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ADS8331 View Datasheet(PDF) - Texas Instruments

Part NameDescriptionManufacturer
ADS8331 2.7V~5.5V, 16 Bit 500KSPS Low Power Serial ADC / Low-Power, 16-Bit, 500kSPS, 4-/8-Channel Unipolar Input TI
Texas Instruments TI
ADS8331 Datasheet PDF : 39 Pages
First Prev 31 32 33 34 35 36 37 38 39
ADS8331
ADS8332
www.ti.com
SBAS363 – DECEMBER 2009
SCLK skew between converters and data path delay through the converters configured in daisy-chain mode can
affect the maximum frequency of SCLK. The delay can also be affected by supply voltage and loading. It may be
necessary to slow down the SCLK when the devices are configured in daisy-chain mode. Typical delays are
shown in Figure 50.
ADS8331/32 #3
CDI
Logic
Delay
Plus PAD
2.7ns
D
Logic
Delay
Q
< = 8 .3 ns
CLK
SDO
Logic
Delay
Plus PAD
8.3ns
Serial data
output
CDI
Logic
Delay
Plus PAD
2.7ns
D
Logic
Delay
Q
<= . ns
CLK
ADS8331/32 #2
SDO
Logic
Delay
Plus PAD
8.3ns
Serial data
input
CDI
Logic
Delay
Plus PAD
2.7ns
D
Logic
Delay
Q
< = 8 .3 ns
CLK
ADS8331/32 #1
SDO
Logic
Delay
Plus PAD
8.3ns
SCLK input
Figure 50. Typical Delays Through Converters Configured in Daisy-Chain Mode
RESET FUNCTION
The ADS8331/32 can be reset with three different methods: internal POR, software reset, and external reset
using the RESET pin.
The internal POR circuit is activated when power is initially applied to the converter. This internal circuit
eliminates the need for commands to be sent to the converter after power-on in order to set the default mode of
operation (see the Power-On Sequence Timing section for further details).
Software reset can be used to place the converter in the default mode by setting the CFR_D0 bit to '0' in the
Configuration register (see Table 5). This bit is automatically returned to '1' (default) after the converter is reset.
This reset method is useful in systems that cannot dedicate a separate control signal to the RESET pin. In these
situations, the RESET pin must be connected to VBD in order for the ADS8331/32 to operate properly.
If communication in the system becomes corrupted and a software reset cannot be issued, the RESET pin can
be used to reset the device manually. In order to reset the device and return the device to default mode, this pin
must held low for a minimum of 25ns.
After the ADS8331/32 detects a reset condition, the minimum time before the device can be reconfigured by
FS/CS going low and data clocking in on SDI is 2μs.
Copyright © 2009, Texas Instruments Incorporated
Product Folder Link(s): ADS8331 ADS8332
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