LM3S1621 Datasheet, PDF (902/947 Pages) Texas Instruments – ARM and Thumb are registered trademarks and Cortex is a trademark

Electrical Characteristics
21.14
Analog-to-Digital Converter (ADC)
Table 21-25. ADC Characteristics^a
Parameter Parameter Name
Min
Nom
Max
Unit
Maximum single-ended, full-scale analog input
-
-
3.0
V
voltage, using internal reference
Maximum single-ended, full-scale analog input
-
-
V_REFA
V
voltage, using external reference
Minimum single-ended, full-scale analog input voltage 0.0
-
-
V
V_ADCIN
Maximum differential, full-scale analog input voltage,
-
-
1.5
V
using internal reference
Maximum differential, full-scale analog input voltage,
-
-
V_REFA/2
V
using external reference
Minimum differential, full-scale analog input voltage 0.0
-
-
V
N
Resolution
10
bits
F_ADC
T_ADCCONV
F_ADCCONV
ADC internal clock frequency^b
Conversion time^c
Conversion rate^c
15.9952
16
1
1000
16.0048
MHz
µs
k samples/s
T_ADCSAMP Sample time
187.5
-
-
ns
T_LT
Latency from trigger to start of conversion
-
2
-
system clocks
I_L
ADC input leakage
-
-
2.0
µA
R_ADC
ADC equivalent resistance
-
-
10
kΩ
C_ADC
ADC equivalent capacitance
0.9
1.0
1.1
pF
E_L
Integral nonlinearity (INL) error
-
-
±3
LSB
E_D
Differential nonlinearity (DNL) error
-
-
±3
LSB
E_O
Offset error
-
-
±20
LSB
E_G
Full-scale gain error
E_TS
Temperature sensor accuracy^d
-
-
±30
LSB
-
-
±5
°C
a. The ADC reference voltage is 3.0 V. This reference voltage is internally generated from the 3.3 VDDA supply by a band
gap circuit.
b. The ADC must be clocked from the PLL or directly from an external clock source to operate properly.
c. The conversion time and rate scale from the specified number if the ADC internal clock frequency is any value other than
16 MHz.
d. Note that this parameter does not include ADC error.
902
January 21, 2012
Texas Instruments-Production Data