ST TS4657 User Manual

Single supply stereo digital audio line driver

Features

■ Single 3.0 to 5.5 V supply for DAC and line

driver

■ Audio line output: 2.2 Vrms for all V

■ 16- to 24-bit audio data format stereo DAC, 32

to 48 kHz sample rate

■ I²S, right- or left-justified compatible digital

audio interface

■ 95 dB SNR A-weighted at 48 kHz, V

■ 7.4 mA current consumption at V

full operation

■ Internal negative power supply to ensure

ground-referenced, capless outputs

■ No external capacitor needed for the negative

power supply generation

■ Integrated structure to suppress pop and click

noise

■ Available in thin QFN20 4 mm x 4 mm package

Applications

■ Digital set-top boxes

■ DVD players

■ Digital TVs

■ Notebooks

■ Portable audio equipment

■ Sound cards

CC

=3.0V,

CC

range

=5 V

TS4657

with 2.2 Vrms capless outputs

Pin connections (top view)

NC

VCCD

NC

VCCD

20

20162020

GNDD

1

GNDD

1511

NC

LRCLK

SDAT

5

55

BCLK

6

66

MCLK

FORMAT2

Description

The TS4657 is a stereo DAC that integrates a high-performance audio line driver capable of generating a 2.2 Vrms output level from a single

3.0 to 5.5 V supply.

One single supply is sufficient for the digital and analog parts of the circuit, thus eliminating the need for external regulators.

The TS4657 is a low-power consumption device. It features only 22 mW power dissipation at a

3.0 V power supply in full operation.

A 16-bit multi-bit sigma delta DAC is used, operating at 256xFs with oversampling digital interpolation filters. The digital audio data can be 16-to 24-bit long and sample rates from 32 to 48 kHz are supported.

GNDA

GNDD

GNDA

GNDD

VREGD

16

15

15111515

GNDA

VREGA

VCCA

VOUTL

VOUTR

11

1111

10

1061010

GNDA

STDBY

FORMAT1

The output stage signal is ground-referenced by using an internal self-generated negative power supply, and as such external bulky output coupling capacitors are not necessary.

The TS4657 is packaged in a small 4 x 4 mm QFN20 package, ideal for portable applications.

March 2009 Rev 1 1/26

www.st.com

26

Contents TS4657

Contents

1 Block diagram and pin description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

2 Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

3 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

3.1 Power characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

3.2 Package thermal characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

3.3 DAC and output stage performances . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

3.3.1 Terminology . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

3.4 Digital filter characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

3.4.1 DAC digital filter response . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

3.5 Electrical measurement curves . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

4 Application information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

4.1 Serial audio interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

4.1.1 Master clock and data clocks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

4.1.2 Digital audio input format . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

4.2 Power-management unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

4.3 Recommended power-up and power-down sequences . . . . . . . . . . . . . . 21

4.3.1 Power-up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

4.3.2 Power-down . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

5 Package information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

5.1 QFN20 package information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

6 Ordering information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

7 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

2/26

TS4657 Block diagram and pin description

1 Block diagram and pin description

Figure 1. Block diagram

VREGA

GNDA

VREGA

VOUTR

VOUTL

VREGD

DAC

GNDD

MCLK

BCLK

LRCLK

SDAT

FORMAT1

Table 1. Pin description

VCCA

Digital

Audio

Interface

Control

interface

FORMAT2

VCCD

Power

management unit

Digital

filters

STDBY

Pin name Pin I/O Function

GNDD 1 Supply Digital ground, connected to GND

NC 2

Non-connected pin

This pin must remain non-connected.

LRCLK 3 Digital input Channel select clock input

SDAT 4 Digital input Serial audio data input

BCLK 5 Digital input Bit clock input

MCLK 6 Digital input Master clock input

FORMAT2 7 Digital input Selection of the digital data audio format.

FORMAT1 8 Digital input Selection of the digital data audio format.

STDBY

9 Digital input

Input for Standby pin. STDBY shutdown mode.

=VIL: the TS4657 is in

GNDA 10 Supply Analog ground, connect to GND.

