JRC NJM2705 User Manual

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Surround Audio Processor for Mobile Applications

■■■■ GENERAL DESCRIPTION

The NJM2705 is the surround audio processor for mobile
applications.
It regenerates the 3D surround s ound with extremely narrow
space two speakers (2SP mode), headphone surround with
normal headphone (HP mode) and reverberation sound with
only one speaker (1SP mode).
It includes mode control switches for surround function and
standby function and re a liz es low consumption power desig n by
standby function.

In addition to SSOP16, an ultra small and thin package
FFP16 (Flip-Chip Fine Package) is applied.

It is suitable for cellular phone, PDA and portable game.

■■■■ FEATURES

● Operating Voltage 1.8 to 6V

● Operating Current 0.7mA typ. at Active mode
1µA max. at Standby mode

● Low Output Noise 10µVrms typ
(2SP/HP/1SP mode, VR : max.)

● Variable Surround Effect by external resistor
(Adjustable for speaker and headphone independently.)

● Standby Function

● Internal Mode Control Switch

● Bipolar Technology

● Package Outline FFP16, SSOP16

■■■■ BLOCK DIAGRAM

LIN

3D

Filter

RIN

3D

Enhancer

1SP

Surround

■■■■ PACKAGE OUTLINE

NJM2705PC1

Bypass mode

2SP mode

HP mode
1SP mode

Surround mode

NJM2705

NJM2705V

LOUT

ROUT

-1-

(Top

NJM2705

■■■■ PIN CONFIGURATION

FFP16 (Top View)

13
14
15
16

12

11 10 9

1 2 3

4

8
7
6
5

1. LIN 9. LMON

2. RIN 10. PS

3. LOUT 11. SW2

4. ROUT 12. SW1

5. NFSPR 13. STBY

6. NFHPR 14. V+

7. NFSPL 15. GND

8. NFHPL 16. VREF

SSOP16

1
2
3

5
6

View)

16
15
14
13 4
12
11
10 7

9 8

1. NFHPR 9. V+

2. NFSPR 10. STBY

3. ROUT 11. SW1

4. LOUT 12. SW2

5. RIN 13. PS

6. LIN 14. LMON

7. VREF 15. NFHPL

8. GND 16. NFSPL

- 2 -

NJM2705

■■■■ABSOLUTE MAXIMUM RATING (Ta=25°C)

PARAMETER SYMBOL RATINGS UNIT

Supply Voltage V+ 7 V
Power Dissipation PD
Operating Temperature Range T

Storage Temperature Range T

opr
stg

(FFP16) 400

(SSOP16) 300

-20 to +75 °C

-40 to +125 °C

mW

■■■■OPERATING VOLTAGE

PARAMETER

SYMBOL

Operating Voltage V+ - 1.8 3.0 6.0 V

TEST CONDITION MIN TYP MAX UNIT

■■■■ELECTRICAL CHARACTERISTICS (V+=3V, Ta=25°C unless otherwise specified)

TEST CONDITION

PARAMETER

Operating
Current

Reference
Voltage

SYMBOL

ICC

Vref

No Signal

L R
0 0
0 0

No Signal 0 0

INPUT

OUT
PUT

-

-

-

MODE

Active

Standby

-

SPVRHP

- 450 700

- 0.1 1.0

1.0 1.15 1.3 V

MIN TYP MAX UNIT

VR

µA

●AC CHARACTERISTICS

+

(V

=3V, Ta=25°C, VIN=-20dBV(100mVrms), f=1kHz, RL=10kΩ, unless otherwise specified)

