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Three Decades of Quality Through Innovation

Linear Integrated Systems • 4042 Clipper Court • Fremont, CA 94538 • Tel: 510 490-9160 • Fax: 510 353-0261 • Email: [email protected]

By Dimitri Danyuk

Linear Integrated Systems

Headphone Amplifier Evaluation Board

• 4042 Clipper Court • Fremont, CA 94538 • Tel: 510 490‐9160 • Fax: 510 353‐0261

Linear Integrated Systems headphone amplifier evaluation board

Dimitri Danyuk

Contents

1 Introduction 1 1.1 Features 1 1.2 Description 1 1.3 Specifications 2 2 Operation 2 2.1 Precautions 2 2.2 Quick start list for evaluation board 2 3 Circuit description 3 4 Measurements 4 5 References 8 6 Documents 9 6.1 Linear Integrated Systems headphone amplifier evaluation board schematic diagram 6.2 Linear Integrated Systems headphone amplifier evaluation board parts list 6.3 Linear Integrated Systems headphone amplifier evaluation board PCB Layers

1 Introduction

1.1 Features

Linear Integrated Systems headphone amplifier evaluation board includes the following features:

Stereo, single‐ended input and single‐ended output 400 mW output power into 100Ω Wide frequency response (10Hz‐200kHz; ‐1dB) Voltage gain 5 (14dB) Low distortion (THD+N is less than 1% at 10Hz‐20kHz at 5Vrms into 100Ω and less than 0.1% from 10 Hz to 20 kHz at 1Vrms into 100Ω load) Short‐circuit protection Pop reduction (slow start) circuit Defeatable cross‐feed circuit Volume control Overvoltage and reverse polarity power protection Audio input and output connections: left and right RCA phono jack inputs, ¼” stereo phone jack output External 9V–16V supply input External power supply connector: power jack, inside diameter 2.1mm, outside diameter 5.5mm

1.2 Description

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Linear Integrated Systems headphone amplifier evaluation board is a complete, low‐power stereo audio amplifier for high‐fidelity line‐level output and headphone applications. It consists of Linear Integrated Systems JFETs along with a number of other parts mounted on a circuit board (Fig 1).

1.3 Specifications

Supply voltage range 9V to 16V Supply current 380mA typ, 850mA max (12V) Continuous output power, 100Ω load 400 mW/ch, THD+N < 1% Audio input voltage 1.3 Vrms, max Minimum load impedance 100 Ω Maximum output current 55 mA rms

2 Operation

2.1 Precautions

Power supply polarity and maximum voltage

Always ensure that the polarity and voltage of the external power connected to power jack J1 is correct. Overvoltage or reverse‐polarity power applied to J1 may damage onboard transient voltage suppression (TVS) diode, onboard DC‐DC converter and cause damage to the power source. Please note that onboard DC‐DC converter has overvoltage protection, amplifier is not powered, if the power source voltage is greater than 16V.

2.2 Quick start list for evaluation board

1) Select and connect a 9V–16V power source to a power jack J1

2) Ensure that signal source level is set to minimum

3) Connect the audio source to left and right RCA phono jacks J2 and J4

4) Connect the load (headphones) to headphone jack J3.

5) Verify correct voltage and input polarity according to the silkscreen placed near J1 and set the external power supply to ON. On‐board LEDs (D3,D8,D103,D108) light indicate the presence of power

6) Adjust the signal source level as needed with volume potentiometer (R139)

7) Enable cross‐feed circuit by pressing switch SW1

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Fig 1 Linear Integrated Systems headphone amplifier evaluation board connections

3 Circuit description

The input stage is a complementary differential JFET stage, based on LSK489 and LSJ689 (U1 and U2). This topology is popular for audio amplifier design (Refs 1‐3). Each of these JFETs is working with 4mA drain current. Dual differential JFET input stage can handle fairly large input signals with low distortion. The input stage is loaded with complementary common gate stage, based on LSK170 and LSJ74 (Q12 and Q2). Complementary common gate stage operates at 5mA and provides single ended drive to the output stage. Output stage is a complementary source follower and consists of three LSK170 (Q3‐Q5) and three LSJ74 (Q8‐Q10). Output devices operate at 10mA each and have large copper pads for heat dissipation. Three JFET pairs in parallel allow driving loads up to 100Ω. Limiter diodes D4 and D7 prevent excessive source current in the output devices when the output of the amplifier is shorted. Gate resistors (R10‐R12, R35‐37) prevent parasitic oscillation in the output stage.

