Philips UDA1350AH Datasheet

INTEGRATED CIRCUITS

DATA SH EET

UDA1350AH

IEC 958 audio DAC

Product speciﬁcation Supersedes data of 1999 Dec 16 File under Integrated Circuits, IC01

2000 Sep 07

Philips Semiconductors Product speciﬁcation

IEC 958 audio DAC UDA1350AH

CONTENTS

1 FEATURES

1.1 General

1.2 Control

1.3 IEC 958 input

1.4 Digital output and input interfaces

1.5 Digital sound processing and DAC 2 APPLICATIONS 3 GENERAL DESCRIPTION 4 QUICK REFERENCE DATA 5 ORDERING INFORMATION 6 BLOCK DIAGRAM 7 PINNING 8 FUNCTIONAL DESCRIPTION

8.1 Operating modes

8.2 Clock regeneration and lock detection

8.3 Mute

8.4 Auto mute

8.5 Data path

8.5.1 IEC 958 input

8.5.2 SPDIF selection procedure

8.5.3 Digital data output and input interface

8.5.4 Audio feature processor

8.5.5 Interpolator

8.5.6 Noise shaper

8.5.7 Filter stream DAC

8.6 Control

8.6.1 Static pin control mode

8.6.2 L3 control mode

8.7 L3 interface

8.7.1 General

8.7.2 Device addressing

8.7.3 Register addressing

8.7.4 Data write mode

8.7.5 Data read mode

8.7.6 Initialization string

8.7.7 Overview of L3 interface registers

8.7.8 Writable registers

8.7.9 Readable registers

9 LIMITING VALUES 10 THERMAL CHARACTERISTICS 11 CHARACTERISTICS 12 TIMING CHARACTERISTICS 13 APPLICATION INFORMATION 14 PACKAGE OUTLINE 15 SOLDERING

15.1 Introduction to soldering surface mount packages

15.2 Reflow soldering

15.3 Wave soldering

15.4 Manual soldering

15.5 Suitability of surface mount IC packages for wave and reflow soldering methods

16 DATA SHEET STATUS 17 DEFINITIONS 18 DISCLAIMERS

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Philips Semiconductors Product speciﬁcation

IEC 958 audio DAC UDA1350AH

1 FEATURES

1.1 General

• 2.7 to 3.6 V power supply

• Integrated digital filter and Digital-to-Analog Converter

(DAC)

• Master-mode data output interface for off-chip sound processing

• 256fssystem clock output

• 20-bit data-path in interpolator

• High performance

• No analog post filtering required for DAC.

1.2 Control

• Controlled either by means of static pins or via the L3 microcontroller interface.

1.3 IEC 958 input

• On-chip amplifierfor converting IEC 958 input to CMOS levels

• Selectable IEC 958 input channel, one out of two

• Lock indication signal available on pin LOCK

• Lock indication signal combined on-chip with the Pulse

Code Modulation (PCM) status bit; in case non-PCM has been detected pin LOCK indicates out-of-lock

• Key channel-status bits available via L3 interface (lock, pre-emphasis, audio sample frequency, two channel PCM indication and clock accuracy).

1.4 Digital output and input interfaces

• When the UDA1350AH is clock master of the data output interface:

– BCKO and WSO signals are output –I2S-bus or LSB-justified 16, 20 and 24 bits formats

are supported.

• When the UDA1350AH is clock slave of the data input interface:

– BCK and WS signals are input –I2S-bus or LSB-justified 16, 20 and 24 bits formats

are supported.

1.5 Digital sound processing and DAC

• Pre-emphasis information of IEC 958 input bitstream available in L3 interface register and on pins

• Automatic de-emphasis when using IEC 958 input with

32.0, 44.1 and 48.0 kHz audio sample frequencies

• Soft mute by means of a cosine roll-off circuit selectable via pin MUTE or the L3 interface

• Interpolating filter (fsto 128fs) by means of a cascade of a recursive filter and a FIR filter

• Third-order noise shaper operating at 128fs generates bitstream for the DAC

• Filter stream digital-to-analog converter.

2 APPLICATIONS

• Digital audio systems.

3 GENERAL DESCRIPTION

The UDA1350AH is a single chip IEC 958 audio decoder with an integrated stereo digital-to-analog converter employing bitstream conversion techniques.

BesidestheUDA1350AH, which is the full featuredversion in QFP44 package, there also exists the UDA1350ATS. The UDA1350ATS has IEC 958 input to the DAC only and is in SSOP28 package.

