MSP430FR5994_17 Datasheet, PDF (59/168 Pages) Texas Instruments – Mixed-Signal Microcontrollers

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MSP430FR5994, MSP430FR59941, MSP430FR5992, MSP430FR5964, MSP430FR5962
SLASE54A – MARCH 2016 – REVISED OCTOBER 2016
Table 5-29 lists the external reference characteristics.
Table 5-29. 12-Bit ADC, External Reference⁽¹⁾
over recommended ranges of supply voltage and operating free-air temperature (unless otherwise noted)
PARAMETER
TEST CONDITIONS
MIN MAX UNIT
V_R+
Positive external reference voltage input VeREF+ or
VeREF- based on ADC12VRSEL bit
V_R+ > V_R–
1.2 AV_CC V
V_R–
Negative external reference voltage input VeREF+ or
VeREF- based on ADC12VRSEL bit
V_R+ > V_R–
0 1.2 V
(V_R+ –
V_R–)
Differential external reference voltage input
I_VeREF+,
I_VeREF-
Static input current singled ended input mode
V_R+ > V_R–
1.2 V ≤ V_eREF+≤ V_AVCC, V_eREF- = 0 V
f_ADC12CLK = 5 MHz, ADC12SHTx = 1h,
ADC12DIF = 0, ADC12PWRMD = 0
1.2 V ≤ V_eREF+≤ V_AVCC , V_eREF- = 0 V
f_ADC12CLK = 5 MHz, ADC12SHTx = 8h,
ADC12DIF = 0, ADC12PWRMD = 01
1.2 AV_CC V
±10
µA
±2.5
I_VeREF+,
I_VeREF-
Static input current differential input mode
1.2 V ≤ V_eREF+≤ V_AVCC, V_eREF- = 0 V
f_ADC12CLK = 5 MHz, ADC12SHTx = 1h,
ADC12DIF = 1, , ADC12PWRMD = 0
1.2 V ≤ V_eREF+≤ V_AVCC , V_eREF- = 0 V
f_ADC12CLK = 5 MHz, ADC12SHTx = 8h,
ADC12DIF = 1, , ADC12PWRMD = 1
±20
µA
±5
I_VeREF+
I_VeREF+
C_VeREF+/-
Peak input current with single-ended input
Peak input current with differential input
Capacitance at VeREF+ or VeREF- terminal
0 V ≤ V_eREF+ ≤ V_AVCC, ADC12DIF = 0
0 V ≤ V_eREF+ ≤ V_AVCC, ADC12DIF = 1
See note ⁽²⁾
1.5 mA
3 mA
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 12-bit accuracy.
(2) Connect two decoupling capacitors, 10 µF and 470 nF, to VeREF to decouple the dynamic current required for an external reference
source if it is used for the ADC12_B. See also the MSP430FR58xx, MSP430FR59xx, MSP430FR68xx, and MSP430FR69xx Family
User's Guide.
Copyright © 2016, Texas Instruments Incorporated
Specifications
59
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