MSP430G2230-EP Datasheet, PDF (26/40 Pages) Texas Instruments – MIXED SIGNAL MICROCONTROLLER

MSP430G2230-EP
SLAS863 – AUGUST 2012
www.ti.com
10-Bit ADC, External Reference⁽¹⁾
over recommended ranges of supply voltage and up to operating free-air temperature, T_A = 105°C (unless otherwise noted)
PARAMETER
TEST CONDITIONS
V_CC
MIN TYP MAX UNIT
VEREF+
Positive external reference input
voltage range ⁽²⁾
VEREF+ > VEREF–,
SREF1 = 1, SREF0 = 0
VEREF– ≤ VEREF+ ≤ V_CC – 0.15 V,
SREF1 = 1, SREF0 = 1⁽³⁾
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
over recommended ranges of supply voltage and up to operating free-air temperature, T_A = 105°C (unless otherwise noted)
PARAMETER
TEST CONDITIONS
V_CC
MIN TYP MAX UNIT
f_ADC10CLK
ADC10 input clock
frequency
For specified performance of
ADC10 linearity parameters
ADC10SR = 0
ADC10SR = 1
3V
0.45
0.45
6.3
MHz
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 MHz
3V
2.06
3.51
13 ×
µs
ADC10DIV ×
1/f_ADC10CLK
100 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
over recommended ranges of supply voltage and up to operating free-air temperature, T_A = 105°C (unless otherwise noted)
PARAMETER
TEST CONDITIONS
V_CC
MIN TYP MAX UNIT
E_I
Integral linearity error
3V
±1 LSB
E_D
Differential linearity error
3V
±1 LSB
E_O
Offset error
Source impedance R_S < 100 Ω
3V
±1 LSB
E_G
Gain error
3V
±1.1
±2 LSB
E_T
Total unadjusted error
3V
±2
±5 LSB
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