Datasheet

5VCC
EN
W2
DisconnectWhen
UsingExternalClock
W3
Internalor
External
ModularClock
Select
INT
EXT
MCLK
8 Use as a Stand-Alone EVM
9 EVM Operation
9.1 Analog Input
9.2 Digital Control
FSX
GPIO
START
Shortedfor
ADCProoperation
W4
Use as a Stand-Alone EVM www.ti.com
Figure 6. W2 and W3 Jumpers for External Modulator Clock
The ADS1672EVM can be used as a stand-alone EVM, provided that the proper control signals are
applied to serial input connector P2 (top or bottom side). The required power supplies (+5VA and +3.3VD)
can be connected directly to J4 pins 3 and 9 or test points TP5 and TP7, respectively. Both supplies are
referenced to J4 pin 6 or TP8, and should be sourced from clean, well-regulated lab supplies for best
performance. The minimum control lines necessary are the active-low chip select ( CS) and START inputs,
which are applied to P2 pins 1 and 7. If an external serial clock is desired, the signal is applied to P2 pin
5. The ADS1672 digital configuration pins can be set statically by using SW1, or can be manipulated
through U5 by an I
2
C controller connected to P2 pins 16 and 20 (all SW1 positions must be set to off
when using U5). For additional details, please see section Section 9 of this document and review the
ADS1672 datasheet.
This section provides information on the analog input, digital control, and general operating conditions of
the ADS1672EVM.
The differential analog input to the ADS1672EVM board is applied through J1 (–IN) and J2 (+IN) or P3.1
(–IN) and P3.2 (+IN).
The digital control signals can be applied directly to P2 (top or bottom side). The modular ADS1672EVM
can also be connected directly to a DSP or microcontroller interface board, such as the 5-6K Interface
EVM or HPA-MCU Interface boards available from Texas Instruments. For a complete list of compatible
interface and/or accessory boards for the EVM or the ADS1672, see the relevant product folder on the TI
web site.
Some of the digital signals to the ADS1672 are controlled using three methods: SW1 slide switches, GPIO
pins through P2.17 (W4 configured to GPIO), or I
2
C control using U5.
You can access a general-purpose input/output (GPIO) port through P2.17 by also connecting W4.2
(START) to W4.3 (GPIO), as shown in Figure 7 . Otherwise, for proper ADCPro operation, pin 1 (FSX) is
connected by a jumper to pin 2 (START).
Figure 7. Connector W4 for GPIO Communication
ADS1672EVM and ADS1672EVM-PDK User's Guide10 SBAU147 – March 2009
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