參數(shù)資料
型號: TMP320F28044GGMA
廠商: Texas Instruments, Inc.
元件分類: 數(shù)字信號處理
英文描述: Digital Signal Processor
中文描述: 數(shù)字信號處理器
文件頁數(shù): 98/107頁
文件大?。?/td> 784K
代理商: TMP320F28044GGMA
www.ti.com
6.11.1 ADC Power-Up Control Bit Timing
ADC Power Up Delay
ADC Ready for Conversions
PWDNBG
PWDNREF
PWDNADC
Request for
ADC
Conversion
t
d(BGR)
t
d(PWD)
TMS320F28044
Digital Signal Processor
SPRS357B–AUGUST 2006–REVISED MAY 2007
Figure 6-20. ADC Power-Up Control Bit Timing
Table 6-31. ADC Power-Up Delays
PARAMETER
(1)
MIN
TYP
MAX
5
UNIT
ms
t
d(BGR)
Delay time for band gap reference to be stable. Bits 7 and 6 of the ADCTRL3
register (ADCBGRFDN1/0) must be set to 1 before the PWDNADC bit is enabled.
Delay time for power-down control to be stable. Bit delay time for band-gap
reference to be stable. Bits 7 and 6 of the ADCTRL3 register (ADCBGRFDN1/0)
must be set to 1 before the PWDNADC bit is enabled. Bit 5 of the ADCTRL3
register (PWDNADC)must be set to 1 before any ADC conversions are initiated.
t
d(PWD)
20
50
μ
s
ms
1
(1)
Timings maintain compatibility to the 281x ADC module. The F28044 ADC also supports driving all 3 bits at the same time and waiting
t
d(BGR)
ms before first conversion.
Table 6-32. Current Consumption for Different ADC Configurations (at 25-MHz ADCCLK)
(1)(2)
ADC OPERATING MODE
Mode A (Operational Mode):
CONDITIONS
V
DDA18
30
V
DDA3.3
2
UNIT
mA
BG and REF enabled
PWD disabled
Mode B:
9
0.5
mA
ADC clock enabled
BG and REF enabled
PWD enabled
Mode C:
5
20
μ
A
ADC clock enabled
BG and REF disabled
PWD enabled
Mode D:
5
15
μ
A
ADC clock disabled
BG and REF disabled
PWD enabled
(1)
Test Conditions:
SYSCLKOUT = 100 MHz
ADC module clock = 25 MHz
ADC performing a continuous conversion of all 16 channels in Mode A
V
DDA18
includes current into V
DD1A18
and V
DD2A18
. V
DDA3.3
includes current into V
DDA2
and V
DDAIO
.
(2)
Electrical Specifications
98
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