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TMS320F241FN Datasheet(PDF) 57 Page - Texas Instruments

Part # TMS320F241FN
Description  DSP CONTROLLER
PDF  66 Pages
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Manufacturer  TI [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI - Texas Instruments

TMS320F241FN Datasheet(HTML) 57 Page - Texas Instruments

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TMS320C242
DSP CONTROLLER
SPRS063B – DECEMBER 1997 – REVISED DECEMBER 1999
57
POST OFFICE BOX 1443
• HOUSTON, TEXAS 77251–1443
operating characteristics over recommended operating condition ranges†
PARAMETER
DESCRIPTION
MIN
MAX
UNIT
V5 5 V
Converting
10
mA
ICCA
Analog supply current
VCCA = 5.5 V
Non-converting
2
mA
ICCA
Analog supply current
VCCA = VREFHI = 5.5 V
PLL or OSC power
down
1
mA
C
Analog inp t capacitance
Typical capacitive load on
Non-sampling
10
pF
Cai
Analog input capacitance
Ty ical ca acitive load on
analog input pin
Sampling
30
pF
EDNL
Differential nonlinearity error
Difference between the actual step width and the ideal
value
"2
LSB
EINL
Integral nonlinearity error
Maximum deviation from the best straight line through
the ADC transfer characteristics, excluding the
quantizationerror
"2
LSB
td(PU)
Delay time, power-up to ADC valid
Time to stabilize analog stage after power-up
10
ms
ZAI
Analog input source impedance
Analog input source impedance for conversions to
remain within specifications
10
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
R1
Requiv
VAI
(to ADCINx input)
R1 = 10
Ω typical
Figure 31. Typical ADC Input Pin Circuit



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