SI3000-KS Silicon Laboratories Inc, SI3000-KS Datasheet - Page 19

• Manufacturer Part Number: SI3000-KS
• Description: IC VOICE CODEC 3.3V/5V 16SOIC
• Manufacturer: Silicon Laboratories Inc
• Type: Voice-Band Codecr

Specifications of SI3000-KS

• Package / Case: 16-SOIC (0.154", 3.90mm Width)
• Data Interface: Serial
• Resolution (bits): 16 b
• Number Of Adcs / Dacs: 1 / 1
• Sigma Delta: No
• Dynamic Range, Adcs / Dacs (db) Typ: 84 / 84
• Voltage - Supply, Analog: 3 V ~ 5.25 V
• Voltage - Supply, Digital: 3 V ~ 5.25 V
• Operating Temperature: 0°C ~ 70°C
• Mounting Type: Surface Mount
• Number Of Adc Inputs: 3
• Number Of Dac Outputs: 2
• Conversion Rate: 12 KSPs
• Interface Type: Serial
• Resolution: 16 bit
• Maximum Operating Temperature: + 70 C
• Mounting Style: SMD/SMT
• Minimum Operating Temperature: 0 C
• Number Of Channels: 1 ADC, 1 DAC
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant, Contains lead / RoHS non-compliant

Si3000
Loopback Operation
The
Si3000
advanced
design
provides
the
manufacturer with increased ability to determine system
functionality during production line tests, as well as
support for end-user diagnostics. Two loopback modes
exist for this purpose, allowing increased coverage of
system components.
The digital loopback1 mode allows an external device to
send audio data to the SDI input pin and receive the
signal through the SDO output pin. In this mode, the
group delay of the digital filters is present. This mode
allows testing of the digital filters, DAC, and ADC. To
enable this mode, set the DL bit of register 2.
The digital loopback2 mode allows an external device to
send audio data to the SDI input pin and receive the
signal through the SDO output pin. This mode allows
testing of the digital filters, but not the ADC and DAC.
Reducing Power-on Pop Noise
To minimize power-on pop during initialization, a waiting
period is recommended before powering up the analog
output drivers. The waiting period starts when the reset
signal to the Si3000 is negated. The wait time required
is dependent on the external load. Typically, the load
consists of an AC coupling capacitor in series with an
equivalent load resistor to ground. The equivalent load
resistor can either be a speaker load, or the input
resistance of an external amplifier. The rule-of-thumb for
the waiting period in msec is derived by C*(12+R). For
example, in the case of a 10 F AC coupling capacitor
and resistive load of 1.0 k
the recommended waiting
period is 10*(12+1) = 130 msec.
If the analog outputs drive external amplifiers, another
factor to consider is the voltage division ratio
determined by R/(R+12), where R represents the input
resistance of the external amplifier. This ratio must be
kept as small as possible. A good target value is R = 1
k . If needed, add a load resistor in parallel with the
amplifier input to lower the effective input resistance of
the amplifier stage.
Rev. 1.1
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