1FEATURES
23· One-Chip Digital Audio Interface Receiver
(DIR) Including Low-Jitter Clock-Recovery
System
· Compliant With Digital Audio Interface
Standards: IEC60958 (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

APPLICATIONS
· Car Audio Head Units
· Car Audio External Amplifiers

DESCRIPTION
The DIR9001-Q1 is a digital audio interface receiver
that can receive a 28-kHz to 108-kHz sampling-
frequency, 24-bit-data-word, biphase-encoded signal.
The DIR9001-Q1 complies with IEC60958-3, JEITA
CPR-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-Q1 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-Q1 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, etc.
The DIR9001-Q1 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-Q1
is specified as –40°C to 85°C, which makes it suitable for automotive applications.