Power Supplies

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4

Power Supplies

P3 is the power-supply input connector. Table 5 lists the configuration details for P3. Only +5V analog and

+5V digital is required to power the EVM. If desired, a jumper option (W6) is provided to supply the

ADS7953 digital core with +3.3V.

Table 5. P3 Configuration: Power-Supply Input

Pin No.

Pin Name

Function

Required

J3.1

+VA

+10V to +15V

No

J3.2

–VA

–10V to –15V

No

J3.3

+5VA

+5V analog supply

Always

J3.4

–5VA

–5V analog supply

No

J3.5

DGND

Digital ground input

Yes

J3.6

AGND

Analog ground input

Yes

J3.7

+1.8VD

1.8V digital supply

No

J3.8

VD1

Not used

No

J3.9

+3.3VD

3.3V digital supply

Yes, if +5VD is not used

J3.10

+5VD

+5V

Yes, if +3.3VD is not used

The ADS7953 digital section can be powered from +3.3V or +5V by means of jumper option W6.

5

Voltage Reference

The ADS7953EVM has three sources for the reference voltage. Jumper W2 can select the REFP voltage

from either the REF5025(U3) or from an external source applied to P1.18. Jumper W3 can select the

REFM voltage from either the analog ground (AGND) or from an external source applied to P1.20.

6

EVM Operation

The following section provides information on the analog input, digital control, and general operating

conditions of the ADS7953EVM.

6.1

Analog Input

Eight of the analog input sources (channels 0-7) can be applied directly to P1 (top or bottom side) or

through signal-conditioning modules available for the modular EVM system. The additional eight channel

sources (CH8-CH15) can be applied to connector J1. The analog input range on the EVM is identical to

that of the installed device and is dependent on the RANGE setting of the ADC (0 to 5V or 0 to 2.5V)

Each input signal can be configured to connect directly to the analog inputs of the ADS7953 through a

33

Ω series resistor with an 0.027pF capacitor to AGND. The input to CH0 can use the OPA365 buffer that

is provided (default condition, W4 jumpered pins 1-2). Jumper W4 can be placed on pins 2-3 to bypass

the unity gain buffer configuration of the OPA365.

6.2

Digital Control

The digital control signals can be applied directly to P5 (top or bottom side). The modular ADS7953EVM

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. When purchased as part of a PDK, the

ADS7953EVM can be controlled by the MMB0. For a list of compatible interface and/or accessory boards

for the EVM or the ADS7953, see the relevant product folder on the TI website. All of the digital signals

are controlled directly with pins on P2.

6

ADS79xxEVM and ADS79xxEVM-PDK

SLAU262C

– January 2009 – Revised May 2011

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