ADC performance

Adam,

Below ADC timing overview will be useful for your ADC timing calculations.

ADC Timing Overview

ADC Timing (per channel):

TDIS = TVCLK * PS * PDIS

TSAMPLE = TVCLK * PS * ACQ

TCONV = TVCLK * PS * (N+1)

TCHANNEL = TDIS + TSAMPLE + TCONV = TVCLK * PS (PDIS + ACQ + N +1)

Total ADC Timing:

TTOTAL = CHN * TCHANNEL + (CHN-1) * 5 *TVCLK

NOTE:

For the first channel of a conversion group TSCAN=0.
For each additional channel 5VCLK cycles of TSCAN have to be added.

SOC                    START OF CONVERSION

EOC                    END OF CONVERSION

TSCAN                    SCANNING TIME

TDIS                      DISCHARGING TIME

TSAMPLE                  SAMPLING TIME

TCONV                    CONVERSION TIME

TVCLK                     VCLK PERIOD

TCHANNEL                 MEASUREMENT TIME PER CHANNEL

TTOTAL                    TOTAL MEASUREMENT TIME

PS                       ADCLK PRESCALE SELECT

PDIS                     DISCHARGE CYCLES PRESCALE SELECT

ACQ                     ACQUISITION PRESCALE SELECT

N                          RESOLUTION (BITS)

CHN                     NUMBER OF CHANNELS OF SELECTED GROUP

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Now answering to your question

1. I need information about maximal useful ADC conversion time. I have to do 700ns sampling rate of 1 ms duration signal and then transmit stored  data via UART. Is it possible using 160Mhz MCU?

YES, it is possible to transmit the stored data via UART( LIN/SCI module). You can find a similar application code in "Safety Demo software" which is part of the TMS570 Microcontroller Development kit or USB kit

In your case
Max HCLK = 160MHz
Max VCLK = HCLK/2 = 80MHz ( Max VCLK supported is 100MHz)
Max ADCLK = VCLK

min PS = 1
min ACQ = 2

Hence Achievable Sampling time

TSAMPLE = VCLK * 1 * 2 = 2 * 1/80MHz = 25ns

Use the above formulas and acheive the desire conversion time.

2. Can TMS570 USB Dev. Stick work standalone after flashing via USB using CCS4.1?

YES

Best Regards
Prathap