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Amplifier has open loop gain of 48dB with the cutoff frequency equal to 16kHz. The open loop gain determined by transconductance of the input stage and the common gate stage output impedance. Open loop cutoff frequency determined by the common gate stage output impedance and input capacitance of the output complementary follower.

Close loop gain equal to 20dB. R34 isolates the output of complementary source follower from capacitive load; C18 removes overshoot on the output square wave with capacitive loads.

Operational amplifier U3 with bipolar junction transistors Q6 and Q7 form a servo circuit, which maintains zero dc offset on the output terminal. Time constant of the servo circuit is about 1 sec.

Amplifier has switchable passive cross‐feed circuit (R156‐R162, C132, C133) (Refs. 4,5). Cross‐feed helps to reduce listening fatigue caused by the unnatural stereo image localization, provided by headphones. Cross‐feed circuit can be disabled by switch SW1 without change in the amplifier output voltage. Passive cross‐feed circuit adds 6dB attenuation to the input signal.

Onboard switch mode power supply provides bipolar 24V dc power to MOSFET ripple filters (Q117, Q118). Ripple filters supply left and right channels with bipolar 20V dc, perform slow start and allow using considerable value electrolytic capacitors across the rails. Input of the onboard switch mode power supply is protected with TVS diode D110. External power is galvanically isolated from amplifier circuit.

4 Measurements

Fig.2 Closed‐loop gain for Linear Integrated Systems headphone amplifier as a function of frequency. Cross‐feed circuit is disabled (R158=R160=0)

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Fig.3 Closed‐loop phase as a function of frequency. Cross‐feed circuit is disabled (R158=R160=0).

The headphone preamplifier offers wide bandwidth (Fig.2, Fig.3). At 200kHz the frequency response is down by 1dB and phase shift is ‐30°.

Fig.4 Cross‐feed circuit frequency response

Fig.4 shows the frequency response for the crossfeed‐signal (from Right input to Left output) as well as the direct audio signal (from Left input to Left output). The amplitude of the crossfeed‐signal decreases with frequency, and thus mimics the shadowing effect of the head at higher frequencies.

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Fig.5 Output impedance of Linear Integrated Systems headphone amplifier as a function of frequency. Output current 10mA

The output impedance (Fig.5) is below 1.5Ω at low and middle frequencies, rising slightly to just under 2.5Ω at the top of the audio band.

Fig.6 Total harmonic distortion plus noise (THD+N) for Linear Integrated Systems headphone amplifier as a function of output voltage.

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Figs. 6 plots how the percentage of THD+N in the headphone amplifier output changes into 100Ω, 300Ω and 2kΩ load. The clipping level exceeds 10V rms for 300Ω and 2kΩ. For 100Ω load clipping level is above 7V rms. The increase in distortion into lower impedances caused by limiting of the output current by internal short circuit protection. There is a weak dependance betwenn THD+N and the load impedance.

Fig.7 Total harmonic distortion plus noise (THD+N) for Linear Integrated Systems headphone amplifier as a function of frequency

Fig.7 plots the THD+N percentage against frequency at 1V rms and 5Vrms output. The THD+N rises slightly at the top of the audioband at 5V rms outout

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Fig.8 Individual harmonic levels for Linear Integrated Systems headphone amplifier as a function of output voltage. Load 100Ω.

At low output, the distortion is primarily the second harmonic (Fig. 8), at high output levels this is joined by third harmonic at 10dB less level. Higher order products are regularly distributed. Levels of the fourth and fifth harmonic are at least 20dB less than the level of third. Sixth and seventh harmonic levels are about 100dB less than fundamental.

