CS42448-CQZ Cirrus Logic Inc, CS42448-CQZ Datasheet - Page 54
CS42448-CQZ
Manufacturer Part Number
CS42448-CQZ
Description
IC CODEC 108DB 192KHZ 64LQFP
Manufacturer
Cirrus Logic Inc
Type
Audio Codecr
Datasheet
1.CS42448-CQZ.pdf
(64 pages)
Specifications of CS42448-CQZ
Package / Case
64-LQFP
Data Interface
Serial
Resolution (bits)
24 b
Number Of Adcs / Dacs
6 / 8
Sigma Delta
Yes
Dynamic Range, Adcs / Dacs (db) Typ
105 / 108 (Differential), 102 / 105 (Single-Ended)
Voltage - Supply, Analog
3.14 V ~ 5.25 V
Voltage - Supply, Digital
3.14 V ~ 5.25 V
Operating Temperature
-10°C ~ 70°C
Mounting Type
Surface Mount
Number Of Adc Inputs
10
Number Of Dac Outputs
8
Conversion Rate
192 KSPS
Interface Type
Serial (I2C, SPI)
Resolution
24 bit
Maximum Operating Temperature
+ 70 C
Mounting Style
SMD/SMT
Minimum Operating Temperature
- 10 C
Number Of Channels
6 ADC/8 DAC
Thd Plus Noise
- 98 dB ADC / - 98 dB DAC, - 95 dB ADC / - 95 dB DAC
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
For Use With
598-1151 - BOARD EVAL FOR CS42448 CODEC
Lead Free Status / Rohs Status
Lead free / RoHS Compliant
Other names
598-1033
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Manufacturer
Quantity
Price
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54
7.1.1
7.1.2
Passive Input Filter
The passive filter implementation shown in
will not provide optimum source impedance for the ADC modulators. Full analog performance will there-
fore not be realized using a passive filter.
In this topology the distortion performance is affected, but the dynamic range performance is not limited.
Passive Input Filter w/Attenuation
Some applications may require signal attenuation prior to the ADC. The full-scale input voltage will scale
with the analog power supply voltage. For VA = 5.0 V, the full-scale input voltage is approximately
2.8 Vpp, or 1 Vrms (most consumer audio line-level outputs range from 1.5 to 2 Vrms).
Figure 29
pedance on the analog inputs, the full distortion performance cannot be realized. Also, the resistor divider
circuit will determine the input impedance into the input filter. In the circuit shown in
impedance is approximately 5 kΩ. By doubling the resistor values, the input impedance will increase to
10 kΩ. However, in this case the distortion performance will drop due to the increase in series resistance
on the analog inputs.
shows a passive input filter with 6 dB of signal attenuation. Due to the relatively high input im-
100 kΩ
100 kΩ
100 kΩ
Figure 28. Passive Input Filter
150 Ω
150 Ω
150 Ω
10 μF
10 μF
10 μF
Figure 28
Figure 28
4.7 μF
illustrates the unity gain, passive input filter solution.
2700 pF
2700 pF
2700 pF
C0G
C0G
C0G
will attenuate any noise energy at 6.144 MHz but
AIN1+,2+,3+,4+
AIN1-,2-,3-,4-
AIN5A,6A
AIN5B,6B
ADC1-2
ADC3
Figure
CS42448
29, the input
DS648F3