LM3S9B81 Datasheet, PDF (1095/1155 Pages) Texas Instruments – Stellaris® LM3S9B81 Microcontroller

Stellaris® LM3S9B81 Microcontroller
25.2.8
Analog-to-Digital Converter
Table 25-24. ADC Characteristics^a
Parameter Parameter Name
Min
V_ADCIN Maximum single-ended, full-scale analog input voltage,
-
using internal reference
Maximum single-ended, full-scale analog input voltage, -
using external reference
Minimum single-ended, full-scale analog input voltage 0.0
Maximum differential, full-scale analog input voltage,
-
using internal reference
Maximum differential, full-scale analog input voltage,
-
using external reference
Minimum differential, full-scale analog input voltage
0.0
N
Resolution
f_ADC
ADC internal clock frequency^b
14
t_ADCCONV Conversion time^c
f _ADCCONV
Conversion rate
c
Nom
Max
-
3.0
-
V_REFA
-
-
-
1.5
-
V_REFA/2
-
-
10
16
18
1
1000
Unit
V
V
V
V
V
V
bits
MHz
µs
k samples/s
t_LT
Latency from trigger to start of conversion
-
2
-
system clocks
I_L
ADC input leakage
-
-
±1.0
µA
R_ADC
ADC equivalent resistance
-
-
10
kΩ
C_ADC
ADC equivalent capacitance
0.9
1.0
1.1
pF
E_L
Integral nonlinearity error
-
-
±1
LSB
E_D
Differential nonlinearity error
-
-
±1
LSB
E_O
Offset error
-
-
±1
LSB
E_G
Full-scale gain error
-
-
±3
LSB
E_TS
Temperature sensor accuracy
-
-
±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.
June 29, 2010
Texas Instruments-Advance Information
1095