1 Features
1• One-Chip Digital Audio Interface Receiver (DIR)
Including Low-Jitter Clock-Recovery System
• Compliant With Digital Audio Interface Standards: CPRIEC60958
(former IEC958), JEITA CPR-1205
(former EIAJ CP-1201, CP-340), AES3, EBU
tech3250
• Clock Recovery and Data Decode From Biphase
Input Signal, Generally Called S/PDIF, EIAJ CP-
1201, IEC60958, AES/EBU
• Biphase Input Signal Sampling Frequency (fS)
Range: 28 kHz to 108 kHz
• Low-Jitter Recovered System Clock: 50 ps
• Jitter Tolerance Compliant With IEC60958-3
• Selectable Recovered System Clock: 128 fS,
256 fS, 384 fS, 512 fS
• Serial Audio Data Output Formats: 24-Bit I2S;
MSB-First, 24-Bit Left-Justified; MSB-First 16-, 24-
Bit Right-Justified
• User Data, Channel-Status Data Outputs
Synchronized With Decoded Serial Audio Data
• No External Clock Required for Decode
• Includes Actual Sampling Frequency Calculator
(Needs External 24.576-MHz Clock)
• Function Control: Parallel (Hardware)
• Functions Similar and Pin Assignments Equivalent
to Those of DIR1703
• Single Power Supply: 3.3 V (2.7 V to 3.6 V)
• Wide Operating Temperature Range: –40°C to
85°C
• 5 V-Tolerant Digital Inputs
• Package: 28-pin TSSOP, Pin Pitch: 0,65 mm

2 Applications
• AV/DVD Receiver, AV Amplifier
• Car or Mobile Audio System
• Digital Television
• Musical Instruments
• Recording Systems
• High-End Audio/Sound Card for PC
• Replacement of DIR1703
• Other Applications Requiring S/PDIF Receiver

3 Description
The DIR9001 is a digital audio interface receiver that
can receive a 28-kHz to 108-kHz samplingfrequency,
24-bit-data-word, biphase-encoded signal.
The DIR9001 complies with IEC60958-3, JEITA CPRIEC60958
1205 (Revised version of EIAJ CP-1201), AES3,
EBUtech3250, and it can be used in various
applications that require a digital audio interface.
The DIR9001 supports many output system clock and
output data formats and can be used flexibly in many
application systems. As the all functions which the
DIR9001 provides can be controlled directly through
control pins, it can be used easily in an application
system that does not have a microcontroller. Also, as dedicated pins are provided for the channel-status bit
and user-data bit, processing of their information can
be easily accomplished by connecting with a
microcontroller, DSP, or others.
The DIR9001 does not require an external clock
source or resonator for decode operation if the
internal actual-sampling-frequency calculator is not
used. Therefore, it is possible to reduce the cost of a
system.
The operating temperature range of the DIR9001 is
specified as –40°C to 85°C, which makes it suitable for automotive applications.