CS4245-DQZR Cirrus Logic Inc, CS4245-DQZR Datasheet - Page 46

• Manufacturer Part Number: CS4245-DQZR
• Description: IC,Soundcard Circuits,QFP,48PIN,PLASTIC
• Manufacturer: Cirrus Logic Inc
• Type: Stereo Audior

Specifications of CS4245-DQZR

• Data Interface: Serial
• Resolution (bits): 24 b
• Number Of Adcs / Dacs: 2 / 2
• Sigma Delta: Yes
• Dynamic Range, Adcs / Dacs (db) Typ: 104 / 104
• Voltage - Supply, Analog: 3.13 V ~ 5.25 V
• Voltage - Supply, Digital: 3.13 V ~ 5.25 V
• Operating Temperature: -40°C ~ 105°C
• Mounting Type: Surface Mount
• Package / Case: 48-LQFP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• For Use With: 598-1501 - BOARD EVAL FOR CS4245 CODEC
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

46
6.7
6.7.1
6.8
6.8.1
6.9
6.9.1
Reserved
Reserved
Reserved
7
7
7
Channel B PGA Control - Address 07h
Channel A PGA Control - Address 08h
ADC Input Control - Address 09h
Channel B PGA Gain (Bits 5:0)
Function:
See
Channel A PGA Gain (Bits 5:0)
Function:
Sets the gain or attenuation for the ADC input PGA stage. The gain may be adjusted from -12 dB to
+12 dB in 0.5 dB steps. The gain bits are in two’s complement with the Gain0 bit set for a 0.5 dB step.
Register settings outside of the ±12 dB range are reserved and must not be used. See
ample settings.
PGA Soft Ramp or Zero Cross Enable (Bits 4:3)
Function:
Soft Ramp Enable
Soft Ramp allows level changes, both muting and attenuation, to be implemented by incrementally ramp-
ing, in 1/8 dB steps, from the current level to the new level at a rate of 1 dB per 8 left/right clock periods.
See
Zero Cross Enable
Zero Cross Enable dictates that signal-level changes, either by attenuation changes or muting, will occur
on a signal zero crossing to minimize audible artifacts. The requested level change will occur after a time-
out period between 512 and 1024 sample periods (10.7 ms to 21.3 ms at 48 kHz sample rate) if the signal
does not encounter a zero crossing. The zero cross function is independently monitored and implemented
for each channel. See
Soft Ramp and Zero Cross Enable
Soft Ramp and Zero Cross Enable dictate that signal-level changes, either by attenuation changes or mut-
ing, will occur in 1/8 dB steps and be implemented on a signal zero crossing. The 1/8 dB level change will
“Channel A PGA Gain (Bits 5:0)” on page 46.
Table
Reserved
Reserved
Reserved
6
6
6
15.
Reserved
Table
Gain5
Gain5
Table 14. Example Gain and Attenuation Settings
5
5
5
15.
Gain[5:0]
101000
000000
011000
PGASoft
Gain4
Gain4
4
4
4
PGAZero
Gain3
Gain3
3
3
3
Setting
+12 dB
-12 dB
0 dB
Gain2
Gain2
Sel2
2
2
2
Gain1
Gain1
Sel1
1
1
1
Table 14
CS4245
Gain0
Gain0
DS656F2
Sel0
0
0
for ex-
0