TMS320F241FN datasheet(57/66 Pages) TI

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TMS320C242

DSP CONTROLLER

SPRS063B – DECEMBER 1997 – REVISED DECEMBER 1999

POST OFFICE BOX 1443

• HOUSTON, TEXAS 77251–1443

operating characteristics over recommended operating condition ranges†

PARAMETER

DESCRIPTION

MIN

MAX

UNIT

V5 5 V

Converting

ICCA

Analog supply current

VCCA = 5.5 V

Non-converting

ICCA

Analog supply current

VCCA = VREFHI = 5.5 V

PLL or OSC power

down

Analog inp t capacitance

Typical capacitive load on

Non-sampling

Cai

Analog input capacitance

Ty ical ca acitive load on

analog input pin

Sampling

EDNL

Differential nonlinearity error

Difference between the actual step width and the ideal

value

LSB

EINL

Integral nonlinearity error

Maximum deviation from the best straight line through

the ADC transfer characteristics, excluding the

quantizationerror

LSB

td(PU)

Delay time, power-up to ADC valid

Time to stabilize analog stage after power-up

ZAI

Analog input source impedance

Analog input source impedance for conversions to

remain within specifications

Ω

† Absoluteresolution=4.89mV.AtVREFHI=5VandVREFLO=0V,thisisoneLSB.AsVREFHIdecreases,VREFLOincreases,orboth,theLSBsize

decreases. Therefore, the absolute accuracy and differential/integral linearity errors in terms of LSBs increase.

ADC input pin circuit

One of the most common A/D application errors is inappropriate source impedance. In practice, minimum

source impedance should be used to limit the error as well as to minimize the required sampling time; however,

the source impedance must be smaller than ZAI. A typical ADC input pin circuit is shown in Figure 31.

VIN

Requiv

VAI

(to ADCINx input)

R1 = 10

Ω typical

Figure 31. Typical ADC Input Pin Circuit

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