5 References

1 J.Curl, “JC‐2 Preamplifier”, The Audio Amateur, 1977, No 3, p.48

2 J.Curl, “JC‐3 Power Amplifier”, The Audio Amateur, 1981, No 2, p.56, reprinted in Electronics World, April 2000, p.342

3 E.Borbely, "Starter Kits: EB‐604/410 All‐JFET Line Amp", AudioXpress, March 2005, pp.9‐15.

4 D.Danyuk, “Adjustable Crossfeed Circuit for Headphones,” Electronics World, August 2005, p.46

5 “F5‐HA Discrete All FET Class A Headphone Amplifier”, http://xen‐audio.com/documents/f5ha/F5‐HA%20Description%20V1.4.pdf retrieved on 09/01/2016

Related documentation from Linear Integrated Systems:

LSJ74, SST74 ULTRA LOW NOISE SINGLE P‐CHANNEL JFET, datasheet, www.linearsystems.com/assets/media/file/datasheets/LSJ74_SST74.pdf retrieved on 09/01/2016

LSK170 ULTRA LOW NOISE SINGLE N‐CHANNEL JFET AMPLIFIER, datasheet, www.linearsystems.com/assets/media/file/datasheets/LSK170.pdf retrieved on 09/01/2016

LSK489 LOW NOISE LOW CAPACITANCE MONOLITHIC DUAL N‐CHANNEL JFET AMPLIFIER, datasheet, www.linearsystems.com/assets/media/file/datasheets/LSK489.pdf retrieved on 09/01/2016

LSJ689 LOW NOISE LOW CAPACITANCE MONOLITHIC DUAL P‐CHANNEL JFET AMPLIFIER, datasheet, www.linearsystems.com/assets/media/file/datasheets/lsj689part.pdf retrieved on 09/01/2016 retrieved on 09/01/2016

LSK489 Ultra Low Noise JFET, application note, www.linearsystems.com/assets/media/application_notes/LSK489_Application_Note.pdf retrieved on 09/01/2016

LSJ689 Low‐capacitance, monolithic dual P‐Channel JFET, application note, www.linearsystems.com/assets/media/application_notes/app_note_lsj689.pdf retrieved on 09/01/2016

6 Documents

6.1 Linear Integrated Systems headphone amplifier evaluation board schematic diagram

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See attachment

6.2 Linear Integrated Systems headphone amplifier evaluation board parts list

See attachment

6.3 Linear Integrated Systems headphone amplifier evaluation board PCB Layers

The following illustrations portray the Linear Integrated Systems headphone amplifier evaluation board silkscreen, top and bottom layers. These illustrations are not to scale. Gerber files can be obtained from Linear Integrated Systems sales office.

Fig.9 Linear Integrated Systems headphone amplifier evaluation board silkscreen

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Fig.10 Linear Integrated Systems headphone amplifier evaluation board top layer

Fig.11 Linear Integrated Systems headphone amplifier evaluation board bottom layer

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6

8

5

C11

533

nC

115

33n

C11

9

DN

P

C11

9

DN

P

R11

420R

114

20C10

733

nC

107

33n

D10

7R

ED

D10

7R

ED

R12

220

kR

122

20k

R12

620R

126

20

C11

21u

C11

21u

Q10

6FJ

V18

45Q

106

FJV

1845

1

23

D10

6

BA

T54S

D10

6

BA

T54S

C11

8

100p

C11

8

100p

Q11

4

DN

P(L

SK

170)

Q11

4

DN

P(L

SK

170)

1

3

2

R16

310

0kR

163

100k

R11

520R

115

20

5 5

4 4

3 3

2 2

1 1

DD

CC

BB

AA

GN

D

GN

D

GN

D

GN

D

GN

D

GN

D

GN

D

GN

D

GN

D

GN

D

GN

DG

ND

GN

DG

ND

GN

D

+20V

-20V

LIN

RIN

RO

UT

LOU

T

Title

Siz

eD

ocum

ent N

umbe

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of

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LSK

489

LSJ6

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489

LSJ6

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Mon

day,

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489

LSJ6

89 E

VB

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er S

uppl

y, C

onne

ctor

s

Cus

tom

33

Mon

day,

Sep

tem

ber 1

2, 2

016

C&

K P

N22

SJN

A03

QE

Am

phen

ol A

CJS

-MH

DR

(Mou

ser)

