CDB4385 Cirrus Logic Inc, CDB4385 Datasheet - Page 30

• Manufacturer Part Number: CDB4385
• Description: BOARD EVAL FOR CS4385 DAC
• Manufacturer: Cirrus Logic Inc

Specifications of CDB4385

• Number Of Dac's: 8
• Number Of Bits: 24
• Outputs And Type: 8, Differential
• Sampling Rate (per Second): 192k
• Data Interface: Serial
• Dac Type: Voltage
• Voltage Supply Source: Analog and Digital
• Operating Temperature: -40°C ~ 85°C
• Utilized Ic / Part: CDB4385
• Description/function: Audio D/A
• Operating Supply Voltage: 5 V
• Product: Audio Modules
• For Use With/related Products: CS4385
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant, Contains lead / RoHS non-compliant
• Other names: 598-1154

CS4385
Figure 24. Recommended Output Filter
4.11
The MUTEC Outputs
The MUTEC1 and MUTEC234 pins have an auto-polarity detect feature. The MUTEC output pins are high
impedance at the time of reset. The external mute circuitry needs to be self-biased into an active state in
order to be muted during reset. Upon release of reset, the CS4385 will detect the status of the MUTEC pins
(high or low) and will then select that state as the polarity to drive when the mutes become active. The ex-
ternal-bias voltage level that the MUTEC pins see at the time of release of reset must meet the “MUTEC
auto-detect input high/low voltage” specifications as outlined in the Digital Characteristics section.
Figure 25
shows a single example of both an active high and an active low mute drive circuit. In these de-
signs, the pull-up and pull-down resistors have been especially chosen to meet the input high/low threshold
when used with the MMUN2111 and MMUN2211 internal bias resistances of 10 kΩ. Use of the Mute Control
function is not mandatory, but recommended, for designs requiring the absolute minimum in extraneous
clicks and pops. Also, use of the Mute Control function can enable the system designer to achieve idle chan-
nel noise/signal-to-noise ratios which are only limited by the external mute circuit.
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