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CS5513-BS

16-bit and 20-bit, 8-pin ∆Σ ADC

Cirrus Logic 

CS5510/11/12/13

2.5.3 Output Coding

As shown in Tables 1 and 2, the CS5510/11/12/13

present output conversions as 24-bit conversion

words. The first bit of the conversion word indi-

cates that a conversion is done through SDO fall-

ing from a logic high to a logic low level. The first

and the fourth bits output will always be zero. The

second and third bits are error flags, representing

an overflow or oscillation condition. In the

CS5510/11, there are four more bits of zero, and

the remaining 16 bits are the conversion data, out-

put MSB first (Table 2). In the CS5512/13, the final

CS

20 bits are the conversion data, which is output

MSB first (Table 1).

Bits D22-D21 are the two flag bits. The OF (Over-

range Flag) bit is set to a logic 1 any time the input

signal is more positive than positive full scale, or

more negative than negative full scale. It is cleared

back to logic 0 whenever a conversion word occurs

which is not overranged. The OD (Oscillation De-

tect) bit is set to a logic 1 any time that an oscillatory

condition is detected in the modulator. This does

not occur under normal operating conditions, but

may occur whenever the input to the converter is ex-

SCLK

SDO

0 OF OD 0 0 0 0 0 MSB

LSB

Data Tim e

24 SCLKs

00

Figure 17. Data Word Timing for the CS5511.

CS

SCLK

SDO

0 OF OD 0 MSB

LSB

Data Tim e

24 SCLKs

00

Figure 18. Data Word Timing for the CS5512.

CS

SCLK

SDO

0 OF OD 0 MSB

LSB

Data Tim e

24 SCLKs

00

Figure 19. Data Word Timing for the CS5513.

DS337F3

17

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