IDTSTAC9251H5TAEA1XR IDT, Integrated Device Technology Inc, IDTSTAC9251H5TAEA1XR Datasheet - Page 16

• Manufacturer Part Number: IDTSTAC9251H5TAEA1XR
• Description: IC AUDIO CODEC 2CH HD 5V 48-LQFP
• Manufacturer: IDT, Integrated Device Technology Inc
• Type: Audio Codec, HDr

Specifications of IDTSTAC9251H5TAEA1XR

• Resolution (bits): 24 b
• Number Of Adcs / Dacs: 2 / 2
• Sigma Delta: Yes
• S/n Ratio, Adcs / Dacs (db) Typ: 89 / 100
• Dynamic Range, Adcs / Dacs (db) Typ: 88 / 99
• Voltage - Supply, Analog: 3.14 V ~ 3.47 V; 3.8 V ~ 4.2 V; 4.75 V ~ 5.25 V
• Voltage - Supply, Digital: 3.14 V ~ 3.47 V
• Operating Temperature: 0°C ~ 70°C
• Mounting Type: Surface Mount
• Package / Case: 48-LQFP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: STAC9251H5TAEA1XR

3. DETAILED DESCRIPTION
IDT™
TWO-CHANNEL HD AUDIO CODEC WITH MODEM & DUAL DIGITAL MICROPHONE INTERFACES
STAC9250/9251
TWO-CHANNEL HD AUDIO CODEC WITH MODEM & DUAL DIGITAL MICROPHONE INTERFACES
3.1.
3.2.
3.3.
3.4.
3.5.
SPDIF Input
SPDIF Output
Digital Microphone Support (STAC9251 only)
SiLabs System Side Modem
Mono Out
SPDIF IN can operate at 44.1 KHz or 96 KHz, and implements internal Jack Sensing. A sophisti-
cated digital PLL allows automatic rate detection and accurate data recovery. The ability to directly
accept consumer SPDIF voltage levels eliminates the need for costly external receiver ICs.
Advanced features such as record slot select and SPDIF_IN routing to the DAC allows for simulta-
neous record and play.
SPDIF OUT can operate at 44.1 KHz, 48 KHz, 88.2 KHz, and 96 KHz, as defined in the Intel High
Definition Audio Specification, with resolutions up to 24 bits. This insures compatibility with all con-
sumer audio gear and allows for convenient integration into home theater systems and media center
PCs.
The STAC9251 has a three-pin digital microphone interface that accepts high-rate, single-bit data
streams from two digital microphones. Each microphone requires only one data line. Both micro-
phones share a single clock line. This robust digital interface gives designers the flexibility to place
the microphones in the optimum location on a system (such as along the top of the screen bezel)
and use a simple, 3-wire ribbon cable to directly connect the microphones to the STAC9251
CODEC.
A licensed Silicon Labs System Side modem based on the Si3054 architecture is integrated into
STAC9250/9251. Combined with a Silicon Labs Line Side IC (Si3080 or similar), the STAC9250/
9251 allows designers to implement a two-chip HD Audio and HD Modem solution for significant
cost and board space savings.
The MONO Output is connected to pin 37 and has independent volume and mute control (see the
Widget listing for details). The MONO Output derives it’s input from the output of the summing node
that drives PORT A and PORT D. The following analog signals feed the summing amplifier that
feeds the MONO Out summing amplifier:
•
•
•
The combination of the stereo channels from DAC are combined into a single analog signal with a
-6dB degradation in signal strength.
DAC Output: When enabled, both DAC Outputs are summed together.
Analog PC Beep: Source from Pin 12
ADC Input: Stereo analog feed into the stereo ADC input.
16
STAC9250/9251
PC AUDIO
V 1.2 01/08