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TI ADC SPI Control Interface

Table 3. ADS528X Frequently Used Registers

Default Value

Alternate Value

Description

ADS528X Reset

Issues a software reset and also sends the initialization

routine outlined in the data sheet. Furthermore, the clock is

set to differential, which matches the default EVM

configuration. A Reset should take place before any

evaluation is done.

Standby: Off

Standby: On

Toggles the ADC standby.

Powerdown: Off

Powerdown: On

Toggles the ADC power down.

PD: Powerdown

PD: Standby

Assigns the ADS528X PD pin either a power-down or

standby function.

Clock: Standby

Clock: Differential

Sets the ADC to accept either a single-ended or a

differential clock. By defualt the ADS528X EVM is

configured for a differential clock.

LSB first

MSB first

Toggles the ADC output format.

Testmode: None

Output = Ramp, Output = Deskew,

Sets the ADC to ignore the analog input and to apply a test

Output = Synch

pattern on the digital output.

Duty Cycle Correction: Off

Duty Cycle Correction: On

Toggles the duty-cycle correction feature.

Termination: Off

Termination: On

Enables the ability to provide a series source termination

on the output signals.

ADCLK: None

ADCLK: 260, 150, 94, 125, 80, 66,

Changes the value of the source termination on ADCLK.

Ω

Note that Termination must be On for values to take effect.

LCLK: None

LCLK: 260, 150, 94, 125, 80, 66,

Changes the value of the source termination on LCLK.

Ω

Note that Termination must be On for values to take effect.

OUT: None

OUT: 260, 150, 94, 125, 80, 66,

Changes the value of the source termination on the outputs

Ω

Note that Termination must be On for values to take effect.

ADCLK: 3.5 mA

ADCLK: 0.5–7.5 mA

Changes the output source current on ADCLK.

LCLK: 3.5 mA

LCLK: 0.5–7.5 mA

Changes the output source current on LCLK.

OUT: 3.5 mA

OUT: 0.5–7.5 mA

Changes the output source current on OUT.

Power Down: Off (per channel

Power Down: On (per channel

On an individual-channel basis, allows the user to toggle

control)

power down.

Swap Inputs: Off (per channel

Swap Inputs: On (per channel

On an individual-channel basis, allows the user to toggle

control)

power down.

Low-Frequency Noise

Low-Frequency Noise Suppression:

On an individual-channel basis, allows the user to toggle

Suppression: Off (per channel

On (per channel control)

the low-frequency noise-suppression mode.

control)

Gain = 0 db–12 dB (per

Gain = 0 db–12 dB (per channel

On an individual-channel basis, allows the user to apply

channel control)

control)

gain.

SLAU205 – January 2008

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