MSP430F5335IPZ datasheet(39/112 Pages) TI1

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MSP430F5338, MSP430F5336, MSP430F5335, MSP430F5333

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SLAS721D – AUGUST 2010 – REVISED DECEMBER 2015

5.40 REF, External Reference

over recommended ranges of supply voltage and operating free-air temperature (unless otherwise noted)

(1)

PARAMETER

TEST CONDITIONS

VCC

MIN

TYP

MAX

UNIT

Positive external

VeREF+

VeREF+ > VREF-/VeREF-

(2)

1.4

AVCC

reference voltage input

Negative external

VREF-/VeREF-

VeREF+ > VREF-/VeREF-

(3)

1.2

reference voltage input

VeREF+ –

Differential external

VeREF+ > VREF-/VeREF-

(4)

1.4

AVCC

VREF-/VeREF-

reference voltage input

1.4 V

≤ VeREF+ ≤ VAVCC , VeREF- = 0 V,

fADC12CLK = 5 MHz, ADC12SHTx = 1h,

2.2 V, 3 V

–26

Conversion rate 200 ksps

IVeREF+, IVREF-

Static input current

µA

/VeREF-

1.4 V

≤ VeREF+ ≤ VAVCC , VeREF- = 0 V,

fADC12CLK = 5 MHZ, ADC12SHTx = 8h,

2.2 V, 3 V

–1.2

+1.2

Conversion rate 20 ksps

Capacitance at VREF+

CVREF+/-

µF

or VREF- terminal(5)

(1)

The external reference is used during ADC conversion to charge and discharge the capacitance array. The input capacitance, Ci, is also

the dynamic load for an external reference during conversion. The dynamic impedance of the reference supply should follow the

recommendations on analog-source impedance to let the charge settle for 12-bit accuracy.

(2)

The accuracy limits the minimum positive external reference voltage. Lower reference voltage levels may be applied with reduced

accuracy requirements.

(3)

The accuracy limits the maximum negative external reference voltage. Higher reference voltage levels may be applied with reduced

accuracy requirements.

(4)

The accuracy limits minimum external differential reference voltage. Lower differential reference voltage levels may be applied with

reduced accuracy requirements.

(5)

Two decoupling capacitors, 10 µF and 100 nF, should be connected to VREF to decouple the dynamic current required for an external

reference source if it is used for the ADC12_A. See also the MSP430x5xx and MSP430x6xx Family User's Guide (SLAU208).

Specifications

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Product Folder Links: MSP430F5338 MSP430F5336 MSP430F5335 MSP430F5333

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