or Other Sources

d(SH)

TMS320F2810, TMS320F2811, TMS320F2812

TMS320C2810, TMS320C2811, TMS320C2812

www.ti.com

SPRS174T – APRIL 2001 – REVISED MAY 2012

6.30.6 Sequential Sampling Mode (Single-Channel) (SMODE = 0)

In sequential sampling mode, the ADC can continuously convert input signals on any of the channels (Ax

to Bx). 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 0, the ADC will do conversions on the

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

update are explained below. The ADC interrupt flags are set a few SYSCLKOUT cycles after the Result

The Sample/Hold pulse width can be programmed to be 1 ADC clock wide (minimum) or 16 ADC clocks

wide (maximum).

Figure 6-41. Sequential Sampling Mode (Single-Channel) Timing

Table 6-48. Sequential 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/

Acqps value = 0–15

tSH

Hold width/

(1 + Acqps) * tc(ADCCLK)

40 ns with Acqps = 0

ADCTRL1[8:11]

Acquisition width

Delay time for first

td(schx_n)

result to appear in the

4tc(ADCCLK)

160 ns

Result register

Delay time for

successive results to

td(schx_n+1)

(2 + Acqps) * tc(ADCCLK)

80 ns

appear in the Result

Electrical Specifications

147

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

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