Texas-instruments Digital Signal Processor SM320F2812-HT Manual de usuario descargar pdf (Pagina 133)

SM320F2812-HT

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SGUS062B– JUNE 2009– REVISED JUNE 2011

Table 6-47. AC Specifications

(1) (2)

= –55°C to 125°C T

= 220°C

PARAMETER UNIT

MIN TYP MAX MIN TYP MAX

SINAD Signal-to-noise ratio + distortion 62 57 dB

SNR Signal-to-noise ratio 62 57 dB

THD Total harmonic distortion -68 -68 dB

ENOB (SNR) Effective number of bits 10.1 9.1 Bits

SFDR Spurious free dynamic range 69 68 dB

(1) Not production tested.

(2) Validated at the following conditions: ADC Input Frequency = 10.71 KHz, XCLKIN = 30 MHz, PLLCR = 0xA (SYSCLK = 150 MHz),

HSPCP = 3 (ADCCLK= 25 MHz), ADCCLKPS = 1 (ADCCLK= 12.5 MHz), CPS = 0 (ADCCLK =12.5 MHZ), ACQ_PS (SH) = 3

6.29.3 Current Consumption for Different ADC Configurations (at 25-MHz ADCCLK)

Table 6-48. Current Consumption

(1)

DDA

(TYP)

(2)

DDAIO

(TYP) I

DD1

(TYP) ADC OPERATING MODE/CONDITIONS

(3)

Mode A (Operational Mode):

40 mA 1 μA 0.5 mA –BG and REF enabled

–PWD disabled

Mode B:

–ADC clock enabled

7 mA 0 5 μA

–BG and REF enabled

–PWD enabled

Mode C:

–ADC clock enabled

1 μA 0 5 μA

–BG and REF disabled

–PWD enabled

Mode D:

–ADC clock disabled

1 μA 0 0

–BG and REF disabled

–PWD enabled

(1) Not production tested.

(2) IDDA – includes current into V

DDA1

/ V

DDA2

and AV

DDREFBG

(3) Test Conditions: SYSCLKOUT = 150 MHz

ADC module clock = 25 MHz

ADC performing a continuous conversion of all 16 channels in Mode A

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