+12V

-12V

LEFT

CH

RIG

HT

CH

J2J4

J3R

159

SW

1

Left

Cha

nnel

Rig

ht C

hann

el

Pow

er S

uppl

y

J1

Cro

ssfe

edE

nabl

e/D

isab

le

12V 380mA

4042

Clip

per C

ourt

Frem

ont,

CA

945

38

Tel:

510

490-

9160

Fax

: 510

353

-026

1

R15

020

kR

150

20k

C13

247

nC

132

47n

MH

2M

HM

H2

MH 1

C27

DN

PC

27D

NP

C25

0.1u

C25

0.1u

R42

DN

P

R42

DN

P

R15

3D

NP

R15

3D

NP

SW

1S

W S

LID

E-D

PD

TS

W1

SW

SLI

DE

-DP

DT

12

345

6

R15

2D

NP

R15

2D

NP

MH

4M

HM

H4

MH 1

R15

520

kR

155

20k

+

C12

910

0u/2

5V+

C12

910

0u/2

5V

+C

128

100u

/25V

+C

128

100u

/25V

D11

0

SM

A6T

22A

Y

D11

0

SM

A6T

22A

Y

J2

PJR

AN

1X1U

02X

(WH

ITE

)

J2

PJR

AN

1X1U

02X

(WH

ITE

)2 3 1

R15

4

100

R15

4

100

+

C13

122

u/10

0V+

C13

122

u/10

0V

R16

2

33k

R16

2

33k

C13

347

nC

133

47n

D10

9MM

BD

7000

D10

9MM

BD

7000

MH

1M

HM

H1

MH 1

+

C12

622

u/10

0V+

C12

622

u/10

0VC

26D

NP

C26

DN

P

R15

1

100

R15

1

100

C13

5

DN

P

C13

5

DN

PQ

118

IRF9

610

Q11

8IR

F961

0

MH

3M

HM

H3

MH 1

+

C12

5

330u

/25V

+

C12

5

330u

/25V

J1 PJ-

202A

J1 PJ-

202A

1 3 2

R15

8

10k

R15

8

10k

Q11

7IR

F710

Q11

7IR

F710

J4

PJR

AN

1X1U

03X

(RE

D)

J4

PJR

AN

1X1U

03X

(RE

D)

2 3 1

D11

1

MM

BD

7000

D11

1

MM

BD

7000

U10

4JC

E06

12D

24U

104

JCE

0612

D24 -Vin1 2

-Vin2 3Com1 9-Vout 11+Vout14 Com216 +Vin122 +Vin223

R15

7

33k

R15

7

33k

C28

DN

PC

28D

NP

J3 AC

JS-M

HD

R

J3 AC

JS-M

HD

R

5 2 3 6 41

R15

9

PTD

902-

1025

K-A

103

R15

9

PTD

902-

1025

K-A

103

R16

0

10k

R16

0

10k

R16

1

5.1k

R16

1

5.1k

+

C13

0

330u

/25V

+

C13

0

330u

/25V

+

C12

7

470u

/25V+

C12

7

470u

/25V

R15

6

5.1k

R15

6

5.1k

LSK489 LSJ689 EVB Revised

: Friday, Sep

tember 09, 2016

Revision: C

Bill Of Materials

Item

Quan

tity

Reference

Part

PCB Footprint

Description

Man

ufacturer Part

Number

Distributor Part Number

(Digikey, M

ouser)

