Datasheet

MSP430F5438, MSP430F5437, MSP430F5436, MSP430F5435
MSP430F5419, MSP430F5418
SLAS612D –AUGUST 2009–REVISED AUGUST 2013 www.ti.com
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
f
ADC12CLK
2.2 V, 3 V 0.45 4.8 5.4 MHz
parameters
Internal ADC12
f
ADC12OSC
ADC12DIV = 0, f
ADC12CLK
= f
ADC12OSC
2.2 V, 3 V 4.2 4.65 5.0 MHz
oscillator
(1)
REFON = 0, Internal oscillator,
2.2 V, 3 V 2.4 3.1
f
ADC12OSC
= 4.2 MHz to 5.4 MHz
t
CONVERT
Conversion time µs
External f
ADC12CLK
from ACLK, MCLK or SMCLK,
(2)
ADC12SSEL ≠ 0
Turn on settling time of
t
ADC12ON
See
(3)
100 ns
the ADC
R
S
= 400 Ω, R
I
= 1000 Ω, C
I
= 30 pF,
t
Sample
Sampling time 2.2 V, 3 V 1000 ns
τ = [R
S
+ R
I
] × C
I
(4)
(1) The ADC12OSC is sourced directly from MODOSC inside the UCS.
(2) 13 × ADC12DIV × 1/f
ADC12CLK
(3) The condition is that the error in a conversion started after t
ADC12ON
is less than ± 0.5 LSB. The reference and input signal are already
settled.
(4) Approximately ten 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
12-Bit ADC, Linearity Parameters
over recommended ranges of supply voltage and operating free-air temperature (unless otherwise noted)
PARAMETER TEST CONDITIONS V
CC
MIN TYP MAX UNIT
1.4 V ≤ (V
eREF+
– V
REF–
/V
eREF–
)min ≤ 1.6 V ±2
Integral
E
I
2.2 V, 3 V LSB
linearity error
1.6 V < (V
eREF+
– V
REF–
/V
eREF–
)min ≤ V
AVCC
±1.7
Differential (V
eREF+
– V
REF–
/V
eREF–
)min ≤ (V
eREF+
– V
REF–
/V
eREF–
),
E
D
2.2 V, 3 V ±1 LSB
linearity error C
VREF+
= 20 pF
(V
eREF+
– V
REF–
/V
eREF–
)min ≤ (V
eREF+
– V
REF–
/V
eREF–
),
E
O
Offset error 2.2 V, 3 V ±1 ±3.5 LSB
Internal impedance of source R
S
< 100 Ω, C
VREF+
= 20 pF
(V
eREF+
– V
REF–
/V
eREF–
)min ≤ (V
eREF+
– V
REF–
/V
eREF–
),
E
G
Gain error 2.2 V, 3 V ±1.1 ±2 LSB
C
VREF+
= 20 pF
Total unadjusted (V
eREF+
– V
REF–
/V
eREF–
)min ≤ (V
eREF+
– V
REF–
/V
eREF–
),
E
T
2.2 V, 3 V ±2 ±5 LSB
error C
VREF+
= 20 pF
62 Submit Documentation Feedback Copyright © 2009–2013, Texas Instruments Incorporated
Product Folder Links: MSP430F5438 MSP430F5437 MSP430F5436 MSP430F5435 MSP430F5419 MSP430F5418