MXIC MX93002FC, MX93002QC Datasheet

MX9 3002

1 Ver 2.50 September 17, 1998

FEATURES

. Built-in two single +5V power supply PCM CODECs
. Support Digital Speakerphone application
. Support automatic power-down function
. Support 2.048 or 1.536 MHz master clock for 8KHz
Frame Sync.
. Support £g/A law and 16-bit format linear data
. Support switch paths for DAM (digital answering
machine) related applications
. Support two comparators for power-low and
battery- low detection

7. Support external L.P.F. for D/A output path

. Support external volume control
. On-chip differential line driver
. On-chip ALC (automatic level control)
. On-chip digital volume control
. On-chip differential 8Ω power amplifier
. On-chip programmable receive/transmit gain
control
. Easy interface to general purpose DSP
. Easy Read/Write of control registers by MCU
. Easy interface to FAX or Cordless Phone
. 44-pin PQFP/PLCC package

PIN CONFIGURATION

44 PINS PQFP

1 2 3 4 5 6 7 8 9 101

1

12

13

14

16

17

18

19

20

21

22

232425262728293031323

3

34
35

37
38
39
40
41
42
43
44

15

36

44 PINS PLCC

181

9

272

8

29

30

31

33

35

36

37

38

39

404142434

4123456

8

10
11

13
14
15
16
17

32

9

7

12

2021222324252

6

34

DGND

VDD

MCLK

FS

DR1

DX1

SDATA

S
D
E
N
B

FILT

S
V
D
D
1

S
V
D
D
2

S
P
K
N

S
G
N
D

S
P
K
P

A
U
X
2

VRL

P
F
C
2

L
P
F
C
1

ALCC2

ALCC1
ALCRC
PGAC1

AUX1

LIN

VREF

AG

VBG

A
V
D
D

L
O
U
T
N

L
O
U
T
P

V
B
A
T

B
A
T
B

V
P
O
W

P
O
W
B

SCLK

MIC

C
P

P
V
D
D

A
G
N
D

PGND

DR2

DX2

V
C
O
M
P

DGND

VDD

MCLK

FS

DR1

DX1

SDATA

S
D
E
N
B

FILT

S
V
D
D
1

S
V
D
D
2

S
P
K
N

S
G
N
D

S
P
K
P

A
U
X
2

VRL

P
F
C
2

L
P
F
C
1

ALCC2

ALCC1
ALCRC
PGAC1

AUX1

LIN

VREF

AG

VBG

A
V
D
D

L
O
U
T
N

L
O
U
T
P

V
B
A
T

B
A
T
B

V
P
O
W

P
O
W
B

SCLK

MIC

C
P

P
V
D
D

A
G
N
D

P
G
A
C
2

PGND

DR2

DX2

V
C
O
M
P

P
G
A
C
2

MX9 3002

2

PRODUCT OVERVIEW

The MX93002 PCM CODEC integrates key functions of the analog-front-end of DAM (with Digital Speakerphone)
related products into an integrated circuit. The MX93002 PCM CODEC is especially powerful when applied to some
DAM models which are intended to meet different countries' specifications in the same system hardware. User
can achieve this goal by simply setting control firmware. This benefit will help DAM system makers to save
developing time and R&D resources.

The MX93002 has two A/D, D/A converters so as to meet the requirement of the digital speakerphone application.
The on-chip digital filters, which are carried out with 16-bit and 2's complement format, are used to get required
frequency response of a PCM CODEC. The CODEC can support 8-bit u/A law and linear data format. For the latter,
it is 16-bit format with 14-bit resolution.

Before the A/D digitizing the voice-band analog signal into digital format, the analog signal can be processed by a
built-in Automatic Level Control (

ALC

) and PRE-Programmable Gain Amplifier (

PRE-PGA

). The

ALC

circuit

controls the signal level about 1.2Vpp and

AD1-PGA

can provide 0 ~ 18dB gain to get more larger signal. The

PRE-PGA

circuit is used to control the gain of different sources like

MIC, AUX1

or

LIN

input.

