CC430F613 datasheet(68/120 Pages) TI

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ECCN 5E002 TSPA - Technology / Software Publicly Available

CC430F613x

CC430F612x

CC430F513x

SLAS554G – MAY 2009 – REVISED FEBRUARY 2013

www.ti.com

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

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+ –

Differential external reference voltage

VeREF+ > VREF–/VeREF–

(4)

1.4

AVCC

VREF–/VeREF–)

input

1.4 V

≤ VeREF+ ≤ VAVCC ,

VeREF– = 0 V

fADC12CLK = 5

2.2 V, 3 V

±8.5

±26

µA

MHz,ADC12SHTx = 1h,

Conversion rate 200ksps

IVeREF+

Static input current

IVREF–/VeREF–

1.4 V

≤ VeREF+ ≤ VAVCC ,

VeREF– = 0 V

fADC12CLK = 5

2.2 V, 3 V

±1

µA

MHz,ADC12SHTx = 8h,

Conversion rate 20ksps

Capacitance at VREF+/-terminal, external

CVREF+/-

µF

reference(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 allow the charge to 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 CC430 Family User's Guide (SLAU259).

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