The UDA1350AH can operate in various operating modes:

• IEC 958 input to the DAC including on-chip signal processing

• IEC 958 input via the digital data output interface to the external Digital Signal Processor (DSP)

• IEC 958 input to the DAC and a DSP

• IEC 958 input via a DSP to the DAC including on-chip

signal processing

• External source data input to the DAC including on-chip signal processing.

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Philips Semiconductors Product speciﬁcation

IEC 958 audio DAC UDA1350AH

The IEC 958 input audio data including the accompanying pre-emphasis information is available on the output data interface.

By default the DAC output and the data output interface are muted when the decoder is out-of-lock. However, this setting can be overruled in the L3 control mode.

Alock indication signalis available onpin LOCK indicating that the IEC 958 decoder is locked.

4 QUICK REFERENCE DATA

SYMBOL PARAMETER CONDITIONS MIN. TYP. MAX. UNIT

Supplies

DDA

DDD

DDA(DAC)

analog supply voltage 2.7 3.0 3.6 V digital supply voltage 2.7 3.0 3.6 V analog supply current of DAC power-on − 8.0 − mA

power-down − 750 −µA

DDA(PLL)

DDD

DDD(C)

analog supply current of PLL − 0.7 − mA digital supply current − 2.0 − mA digital supply current of core − 16.0 − mA

P power consumption DAC in playback mode − 80 − mW

DAC in Power-down mode − 58 − mW

General

rst

amb

reset active time − 250 −µs ambient temperature −40 − +85 °C

Digital-to-analog converter

o(rms)

(THD + N)/S total harmonic distortion-plus-noise to

output voltage (RMS value) note 1 − 900 − mV

= 1.0 kHz tone

signal ratio

at 0 dB −−90 −85 dB at −40 dB; A-weighted −−60 −55 dB

S/N signal-to-noise ratio f

= 1.0 kHz tone;

95 100 − dB

code = 0; A-weighted

α ∆V

channel separation fi= 1.0 kHz tone − 96 − dB unbalance of output voltages fi= 1.0 kHz tone − 0.1 0.4 dB

Note

1. The DAC output voltage is proportional to the DAC power supply voltage.

5 ORDERING INFORMATION

TYPE

NUMBER

NAME DESCRIPTION VERSION

PACKAGE

UDA1350AH QFP44 plastic quad ﬂat package; 44 leads (lead length 1.3 mm);

body 10 × 10 × 1.75 mm

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Philips Semiconductors Product speciﬁcation

IEC 958 audio DAC UDA1350AH

6 BLOCK DIAGRAM

handbook, full pagewidth

DDA(PLL)

SSA(PLL)

TEST1

DDD(C)

SSD(C)

L3MODE

L3CLOCK

L3DATA

SELSTATIC

SPDIF0 SPDIF1

SELCHAN

DDD

SSD

32 31

6 5

15 16

43 3

CLKOUT

CLOCK

AND

TIMING CIRCUIT

INTERFACE

SLICER

11, 14, 28, 38, 40, 41

n.c.

IEC 958

DECODER

PREEM1

LOCK

PREEM0

TEST2

DATA

OUTPUT

INTERFACE

BCKO

RTCB

UDA1350AH

DATAO

WSO

SSA

DATAI

DDA

BCKI

DDA(DAC)

VOUTL

AUDIO FEATURE PROCESSOR

SELCLK

WSI

DAC

NOISE SHAPER

INTERPOLATOR

SELSPDIF

SSA(DAC)

ref

VOUTR

DAC

DATA

INPUT

INTERFACE

MGS750

MUTE

RESET

Fig.1 Block diagram.

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Philips Semiconductors Product speciﬁcation

IEC 958 audio DAC UDA1350AH

7 PINNING

SYMBOL PIN TYPE

(1)

DESCRIPTION

RESET 1 DISD reset input V

DDD(C)

SSD

SSD(C)

2 DS digital supply voltage for core 3 DGND digital ground

4 DGND digital ground for core L3DATA 5 DIOS L3 interface data input and output L3CLOCK 6 DIS L3 interface clock input DATAI 7 DISD I BCKI 8 DISD I WSI 9 DISD I

S-bus data input

S-bus bit clock input

S-bus word select input L3MODE 10 DIS L3 interface mode input n.c. 11 − not connected MUTE 12 DID mute control input SELCHAN 13 DID IEC 958 channel selection input n.c. 14 − not connected SPDIF0 15 AI IEC 958 channel 0 input SPDIF1 16 AI IEC 958 channel 1 input V

DDA(DAC)

17 AS analog supply voltage for DAC VOUTL 18 AO DAC left channel analog output SELCLK 19 DID clock source for PLL selection input SELSPDIF 20 DIU IEC 958 data selection input LOCK 21 DO SPDIF and PLL lock indicator output VOUTR 22 AO DAC right channel analog output TC 23 DID test pin; must be connected to digital ground (V V

ref

SSA(DAC)