After the digital data is converted into analog signal by D/A converter, a fully differential line driver and speaker
driver are supported to drive the telephone line and 8Ω speaker directly without needing any external amplifiers.
Besides, the analog signal can be monitored by passing the on-chip volume control or external volume control.

The MX93002 supports many switches as well. User can program the control registers of the PCM CODEC to
accomplish all specific operations of DAM (with digital speakerphone function) related products.

In order to let MCU (Micro controller) easily Read/Write the control registers of the MX93002, the sampling clock of
the serial control data is clocked by external

SCLK

clock and synchronized by

SDENB

, where

SDENB

signal is

coming from the MCU output port by detecting one of the rising edge of external

SCLK

clock.

MX9 3002

3

BLOCK DIAGRAM ( PQFP )

AIN1

2 PCM CODECS

FILT

POWB

BATB

VBATVPOW

4

6

22

R6

R7

AVDD

10

AVDD

AGND

SERIAL

CONTROL

UNIT

R4

R5

75

VBG

AG

13

AG

24

LPFC1

25

LPFC2

11

C5

C14C13

C16

C7

VREF

15

R2

14

C8

MIC

AG

17
16

ALCC2

ALCC1

21

19
20

18

+

R3

ALCRC

C9

C11

C10

FAX TXA

Corelessphone TXA

AUX-I/O

SWE

SWK

LOUTN

8

9

LIN
DRV

TELEPHONE

LINE

INTERFACE

LOUTP

SWF

VR

27

SPK

29

31

VR1

AOUT2

SWH

FAX RXA

Corelessphone RXA

AUX-I/O

AUX2

26

12

C15

43

C4

42

VDD

33

34

SDENB

SDATA

35

SCLK

uP

check

SYSTEM

Battery

uP

check

SYSTEM

Power

uP
TX / RX
Control
DATA

uP
Enable
SDATA

uP
Send
SCLK

C12

SVDD1
SVDD2
SGND

28
32
30

AVDD

MIC

A

c

a
b

AG

d

AUX1

LIN

SWA

PGAC1

SWD

b

A

SWC

a

SWI

L.P.F.

DGNDAGND

DGND

SWL

POW

BAT

SWM

ALC

PRE
PGA

AD1
PGA

C6

AD2
PGA

23

PGAC2

SWJ

AOUT1

AIN2

DSP

Receive

DATA1

DSP

Transmit

DATA1

DSP

Frame

Sync.

signal

DSP

Master

Clock

signal

DSP

Receive

DATA2

DSP

Transmit

DATA2

41

37

36

40

MCLK

FS

DR1

DX1

39

38

DR2

DX2

SWB

A
I
N
1

A
O
U
T
1

A
O
U
T
2

A
I
N
2

VCOMP

3

1

CP

C1

R1

C2

AC/DC

ADAPTOR

BATTERY

POWER

V reference

for POW and BAT

2 Comparators

VDD

44

C3

2

PVDD

DGND

DGND

PVDD

SWN

BUF

SWO

C17

SPKN

SPKP

SPK

DRV

ATT2

a

SWG

B

A

ATT1

D/A

PGA

MX9 3002

4

PIN DESCRIPTION

SYMBOL PIN

TYPE

PIN NBR.

PQFP

(PLCC)

DESCRIPTION

CP

I (D) 1 (18) the output of internal PLL charge pump circuits; see the end of page 21 about lock-

in
time spec.

PVDD

P (D) 2 (19) digital power supply; 5V power supply for internal PLL charge pump circuits

VCOMP

I (A) 3 (20) the reference voltage for

POW

and

BAT

comparators use

POWB

O (A) 4 (21) the output of

POW

comparator; active low

VPOW

I (A) 5 (22) the Non-inverting input of

POW

comparator; the voltage is divided from system DC

power for comparison with

VCOMP

; with 7V Surge Protect

BATB

O (A) 6 (23) the output of

BAT

comparator; active low

VBAT

I (A) 7 (24) the Non-inverting input of

BAT

comparator; the voltage is divided from battery

power for compare with

VCOMP

; with 7V surge protect

LOUTP

O (A) 8 (25) the Non-inverting output of

LIN-DRV

with PGA; PGA from 0 to 22.5dB; 1.5dB/step

LOUTN

O (A) 9 (26) the Inverting output of

LIN-DRV

with PGA; PGA from 0 to 22.5dB; 1.5dB/step

AVDD

P (A) 10 (27) analog power supply; 5V power supply for all internal analog circuits

