CS42L51-CNZR Cirrus Logic Inc, CS42L51-CNZR Datasheet - Page 35

• Manufacturer Part Number: CS42L51-CNZR
• Description: IC LV Stereo Codec F/Digital Audio Apps
• Manufacturer: Cirrus Logic Inc
• Type: Stereo Audior

Specifications of CS42L51-CNZR

• Data Interface: PCM Audio Interface
• Resolution (bits): 24 b
• Number Of Adcs / Dacs: 2 / 2
• Sigma Delta: Yes
• Dynamic Range, Adcs / Dacs (db) Typ: 98 / 98
• Voltage - Supply, Analog: 1.8V, 2.5V
• Voltage - Supply, Digital: 1.8V, 2.5V
• Operating Temperature: -10°C ~ 70°C
• Mounting Type: Surface Mount
• Package / Case: 32-QFP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• For Use With: 598-1005 - BOARD EVAL FOR CS42L51 CODEC
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: Q3956082

DS679A2
4.4.5
4.4.6
Tone Control
Shelving filters are used to implement bass and treble (boost and cut) with four selectable corner frequen-
cies. Boosting will affect peak detect and limiting when levels exceed the maximum threshold settings.
Limiter
When enabled, the limiter monitors the digital input signal before the DAC modulator, detects when levels
exceed the maximum threshold settings and lowers the AOUT volume at a programmable attack rate be-
low the maximum threshold. When the input signal level falls below the maximum threshold, the AOUT
volume returns to its original level set in the Volume Control register at a programmable release rate. At-
tack and release rates are affected by the DAC soft ramp/zero cross settings and sample rate, Fs. Limiter
soft ramp and zero cross dependency may be independently enabled/disabled.
Recommended settings: Best limiting performance may be realized with the fastest attack and slowest
release setting with soft ramp enabled in the control registers. The “cushion” bits allow the user to set a
threshold slightly below the maximum threshold for hysteresis control - this cushions the sound as the lim-
iter attacks and releases. NOTE: When the Limiter is enabled the AOUT Volume is automatically con-
trolled and should not be adjusted manually. Alternative volume control may be realized using the
PCMMIXx_VOL[6:0] bits.
Software
Controls:
Software
Controls:
(after Limiter)
MAX[2:0]
MAX[2:0]
Limiter
Output
Input
Volume
“Tone Control (Address 15h)” on page
“Limiter Release Rate Register (Address 1Ah)” on page
1Bh)” on page
ARATE[5:0]
67,
Figure 17. Peak Detect & Limiter
“DAC Control (Address 09h)” on page 55
ATTACK/RELEASE SOUND
CUSHION
RRATE[5:0]
63.
66,
CUSH[2:0]
“Limiter Attack Rate Register (Address
AOUTx_VOL[7:0] volume
adjusted manually when
control should NOT be
Limiter is enabled.
CS42L51
35