Datasheet

GND
5 to 36 V
VSS -
VSS +
J7
J11
J9
J12
JP17
open
JP16
1
JP19
1
5 V
Analog
VDD
Digital
VDD
THS4509
To ADC
To ADC
ToClock
Generator
Option
ToClock
Generator
Option, USB
Port, CMOS
buffer
ToUSB
Port
TPS5420D
SwitchingRegulator
to5.3V
TPS79501
LDORegulator
to5V
TPS79633
LDO3.3V
TPS79601
LDO1.8V
(optionfor3.3V)
TPS79601
LDO3.3V
TPS79633
LDO3.3V
ToClockGen.
option,toUSB
port
www.ti.com Circuit Description
Figure 3. ADS61x9/55xx Power Distribution
Some ADC devices that may be evaluated on the ADS61x9/55xx platform do not take 1.8 V for the digital
supply, but rather require 3.3 V for the digital supply. For this reason an adjustable voltage regulator was
chosen to generate the digital supply, and the digital supply may be changed to 3.3 V by changing the
value of a resistor, R12. This resistor does not need to be changed in the field unless the ADC is being
changed, as the EVM ships with the correct digital supply voltage for the ADC that is installed.
Power for the optional THS4509 operational amplifier is supplied by banana jacks J9 and J11. If the
amplifier is being evaluated, 5 V is supplied to J9 and J11 is connected to ground. Otherwise, these inputs
may be left unconnected.
Although various power options are available on this EVM, care must be taken while applying power on J7
as different options have different voltage ranges specified. Table 2 displays the general jumper setting
information; Table 3 displays the various power option settings. Prior to making any jumper settings, see
the schematics located at the end of this document.
Table 2. EVM Power Supply Jumper Description
EVM Banana Jack Description Jumper setting
J7 Input 6-V to 36-V power supply; default - apply just 5 V
JP13 3.3VA_IN 1-2 → Connect 3.3-V AVDD to TPS79633 output
JP14 3.3VD_IN 1-2 → Connect 3.3-V DVDD to TPS79633 output
JP16 TPS79501 INPUT SELECT 1-2 → Connects 5.3 V to IP of TPS79501; 2-3 → TPS79501 IP
connected to J7
JP19 5V_AUX 2-3 → TPS79501 op as 5v_Aux rails; 1-2 → 5V_aux rail
connected to J7
JP17 TS5420 INPUT SELECT Shunt → J7 connected to TPS5420D
SLWU061A – December 2008 – Revised June 2009 ADS61x9/55xxEVM 9
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