CS5014-KL14 datasheet(17/46 Pages) CIRRUS

17 / 46 page

To interface with a 16-bit data bus, the BW input

to the CS5012A/14/16 should be held high and

all data bits (12, 14 and 16 for the CS5012A,

CS5014 and CS5016 respectively) read in paral-

lel on pin s D4-D15 (CS5012A), D2-D15

(CS5014), or D0-D15 (CS5016). With an 8-bit

bus, the converter’s result must be read in two

portions. In this instance, BW should be held low

and the 8 MSB’s obtained on the first read cycle

following a conversion. The second read cycle

will yield the remaining LSB’s (4, 6 or 8 for the

CS5012A/14/16 respectively) with 4, 2 or 0 trail-

ing zeros. Both bytes appear on pins D0-D7. The

upper/lower bytes of the same data will continue

to toggle on subsequent reads until the next con-

version finishes. Status bit S2 indicates which

byte will appear on the next data read operation.

The CS5012A/14/16 internally buffer their output

data, so data can be read while the devices are

tracking or converting the next sample. Therefore,

retrieving the converters’ digital output requires

no reduction in ADC throughput. Enabling the 3-

state outputs while the CS5012A/14/16 is

converting will not introduce conversion errors.

Connecting CMOS logic to the digital outputs is

recommended. Suitable logic families include

4000B, 74HC, 74AC, 74ACT, and 74HCT.

STATUS BIT

STATUS

DEFINITION

END OF CONVERSION

Falls upon completion of a conversion,

and returns high on the first subsequent read.

RESERVED

Reserved for factory use.

LOW BYTE/HIGH BYTE

When data is to be read in an 8-bit format (BW=0),

indicates which byte will appear at the output next.

END OF TRACK

When low, indicates the input has been acquired to

the devices specified accuracy.

RESERVED

Reserved for factory use.

TRACKING

High when the device is tracking the input.

CONVERTING

High when the device is converting the held input.

CALIBRATING

High when the device is calibrating.

Table 2. Status Pin Definitions

D12 D11 D10

D15 D14 D13

8- or 16-Bit

Data Bus

Data

(A0=1)

Status

(A0=0)

"X" Denotes High Impedance Output

8-Bit Bus

(BW=0)

16-Bit Bus

(BW=1)

B11

B10

CS5012A

CS5014

CS5016

B13

B11

B12

B10

B11

B10

B15

B13

B11

B14

B12

B10

B13

B12

B10

B11

B15

B14

B11 B10

B12

B13

CS5016

CS5014

CS5012A

Figure 7. CS5012A/14/16 Data Format

CS5012A, CS5014, CS5016

DS14F6

2-23

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