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Advanced Information, July 2000, Rev 1.7

Lutton Court, Bernard Terrace, Edinburgh, EH8 9NX, UK
Tel: +44 (0) 131 667 9386
Fax: +44 (0) 131 667 5176
Email: sales@wolfson.co.uk
http://www.wolfson.co.uk

Advanced Information data sheets contain

preliminary data on new products in the

preproduction phase of development.

Supplementary data will be published at a

later date.



2000 Wolfson Microelectronics Ltd

.

The WM8740 is a very high performance stereo DAC
designed for audio applications such as CD, DVD, home
theatre systems, set top boxes and digital TV. The WM8740
supports data input word lengths from 16 to 24-bits and
sampling rates up to 192kHz. The WM8740 consists of a
serial interface port, digital interpolation filter, multi-bit sigma
delta modulator and stereo DAC in a small 28-pin SSOP
package. The WM8740 also includes a digitally controllable
mute and attenuator function on each channel.

The internal digital filter has two selectable roll-off
characteristics. A sharp or slow roll-off can be selected
dependent on application requirements. Additionally, the
internal digital filter can be by-passed and the WM8740
used with an external digital filter.

The WM8740 supports two connection schemes for audio
DAC control. The SPI-compatible serial control port
provides access to a wide range of features including on-
chip mute, attenuation and phase reversal. A hardware
controllable interface is also available.

•

 

120dB SNR (‘A’ weighted mono @48kHz), THD+N: -104dB
@ FS

•

 

117dB SNR (‘A’ weighted stereo @48kHz), THD+N: -104dB
@ FS

•

 

Sampling frequency: 8kHz to 192kHz

•

 

Selectable digital filter roll-off

•

 

Optional interface to industry standard external filters

•

 

Differential mono mode needing no glue logic

•

 

Input data word: 16 to 24-bit

•

 

Hardware or SPI compatible serial port control modes:

•

 

Hardware mode: mute, de-emphasis, audio format
control

•

 

Serial mode: mute, de-emphasis, attenuation (256
steps), phase reversal

•

 

Fully differential voltage outputs

•

 

CD, DVD audio

•

 

Home theatre systems

•

 

Professional audio systems

15

DS39663A-page 2

¤

 2005 Microchip Technology Inc.

PIC18F65J10

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1
2
3
4
5
6
7
8
9
10
11
12
13
14

38
37
36
35

34
33

50

49

17

18

19

20

21

22

23

24

25

26

RE2

/CS

/P

2B

RE3

/P

3

C

RE4

/P

3

B

RE5

/P

1

C

RE6

/P

1

B

RE7

/E

CCP2

/P

2A

RD0

/PS

P

0

V

DD

V

SS

RD1

/PS

P

1

RD2

/PS

P

2

RD3

/PS

P

3

RD4

/P

S

P

4

/S

D

O2

RD5

/P

S

P

5

/S

D

I2/S

DA

2

RD6

/PS

P

6

/SCK2

/SCL

2

RD7

/PS

P

7

/SS2

RE1/WR/P2C

RE0/RD/P2D

RG0/ECCP3/P3A

RG1/TX2/CK2

RG2/RX2/DT2

RG3/CCP4/P3D

MCLR

RG4/CCP5/P1D

V

SS

V

DDCORE

/V

CAP

RF7/SS1

RF6/AN11

RF5/AN10/CV

REF

RF4/AN9
RF3/AN8

RF2/AN7/C1OUT

RB0/INT0/FLT0
RB1/INT1

RB2/INT2
RB3/INT3
RB4/KBI0
RB5/KBI1
RB6/KBI2/PGC
V

SS

OSC2/CLKO
OSC1/CLKI
V

DD

RB7/KBI3/PGD

RC4/SDI1/SDA1
RC3/SCK1/SCL1
RC2/ECCP1/P1A

ENVREG

RF

1

/AN6

/C2

OUT

AV

DD

AV

SS

RA3

/AN3

/V

RE

F

+

RA2

/AN2

/V

RE

F

-

RA1

/AN1

RA0

/AN0

V

SS

V

DD

RA

4

/T

0

CKI

RA5

/AN4

RC1/T

1

O

S

I/ECCP2

/P

2A

RC0/

T

1

O

SO/T

13

CK

I

R

C

7/R

X

1/

D

T

1

RC6/T

X

1

/CK

1

RC5/SDO1

15
16

31

40
39

27

28

29

30

32

48
47
46
45

44
43
42
41

54

53

52

51

58

57

56

55

60

59

64

63

62

61

Note 1: The ECCP2/P2A pin placement depends on the setting of the CCP2MX configuration bit.

16

■

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■ GENERAL DESCRIPTION                                                          ■

■

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■ PACKAGE OUTLINE 

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17

The LM137/LM337 are adjustable 3-terminal negative volt-
age regulators capable of supplying in excess of −1.5A over
an output voltage range of −1.2V to −37V. These regulators
are exceptionally easy to apply, requiring only 2 external
resistors to set the output voltage and 1 output capacitor for
frequency compensation. The circuit design has been opti-
mized for excellent regulation and low thermal transients.
Further, the LM137 series features internal current limiting,
thermal shutdown and safe-area compensation, making
them virtually blowout-proof against overloads.

The LM137/LM337 serve a wide variety of applications in-
cluding local on-card regulation, programmable-output volt-
age regulation or precision current regulation. The LM137/
LM337 are ideal complements to the LM117/LM317
adjustable positive regulators.

n Output voltage adjustable from −1.2V to −37V
n 1.5A output current guaranteed, −55˚C to +150˚C
n Line regulation typically 0.01%/V
n Load regulation typically 0.3%

n Excellent thermal regulation, 0.002%/W
n 77 dB ripple rejection
n Excellent rejection of thermal transients
n 50 ppm/˚C temperature coefficient
n Temperature-independent current limit
n Internal thermal overload protection
n P

+

Product Enhancement tested

n Standard 3-lead transistor package
n Output is short circuit protected

LM137/337

TO-3 (K)

20W

1.5A

TO-39 (H)

2W

0.5A

LM337

TO-220 (T)

15W

1.5A

LM337

SOT-223

(MP)

2W

1A

00906701

Full output current not available at high input-output voltages

†

C1 = 1 µF solid tantalum or 10 µF aluminum electrolytic required for

stability

*C2 = 1 µF solid tantalum is required only if regulator is more than 4" from
power-supply filter capacitor

Output capacitors in the range of 1 µF to 1000 µF of aluminum or tantalum
electrolytic are commonly used to provide improved output impedance and
rejection of transients

00906731

November 2004

© 2004 National Semiconductor Corporation

DS009067

www.national.com

18