AGND

P (A) 11 (28) analog power ground

VBG

O (A) 12 (29) band-gap reference; nominal 1.25VW and should not be used to sink or source

current

AG

O (A) 13 (30) internal analog signal ground; nominal 2.25VW and should not be used to sink or

source current

VREF

O (A) 14 (31) voltage reference; nominal 2.25VW and can sink 450uA

MIC

I (A) 15 (32) microphone input with

PRE-PGA

; PGA from -15 to 21dB;see

NOTE 1

LIN

I (A) 16 (33) telephone line signal input with

PRE-PGA

; PGA from -15 to 21dB; see

NOTE 1

AUX1

I/O (A) 17 (34) auxiliary signal input with

PRE-PGA

; PGA from -15 to 21dB; see

NOTE 1

PGAC1

O (A) 18 (35) programmable gain amplifier (

PRE-PGA

) compensative capacitor

ALCRC

O (A) 19 (36) automatic level control (

ALC

) time constant; see

FIG. 5

ALCC1

O (A) 20 (37) automatic level control (

ALC

) DC blocking capacitor output

ALCC2

O (A) 21 (38) automatic level control (

ALC

) DC blocking capacitor input

FILT

I/O (A) 22 (39) 1. anti-aliasing filter; 2. as an I/O port for

AIN

(A/D input)

PGAC2

O ( A ) 23 (40) Programmable Gain Amplifier Offset Capacitor

MX9 3002

5

SYMBOL PIN

TYPE

PIN NBR.

PQFP

(PLCC)

DESCRIPTION

LPFC1

O (A) 24 (41) the option of the external passive

L.P.F.

(Low Pass Filter); if the pin is NC then will

by-pass L.P.F, where L.P.F. 3dB point : fc = 1/2£k∗ 3KΩ (±10%)∗ C

LPFC1

)

LPFC2

O (A) 25 (42) the option of the external passive

L.P.F.

(Low Pass Filter); if the pin is NC then will

by-pass L.P.F, where L.P.F. 3dB point : fc = 1/2£k∗ 3KΩ (±10%)∗ C

LPFC2

)

AUX2

I/O (A) 26 (43) as an I/O port for

SWK

and

SWH

VR

O (A) 27 (44) external speaker volume control; use a 10KΩ variable resistor

SVDD1

P (A) 28 (1) analog power supply; 5V power for

SPK-DRV

SPKP

O (A) 29 (2) the Non-inverting output of

SPK-DRV

with

DA-PGA, ATT1

and

ATT2

; PGA from 0

to 9dB; Attenuator 1 & 2 from 0 to -45dB; see

NOTE. 3

SGND

P (A) 30 (3) analog power ground for

SPK-DRV

SPKN

O (A) 31 (4) the Inverting output of

SPK-DRV

with

DA-PGA, ATT1

and

ATT2

; PGA from 0 to

9dB; Attenuator 1 & 2 from 0 to -45dB; see

NOTE 3

SVDD2

P (A) 32 (5) analog power ground for

SPK-DRV

SDENB

I (D) 33 (6) the enable signal for serial control data; active low; for starting to Receive/Transmit

serial control data (A2~A0,D7~D0)

SDATA

I/O (D) 34 (7) Bi-directional serial control data port; it is an interface for Microprocessor to

Transmit/Receive serial control data

SCLK

I (D) 35 (8) serial control data clock; the clock source of serial control data; from

microprocessor

DX1

O (D) 36 (9) transmit serial data

DR1

I (D) 37 (10) receive serial data

DX2

O (D) 38 (11) transmit serial data

DR2

I (D) 39 (12) receive serial data

FS

I (D) 40 (13) frame sync. input; 8KHz frame sync. Clock for the Transmit/Receive serial data

MCLK

I (D) 41 (14) master clock input, if MCLK is continuously high or low then the MX93002 will get

into power down mode automatically

VDD

P (D) 42 (15) digital power supply; 5V power supply for all internal digital logic

