EVAL-AD7853CB 查看數據表（PDF） - Analog Devices

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EVAL-AD7853CB

3 V to 5 V Single Supply, 200 kSPS 12-Bit Sampling ADCs

Analog Devices 

AD7853/AD7853L

STATUS REGISTER

The arrangement of the status register is shown below. The status register is a read-only register and contains 16 bits of data. The

status register is selected by first writing to the control register and putting two 1s in RDSLT1 and RDSLT0. The function of the

bits in the status register are described below. The power-up status of all bits is 0.

START

WRITE TO CONTROL REGISTER

SETTING RDSLT0 = RDSLT1 = 1

READ STATUS REGISTER

MSB

ZERO

Figure 6. Flowchart for Reading the Status Register

BUSY

ZERO

ZERO

ZERO

ZERO PMGT1 PMGT0

RDSLT1 RDSLT0 2/3 MODE

X

CALMD CALSLT1 CALSLT0

STCAL

LSB

Bit Mnemonic

15 ZERO

14 BUSY

13 ZERO

12 ZERO

11 ZERO

10 ZERO

9 PMGT1

8 PMGT0

7 RDSLT1

6 RDSLT0

5 2/3 MODE

4X

3 CALMD

2 CALSLT1

1 CALSLT0

0 STCAL

Status Register Bit Function Descriptions

Comment

This bit is always 0.

Conversion/Calibration Busy Bit. When this bit is 1, it indicates that there is a conversion or calibration in

progress. When this bit is 0, no conversion or calibration is in progress.

These four bits are always 0.

Power Management Bits. These bits, along with the SLEEP pin, will indicate whether or not the part is in a

power-down mode. See Table VI in Power-Down Section for description.

Both of these bits are always 1, indicating it is the status register that is being read. See Table II.

Interface Mode Select Bit. With this bit at 0, the device is in Interface Mode 2. With this bit at 1, the device

is in Interface Mode 1. This bit is reset to 0 after every read cycle.

Don’t care bit.

Calibration Mode Bit. A 0 in this bit indicates a self-calibration is selected; a 1 in this bit indicates a system

calibration is selected (see Table III).

Calibration Selection Bits and Start Calibration Bit. The STCAL bit is read as a 1 if a calibration is in

progress and as a 0 if no calibration is in progress. The CALSLT1 and CALSLT0 bits indicate

which of the calibration registers are addressed for reading and writing (see section on the Calibration

Registers for more details).

REV. B

–11–

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