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adc on the msp430f149

Started by Alimata SACKO February 19, 2004
hi,

I want to know if someone know the type of ADC is used in the MSP430F149?
thanks

Beginning Microcontrollers with the MSP430

MSP430F149?

Nobody knows. Not even Texas Instruments.

JJS
> Nobody knows. Not even Texas Instruments.

LOL! That's because they buy them from Analog Devices!
> > I want to know if someone know the type of ADC is used in the
> MSP430F149?
>
> Nobody knows. Not even Texas Instruments.
>
> JJS

Successive approximation?
Successive approximation. The nine most significant bits resolved by charge
redistribution and the three least significant by a resistor array.

I've not seen it stared directly but here is my evidence from SLAU049:
- There is a SAR (successive approximation register) shown in figure 15-2.
- From 15.2.1: "It is important to note that the 3LSBs of the conversion are
resolved resistively."
- From 15.3.2: "During sampling, the analog input signal is applied to the
internal capacitor array of the A/D core."
- From 15.6: "Thirteen conversion clocks (ADC12CLK) are required to complete
a conversion."

Gary.
--- In msp430@msp4..., onestone <onestone@b...> wrote:
> John Speth wrote:
>
> >>I want to know if someone know the type of ADC is used in the
> >
> > MSP430F149?
> >
> > Nobody knows. Not even Texas Instruments.
>

Of course we know - it's a SAR type. If you look at the schematic
that's shown in the User's Guide, right under the block that
says "12-bit A/D Converter Core", there's a block that says 12-bit
SAR. We probably don't advertise the type that much because non-
analog engineers don't always understand (or care about) the
difference.