CRD42L51 Cirrus Logic Inc, CRD42L51 Datasheet - Page 37

• Manufacturer Part Number: CRD42L51
• Description: Ref Bd Low-voltage Stereo Codec
• Manufacturer: Cirrus Logic Inc

DS679F1
4.4.7
Line-Level Outputs and Filtering
The CODEC contains on-chip buffer amplifiers capable of producing line level single-ended outputs on
AOUTA and AOUTB. These amplifiers are ground centered and do not have any DC offset. A load stabi-
lizer circuit, shown in the
Connection Diagram (Hardware Mode)” on page
DAC amplifiers to drive line or headphone outputs.
Also shown in the Typical Connection diagrams is the recommended passive output filter to support high-
er impedances such as those found on the inputs to operational amplifiers. “Rext”, shown in the typical
connection diagrams, is the input impedance of the receiving device.
The invert and digital gain controls may be used to provide phase and/or amplitude compensation for an
external filter.
The delta-sigma conversion process produces high frequency noise beyond the audio passband, most of
which is removed by the on-chip analog filters. The remaining out-of-band noise can be attenuated using
an off-chip low pass filter.
Software
Controls:
(after Limiter)
MAX[2:0]
MAX[2:0]
Limiter
Output
Input
Volume
“DAC Output Control (Address 08h)” on page
& AOUTB (Address 17h)” on page
ARATE[5:0]
“Typical Connection Diagram (Software Mode)” on page 10
Figure 16. Peak Detect & Limiter
ATTACK/RELEASE SOUND
CUSHION
66.
RRATE[5:0]
11, is required on the analog outputs. This allows the
57,
“AOUTx Volume Control: AOUTA (Address 16h)
CUSH[2:0]
AOUTx_VOL[7:0] volume
adjusted manually when
control should NOT be
Limiter is enabled.
and the
CS42L51
“Typical
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