MSP430F149 datasheet(37/59 Pages) TI

37 / 59 page

MSP430x13x, MSP430x14x, MSP430x14x1

MIXED SIGNAL MICROCONTROLLER

SLAS272F − JULY 2000 − REVISED JUNE 2004

POST OFFICE BOX 655303

• DALLAS, TEXAS 75265

electrical characteristics over recommended operating free-air temperature (unless otherwise

noted) (continued)

12-bit ADC, timing parameters

PARAMETER

TEST CONDITIONS

MIN

NOM

MAX

UNIT

fADC12CLK

For specified performance of ADC12

linearity parameters

2.2V/

0.45

6.3

MHz

fADC12OSC

Internal ADC12

oscillator

ADC12DIV=0,

fADC12CLK=fADC12OSC

2.2 V/

3.7

6.3

MHz

tCONVERT

Conversion time

CVREF+ ≥ 5 µF, Internal oscillator,

fADC12OSC = 3.7 MHz to 6.3 MHz

2.2 V/

3 V

2.06

3.51

µs

tCONVERT

Conversion time

External fADC12CLK from ACLK, MCLK or SMCLK:

ADC12SSEL

≠ 0

×ADC12DIV×

1/fADC12CLK

µs

tADC12ON‡

Turn on settling time of

the ADC

(see Note 1)

100

tSample‡

Sampling time

RS = 400 Ω, RI = 1000 Ω,

CI = 30 pF

3 V

1220

tSample‡

Sampling time

CI = 30 pF

τ = [RS + RI] x CI;(see Note 2)

2.2 V

1400

† Not production tested, limits characterized

‡ Not production tested, limits verified by design

NOTES:

1. The condition is that the error in a conversion started after tADC12ON is less than ±0.5 LSB. The reference and input signal are already

settled.

2. Approximately ten Tau (

τ) are needed to get an error of less than ±0.5 LSB:

tSample = ln(2n+1) x (RS + RI) x CI+ 800 ns where n = ADC resolution = 12, RS = external source resistance.

12-bit ADC, linearity parameters

PARAMETER

TEST CONDITIONS

MIN

NOM

MAX

UNIT

Integral linearity error

1.4 V

≤ (VeREF+ − VREF−/VeREF−) min ≤ 1.6 V

2.2 V/3 V

±2

LSB

Integral linearity error

1.6 V < (VeREF+ − VREF−/VeREF−) min ≤ [V(AVCC)]

2.2 V/3 V

±1.7

LSB

Differential linearity

error

(VeREF+ − VREF−/VeREF−)min ≤ (VeREF+ − VREF−/VeREF−),

CVREF+ = 10 µF (tantalum) and 100 nF (ceramic)

2.2 V/3 V

±1

LSB

Offset error

(VeREF+ − VREF−/VeREF−)min ≤ (VeREF+ − VREF−/VeREF−),

Internal impedance of source RS < 100 Ω,

CVREF+ = 10 µF (tantalum) and 100 nF (ceramic)

2.2 V/3 V

±2

±4

LSB

Gain error

(VeREF+ − VREF−/VeREF−)min ≤ (VeREF+ − VREF−/VeREF−),

CVREF+ = 10 µF (tantalum) and 100 nF (ceramic)

2.2 V/3 V

±1.1

±2

LSB

Total unadjusted

error

(VeREF+ − VREF−/VeREF−)min ≤ (VeREF+ − VREF−/VeREF−),

CVREF+ = 10 µF (tantalum) and 100 nF (ceramic)

2.2 V/3 V

±2

±5

LSB

MSP430F149 Datasheet(PDF) 37 Page - Texas Instruments

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