CS5532-ASZR 查看數據表（PDF） - Cirrus Logic

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CS5532-ASZR

16-bit and 24-bit ADCs with Ultra-low-noise PGIA

Cirrus Logic 

CS5531/32/33/34-AS

Table 2. Conversion Timing – Continuous Mode

FRS (WR3-WR0) Clock Cycles Clock Cycles

(First Conversion) (All Other

Conversions)

0

0000

89528 ± 8

40960

0

0001

171448 ± 8

81920

0

0010

335288 ± 8

163840

0

0011

662968 ± 8

327680

0

0100

1318328 ± 8

655360

0

1000

2472 ± 8

1280

0

1001

12728 ± 8

2560

0

1010

17848 ± 8

5120

0

1011

28088 ± 8

10240

0

1100

48568 ± 8

20480

1

0000

107434 ± 10

49152

1

0001

205738 ± 10

98304

1

0010

402346 ± 10

196608

1

0011

795562 ± 10

393216

1

0100

1581994 ± 10

786432

1

1000

2966 ± 10

1536

1

1001

15274 ± 10

3072

1

1010

21418 ± 10

6144

1

1011

33706 ± 10

12288

1

1100

58282 ± 10

24576

2.6.3. Examples of Using CSRs to Perform

Conversions and Calibrations

Any time a calibration or conversion command is

issued (C, MC, and CC2-CC0 bits must be properly

set), the CSRP2-CSRP0 bits in the command byte

are used as pointers to address one of the Setups in

the channel-setup registers (CSRs). Table 3 details

the address decoding of the pointer the bits.

Table 3. Command Byte Pointer

(CSRP2-CSRP0)

000

001

010

011

100

101

110

111

CSR Location

CSR #1

CSR #1

CSR #2

CSR #2

CSR #3

CSR #3

CSR#4

CSR #4

Setup

1

2

3

4

5

6

7

8

The examples that follow detail situations that a

user might encounter when acquiring a conversion

or calibrating the converter. These examples as-

sume that the CSRs are programmed with the fol-

lowing physical channel order: 4, 1, 1, 2, 4, 3, 4, 4.

A physical channel is defined as the actual input

channel (AIN1 to AIN4) to which an external sig-

nal is connected.

Example 1: Single conversion using Setup 1. The

command issued is ‘10000000’. This instructs the

converter to perform a single conversion referenc-

ing Setup 1 (CSRP2 - CSRP0 = ‘000’) In this ex-

ample, Setup 1 points to physical channel 4. After

the command is received and decoded, the ADC

performs a conversion on physical channel 4 and

SDO falls to indicate that the conversion is com-

plete. To read the conversion, 40 SCLKs are then

required. Once the conversion data has been read,

the serial port returns to the command mode.

Example 2: Continuous conversions using Setup 3.

The command issued is ‘11010000’. This instructs

the converter to perform continuous conversions

referencing Setup 3 (CSRP2 - CSRP0 = ‘010’). In

this example, Setup 3 points to physical channel 1.

After the command is received and decoded, the

ADC performs a conversion on physical channel 1

and SDO falls to indicate that the conversion is

complete. The user now has three options. The user

can acquire the conversion and remain in this

mode, acquire the conversion and exit this mode, or

ignore the conversion and wait for a new conver-

sion at the next update interval, as detailed in the

continuous conversion section.

Example 3: Calibration using Setup 4. This exam-

ple assumes that the OGS bit in the Configuration

Register is set to ‘0’. The command issued is

‘10011001’. This instructs the converter to perform

a self offset calibration referencing Setup 4

(CSRP2 - CSRP0 = ‘011’). In this example, Setup

4 points to physical channel 2. After the command

is received and decoded, the ADC performs a self

DS289F5

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