TEST CONDITION

PARAMETER

Maximum
Input Voltage

Output Noise

SYMBOL

f=1kHz

V

IM1

THD=1%
f=100Hz

V

IM2

THD=1%
f=100Hz

V

IM3

THD=1%
f=100Hz

V

IM4

THD=1%
f=100Hz

V

IM5

THD=1%

+

=1.8V,f=1kHz

V

V

IM6

THD=1%

+

=1.8V,f=100Hz

V

V

IM7

THD=1%

+

=1.8V,f=100Hz

V

V

IM8

THD=1%

+

=1.8V,f=100Hz

V

V

IM9

THD=1%

IM10

V

V

+

=1.8V,f=100Hz

THD=1%

NO1

Rg=0Ω

V

A-Weighted

NO2

Rg=0Ω

V

A-Weighted

NO3

Rg=0Ω

V

A-Weighted

NO4

Rg=0Ω

V

A-Weighted

INPUT

OUT

L R

V

IN

0 0 V

V

IN

0 0 V

V

IN

0 0 V

V

IN

0 V

V

IN

0 0 V

V

IN

0 0 V

V

IN

0 0 V

V

IN

0 V

0 0

0 0

0 0

PUT

L
R

IN

L
R

IN

L
R

IN

0 L

L

IN

L
R

IN

L
R

IN

L
R

IN

0 L

L

IN

L
R
L
R
L
R

0 0 L

MODE

Bypass

2SP

HP

1SP

1SP

Bypass

2SP

HP

1SP

1SP

Bypass

1SP

HP

1SP

SPVRHP

VR

- -

MAX -

- MAX

MAX -

MAX -

- -

MAX -

- MAX

MAX -

MAX -

- -

MAX -

- MAX

MAX -

MIN TYP MAX UNIT

-

-

-

-

-

-10.5
(300)

-24.5

(60)

-24.5

(60)

-24.5

(60)

-23.0

(70)

-

-

-

-

-2.0
(790)

-16.0
(160)

-16.0
(160)

-16.0
(160)

-14.5
(190)

-8.5
(380)

-22.5

(75)

-22.5

(75)

-22.5

(75)

-21.0

(90)

-112
(2.5)

-100

(10)

-100

(10)

-100

(10)

-

-

-

-

-

-

-

-

-

-

-106
(5.0)

-94

(20)

-94

(20)

-94

(20)

dBV

(mVrms)

dBV

(µVrms)

-3-

NJM2705

●AC CHARACTERISTICS

+

(V

=3V, Ta=25°C, VIN=-20dBV(100mVrms), f=1kHz, RL=10kΩ, unless otherwise specified)

TEST CONDITION

PARAMETER

Total Harmonic
Distortion

BYPASS Gain G

Surround Gain

SYMBOL

THD1

THD2

THD3

THD4

VBYP

G

VSUR1

G

VSUR2

G

VSUR3

G

VSUR4

G

VSUR5

f=1kHz

f=1kHz

f=1kHz

f=1kHz

f=1kHz

f=100Hz

f=100Hz

f=100Hz

f=100Hz

f=100Hz V

INPUT

L R

V

IN

0 0 V

V

IN

0 0 V

V

IN

0 0 V

V

IN

0 0 V

V

IN

0 0 V

V

IN

0 0 V

V

IN

0 0 V

V

IN

0 0 V

V

IN

0 0 V

IN

OUT
PUT

L
R

IN

L
R

IN

L
R

IN

L
R

IN

L
R

IN

L
R

IN

L
R

IN

L
R

IN

L
R

IN

0 L

MODE

Bypass

2SP

HP

1SP

Bypass

2SP

2SP

HP

HP

1SP

SPVRHP

MAX -

MAX -

MAX -

MIN -

MAX -

VR

- -

- MAX

- -

- MAX

- MIN

MIN TYP MAX UNIT

- 0.02 0.05

- 0.1 0.5
%

- 0.1 0.5

- 0.1 0.5

-1.0 0.0 1.0

dB

12.5 14.5 16.5

0.5 2.5 4.5

12.5 14.5 16.5

0.5 2.5 4.5
dB

6.5 8.5 10.5

G

G

G

VSUR6

f=100Hz 0 V

VSUR7

f=100Hz V

VSUR8

f=100Hz 0 V

IN

L

IN

0 L

L

IN

1SP

1SP

1SP

MAX -

MIN -

2.0 4.0 6.0

-5.5 -3.5 -1.5

MIN - -12.0 -10.0 -8.0

●●●●CONTROL CHARACTERISTICS (V+=3V, Ta=25°C unless otherwise specified)

PARAMETER
MODE Selec t
Control Voltage

SYMBOL

V

MODE

VIN=High Level
V

=Low Level

IN

TEST CONDITION MIN TYP MAX UNIT

1.2 - V

0.0 - 0.3

■■■■SWITCH FUNCTION
SURROUND FUNCTION SW

MODE SW1 SW2 NOTES

Bypass L, OPEN L, OPEN Input Through

2SP mode L, OPEN H Surround mode for narrow space two speakers

HP mode H L, OPEN Surround mode for Headphone

1SP mode H H Surround mode for monaural speaker (Surround signal from LOUT)

STANDBY SW

MODE STBY NOTES

Standby L, open IC is non-active

Active H IC is active

+

V

- 4 -