124

C1,C2,C6,C7,C8,C10,C1

4,C15,C16,C17,C21,C23,

C101,C102,C106,C107,C

108,C110,C114,C115,C1

16,C117,C121,C123

33n

1206

0.033µF 100V Ceram

ic Capacitor

C0G

C3216C0G2A333J160AA445‐15415‐6‐ND

24

C3,C20,C103,C120

10u/100V

CPCYL1/D.325/LS.125/.034

10µF 100V Aluminum Capacitor

Radial

UFG

2A100MPM1TD

493‐10867‐1‐ND

36

C4,C22,C104,C122,C125

,C130

330u/25V

CPCYL1/D.400/LS.200/.034


Radial

UFG

1E331MPM1TD

493‐10914‐1‐ND

423

R8,R9,C9,C13,C19,C24,

C26,C27,C28,C34,R38,R

46,R108,R109,C109,C11

3,C119,C124,C134,R138

,R146,R152,R153

DNP

805

54

C11,C12,C111,C112

1u

1206

1µF 100V Ceram

ic Capacitor X7R

C3216X7R2A105M160A

A

445‐4468‐1‐ND

62

C18,C118

100p

805

100pF 100V Ceram

ic Capacitor C0G

CGA4C2C0G2A101J060

AA

445‐6951‐1‐ND

71

C25

0.1u

805

0.10µF 100V Ceram

ic Capacitor X7RC2012X7R2A104K125A

A

445‐1418‐1‐ND

82

C126,C131

22u/100V

CPCYL1/D.325/LS.125/.034


Radial

UKZ1H220MPM

493‐3193‐ND

91

C127

470u/25V

CPCYL1/D.400/LS.200/.034


Radial

UFW

1E471MPD1TD

493‐10998‐1‐ND

10

2C128,C129

100u/25V

CPCYL1/D.325/LS.125/.034


Radial

UPW1J101MPD6

493‐1937‐ND

11

2C132,C133

47n

1206

0.047µF 100V Ceram

ic Capacitor

C0G

C3216C0G2A473J115AC445‐172673‐1‐ND

12

4D1,D2,D101,D102

BZX84C15

SOT23

Zener Diode 15V 225mW

BZX84C15LT1G

BZX84C15LT1GOSCT‐ND

13

4D3,D8,D103,D108

GRN

LED_0805

Green

569nm LED

Indication ‐

Discrete 2.1V

LTST‐C171GKT

160‐1423‐1‐ND

14

4D4,D7,D104,D107

RED

LED_0805

Red

631nm LED

Indication ‐

Discrete 2V

LTST‐C171KRKT

160‐1427‐1‐ND

15

2D5,D105

DNP

SOT23

16

2D6,D106

BAT54S

SOT23

Diode Array 1 Pair Series

Connection Schottky 30V 200mA

BAT54SLT1G

BAT54SLT1GOSCT‐ND

17

2D109,D111

MMBD7000

SOT23

Diode Array 1 Pair Series

Connection Standard 100V 200mA

MMBD7000LT3G

MMBD7000LT3GOSCT‐ND

18

1D110

SMA6T22AY

SMA

TVS DIODE 18.8VWM 39.3VC SMA

SMA6T22AY

497‐10939‐1‐ND

19

1J1

PJ‐202A

PJ‐202A

Power Barrel Connector Jack

2.00mm ID

(0.079"), 5.50mm OD

(0.217") Through

Hole, R

ight Angle

PJ‐202A

CP‐202A‐ND

20

1J2

PJRAN1X1U02X (WHITE)

PJRAN1X1U

RCA Phono Connectors 1 POS RA

PH JK W

HITE

PJRAN1X1U02X

502‐PJRA

N1X

1U02

X

21

1J3

ACJS‐M

HDR

ACJS‐M

HDR

Phone Connectors 1/4" PHON SKT

STER

EO

ACJS‐M

HDR

523‐AC

JS‐M

HDR

22

1J4

PJRAN1X1U03X (RED

)PJRAN1X1U

RCA Phono Connectors 1 POS RA

PH JK RED

PJRAN1X1U03X

502‐PJRA

N1X

1U03

X

23

4MH1,M

H2,M

H3,M

H4

MH

MTG

H125‐PLATED

24

8Q2,Q8,Q9,Q10,Q102,Q

108,Q109,Q110

SST74B

SOT89

Transistor, P‐Channel, Single, JFET

25

8Q3,Q4,Q5,Q12,Q103,Q

104,Q105,Q112

LSK170C

SOT23

Transistor, N‐Channel, Single, JFET

26

2Q6,Q106

FJV1845

SOT23

TRANS NPN 120V 0.05A SOT‐23

FJV1845FM

TF

FJV1845FM

TFCT‐ND

27

2Q7,Q107

FJV992

SOT23

TRANS PNP 120V 0.05A SOT‐23

FJV992FM

TF

FJV992FM

TFCT‐ND

28

4Q13,Q14,Q113,Q114

DNP(LSK170)