DGND

P (D) 43 (16) digital power ground

PGND

P (D) 44 (17) digital power ground; for internal PLL charge pump circuits

@ PIN TYPE : “I” : Input Port; “O” : Output Port; “I/O” : Bi-direction Port; “P” : Power
“(D)” : Digital Pin; “(A)” : Analog Pin

MX9 3002

6

BASIC COMPONENTS REQUIRED

REFERANCE PART DESCRIPTION

*R1

68KΩ the resistor for internal PLL charge pump circuits

R2

2KΩ current limit resistor; to limit MIC bias current, please follow MIC specification

R3

560KΩ

ALC

release time constant; see

FIG. 10

R4, R5

to scale down DC power supply (

VPOW

) for reference to

VCOMP

to check power low

R6, R7

to scale down battery power (

VBAT

) for reference to

VCOMP

to check battery low

*C1

100pF the capacitor for internal PLL charge pump circuits

*C2

6pF the capacitor for internal PLL charge pump circuits

C8, C17

0.1uF DC blocking capacitor (0.1~10uF)

C11

0.22uF DC blocking capacitor (0.1~10uF); H.P.F.
3dB point : fc ¡Ü 1/2£k∗ 4.4KΩ ∗ C6 (0.22uF) = 164Hz

C6

10uF DC offset canceling compensative capacitor (4.7~10uF, the larger the better)

C9

0.1uF DC offset canceling compensative capacitor (0.1~1uF, the larger the better)

C3, C4, C5,

C12, C16

0.1uF De-couple capacitor (0.1~10uF)

C15

0.1uF De-couple capacitor (0.01~10uF); see

FUNCTIONAL DESCRIPTION

C10

10uF

ALC

attack time constant; see

FIG. 9

*C7

5000pF anti-aliasing capacitor

C13, C14

passive

L.P.F.

; 3dB point : fc ¡Ü 1/2£k∗ 3KΩ ∗ C13 (where C13 = C14)

*VR1

10KΩ to attenuate the input signal from

SWH

or

SWF

, if use digital volume control, then do

not need a resistor between VR and

SPKP

@ where : " * " mark shows the requirement of the component can not be changed.

MX9 3002

7

FUNCTIONAL DESCRIPTION

. Clock Rate (REG4 bit(2))

. The clock rate (

MCLK

) must be set before user uses the function of the MX93002;

. Programmable clock rate :

1. 2.048MHz (Frame Sync. 8KHz);

2. 1.536MHz (Frame Sync. 8KHz);

. Data Format (REG4 bit(1,0))

. The data format must be set before user uses the function of the MX93002;
. Programmable Data Format

1. 16-bit linear data format. It can have 14-bit resolution and higher linearity than u/a-law format has;

2. 8-bit u-law data format;

3. 8-bit a-law data format;

. PCM CODEC

. The block includes

A/D

&

D/A

converters and all digital filters;

1.

A/D

&

D/A

Converters

A/D

Channel :
A. Input Range : 0 ~ 3Vpp (3Vpp as A/D 0dB full swing (0dBFS));
B. Digital Filters : For the purpose of out-of-band noise filtering, IIR digital filters are implemented on the
same chip ( >26dB / 60Hz; <1dB / 300Hz ~ 3.4KHz; >14dB / 3.6KHz ~ 4.6KHz; >32dB / >4.6KHz );

D/A

Channel :
A. Output swing : 0 ~ 3Vpp (3Vpp as D/A 0dB full swing (0dBFS));
B. Digital Filters :

a. G.711 specification;
b. The digital input applied to D/A converter can not be a DC signal other than idle (bits all zero), as
limit cycles in the embodiment method at a level of -70dBm will present at the analog output.

