MSP430G22X0_15 Datasheet, PDF (29/46 Pages) Texas Instruments – MIXED SIGNAL MICROCONTROLLER

MSP430G22x0
www.ti.com
SLAS753E – JANUARY 2012 – REVISED FEBRUARY 2013
10-Bit ADC, External Reference (MSP430G2230 Only)⁽¹⁾
over recommended ranges of supply voltage and operating free-air temperature (unless otherwise noted)
VEREF+
PARAMETER
Positive external reference input
voltage range ⁽²⁾
TEST CONDITIONS
VEREF+ > VEREF–,
SREF1 = 1, SREF0 = 0
VEREF– ≤ VEREF+ ≤ V_CC – 0.15 V,
SREF1 = 1, SREF0 = 1 ⁽³⁾
V_CC
MIN TYP MAX UNIT
1.4
V_CC
V
1.4
3
VEREF–
Negative external reference input
voltage range ⁽⁴⁾
VEREF+ > VEREF–
0
1.2 V
ΔVEREF
Differential external reference
input voltage range,
ΔVEREF = VEREF+ – VEREF–
VEREF+ > VEREF– ⁽⁵⁾
1.4
V_CC V
0 V ≤ VEREF+ ≤ V_CC,
SREF1 = 1, SREF0 = 0
3V
I_VEREF+
Static input current into VEREF+
0 V ≤ VEREF+ ≤ V_CC – 0.15 V ≤ 3 V,
SREF1 = 1, SREF0 = 1⁽³⁾
3V
±1
µA
0
I_VEREF–
Static input current into VEREF– 0 V ≤ VEREF– ≤ V_CC
3V
±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.
(2) The accuracy limits the minimum positive external reference voltage. Lower reference voltage levels may be applied with reduced
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_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.
(5) The accuracy limits the minimum external differential reference voltage. Lower differential reference voltage levels may be applied with
reduced accuracy requirements.
10-Bit ADC, Timing Parameters (MSP430G2230 Only)
over recommended ranges of supply voltage and operating free-air temperature (unless otherwise noted)
PARAMETER
f_ADC10CLK
ADC10 input clock
frequency
TEST CONDITIONS
V_CC
MIN TYP MAX
For specified performance of
ADC10 linearity parameters
ADC10SR = 0
ADC10SR = 1
3V
0.45
0.45
6.3
1.5
f_ADC10OSC
t_CONVERT
ADC10 built-in oscillator
frequency
Conversion time
ADC10DIVx = 0, ADC10SSELx = 0,
f_ADC10CLK = f_ADC10OSC
ADC10 built-in oscillator, ADC10SSELx = 0,
f_ADC10CLK = f_ADC10OSC
f_ADC10CLK from ACLK, MCLK, or SMCLK:
ADC10SSELx ≠ 0
t_ADC10ON
Turn-on settling time of
the ADC
(1)
3V
3.7
6.3
3V
2.06
3.51
13 ×
ADC10DIV ×
1/f_ADC10CLK
100
UNIT
MHz
MHz
µs
ns
(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 (MSP430G2230 Only)
over recommended ranges of supply voltage and operating free-air temperature (unless otherwise noted)
PARAMETER
E_I
Integral linearity error
E_D
Differential linearity error
E_O
Offset error
E_G
Gain error
E_T
Total unadjusted error
TEST CONDITIONS
Source impedance R_S < 100 Ω
V_CC
MIN TYP
3V
3V
3V
3V
±1.1
3V
±2
MAX
±1
±1
±1
±2
±5
UNIT
LSB
LSB
LSB
LSB
LSB
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