MSP43020X3 Datasheet, PDF (41/92 Pages) Texas Instruments – MIXED SIGNAL MICROCONTROLLER

www.ti.com
MSP430F20x3
MSP430F20x2
MSP430F20x1
SLAS491H – AUGUST 2005 – REVISED AUGUST 2011
10-Bit ADC, External Reference (MSP430F20x2)⁽¹⁾
over recommended ranges of supply voltage and operating free-air temperature (unless otherwise noted)
V_eREF+
PARAMETER
Positive external reference input
voltage range⁽²⁾
TEST CONDITIONS
V_eREF+ > V_eREF-,
SREF1 = 1, SREF0 = 0
V_eREF- ≤ V_eREF+ ≤ V_CC - 0.15 V,
SREF1 = 1, SREF0 = 1⁽³⁾
V_CC
MIN MAX UNIT
1.4 V_CC
V
1.4
3
V_eREF-
Negative external reference input
voltage range⁽⁴⁾
V_eREF+ > V_eREF-
0 1.2 V
ΔV_eREF
I_VeREF+
Differential external reference
input voltage range
ΔV_eREF = V_eREF+ - V_eREF-
Static input current into V_eREF+
V_eREF+ > V_eREF- ⁽⁵⁾
0 V ≤ V_eREF+ ≤ V_CC,
SREF1 = 1, SREF0 = 0
0 V ≤ V_eREF+ ≤ V_CC - 0.15 V ≤ 3 V,
SREF1 = 1, SREF0 = 1⁽³⁾
2.2 V/3 V
1.4 V_CC V
±1
µA
0
I_VeREF-
Static input current into V_eREF-
0 V ≤ V_eREF- ≤ V_CC
2.2 V/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.
(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 (MSP430F20x2)
over recommended ranges of supply voltage and operating free-air temperature (unless otherwise noted)
PARAMETER
TEST CONDITIONS
V_CC
MIN
TYP
f_ADC10CLK
ADC10 input clock
frequency
For specified performance of ^{ADC10SR = 0}
ADC10 linearity parameters _{ADC10SR = 1}
2.2 V/3 V
0.45
0.45
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⁾
2.2 V/3 V
2.2 V/3 V
3.7
2.06
13 ×
ADC10DIVx ×
1/f_ADC10CLK
MAX
6.3
1.5
UNIT
MHz
6.3 MHz
3.51
µs
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.
Copyright © 2005–2011, Texas Instruments Incorporated
41