. Power Down Mode

. The MX93002 will recover from power-down mode when MCLK keeps a consistent clock (1.536 or 2.048MHz);
. Support system power (Adapter and Battery) detection. The function will work well even under 3V power supply;
. Support automatic power-down control when

MCLK

keeps high or low;

. Support 4 power-down modes for special applications:

MODE

FUNCTION

REG 6 (7,6)

(SLEEPA,SLEEP) = ( 0,0 )

REG 6 (7,6)

(SLEEPA,SLEEP) = ( 0,1 )

REG 6 (7,6)

(SLEEPA,SLEEP) = ( 1,0 )

REG 6 (7,6)

(SLEEPA,SLEEP) = ( 1,1 )

VBG

reference on off off on

POW

&

BAT

on off on on

all analog blocks off off off on

A/D and D/A off off off off

Table 1

MX9 3002

8

. 3-Channel Input (MIC,AUX1,LIN) with PRE-PGA (Pre-Programmable Gain Control)

. Input Range : 0 ~ AVDD-2Vpp;
.

PRE-PGA

gain step from 21dB to -15dB (21, 18, 15, 12, 9, 7.5, 6, 4.5, 3, 0, -3, -6, -9, -12, -15dB);

. Driving Capacity : more than 400uA at

FILT

and

AUX2

output;
. Input Impedance : more than 25KΩ;
. THD : less than 70dB at

FILT

output;
. There is just one path which can be selected at the same time;
. The gain setting of the path will be mapped to the

PRE-PGA

when user changes the path of Input.

. ALC (Automatic Level Control)

. Input Range : 0 ~ 1.2Vpp (Loop Gain : 40dB);
. Output Characteristic : see

FIG. 5

~

FIG. 7

;
. Loop Gain : 42dB max (with external RC time constant);
. Driving Capacity : more than 400uA at

FILT

and

AUX2

output;

. THD : less than 40dB at

FILT

output (Loop Gain : 40dB).

. AD1 PGA

. Input Range : 0 ~ AVDD-2Vpp;
.

AD1-PGA

can support gain step from 0dB to 18dB (0, 4, 8, 18dB);

. AD2 PGA

. Input Range : 0 ~ AVDD-2Vpp;
.

AD2-PGA

can support gain step from -6dB to 39dB (-6, -3, 0, 3, 6, 9, 12, 15, 18, 21, 24, 27, 30, 33, 36, 39dB);

. FILT as I/O Port

. Input Range : 0 ~ AVDD-2Vpp;
. Input Impedance : more than 1KΩ;
. Output Impedance : less than 1KΩ;
. Load Capacitance : 5000pF;

. AUX1 & AUX2 as I/O Port

. Input Range : 0 ~ AVDD-2Vpp;
. Input Impedance : more than 15KΩ;
. Output Impedance : less than 15KΩ;

. External passive L.P.F. (Low Pass Filter)

. External capacitors (

LPFC1

and

LPFC2

) can be changed to attenuate high frequency noise at

SPKP

and

SPKN

output;

. When external capacitors (

LPFC1

and

LPFC2

) are NC (no connection), then passive

L.P.F.

will be by-passed;

. Output of the Line Driver (

LOUTP

and

LOUTN

) can be chosen to pass or by-pass the

L.P.F.

;

.

LPFC1/LPFC2

can be a D/A output pin and output impedance is around 3KΩ/6KΩ;

3000mVpp

VOUT ( mVpp )

1000mVpp

10mVpp 1200mVpp

VIN ( mVpp )

MX9 3002

9

. Line Driver (

LIN-DRV

)

. Not only support the programmable gain from 0 to 22.5dB, but also fully differentially drive 6Vpp over 600Ω;
. If switches

SWE, SWJ, SWK

and

SWL

are opened, then the line driver will be muted to -70dB and power-down

automatically;

1. output swing : Single Ended (only use

LOUTP

or

LOUTN

) : 0 ~ 3Vpp (over 600Ω load, at LIN-DRV = 0dB);

Fully differential (use

LOUTP + LOUTN

) : 0 ~ 6Vpp (over 600Ω load, at LIN-DRV = 0dB);

2.

LIN-DRV

gain step from 0dB to 22.5dB (1.5dB/step);

3. THD : less than 70dB at 6Vpp output over 600Ω load;

. D/A PGA

. Input Range : 0 ~ AVDD-2Vpp;
.

