14-bit
ADC
J6
J7
14-bit
ADC
J8
J9
J10
14-bit
ADC
J11
J12
14-bit
ADC
J13
J14
Digital
Block
+
Output
Formatter
CLKOUTABP/M
DAB[1:13]P/M
13
DAB[0]/OVRAB
CLKOUTCDP/M
DCD[1:13]P/M
13
DCD[0]/OVRCD
J5
Power
Supply
Circuits
USB
to
SPI
6 V only
J1
USB
J4
ADS4449
CLK IN
CH B
CH C
CH D
CH A
Introduction
2
SLAU485A – January 2013 – Revised April 2016
Copyright © 2013–2016, Texas Instruments Incorporated
ADS4449 EVM User Guide
1
Power Supply Options
......................................................................................................
2
ADS4449 EVM Connectors
................................................................................................
3
ADS4449 EVM Jumper Options
...........................................................................................
4
ADS4449 EVM Pushbutton Switches
.....................................................................................
5
ADS4449 EVM LED Indicators
.............................................................................................
1
Introduction
1.1
EVM Block Diagram
shows a simplified block diagram of the default configuration of the EVM. The four analog inputs
are supplied to the EVM through a single-ended SMA connection, then transformer coupled, turning the
single-ended signal into a balanced differential signal, and then input to the ADS4449. A dual transformer
input circuit provides better phase and amplitude balance of the input signal when compared to the
performance delivered by a single transformer input circuit.
Figure 1. Simplified ADS4449 EVM Block Diagram
The clock input is supplied by way of a single-ended signal to an SMA connector and transformer coupled
producing a differential clock signal for the ADS4449.
Power to the EVM is supplied by connecting the provide power cable between J1 of the EVM and a 6-
VDC power supply capable of providing 3 amps. Banana jacks may also be used to supply power to the
EVM. All necessary voltages for the ADS4449 are derived from the 6-V input connection.
