Clock and Data Recovery

SCKO

BCKO

LRCKO

DOUT

RXIN

Divider

FILT

XTO

XTI

FSOUT0

FSOUT1

RST

OSC

RESET

CLKST

EMPH

UOUT

COUT

BFRAME

VCO

CKSEL

DGND

ERROR

AUDIO

Power Supply

V

DD

DGND

AGND

V

CC

PSCK0

PSCK1

FMT0

RSV

PLL

Divider

Decoder

FMT1

Preamble

Detector

Charge

Pump

Sampling

Frequency

Calculator

Clock

Decoder

Biphase

Data Decoder

Serial

AudioData

Formatter

ERROR

Detector

Function

Control

AudioData

MUTE Control

Channel Status

and

UserData

Output

DIR9001

www.ti.com

SLES198A – DECEMBER 2006 – REVISED MAY 2015

8 Detailed Description

8.1 Overview

The DIR9001 is a digital audio interface receiver that can receive a 28-kHz to 108-kHz sampling frequency, 24-

bit-data-word, biphase-encoded signal and output a serial audio signal. The DIR9001 complies with the jitter

specification IEC60958-3, JEITA CPR1205 (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 MSB-first PCM data output in 24-bit I2S, 24-bit left justified, 24-bit right justified, or 16-bit

right justified form. Sampling rates of 32 kHz, 44.1 kHz, 48 kHz, 88.2 kHz, and 96 kHz are supported on the

serial audio data output when in PLL mode. All functions which the DIR9001 provides can be controlled directly

through control pins. This means that they can be pulled high or low for full operation of the DIR9001 without a

microcontroller. A microcontroller can also be used to drive the function pins to provide an adaptable system.

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, and so on.

The DIR9001 can derive a system clock by recovering the source’s clock from the biphase input signal.

Therefore, the DIR9001 does not require an external clock source or resonator for decode operation if the

internal actual-sampling-frequency calculator is not used which in turn can reduce the system cost. The serial

audio data output can also be driven by an external source such as a crystal or ceramic resonator.

The operating temperature range of the DIR9001 is specified as –40°C to 85°C, which makes it suitable for

automotive applications.

8.2 Functional Block Diagram

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Product Folder Links: DIR9001