參數(shù)資料
型號： TMP470R1B768PGE
廠商： Texas Instruments, Inc.
英文描述： 16/32-Bit RISC Flash Microcontroller
中文描述： 16/32位RISC閃存微控制器
文件頁數(shù)： 43/50頁
文件大?。?/td> 393K
代理商： TMP470R1B768PGE
www.ti.com
MULTI-BUFFERED A-TO-D CONVERTER (MibADC)
TMS470R1B768
16/32-Bit RISC Flash Microcontroller
SPNS108A–AUGUST 2005–REVISED AUGUST 2006
The multi-buffered A-to-D converter (MibADC) has a separate power bus for its analog circuitry that enhances
the A-to-D performance by preventing digital switching noise on the logic circuitry, which could be present on
V
SS
and V
CC
, from coupling into the A-to-D analog stage. All A-to-D specifications are given with respect to
AD
REFLO
unless otherwise noted.
Resolution
Monotonic
Output conversion code
10 bits (1024 values)
Assured
00h to 3FFh [00 for V
AI
≤
AD
REFLO
; 3FF for V
AI
≥
AD
REFHI
]
Table 10. MibADC Recommended Operating Conditions
(1)
MIN
V
SSAD
V
SSAD
V
SSAD
– 0.3
MAX
V
CCAD
V
CCAD
V
CCAD
+ 0.3
UNIT
V
V
V
AD
REFHI
AD
REFLO
V
AI
A-to-D high-voltage reference source
A-to-D low-voltage reference source
Analog input voltage
Analog input clamp current
(2)
(V
AI
< V
SSAD
– 0.3 or V
AI
> V
CCAD
+ 0.3)
I
AIC
–2
2
mA
(1)
(2)
For V
and V
recommended operating conditions, see the "Device Recommended Operating Conditions" table.
Input currents into any ADC input channel outside the specified limits could affect conversion results of other channels.
Table 11. Operating Characteristics Over Full Ranges of Recommended Operating Conditions
(1)(2)
PARAMETER
Analog input resistance
DESCRIPTION/CONDITIONS
See
Figure 18
.
MIN
TYP
250
MAX UNIT
500
10
30
1
5
R
I
pF
pF
μA
mA
Conversion
Sampling
C
I
Analog input capacitance
See
Figure 18
.
I
AIL
I
ADREFHI
Analog input leakage current
AD
REFHI
input current
Conversion range over which specified
accuracy is maintained
See
Figure 18
.
AD
REFHI
= 3.6 V, AD
REFLO
= V
SSAD
–1
CR
AD
REFHI
- AD
REFLO
3
3.6
V
Difference between the actual step width
and the ideal value. See
Figure 19
.
Maximum deviation from the best straight
line through the MibADC. MibADC
transfer characteristics, excluding the
quantization error. See
Figure 20
.
Maximum value of the difference
between an analog value and the ideal
midstep value. See
Figure 21
.
E
DNL
Differential nonlinearity error
±
1.5
LSB
E
INL
Integral nonlinearity error
±
2.0
LSB
E
TOT
Total error/absolute accuracy
±
2
LSB
(1)
(2)
V
= AD
REFHI
1 LSB = (AD
REFHI
– AD
REFLO
)/2
10
for the MibADC
43
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