TMS320F2809, TMS320F2808, TMS320F2806
TMS320F2802, TMS320F2801, UCD9501
TMS320C2802, TMS320C2801, and TMS320F2801x DSPs
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SPRS230H–OCTOBER 2003–REVISED JUNE 2006
6.9.7.1 ADC Power-Up Control Bit Timing
ADC Power Up Delay
ADC Ready for Conversions
PWDNBG
PWDNREF
PWDNADC
t
d(BGR)
t
d(PWD)
Request for
ADC
Conversion
Figure 6-21. ADC Power-Up Control Bit Timing
Table 6-39. ADC Power-Up Delays
PARAMETER(1)
MIN
TYP
MAX
UNIT
td(BGR)
td(PWD)
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.
5
ms
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.
20
50
µs
1
ms
(1) Timings maintain compatibility to the 281x ADC module. The 280x ADC also supports driving all 3 bits at the same time and waiting
td(BGR) ms before first conversion.
Table 6-40. Current Consumption for Different ADC Configurations (at 12.5-MHz ADCCLK)(1)(2)
ADC OPERATING MODE
CONDITIONS
BG and REF enabled
VDDA18
VDDA3.3
UNIT
Mode A (Operational Mode):
30
2
mA
•
•
PWD disabled
Mode B:
Mode C:
Mode D:
9
5
5
0.5
20
15
mA
µA
µA
•
•
•
ADC clock enabled
BG and REF enabled
PWD enabled
•
•
•
ADC clock enabled
BG and REF disabled
PWD enabled
•
•
•
ADC clock disabled
BG and REF disabled
PWD enabled
(1) Test Conditions:
SYSCLKOUT = 100 MHz
ADC module clock = 12.5 MHz
ADC performing a continuous conversion of all 16 channels in Mode A
(2) VDDA18 includes current into VDD1A18 and VDD2A18. VDDA3.3 includes current into VDDA2 and VDDAIO
.
Electrical Specifications
119
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