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| ADS5510_07 Datasheet, PDF (21/30 Pages) Burr-Brown (TI) – 11-Bit, 125-MSPS Analog-To-Digital Converter | |||
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www.ti.com
ADS5510
RS
RG
RT
1mF
RG
RF
+5V
10mF
0.1mF
RIN
VOCM
RIN
THS4503
10mF
0.1mF
-5V
RF
SLAS499 â JANUARY 2007
+3.3V
INP ADS5510
11-Bit / 125MSPS
INM
CM
10 W
0.1mF
Figure 27. Using the THS4503 with the ADS5510
POWER-SUPPLY SEQUENCE
The preferred power-up sequence is to ramp AVDD first, followed by DRVDD, including a simultaneous ramp of
AVDD and DRVDD. In the event that DRVDD ramps up first in the system, care must be taken to ensure that AVDD
ramps up within 10 ms. Optionally, it is recommended to put a 2-k⦠resistor from REFP (pin 29) to AVDD as
shown in Figure 28. This helps to make the device more robust to power supply ramp-up timings.
1 mF
2 kW
1W
28 AVDD
29 REFP
Figure 28.
POWER-DOWN
The device enters power-down in one of two ways: either by reducing the clock speed or by setting the PDN bit
throughout the serial programming interface. Using the reduced clock speed, power-down may be initiated for
clock frequency below 2 MSPS. The exact frequency at which the power down occurs varies from device to
device.
Using the serial interface PDN bit to power down the device places the outputs in a high-impedance state and
only the internal reference remains on to reduce the power-up time. The power-down mode reduces power
dissipation to approximately 180 mW.
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