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DS138F6 11
CS5330A/31A
3.1.7 Analog Connections
Figure 1 shows the analog input connections. The analog inputs are presented to the modulators via the
AINR and AINL pins. Each analog input will accept a maximum of 4 Vpp centered at +2.4 V.
The CS5330A/31A samples the analog inputs at 128 Fs, 6.144 MHz for a 48 kHz sample-rate. The dig-
ital filter rejects all noise above 29 kHz except for frequencies right around 6.144 MHz 21.7 kHz (and
multiples of 6.144 MHz). Most audio signals do not have significant energy at 6.144 MHz. Nevertheless,
a 150 resistor in series w ith each analog input and a 10 nF capacitor across the inputs will attenuate
any noise energy at 6.144 MHz, in addition to providing the optimum source impedance for the modula-
tors. The use of capacitors which have a large voltage coefficient must be avoided since thes e will de-
grade signal linearity. It is also important that the self-resonant frequency of the capacitor be well above
the modulator sampling frequency. General purpose ceramics and film capacitors do not meet these re-
quirements. However, NPO and COG capacitors are acceptable. If active circuitry precedes the ADC, it
is recommended that the above RC filter is placed between the active circuitry and the AINR and AINL
pins. The above example frequencies scale linearly with Fs.
3.1.8 High-Pass Filter
The operational amplifiers in the input circuitry driving the CS5330A/31A ma y ge nerate a small DC o ffset
into the A/D conv erter. The CS533 0A/31A includes a high pass filter after the decimator to remove any
DC offset which could result in recording a DC level, possibly yielding "clicks" when switching between
devices in a multichannel system.
The characteristics of this first-order high pass filter are outlined in the “Digital Filter Characteristics” on
page 6
3.1.9 Initialization and Power-Down
The Initialization and Power-Down sequence is shown in Figure 4. Upon initial power-up, the digital filters
and delta-sigma modulators are reset and the internal voltage reference is powered down. The device will
remain in the Initial Power-Down mode until MCLK is presented. Once MCLK is available, the
CS5330A/31A will make a master/slave mode decision based upon the presence/absence of a 47-k
pull-down resistor on SDATA a s shown in Figure 1. The master/slave decision is made during initial pow-
er-up as shown in Figure 4.
In master mode, SCLK and LRCK are outputs where the MCLK/LRCK frequency ratio is 256x. LRCK will
appear as an outpu t 127 MCLK cycles into the initializa tion sequence. At this time, power is applied to the
internal voltage reference and the analog inputs will move to approximately 2.4 Volts. SDATA is static low
during the initialization and high pass filter settling sequence, which requires 11 ,265 LRCK cycles (235
ms at a 48 kHz output sample rate).
In slave mo de , SC LK and LRCK a re in pu ts whe r e t h e MCLK/LRCK frequency ratio must be either 256x,
384x,or 51 2x. Once the MCLK and L RCK are detected, MCLK o ccurr ences are counted over one L RCK
period to determine th e MCLK/LRCK frequency ra tio. At this time, power is applied to the internal voltage
reference and the analog inputs will move to approximately 2.4 Volts. SDATA is static high during the ini-
tialization and high pass filter settling sequence, which requires 11,265 LRCK cycles (235 ms at a 48 kHz
sample rate).