TMS320F241FN datasheet(56/66 Pages) TI

56 / 66 page

TMS320C242

DSP CONTROLLER

SPRS063B – DECEMBER 1997 – REVISED DECEMBER 1999

POST OFFICE BOX 1443

• HOUSTON, TEXAS 77251–1443

10-bit dual analog-to-digital converter (ADC)

The 10-bit ADC has a separate power bus for its analog circuitry. These pins are referred to as VCCA and VSSA.

The power bus isolation is to enhance ADC performance by preventing digital switching noise of the logic

circuitry that can be present on VSS and VCC from coupling into the ADC analog stage. All ADC specifications

are given with respect to VSSA unless otherwise noted.

Resolution

10-bit (1024 values)

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Monotonic

Assured

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Output conversion mode

000h to 3FFh (000h for VI ≤ VSSA; 3FFh for VI ≥ VCCA)

. . . . . . . . . . . . . . . . . . . . . . .

Conversion time (including sample time)

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

recommended operating conditions

MIN

NOM

MAX

UNIT

VCCA

Analog supply voltage

4.5

5.5

VSSA

Analog ground

VREFHI

Analog supply reference source†

VREFLO

VCCA

VREFLO

Analog ground reference source†

VSSA

VREFHI

VAI

Analog input voltage, ADCIN00–ADCIN07

VSSA

VCCA

† VREFHI and VREFLO must be stable, within ±1/2 LSB of the required resolution, during the entire conversion time.

ADC operating frequency

MIN

MAX

UNIT

ADC operating frequency

MHz

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