SSA

DDA

24 A DAC reference voltage

25 AGND analog ground for DAC

26 AGND analog ground

27 AS analog supply voltage

SSD

)

n.c. 28 − not connected CLKOUT 29 DO clock output (256f

)

PREEM1 30 DO IEC 958 input pre-emphasis output 1 V

SSA(PLL)

DDA(PLL)

BCKO 33 DO I

31 AGND analog ground for PLL

32 AS analog supply voltage for PLL

S-bus bit clock output TEST1 34 DIU test pin 1: must be connected to digital supply voltage (V SELSTATIC 35 DIU static pin control selection input DATAO 36 DO I WSO 37 DO I

S-bus data output

S-bus word select output n.c. 38 − not connected TEST2 39 DISD test pin 2; must be connected to digital ground (V

SSD

)

n.c. 40 − not connected

DDD

)

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Philips Semiconductors Product speciﬁcation

IEC 958 audio DAC UDA1350AH

SYMBOL PIN TYPE

(1)

DESCRIPTION

n.c. 41 − not connected PREEM0 42 DO IEC 958 input pre-emphasis output 0 V

DDD

43 DS digital supply voltage

RTCB 44 DID test pin; must be connected to digital ground (V

Note

1. See Table 1.

Table 1 Pin type references

PIN TYPE DESCRIPTION

DS digital supply DGND digital ground AS analog supply AGND analog ground DI digital input DIS digital Schmitt-triggered input DID digital input with internal pull-down resistor DISD digital Schmitt-triggered input with internal pull-down resistor DIU digital input with internal pull-up resistor DO digital output DIO digital input and output DIOS digital Schmitt-triggered input and output A analog reference voltage AI analog input AO analog output

SSD

)

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Philips Semiconductors Product speciﬁcation

IEC 958 audio DAC UDA1350AH

handbook, full pagewidth

DDD

RTCB

V 43

PREEM0

n.c.

n.c. 40

n.c.

TEST2 39

WSO 37

DATAO

SELSTATIC

TEST1 34

RESET

DDD(C)

SSD

SSD(C)

L3DATA

L3CLOCK

DATAI

BCKI

WSI

L3MODE

n.c.

VOUTR

33 32 31 30 29 28 27 26 25 24 23

MGS751

BCKO V

DDA(PLL)

SSA(PLL)

PREEM1 CLKOUT n.c.

DDA

SSA

SSA(DAC)

ref

1 2 3 4 5 6 7 8

9 10 11

MUTE

SELCHAN

UDA1350AH

n.c.

SPDIF0

SPDIF1

DDA(DAC)

VOUTL

SELCLK

LOCK

SELSPDIF

Fig.2 Pin configuration.

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Philips Semiconductors Product speciﬁcation

IEC 958 audio DAC UDA1350AH

8 FUNCTIONAL DESCRIPTION

8.1 Operating modes MODE DESCRIPTION SCHEMATIC

1 IEC 958 input to the DAC

input

IEC 958

DAC

CLOCK

2 IEC 958 input via the data

output interface to the DSP

3 IEC 958 input to the DAC and

via the data output interface to the DSP

4 IEC 958 input via the data

output interface to the external DSP and via the data input interface to the DAC

input

IEC 958

input

IEC 958

input

IEC 958

CLOCK

DSP

MGS758

MGS759

DAC

MGS760

DAC

MGS761

5 Data input interface signal to

the DAC

DSP

DAC

MGS762

The UDA1350AH is a low cost multi-purpose IEC 958 decoder DAC with a variety of operating modes. In modes 1, 2, 3 and 4 the UDA1350AH isclock master; it generates the clock for both the outgoing andincoming digital

data streams. Consequently, any device providing data for the UDA1350AH via the data input interfacein mode 4will be slave to the clock generated by the UDA1350AH.

In mode 5 the UDA1350AH locks to signal WSI from the digital data input interface. Conforming to IEC 958, the audio sample frequency of the data input interface must be between 28.0 and 54.0 kHz.

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Philips Semiconductors Product speciﬁcation

IEC 958 audio DAC UDA1350AH

8.2 Clock regeneration and lock detection

The UDA1350AH contains an on-board PLL for regenerating a system clock from the IEC 958 input bitstream or the incoming digital data stream via the data input interface. In addition to the system clock for the on-board digital sound processing the PLL also generates a 256fsclock output for use in the application. In the absence of an input signal the clock will generate a minimum frequency to warrant system functionality.

