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MSP432P401R, MSP432P401M
SLAS826 –MARCH 2015 www.ti.com
Table 5-42. 14-Bit ADC, External Reference
over recommended ranges of supply voltage and operating free-air temperature (unless otherwise noted)
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
Positive external reference voltage
V
eREF+
V
eREF+
> V
eREF-
(1)
1.45 AV
CC
V
input
Negative external reference voltage AV
CC
–
V
eREF-
V
eREF+
> V
eREF-
(2)
0 V
input 1.45
(V
eREF+
- Differential external reference
V
eREF+
> V
eREF-
(3)
1.45 AV
CC
V
V
eREF-
) voltage input
1.45 V ≤ V
eREF+
≤ V
AVCC
, V
eREF-
= 0 V,
f
ADC14CLK
= 25 MHz, ADC14SHTx = 1h, –45 45 uA
ADC14DIF = 0, Conversion rate 1 Msps
I
VeREF+
Static input current single ended
I
VeREF-
input mode
1.45 V ≤ V
eREF+
≤ V
AVCC
, V
eREF-
= 0 V,
f
ADC14CLK
= 5 MHz, ADC14SHTx = 1h, –9 9 µA
ADC14DIF = 0, Conversion rate 200 ksps
1.45 V ≤ V
eREF+
≤ V
AVCC
, V
eREF-
= 0 V,
f
ADC14CLK
= 25 MHz, ADC14SHTx = 1h, –90 90 uA
ADC14DIF = 1, Conversion rate 1Msps
I
VeREF+
Static input current differential input
1.45 V ≤ V
eREF+
≤ V
AVCC
, V
eREF-
= 0 V
I
VeREF-
mode
f
ADC14CLK
= 5 MHz, ADC14SHTx = 1h,
–18 18 uA
ADC14DIF = 1
Conversion rate 200ksps
Peak input current single ended
I
VeREF+
0 V ≤ V
eREF+
≤ V
AVCC
, ADC14DIF = 0 TBD mA
input mode
Peak input current differential input
I
VeREF+
0 V ≤ V
eREF+
≤ V
AVCC
, ADC14DIF = 1 TBD mA
mode
C
VeREF±
Capacitance at VeREF± terminal
(4)
5 µF
AV
CC
= AV
CC (min)
– AV
CC(max)
PSRR_DC Power supply rejection ratio (DC) TBD µV/V
T
A
= 25°C
PSRR_AC Power supply rejection ratio (AC) dAV
CC
= 0.1V at 1 kHz TBD mV/V
(1) The accuracy limits the minimum positive external reference voltage. Lower reference voltage levels down to 1.2 V may be applied with
reduced accuracy requirements for DNL, INL and SNR at 1 Msps or for ≤500-ksps specified accuracy can still be achieved.
(2) The accuracy limits the maximum negative external reference voltage. For 1-Msps, higher reference voltage levels up to AVCC – 1.2 V
may be applied with reduced speed and accuracy, or for ≤500 ksps, specified accuracy can still be achieved.
(3) The accuracy limits minimum external differential reference voltage. Lower differential reference voltage levels may be applied with
reduced accuracy requirements.
(4) Two decoupling capacitors, 5 µF and 50 nF, should be connected to VeREF to decouple the dynamic current required for an external
reference source if it is used for the ADC14. See also the MSP432P4xx Family Technical Reference Manual (SLAU356).
48 Specifications Copyright © 2015, Texas Instruments Incorporated
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