DA-PGA

can support gain step from 0dB to 6dB (2dB/step);

. Attenuator (

ATT1

&

ATT2

)

. Speaker output signal can be attenuated either by internal register or external resistor;
. If switches

SWF

and

SWH

are opened, then attenuator will be muted to -70dB automatically;

1.

ATT1

(internal register) : 16 steps programmable, from -45dB to 0dB (-45, -39, -33, -27, -24, -21, -18, -15,

-12, -9, -7.5, -6, -4.5, -3, -1.5, 0dB);

2.

ATT2

(external variable resistor) : from -45 ~ 0dB (determined by external 10KΩ potentiometer);

3. THD : less than 70dB;

4. input range for

AUX2

: 0 ~ AVDD-2Vpp;

5. input impedance for

AUX2

: more than 15KΩ;

. Speaker Driver (SPK-DRV)

. If switches

SWF

and

SWH

are opened, then

SPK-DRV

will be power-down automatically;

1. Maximum output swing : 6Vpp with 8Ω load at fully differential output (

SPKP + SPKN

);

2. THD : less than 60dB (at 6Vpp/8Ω load);

. Voltage Reference (VREF & VAG)

. Two 2.25VW voltage references are on-chip generated, where

VREF

is for external circuit use and

VAG

is for
internal circuit use;
.

VREF

can be used to bias the microphone, the level shift circuit or other applications;

1.

VREF

driving capacity : more than 400uA;

2. User can use the

VREF

to provide DC bias to external components;

. Bandgap Reference (VBG)

. A bandgap circuit generates a voltage source (

VBG

) which is around 1.2VW. It is with low temperature
coefficient and good power supply rejection;
. If user changes VBG bypass capacitor (C15) then the MX93002 warm-up time will be changed; see

The Timing

Diagram of CODEC Function;

MX9 3002

10

. Serial Control Interface

. Use

SCLK

for synchronization with

SDATA

to read/write the internal control registers;

. All registers will keep original setting when the MX93002 returns from power-down or sleep mode;

1. When

SDENB

(serial data enable) signal active low, the MX93002 starts to receive serial control data

(

SDATA

);

2. Set

SDENB

from low to high when transmitting

SDATA

is complete;

3.

SDATA

format : 3 addresses from A2 to A0, 8 data from D7 to D0 (A2 is MSB and D0 is LSB);

. Two Comparators for System Applications (RING and CPC)

. To detect Ring and CPC (Calling Party Control) or other applications;

1. input range : 0 ~ AVDD-2Vpp (with 7V surge protection);

2. input impedance : more than 10^12Ω ;

3. input offset voltage : less than 10mV;

4. output impedance : less than 10KΩ;

5. slew rate : 3V/us max.;

. Switches

. There are three registers (REG0, REG3 and REG6) which are used to control all of the switches so that user
can direct many different signal paths, for examples:

1. Record signal from

MIC

and play signal to

SPKP/N

or play signal to

LOUTP/N

:

A. Record signal from

MIC

or Record signal from

LIN

:

a. System initialization [set

MIC

gain (REG2 bit(3~0)), set

LIN

gain (REG1 bit(7~4), set

ALC

gain

0/6dB (REG5 bit(1)) and set

A/D-PGA

gain (REG6 bit(1,0))]

b. Record signal from

MIC

: set REG0 = 0X0048

MIC

⇒

SWA

⇒

PRE-PGA ⇒ SWC (ALC

on) ⇒

SWD

⇒

AD1-PGA

⇒

PCM CODEC AIN1

c. Record signal from

LIN

: set REG0 = 0X00C8

LIN

⇒

SWA

⇒

PRE-PGA

⇒

SWC (ALC

on) ⇒

SWD

⇒

AD1-PGA

⇒

PCM CODEC AIN1

B. Play signal to

SPKP/N

or play signal to

LOUTP/N

:

a. System initialization [fix the value of

L.P.F.

, set (REG6 bit(5)), set

D/A-PGA

gain (REG6 bit(3,2), set

ATT1

gain (REG3 bit(3~0)) and

LIN-DRV

gain (REG1 bit(3~0))]

b. Play signal to

SPKP/N

(use digital volume control) : set REG 0 = 0X0003

PCM CODEC AOUT1

⇒

L.P.F.