VOUTR 11 Analog output Right channel analog output

VOUTL 12 Analog output Left channel analog output

VCCA 13 Supply Main analog power supply, connected to VCCD

VREGA 14 Supply Decoupling pin for the analog part

GNDA 15 Supply Analog ground, connected to GND

GNDA 16 Supply Analog ground, connect to GND

GNDD 17 Supply Digital ground, connected to GND

VREGD 18 Supply Decoupling pin for the digital part

VCCD 19 Supply Main digital power supply. Connect to VCCA

NC 20

Non-connected pin

This pin must remain non-connected.

3/26

Block diagram and pin description TS4657

Figure 2. Typical application schematics

VCCA

VCCD

C3

2

nc20nc

Interface

Control

Interface

FORMAT18FORMAT2

7

123

JP2 Format2Format1 /Stdby

User Control

Digital

Audio

/STDBY

9

JP3

123

C2

1uF

C4

C5

1uF

14

Digital Filters

and

DACs

13

VCCA

18

IC1

VREGA

VREGD

12

VOUTL

11

VOUTR

C6

10K

R6

820

2nF2

R5

R7

C7

820

10K

R8

2nF2

SMB J7

J8 SMB

OUT L

OUT R

19

VCCD

TS4657

GNDD

GNDA

GNDA15GNDA

GNDD

1

Epad

10

16

17

Digital Input

SDAT

MCLK

LRCLK

BCLK

3v to 5V5

J3

J1

J5

VCC

1

J6

GND

1

J4

J2

VCCDVCCA

C1

R1

100KR2100KR3100KR4100K

Optional

10uF/6V3

VCCD

3

LRCLK

4

SDAT

5

BCLK

6

MCLK

123

JP1

Figure 3. Typical test schematics

Digital Input

LRCLK

SDAT

BCLK

MCLK

GND

J5

VCC

1

J6

1

J4

J3

J2

J1

VCCDVCCA

C1

R1

100KR2100KR3100KR4100K

10uF/6V3

VCCD

VCCA

VCCD

C3

C2

1uF

C4

C5

1uF

TS4657

GNDD

GNDA

GNDD

1

10

17

18

VREGD

GNDA15GNDA

16

1uF

14

VREGA

VOUTL

VOUTR

Epad

IC1

12

11

SMB J7

J8 SMB

OUT L

OUT R

2

19

13

nc20nc

VCCD

VCCA

3

LRCLK

4

SDAT

5

BCLK

6

MCLK

Control

Interface

FORMAT18FORMAT2

7

123

JP1

JP2 Format2Format1 /Stdby

Digital

Audio

Interface

/STDBY

9

123

JP3

Digital Filters

and

DACs

4/26

TS4657 Absolute maximum ratings

2 Absolute maximum ratings

Table 2. Key parameters and their absolute maximum ratings

Symbol Parameter Value Unit

(1)

5.5 V

GND to V

CC

T

R

V

T

CC

V

oper

stg

T

thja

Supply voltage

Digital input voltage

i

MCLK, BCLK, LRCLK, SDAT, FORMAT1, FORMAT2, STDBY

Operating free air temperature range -40 to + 85 °C

Storage temperature -65 to +150 °C

Maximum junction temperature 150 °C

j

Thermal resistance junction to ambient 100 °C/W

ESD Human body model 2 kV

ESD Machine model 200 V

Latch-up immunity Class A

Lead temperature (soldering, 10 secs) 260 °C

1. All voltage values are measured with respect to ground.

V

5/26

Electrical characteristics TS4657

3 Electrical characteristics

3.1 Power characteristics

Table 3. VCC = 3.3 V T = 25° C (unless otherwise specified)

Symbol Parameter Min. Typ. Max. Unit

V

Power supply 3.0 5.5 V

CC

Total supply current.

I

Full operation, R

CC

V

CC

=3.0V

=10KΩ, vstdby ≥ 2.0 V

L

VCC=5.0V

Standby current consumption. VCC= 3 V to VCC=5.5V

I

CCstby

Vstdby = 0 V Vstdby = 0.8 V

3.2 Package thermal characteristics

Table 4. Operating conditions

Symbol Parameter Min. Typ. Max. Unit

R

1. With heat sink surface = 125 mm2.

Thermal resistance junction to ambient for QFN20

thja

(1)

7.489.5

mA

9.8

25501000

nA

2000

40 °C/W

6/26

TS4657 Electrical characteristics

3.3 DAC and output stage performances

Table 5. VCC= 3.0 V to Vcc = 5.5 V, Rload = 10 kΩ Cload = 100 pF, T = 25° C

(unless otherwise specified)

