SI3000-KS Silicon Laboratories Inc, SI3000-KS Datasheet - Page 14

• 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

S i3 00 0
Functional Description
The Si3000 is a highly integrated voice bandwidth audio
codec which contains a single 16-bit A/D converter and
D/A converter. The analog input path contains a
microphone input with selectable gain, a line level input
with selectable gain, and a handset input. Each of the
inputs go through a mixer prior to A/D conversion. The
result of this A/D conversion is a 16-bit signed number.
Following the A/D converter is a digital programmable
gain amplifier. The analog output path contains a digital
programmable gain amplifier feeding a single 16-bit D/A
converter. The DAC output is provided to a line output, a
headphone drive output, and a handset output. Control
for the various functions available on the Si3000 as well
as the audio data are communicated to the device over
a serial interface.
The Si3000 can be connected directly to the Si3035,
Si3034, Si3044 in modem applications requiring a voice
channel, or the device can be used as a stand-alone
codec in other voice band applications. The Si3000
offers high integration, and it needs only a few low cost,
discrete components as shown in Figure 13.
Analog Inputs
The typical connection diagram (Figure 13) shows the
recommended external analog circuitry for the Si3000.
The device supports three mono analog inputs—line
level, microphone level, and a handset input. Each of
these inputs is provided to a mixer circuit prior to A/D
conversion. Each analog input may also be muted by
writing the appropriate bits in the control registers.
Unused analog inputs should be tied to GND through a
0.1 F capacitor. This prevents any DC current flow.
14
DSP
Figure 14. Si3000 with Silicon Labs DAA System Diagram
Si3021 DAA
Si3000
Voice Codec
(Master)
Si3034/35/44 Chipsets
Rev. 1.1
Pre-amp/Microphone Bias Circuit
An internal amplifier with a selectable gain of 0 dB,
10 dB, 20 dB, or 30 dB is provided for the MIC input and
an internal amplifier with a selectable gain of 0 dB,
10 dB, or 20 dB, is provided for the LINEI input. AC
coupling is required for both inputs because any DC
offset on the input will be amplified if gain is selected.
Gain settings for the LINEI and MIC inputs are achieved
by writing the RX Gain Control 1 register 5. When gain
is disabled, these inputs become line level inputs with a
full scale input of 1 Vrms.
A microphone bias circuit is provided on-chip which
consists of a 2.5 V reference output capable of sourcing
up to 5 mA of current. This circuit can be used for active
microphones requiring a bias source.
Programmable Input Gain/Attenuation
The signals from the microphone, line, or handset
inputs are mixed and then routed to the A/D converter
and a digital programmable gain circuit which provides
up to 12 dB of gain or –34.5 dB of attenuation in 1.5 dB
steps. Level changes only take effect on zero crossings
to minimize audible artifacts. The requested level
change is implemented if no zero crossing is found after
256 frames. Write the ADC Volume Control register 6 to
set digital input gain/attenuation.
Analog Outputs
The analog outputs of the D/A converter are routed to a
line level output (LINEO), a pair of speaker outputs
(SPKRL and SPKRR), and a handset. Each analog
output can be independently muted.
Si3012 DAA
or
Si3014 DAA
or
Si3015 DAA
SPKR
Line
Discretes
Mic
Handset
TIP
RING