Texas Instruments ADS5413EVM, User Manual

2-3

Circuit Description

2.2.3

Control Inputs

The EVM has three discrete inputs to control the operation of the device.

2.2.3.1

Power Down

With jumper W7 installed between pins 2 and 3, the ADC is in power down
mode. The device is in operate mode with jumper W7 installed between pins
1 and 2 or removed. (The device has a weak internal pulldown resistor on this
pin).

2.2.3.2

External Reference

With jumper W1 installed between pins 2 and 3, the ADC is in internal
reference mode. The device is in external reference mode with jumper W1
installed between pins 1 and 2. (The device has a weak internal pulldown
resistor on this pin).

2.2.3.3

Duty Cycle Adjust Select

With jumper W5 installed between pins 2 and 3, the ADC is in the duty cycle
adjust mode (DCS). The DCS is disabled with jumper W5 installed between
pins 1 and 2. (The device has a weak internal pullup resistor on this pin).

2.2.4

Power

Power is supplied to the EVM via banana jack sockets. A separate connection
is provided for a 3.3-V core supply (J6 and J5), 1.8-V/3.3-V digital driver supply
(J13 and J14), and 

±

5-V differential amplifier and external reference generator

supplies (J7, J8, and J11). The digital driver supply is only required if jumper
W2 is between pins 2 and 3.

2.2.5

Outputs

The data outputs from the ADC are buffered using a SN74AVC16244 before
going to header J10. The ADC and output buffer can provide 1.8-V or 3.3-V
output levels. This is selected by the voltage placed on the digital driver power
inputs (DRVDD). J10 is a standard 40-pin header on a 100-mil grid and allows
easy connection to a logic analyzer.