Symbol Parameter Min. Typ. Max. Unit

Operating conditions

Audio data input format 16 24 bits

-

Fs Sampling frequency 32 48 kHz

R

C

Digital input characteristics

VIL Low-level input voltage 0.8 V

VIH High-level input voltage 2 V

Dynamic parameters

VoutRMS

Table 6. VCC= 3.3 V, Rload = 10 kΩ Cload = 100 pF, T = 25° C (unless otherwise specified)

Symbol Parameter Min. Typ. Max. Unit

Dynamic parameters

DR

SNR

THD+N

PSRR

LRiso Channel separation. 1 kHz, V

V

t

wu

Load resistor 5 10 kΩ

L

Load capacitance 100 150 pF

L

Full-scale output voltage swing

V

at 0 dBFS; R

in

≥ R

min; CL=100 pF 2.1 2.2

L

Dynamic range. A-weighted

16-bit data; V

Signal-to-noise ratio, F

at -60 dBFS, FS=48kHz, Fin= 1 kHz 88 93

in

=48kHz, Fin= 1 kHz, referred to

S

output

at -6 dBFS; A-weighted, 18-bit data input

V

in

Vin at -6 dBFS; unweighted, 18-bit data input

at 0 dBFS; A-weighted, 16-bit data input

V

in

89 87 87

94.5

92.5 93

Total harmonic distortion and noise. Fin = 1 kHz

V

at -20 dBFS, 18-bit data input

in

V

at -6 dBFS, 18-bit data input

in

at 0 dBFS, 16-bit data input

V

in

74

72 82 81

Power supply rejection ratio, Vripple = 200 mVpp

F= 217 Hz F= 1 kHz 20 Hz < F < 20 kHz

at 0 dBFS 100 dB

in

Output offset voltage -20 20 mV

oo

80 71 46

Gain channel balance -0.2 0.01 0.2 dB

Wake-up time 4.5 ms

Vrms

dB

7/26

Electrical characteristics TS4657

Table 7. V

Symbol Parameter Min. Typ. Max. Unit

=5V, Rload=10kΩ, Cload = 100 pF, T = 25° C (unless otherwise specified)

CC

DR

Dynamic range; A-weighted 16-bit data; measured at -60 dBFS, F

Signal-to-noise ratio, F

=48kHz, Fin= 1 kHz, referred to

S

=48kHz, Fin= 1 kHz 88 93

S

output

SNR

at -6 dBFS; A-weighted, 18-bit data input

V

in

Vin at -6 dBFS; unweighted, 18-bit data input Vin at 0 dBFS; A-weighted, 16-bit data input

89 95

93 93

Total harmonic distortion and noise. Fin = 1 kHz

THD+N

at -20 dBFS

V

in

at -6 dBFS

V

in

Vin at 0 dBFS

74

72

82.5

81.5

Power supply rejection ratio, Vripple = 200 mVpp

PSRR

F= 217 Hz F= 1 kHz 20 Hz < F < 20 kHz

80 73 48

LRiso Channel separation. 1 kHz, Vin at 0 dBFS 100 dB

V

Output offset voltage -20 20 mV

oo

Gain channel balance -0.2 0.01 0.2 dB

t

wu

1. See timing diagram in application information.

Wake-up time

(1)

34.56ms

3.3.1 Terminology

dB

SNR: signal-to-noise ratio is expressed in dB. The theoretical formula is:

2

VH

⎛⎞

1

-------------------

10

log=

⎜⎟ ⎝⎠

V

noise

2

where V

SNR

dB

is the integrated noise from 20 Hz to 20 kHz and VH1 is the fundamental of the

noise

signal.

For unweighted measurements, the SNR is given by:

2

VH

uf()v

1

noise

2

f()()

fd

where v

SNR

dB

is the noise spectral density and u(f) is the unweighted filter transfer function

noise

----------------------------------------------------------------------

10

log=

20k Hz

∫

20H z

(20 Hz, 20 kHz).

For A-weighted measurements:

2

VH

Af()v

1

noise

2

f()()

fd

where v

SNR

dB

A

is the noise spectral density and A(f) is the A-weighted filter transfer function.

noise

---------------------------------------------------------------------- -

10

log=

20k Hz

∫

20H z

8/26