⇒

SWF

⇒

DA-PGA ⇒ SWG (ATT1

) ⇒

SPK-DRV

⇒

SPKP/N

c. Play signal to

LOUTP/N

: set REG 0 = 0X0004

i.

PCM CODEC AOUT1

⇒

L.P.F.

⇒

SWL ⇒ LIN-DRV

⇒

LOUTP/N

ii.

PCM CODEC AOUT2

⇒

SWE

⇒

LIN-DRV

⇒

LOUTP/N

d. Play signal to

SPKP/N

(use digital volume control) and

LOUTP/N

: set REG 0 = 0X0007

i.

PCM CODEC AOUT1

⇒

L.P.F. ⇒ SWF

⇒

DA-PGA

⇒

SWG (ATT1

) ⇒

SPK-DRV

⇒

SPKP/N

PCM CODEC AOUT2

⇒

SWE

⇒

LIN-DRV

⇒

LOUTP/N

ii.

PCM CODEC AOUT1

⇒

L.P.F. ⇒ SWF

⇒

DA-PGA

⇒

SWG (ATT1

) ⇒

SPK-DRV

⇒

SPKP/N

⇒

SWL

⇒

LIN-DRV

⇒

LOUTP/N

MX9 3002

11

2. Room Monitoring:
A. System initialization [set

MIC

gain (REG2 bit(3~0)), set

ALC

gain 0/+6dB (REG5 bit(1)), set

LIN-DRV

gain (REG1 bit(3~0)), set REG3 bit(6,5) and set REG6 bit(1,0)]
B. Switches path:
a. Remote Monitoring:

MIC

⇒

SWA

⇒

PRE-PGA

⇒

SWC (ALC

on) ⇒

SWJ

⇒

LIN-DRV

⇒

LOUTP/N

b. Local Detecting DTMF:

LIN

⇒

SWI

⇒

AD1-PGA

⇒

PCM CODEC AIN1

3. Digital Speakerphone:
A. System Initialization [set

MIC

gain (REG2 bit(3~0)), set

AD1-PGA

gain (REG6 bit(1,0)), fix the value of

L.P.F.

, set

DA-PGA

gain (REG6 bit(3,2)), set

ATT1

gain (REG3 bit(3~0)), set

LIN

gain (REG1 bit(7~4)), set

SWM

REG4 bit(4), set

LIN-DRV

gain (REG1 bit(3~0))]
B. Switches path : set REG0 = 0X00AF
a. CODEC 1 : Record signal from

MIC

and Play signal to

SPKP/N

(use digital volume control)

MIC

⇒

SWA

⇒

PRE-PGA

⇒

SWC (ALC

off) ⇒

SWD

⇒

AD1-PGA

⇒

PCM CODEC AIN1

PCM CODEC AOUT1

⇒

L.P.F.

⇒

SWF ⇒ SWG (ATT1

) ⇒

SPK-DRV

⇒

SPKP/N

b. CODEC 2 : Record signal from

LIN

and Play signal to

LOUTP/N

LIN

⇒

SWM

⇒

AD2-PGA

⇒

PCM CODEC AIN2

PCM CODEC AOUT2

⇒

SWE

⇒

LIN-DRV

⇒

LOUTP/N

. Power Consumption (with 600Ω line load and 8Ω speaker load)

Max. Power
Consumption

Operation

LIN-DRV

Dis/Enable

SPK-DRV

Dis/Enable

Analog

circuits

Digital

circuits

Unit

Stand-by Disable Disable 27 8 mA

Operating

Disable

Enable

Disable

Enable

Disable
Disable

Enable
Enable

27

31
240
250

8
8
8
8

mA

Power-down Disable Disable 460 335 uA

Power-down with SLEEP = 1 Disable Disable 20 400 uA

@ Test condition : 1. at

LIN-DRV

(with 600Ω load) /

SPK-DRV

(with 8Ω load) full swing output

2. see

LIN-DRV

and

SPK-DRV

Descriptions

3. at the case of Temperature from -2¢J to 72¢J and Voltage from 4.4V to 5.6V