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tsu4

td6

tw5

tw5

SAMPLE

CONVERT

tCONV

Incomplete

Conversion

Incomplete

Conversion

tCONV

tacq1

td6

WAIT

SAMPLE

CONVERT

WAIT

CS

CONVST

CONVST_QUAL

(Device Internal)

DEVICE STATE

BUSY

DATA READ OPERATION

ADS8370

SLAS450 – JUNE 2005

4. Conversion abort command

An ongoing conversion can be aborted by using the conversion abort command. This is done by forcing

another start of conversion (a valid CONVST_QUAL falling edge) onto an ongoing conversion as shown in

Figure 44. The device enters the wait state after an aborted conversion. If the previous conversion was

successfully aborted, the device output reads 0xFF00 on SDO.

Figure 44. Conversion Abort

Data read control is independent of conversion control. Data can be read either during conversion or during

sampling. Data that is read during a conversion involves latency of one sample. The start of a new data frame

around the fall of BUSY is constrained by tsu2, tsu3, th2, and th8.

1. SPI Interface:

A data read operation in SPI interface mode is shown in Figure 45. FS must be tied high for operating in this

mode. The MSB of the output data is available at the falling edge of CS. MSB – 1 is shifted out at the first

rising edge after the first falling edge of SCLK after CS falling edge. Subsequent bits are shifted at the

subsequent rising edges of SCLK. If another data frame is attempted (by pulling CS high and subsequently

low) during an active data frame, then the ongoing frame is aborted and a new frame is started.

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