Texas Instruments IC MCU 16B MSP430G2131IPW14 TSSOP-14 TID MSP430G2131IPW14 Datenbogen
Produktcode
MSP430G2131IPW14
MSP430G2x31
MSP430G2x21
MSP430G2x21
SLAS694J – FEBRUARY 2010 – REVISED FEBRUARY 2013
10-Bit ADC, External Reference
(1)
(MSP430G2x31 Only)
over recommended ranges of supply voltage and operating free-air temperature (unless otherwise noted)
PARAMETER
TEST CONDITIONS
V
CC
MIN
TYP
MAX
UNIT
VEREF+ > VEREF–,
1.4
V
CC
SREF1 = 1, SREF0 = 0
Positive external reference input
VEREF+
V
voltage range
(2)
VEREF–
≤
VEREF+
≤
V
CC
– 0.15 V,
1.4
3
SREF1 = 1, SREF0 = 1
(3)
Negative external reference input
VEREF–
VEREF+ > VEREF–
0
1.2
V
voltage range
(4)
Differential external reference
Δ
VEREF
input voltage range,
VEREF+ > VEREF–
(5)
1.4
V
CC
V
Δ
VEREF = VEREF+ – VEREF–
0 V
≤
VEREF+
≤
V
CC
,
3 V
±1
SREF1 = 1, SREF0 = 0
I
VEREF+
Static input current into VEREF+
µA
0 V
≤
VEREF+
≤
V
CC
– 0.15 V
≤
3 V,
3 V
0
SREF1 = 1, SREF0 = 1
(3)
I
VEREF–
Static input current into VEREF–
0 V
≤
VEREF–
≤
V
CC
3 V
±1
µA
(1)
The external reference is used during conversion to charge and discharge the capacitance array. The input capacitance, C
I
, is also the
dynamic load for an external reference during conversion. The dynamic impedance of the reference supply should follow the
recommendations on analog-source impedance to allow the charge to settle for 10-bit accuracy.
recommendations on analog-source impedance to allow the charge to settle for 10-bit accuracy.
(2)
The accuracy limits the minimum positive external reference voltage. Lower reference voltage levels may be applied with reduced
accuracy requirements.
accuracy requirements.
(3)
Under this condition the external reference is internally buffered. The reference buffer is active and requires the reference buffer supply
current I
current I
REFB
. The current consumption can be limited to the sample and conversion period with REBURST = 1.
(4)
The accuracy limits the maximum negative external reference voltage. Higher reference voltage levels may be applied with reduced
accuracy requirements.
accuracy requirements.
(5)
The accuracy limits the minimum external differential reference voltage. Lower differential reference voltage levels may be applied with
reduced accuracy requirements.
reduced accuracy requirements.
10-Bit ADC, Timing Parameters (MSP430G2x31 Only)
over recommended ranges of supply voltage and operating free-air temperature (unless otherwise noted)
PARAMETER
TEST CONDITIONS
V
CC
MIN
TYP
MAX
UNIT
ADC10SR = 0
0.45
6.3
ADC10 input clock
For specified performance of
f
ADC10CLK
3 V
MHz
frequency
ADC10 linearity parameters
ADC10SR = 1
0.45
1.5
ADC10 built-in
ADC10DIVx = 0, ADC10SSELx = 0,
f
ADC10OSC
3 V
3.7
6.3
MHz
oscillator frequency
f
ADC10CLK
= f
ADC10OSC
ADC10 built-in oscillator, ADC10SSELx = 0,
3 V
2.06
3.51
f
ADC10CLK
= f
ADC10OSC
t
CONVERT
Conversion time
µs
13 ×
f
ADC10CLK
from ACLK, MCLK, or SMCLK,
ADC10DIV ×
ADC10SSELx
≠
0
1/f
ADC10CLK
Turn-on settling time
t
ADC10ON
(1)
100
ns
of the ADC
(1)
The condition is that the error in a conversion started after t
ADC10ON
is less than ±0.5 LSB. The reference and input signal are already
settled.
10-Bit ADC, Linearity Parameters (MSP430G2x31 Only)
over recommended ranges of supply voltage and operating free-air temperature (unless otherwise noted)
PARAMETER
TEST CONDITIONS
V
CC
MIN
TYP
MAX
UNIT
E
I
Integral linearity error
3 V
±1
LSB
E
D
Differential linearity error
3 V
±1
LSB
E
O
Offset error
Source impedance R
S
< 100
Ω
3 V
±1
LSB
E
G
Gain error
3 V
±1.1
±2
LSB
E
T
Total unadjusted error
3 V
±2
±5
LSB
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