When the on-board clock has locked to the incoming frequency the lock indicator bit will be set and can be read via the L3 interface. Internally the PLL lock indication is combined with thePCM status bitof the input data stream. When both the IEC 958 decoder and the on-board clock have locked to the incoming signal and the input data stream is PCM data, then pin LOCK will be asserted. However, when the IC is locked but the PCM status bit reports non-PCM data then pin LOCK is returned to LOW level.

The lock indication output can be used, for example, for muting purposes using an external analog mute circuit. An example is given in Fig.3 where VDD is the positive power supply and VSS is the negative power supply.

8.3 Mute

The UDA1350AH isequipped with a cosine roll-off mute in the DSP data path of the DAC part. Muting the DAC, by pin MUTE (in static mode) or via bit MT (in L3 mode) will result in a soft mute as presented in Fig.4. The cosine roll-off soft mute takes 32 × 32 samples = 24 ms at a sampling frequency of 44.1 kHz.

When operating in the L3 control mode the device will mute on start-up. In L3 mode it is necessary to explicitly switch off themute for audiooutput by means of theMT bit in the L3 register.

In the L3 mode pin MUTE does not have any function (the same holds for several other pins) and can either be left open-circuit (since it has an internal pull-down resistor) or be connected to ground.

LOCK

VOUTL

VOUTR

MBL212

handbook, halfpage

UDA1350AH

DAC

LEFT

DAC

RIGHT

Fig.3 Example of external analog mute circuit.

handbook, halfpage

mute

factor

0.8

0.6

0.4

0.2

01 3

MGS755

t (ms)

Fig.4 Mute as a function of raised cosine roll-off.

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Philips Semiconductors Product speciﬁcation

IEC 958 audio DAC UDA1350AH

8.4 Auto mute

By default the outputs of the digital data output interface and the DAC will be muted until the IC is locked, regardless the level on pin MUTE (in static mode) or the state of bit MT of the sound feature register (in L3 mode). In this way only valid data will be passed to the outputs. This mute is done in the SPDIF interface and is a hard mute, not a cosine roll-off mute.

If needed this muting can be bypassed by setting bit AutoMTto logic 0 via theL3 interface. As a resulttheIC will no longer mute during out-of-lock situations.

8.5 Data path

The UDA1350AH data path consists of the slicer and the IEC 958 decoder, the digital data output and input interfaces, the audio feature processor, digital interpolator and noise shaper and the digital-to-analog converters.

8.5.1 IEC 958 INPUT

The UDA1350AH IEC 958 decoder can select one out of two IEC 958 input channels. An on-chip amplifier with hysteresis amplifies the IEC 958 input signal to CMOS level (see Fig.5).

handbook, halfpage

15, 16

UDA1350AH

MGS873

75 Ω

10 nF

180 pF

SPDIF0, SPDIF1

Fig.5 IEC 958 input circuit and typical application.

All 24 bits of data for left and right are extracted from the input bitstream as well as several of the IEC 958 key channel-status bits.

Both the lock indicator and the key channel status bits are accessible via the L3 interface.

The UDA1350AH supports the following sample frequencies and data bit rates:

• fs= 32.0 kHz, resulting in a data rate of 2.048 Mbits/s

• fs= 44.1 kHz, resulting in a data rate of 2.8224 Mbits/s

• fs= 48.0 kHz, resulting in a data rate of 3.072 Mbits/s.

The UDA1350AH supports timing level I, II and III as specified by the IEC 958 standard.

8.5.2 SPDIF SELECTION PROCEDURE

WARNING

At switching between the two SPDIF inputs, the switching inside the UDA1350AH is done instantly. It may occur that SPDIF words inside the SPDIF decoder of the UDA1350AH get corrupted. When no action is taken, corrupted data can reach the FSDAC output.

In order to prevent noise at the FSDAC output when switching between the SPDIF inputs, the following procedures are recommended. This procedure uses an external analog mute circuit as shown in Fig.3.

• Static mode: – Activate the external analog mute circuit – Select the proper SPDIF input signal – Activate pin RESET to reset thePLL settingsand the

PLL will synchronize again to the new input signal

– De-activate the external analog mute circuit.

• L3 mode: – Activate the external analog mute circuit – Select the proper SPDIF input signal via the

L3 interface

– Toggle bit RST_PLL of the L3 interface to reset the

PLL and the PLL will synchronize again to the new input signal

– De-activate the external analog mute circuit.

The extracted key parameters are:

• Pre-emphasis

• Audio sample frequency

• Two-channel PCM indicator

• Clock accuracy.

2000 Sep 07 11

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