TMS320F2812 datasheet(143/170 Pages) TI

143 / 170 page

TMS320F2810, TMS320F2811, TMS320F2812

TMS320C2810, TMS320C2811, TMS320C2812

www.ti.com

SPRS174S – APRIL 2001 – REVISED MARCH 2011

6.30.2 ADC Electrical Characteristics Over Recommended Operating Conditions

Table 6-44. DC Specifications(1)

PARAMETER

MIN

TYP

MAX

UNIT

Resolution

Bits

kHz

ADC clock(2)

MHz

ACCURACY

INL (Integral nonlinearity)(3)

1–18.75 MHz ADC clock

±1.5

LSB

DNL (Differential nonlinearity)(3)

1–18.75 MHz ADC clock

±1

LSB

Offset error(4)

–80

LSB

F281x

–200

200

Overall gain error with internal reference(5)

LSB

C281x

–80

Overall gain error with external reference(6)

If ADCREFP – ADCREFM = 1 V ± 0.1%

–50

LSB

Channel-to-channel offset variation

±8

LSB

Channel-to-channel Gain variation

±8

LSB

ANALOG INPUT

Analog input voltage (ADCINx to ADCLO)(7)

ADCLO

–5

Input capacitance

Input leakage current

±5

µA

INTERNAL VOLTAGE REFERENCE(5)

Accuracy, ADCVREFP

1.9

2.1

Accuracy, ADCVREFM

0.95

1.05

Voltage difference, ADCREFP – ADCREFM

Temperature coefficient

PPM/°C

Reference noise

100

µV

EXTERNAL VOLTAGE REFERENCE(6)

Accuracy, ADCVREFP

1.9

2.1

Accuracy, ADCVREFM

0.95

1.05

Input voltage difference, ADCREFP – ADCREFM

0.99

1.01

(1)

Tested at 12.5-MHz ADCCLK.

(2)

If SYSCLKOUT

≤ 25 MHz, ADC clock ≤ SYSCLKOUT/2.

(3)

The INL degrades for frequencies beyond 18.75 MHz–25 MHz. Applications that require these sampling rates should use a 20K resistor

as bias resistor on the ADCRESEXT pin. This improves overall linearity and typical current drawn by the ADC will be a few mA more

than 24.9-k

Ω bias. The ADC module in C281x devices can operate at 24.9k bias on ADCRESEXT pin for the full range 1–25 MHz.

(4)

1 LSB has the weighted value of 3.0/4096 = 0.732 mV.

(5)

A single internal band gap reference (±5% accuracy) sources both ADCREFP and ADCREFM signals, and hence, these voltages track

together. The ADC converter uses the difference between these two as its reference. The total gain error will be the combination of the

gain error shown here and the voltage reference accuracy (ADCREFP – ADCREFM). A software-based calibration procedure is

recommended for better accuracy. See the F2810, F2811, and F2812 ADC Calibration Application Report (literature number SPRA989)

and Section 5.2, Documentation Support, for relevant documents.

(6)

In this mode, the accuracy of external reference is critical for overall gain. The voltage difference (ADCREFP – ADCREFM) will

determine the overall accuracy.

(7)

Voltages above VDDA + 0.3 V or below VSS – 0.3 V applied to an analog input pin may temporarily affect the conversion of another pin.

To avoid this, the analog inputs should be kept within these limits.

Electrical Specifications

143

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