MSP430F6638IPZ datasheet(48/133 Pages) TI

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8.43 REF, External Reference

over recommended ranges of supply voltage and operating free-air temperature (unless otherwise noted)(1)

PARAMETER

TEST CONDITIONS

VCC

MIN

MAX

UNIT

VeREF+

Positive external reference

voltage input

VeREF+ > VREF-/VeREF- (2)

1.4

AVCC

VREF-/VeREF-

Negative external

reference voltage input

VeREF+ > VREF-/VeREF- (3)

1.2

VeREF+ –

VREF-/VeREF-

Differential external

reference voltage input

VeREF+ > VREF-/VeREF- (4)

1.4

AVCC

IVeREF+, IVREF-/

VeREF-

Static input current

1.4 V ≤ VeREF+ ≤ VAVCC , VeREF- = 0 V,

fADC12CLK = 5 MHz, ADC12SHTx = 1h,

Conversion rate 200 ksps

2.2 V, 3 V

–26

µA

1.4 V ≤ VeREF+ ≤ VAVCC , VeREF- = 0 V,

fADC12CLK = 5 MHz, ADC12SHTx = 8h,

Conversion rate 20 ksps

2.2 V, 3 V

–1.2

+1.2

CVREF+/-

Capacitance at VREF+ or

VREF- terminal(5)

µF

(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)

Connect two decoupling capacitors, 10 µF and 100 nF, to VREF to decouple the dynamic current required for an external reference

source if it is used for the ADC12_A. Also see the MSP430F5xx and MSP430F6xx Family User's Guide.

MSP430F6638, MSP430F6637, MSP430F6636, MSP430F6635, MSP430F6634

MSP430F6633, MSP430F6632, MSP430F6631, MSP430F6630

SLAS566G – JUNE 2010 – REVISED SEPTEMBER 2020

www.ti.com

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MSP430F6638IPZ Datasheet(PDF) 48 Page - Texas Instruments

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