SOT23

29

4Q15,Q16,Q115,Q116

DNP(SST74)

SOT89

30

1Q117

IRF710

TO220

MOSFET

N‐CH 400V 2A TO‐220AB IRF710PBF

IRF710PBF‐ND

31

1Q118

IRF9610

TO220

MOSFET P‐CH 200V 1.8A TO‐220AB

IRF9610PBF

IRF9610PBF‐ND

32

6R1,R4,R34,R101,R104,R

134

5.1

1210

RES SMD 5.1 OHM 1% 1/2W

ERJ‐14BQF5R1U

P17267CT‐ND

33

8R2,R3,R24,R40,R102,R1

03,R124,R140

1k

805

RES SMD 1K OHM 1% 1/8W

ERJ‐6EN

F1001V

P1.00KCCT‐ND

34

4R6,R49,R106,R149

270

805

RES SMD 270 OHM 1% 1/8W

ERJ‐6EN

F2700V

P270CCT‐ND

35

14

R10,R11,R12,R23,R35,R

36,R37,R110,R111,R11

2,R123,R135,R136,R13

7

10

805


ERJ‐6EN

F10R0V

P10.0CCT‐ND

36

12

R13,R14,R15,R26,R27,R

28,R113,R114,R115,R1

26,R127,R128

20

805


ERJ‐6EN

F20R0V

P20.0CCT‐ND

37

12

R19,R20,R32,R33,R41,R

119,R120,R132,R133,R

141,R151,R154

100

805


ERJ‐6EN

F1000V

P100CCT‐ND

38

4R21,R39,R121,R139

1M

805

RES SMD 1M OHM 1% 1/8W

ERJ‐6EN

F1004V

P1.00MCCT‐ND

39

4R22,R122,R150,R155

20k

805


ERJ‐6EN

F2002V

P20.0KCDKR‐ND

40

2R25,R125

51

805

41

2R44,R144

2k

1210


ERJ‐14NF2001U

P2.00KAACT‐ND

42

2R45,R145

200

805


ERJ‐6EN

F2000V

P200CTR

‐ND

43

2R63,R163

100k

805


ERJ‐6EN

F1003V

P100KCCT‐ND

44

2R156,R161

5.1k

805

RES SMD 5.1K OHM 1% 1/8W

ERJ‐6EN

F5101V

P5.10KCCT‐ND

45

2R157,R162

33k

805


ERJ‐6EN

F3302V

P33.0KCDKR‐ND

46

2R158,R160

10k

805


ERJ‐6EN

F1002V

P10.0KCCT‐ND

47

1R159

PTD

902‐1025K‐A103

PTD

902

Potentiometer 10K AUDIO

PTD

902‐1025K‐A103

652‐PTD9

02‐102

5KA1

03

48

1SW

1SW

SLIDE‐DPDT

PN22SJNA03QE

Pushbutton Switch DPDT Standard

Through

Hole, R

ight Angle

PN22SJNA03QE

CKN1191‐ND

49

2U1,U101

LSK489

SOIC‐8/TO‐71

N‐Channel Transistor, JFET, 6

Leads, Low Noise, Low Capacitance,

Monolithic Dual

50

2U2,U102

LSJ689

SOIC‐8/TO‐71

P‐Channel Transistor, JFET, 6 Leads,

Low Noise, Low Capacitance,

Monolithic Dual

51

2U3,U103

AD8510

SOIC‐8

J‐FET Amplifier 1 Circuit 8‐SOIC

AD8510ARZ

AD8510ARZ‐ND

52

1U104

JCE0612D24

JCE06

DC/DC CONVER

TER +/‐24V 6W

JCE0612D24

1470‐1924‐5‐ND

53

4standoff

HEX

STA

NDOFF 4‐40 BRASS 1/4"

8713

36‐8713‐ND

54

4nut

#4‐40 Hex Nut 0.250"

HNZ 440

H216‐ND

55

4lock waher

WASH

ER SPLIT LO

CK #4

4693

36‐4693‐ND

56

4socket for

U1,U2,U101,U102 TO‐

71

6 Position Socket Connector 0.100"

(2.54mm) Through

Hole Gold

803‐87‐006‐10‐001101 1212‐1229‐ND