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EVM Operation

7 EVM Operation

The following sections provide information on the analog input, digital control, and general operating

conditions of the ADS1258EVM.

7.1 Analog Input

The analog input sources can be applied directly to J1 (top or bottom side) or through signal-conditioning

modules available for the the modular EVM system. Signals can be applied directly to J2 for the additional

available channels.

7.2 Digital Control

The digital control signals can be applied directly to J6 (top or bottom side). The modular ADS1258EVM

can also be connected directly to a DSP or microcontroller interface board, such as the 5-6KInterface or

HPA-MCUInterface boards available from Texas Instruments, or the MMB0 if purchased as part of the

ADS!258EVM-PDK. For a list of compatible interface and/or accessory boards for the EVM, the ADS1258,

or the ADS1158, see the relevant product folder on the TI web site (www.ti.com).

7.3 Power Supply

The ADS1258 device can operate in either unipolar or bipolar mode. The ADS1258EVM can therefore

function in one of two power-supply configurations, unipolar or bipolar.

• In unipolar mode, the ADS1258 device uses a 5V analog supply. No negative power supply is needed

in this mode. The PDK requires a +5V dc supply that can be derived from a wall-mount power adapter.

• In bipolar mode, the ADS1258 is powered from a ±2.5V dual supply. This configuration requires both

a +5V supply and a –5V supply.

The power-supply mode is selected using GPIO3 (pin 12) on J6 of the ADS1258EVM. If this pin is low, the

mode is bipolar; if high, the mode is unipolar. This pin is pulled high when nothing is connected.

SBAU126C– May 2007– Revised May 2011 ADS1158EVM, ADS1258EVM, ADS1158EVM-PDK, and ADS1258EVM-PDK

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