Cirrus Logic CS5513 - Manual (Page 15)

CS5510/11/12/13
DS337F4 15
CS5511/13 and oscillates at 64 kHz ±32 kHz. The
output word rate (OWR) for the CS5511/13 is de-
rived from the internal oscillator, and is equal to
f
osc
/612. Due to the part-to-part variances in the
oscillator frequency, the OWR of the CS5511/13
can vary between 53 Sps and 159 Sps.
2.5 Performing Conversions
After power and a clock source are established to
the CS5510/11/12/13, the ADCs begin performing
conversions. The three sections that follow explain
how to read conversion data from each ADC, and
decode the conversion word into the respective
flag and data bits. Keep in mind that in the
CS5510/12, SCLK provides the external clock
source for the converter. Data is clocked from the
CS5510/12 at the rate set by the external clock
source (typically 32.768 kHz). The CS5511/13 pro-
vides an on-chip oscillator for the master clock. In
the CS5511/13, SCLK is asynchronous to the on-
chip oscillator and can be clocked at a rate up to
2 MHz.
VD+ = 2.5 V to 5.25 V
To SCLK
Fairchild NC7SU04
or 1/6 74HCU04
22 pF 47 pF
32.768 kHz
49.9 K Ω
10 M Ω
Figure 12. External (CMOS Compatible) Clock
Counter/Timer
SCLK
SDO
CS
CS5510/12
µC
Figure 13. Using a Microcontroller as a Clock
0
0.0005
0.001
0.0015
0.002
0.0025
0.003
0.0035
0.004
10 30 50 70 90 110 130
SCLK (kHz)
Li
n
ear
it
y Err
o
r (
%
F
S
)
OWR = SCLK
612
Figure 14. Typical Linearity Error for CS5510.
0
0.0005
0.001
0.0015
0.002
0.0025
0.003
0 20 40 60 80 100 120 140 160 180 200
SCLK (kHz)
Line
arity
Error (%FS)
OWR = SCLK
612
Figure 15. Typical Linearity Error for CS5512.