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www.ti.com SLAS590M – MARCH 2009 – REVISED NOVEMBER 2015
5.37 12-Bit ADC, Linearity Parameters Using an External Reference Voltage or AVCC as
Reference Voltage
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 ≤ dVREF ≤ 1.6 V
(2)
±2.0
E
I
Integral linearity error
(1)
2.2 V, 3 V LSB
1.6 V < dVREF
(2)
±1.7
E
D
Differential linearity error
(1) (2)
2.2 V, 3 V ±1.0 LSB
dVREF ≤ 2.2 V
(2)
2.2 V, 3 V ±1.0 ±2.0
E
O
Offset error
(3)
LSB
dVREF > 2.2 V
(2)
2.2 V, 3 V ±1.0 ±2.0
E
G
Gain error
(3) (2)
2.2 V, 3 V ±1.0 ±2.0 LSB
dVREF ≤ 2.2 V
(2)
2.2 V, 3 V ±1.4 ±3.5
E
T
Total unadjusted error LSB
dVREF > 2.2 V
(2)
2.2 V, 3 V ±1.4 ±3.5
(1) Parameters are derived using the histogram method.
(2) The external reference voltage is selected by: SREF2 = 0 or 1, SREF1 = 1, SREF0 = 0. dVREF = V
R+
– V
R-
, V
R+
< AVCC, V
R-
> AVSS.
Unless otherwise mentioned, dVREF > 1.5 V. Impedance of the external reference voltage R < 100 Ω , and two decoupling capacitors,
10 µF and 100 nF, should be connected to VREF+ and VREF- to decouple the dynamic current. Also see the MSP430x5xx and
MSP430x6xx Family User's Guide ( SLAU208 ).
(3) Parameters are derived using a best fit curve.
5.38 12-Bit ADC, Linearity Parameters Using the Internal Reference Voltage
over recommended ranges of supply voltage and operating free-air temperature (unless otherwise noted)
PARAMETER TEST CONDITIONS
(1)
V
CC
MIN TYP MAX UNIT
ADC12SR = 0, REFOUT = 1 f
ADC12CLK
= 4.0 MHz ±1.7
Integral linearity
E
I
2.2 V, 3 V LSB
error
(2)
ADC12SR = 0, REFOUT = 0 f
ADC12CLK
= 2.7 MHz ±2.5
ADC12SR = 0, REFOUT = 1 f
ADC12CLK
= 4.0 MHz –1.0 +2.0
Differential
E
D
ADC12SR = 0, REFOUT = 1 f
ADC12CLK
= 2.7 MHz 2.2 V, 3 V –1.0 +1.5 LSB
linearity error
(2)
ADC12SR = 0, REFOUT = 0 f
ADC12CLK
= 2.7 MHz –1.0 +2.5
ADC12SR = 0, REFOUT = 1 f
ADC12CLK
= 4.0 MHz ±1.0 ±2.0
E
O
Offset error
(3)
2.2 V, 3 V LSB
ADC12SR = 0, REFOUT = 0 f
ADC12CLK
= 2.7 MHz ±1.0 ±2.0
ADC12SR = 0, REFOUT = 1 f
ADC12CLK
= 4.0 MHz ±1.0 ±2.0 LSB
E
G
Gain error
(3)
2.2 V, 3 V
ADC12SR = 0, REFOUT = 0 f
ADC12CLK
= 2.7 MHz ±1.5%
(4)
VREF
ADC12SR = 0, REFOUT = 1 f
ADC12CLK
= 4.0 MHz ±1.4 ±3.5 LSB
Total unadjusted
E
T
2.2 V, 3 V
error
ADC12SR = 0, REFOUT = 0 f
ADC12CLK
= 2.7 MHz ±1.5%
(4)
VREF
(1) The internal reference voltage is selected by: SREF2 = 0 or 1, SREF1 = 1, SREF0 = 1. dVREF = V
R+
– V
R-
.
(2) Parameters are derived using the histogram method.
(3) Parameters are derived using a best fit curve.
(4) The gain error and total unadjusted error are dominated by the accuracy of the integrated reference module absolute accuracy. In this
mode the reference voltage used by the ADC12_A is not available on a pin.
Copyright © 2009–2015, Texas Instruments Incorporated
Specifications 41
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