Datasheet

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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.
55 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.
55 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
55 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) control) power down.
Swap Inputs: Off (per channel Swap Inputs: On (per channel On an individual-channel basis, allows the user to toggle
control) 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.
12 SLAU205 – January 2008
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