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ZHCSCI3A May 2014 – September 2018 MSP430F67451A , MSP430F67461A , MSP430F67471A , MSP430F67481A , MSP430F67491A , MSP430F67651A , MSP430F67661A , MSP430F67671A , MSP430F67681A , MSP430F67691A , MSP430F67751A , MSP430F67761A , MSP430F67771A , MSP430F67781A , MSP430F67791A

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机械数据 (封装 | 引脚)

PEU|128
- MPQF058B
PZ|100
- MTQF013A

散热焊盘机械数据 (封装 | 引脚)

PZ|100
- QFND428

订购信息

Table 5-50 10-Bit ADC, External Reference

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

PARAMETER		TEST CONDITIONS	V_CC	MIN	MAX	UNIT
V_eREF+	Positive external reference voltage input	V_eREF+ > V_eREF–⁽²⁾		1.4	AV_CC	V
V_eREF–	Negative external reference voltage input	V_eREF+ > V_eREF–⁽³⁾		0	1.2	V
(V_eREF+ – V_eREF–)	Differential external reference voltage input	V_eREF+ > V_eREF–⁽⁴⁾		1.4	AV_CC	V
I_VeREF+, I_VeREF–	Static input current	1.4 V ≤ V_eREF+ ≤ V_AVCC , V_eREF– = 0 V, f_ADC10CLK = 5 MHz, ADC10SHTx = 0x0001, Conversion rate 200 ksps	2.2 V, 3 V	–26	+26	µA
I_VeREF+, I_VeREF–	Static input current	1.4 V ≤ V_eREF+ ≤ V_AVCC , V_eREF– = 0 V, f_ADC10CLK = 5 MHZ, ADC10SHTX = 0x1000, Conversion rate 20 ksps	2.2 V, 3 V	–1	+1	µA
C_VREF+	Capacitance at VREF+ terminal	See ⁽⁵⁾		10		µF

(1) The external reference is used during ADC conversion to charge and discharge the capacitance array. The input capacitance, C_I, 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 10-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 ADC10_A. Also see the MSP430x5xx and MSP430x6xx Family User's Guide.