66
SLAS826F – MARCH 2015 – REVISED MARCH 2017
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Specifications
Copyright © 2015–2017, Texas Instruments Incorporated
lists the dynamic parameters of the ADC.
(1)
VeREF- pin should be connected to onboard ground for ADC14VRSEL = 0xE.
(2)
ADC clock derived from HFXT oscillator.
Table 5-29. 14-Bit ADC, Dynamic Parameters
(1)
over recommended ranges of supply voltage and operating free-air temperature (unless otherwise noted)
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNIT
SINAD
(2)
Signal-to-noise and distortion
1 Msps, ADC14DIF = 0, ADC14VRSEL = 0xE,
2.5-V reference, 20-kHz input sine,
LDO based operation
71
73
dB
1 Msps, ADC14DIF = 0, ADC14VRSEL = 0xE,
2.5-V reference, 20-kHz input sine,
DC-DC based operation
62
70
1 Msps, ADC14DIF = 1, ADC14VRSEL = 0xE,
2.5-V reference, 20-kHz input sine
79
81
ENOB
(2)
Effective number of bits
1 Msps, ADC14DIF = 0, ADC14VRSEL = 0xE,
2.5-V reference, 20-kHz input sine,
LDO based operation
11.5
11.8
bit
1 Msps, ADC14DIF = 0, ADC14VRSEL = 0xE,
2.5-V reference, 20-kHz input sine,
DC-DC based operation
10
11.3
1 Msps, ADC14DIF = 1, ADC14VRSEL = 0xE,
2.5-V reference, 20-kHz input sine
12.8
13.2
CMRR_DC
Common-mode rejection ratio,
DC
Common-mode input signal = 0 to VREF pp at DC,
ADC14DIF = 1
70
85
dB
CMRR_AC
Common-mode rejection ratio,
AC
Common-mode input signal = 0 to VREF pp at
1 MHz, ADC14DIF = 1
55
65
dB
PSRR_DC
Power supply rejection ratio,
DC
AV
CC
= AV
CC (min)
to AV
CC(max)
,
ADC14DIF = 0, ADC14VRSEL = 0xE
1
2.5
mV/V
AV
CC
= AV
CC (min)
to AV
CC(max)
,
ADC14DIF = 1, ADC14VRSEL = 0xE
50
150
µV/V
PSRR_AC
Power supply rejection ratio,
AC
dAV
CC
= 0.1 V at 1 kHz,
ADC14DIF = 0, ADC14VRSEL = 0xE
1
mV/V
dAV
CC
= 0.1 V at 1 kHz,
ADC14DIF = 1, ADC14VRSEL = 0xE
50
µV/V