MSP430F5338, MSP430F5336, MSP430F5335, MSP430F5333
SLAS721D – AUGUST 2010 – REVISED DECEMBER 2015
www.ti.com
5.34 12-Bit ADC, Power Supply and Input Range Conditions
over recommended ranges of supply voltage and operating free-air temperature (unless otherwise noted)
(1)
PARAMETER
TEST CONDITIONS
V
CC
MIN
TYP
MAX
UNIT
AVCC and DVCC are connected together,
AV
CC
Analog supply voltage
AVSS and DVSS are connected together,
2.2
3.6
V
V(AVSS) = V(DVSS) = 0 V
V
(Ax)
Analog input voltage range
(2)
All ADC12 analog input pins Ax
0
AV
CC
V
2.2 V
150
200
Operating supply current into
I
ADC12_A
f
ADC12CLK
= 5 MHz
(4)
µA
AV
CC
terminal
(3)
3 V
150
250
Only one terminal Ax can be selected at one
C
I
Input capacitance
2.2 V
20
25
pF
time
R
I
Input MUX ON resistance
0 V
≤
VIN
≤
V(AVCC)
10
200
1900
Ω
(1)
The leakage current is specified by the digital I/O input leakage.
(2)
The analog input voltage range must be within the selected reference voltage range V
R+
to V
R–
for valid conversion results. If the
reference voltage is supplied by an external source or if the internal voltage is used and REFOUT = 1, then decoupling capacitors are
required. See
Section 5.40
and
Section 5.41
.
(3)
The internal reference supply current is not included in current consumption parameter I
ADC12
.
(4)
ADC12ON = 1, REFON = 0, SHT0 = 0, SHT1 = 0, ADC12DIV = 0
5.35 12-Bit ADC, Timing Parameters
over recommended ranges of supply voltage and operating free-air temperature (unless otherwise noted)
PARAMETER
TEST CONDITIONS
V
CC
MIN
TYP
MAX
UNIT
For specified performance of ADC12 linearity
parameters using an external reference voltage or
0.45
4.8
5.0
AVCC as reference
(1)
f
ADC12CLK
ADC conversion clock
For specified performance of ADC12 linearity
2.2 V, 3 V
MHz
0.45
2.4
4.0
parameters using the internal reference
(2)
For specified performance of ADC12 linearity
0.45
2.4
2.7
parameters using the internal reference
(3)
Internal ADC12
f
ADC12OSC
ADC12DIV = 0, f
ADC12CLK
= f
ADC12OSC
2.2 V, 3 V
4.2
4.8
5.4
MHz
oscillator
(4)
REFON = 0, Internal oscillator,
2.2 V, 3 V
2.4
3.1
ADC12OSC used for ADC conversion clock
t
CONVERT
Conversion time
µs
External f
ADC12CLK
from ACLK, MCLK or SMCLK,
(5)
ADC12SSEL
≠
0
R
S
= 400
Ω
, R
I
= 200
Ω
, C
I
= 20 pF,
t
Sample
Sampling time
2.2 V, 3 V
1000
ns
τ
= [R
S
+ R
I
] × C
I
(6)
(1)
REFOUT = 0, external reference voltage: SREF2 = 0, SREF1 = 1, SREF0 = 0. AVCC as reference voltage: SREF2 = 0, SREF1 = 0,
SREF0 = 0. The specified performance of the ADC12 linearity is ensured when using the ADC12OSC. For other clock sources, the
specified performance of the ADC12 linearity is ensured with f
ADC12CLK
maximum of 5 MHz.
(2)
SREF2 = 0, SREF1 = 1, SREF0 = 0, ADC12SR = 0, REFOUT = 1
(3)
SREF2 = 0, SREF1 = 1, SREF0 = 0, ADC12SR = 0, REFOUT = 0. The specified performance of the ADC12 linearity is ensured when
using the ADC12OSC divided by 2.
(4)
The ADC12OSC is sourced directly from MODOSC inside the UCS.
(5)
13 × ADC12DIV × 1/f
ADC12CLK
(6)
Approximately 10 Tau (
τ
) are needed to get an error of less than ±0.5 LSB:
t
Sample
= ln(2
n+1
) x (R
S
+ R
I
) × C
I
+ 800 ns, where n = ADC resolution = 12, R
S
= external source resistance
36
Specifications
Copyright © 2010–2015, Texas Instruments Incorporated
Submit Documentation Feedback
Product Folder Links:
MSP430F5338 MSP430F5336 MSP430F5335 MSP430F5333
Содержание MSP430F5333
Страница 110: ......
