Digital Voice Systems AMBE-2000 Handbuch

The Speech Compression Specialists

Digital Voice Systems, Inc.

234 Littleton Road Tel: (978) 392-0002 email: [email protected]

Westford, MA 01886 USA Fax:(978) 392-8866www.dvsinc.com

Using DVSI’s AMBE-2000™ and AMBE-2020™ Vocoder Chips with the

Texas Instruments’ TLV320AIC10 General Purpose CODEC

The Texas Instruments’ TLV320AIC10 codec presents a simple low cost solution for use with

DVSI’s AMBE-2000™ or AMBE-2020™ vocoder chips. This application note provides

information on interfacing these components. Figure 1 shows a sample block diagram interface,

between the TLV320AIC10 codec and DVSI’s AMBE-2000™ vocoder chip.

SERIAL

DATA

VOICE_*RESET

VDD

SCLK

VDD

16.384 MHz

CODEC Configuration

*SEE DETAIL

BELOW

AMBE-2000

AVDD

U27

TLV320AIC10

*RESET

DOUT

DIN

ALTIN

AURXCP

AURXM

AURXFP

AVDD1

AVDD2

AVSS

DCSI

DTXIM

DTXIP

DTXOM

DTXOP

DVDD1

DVDD2

DVSS

FILT

FLAG

FSD

INM

INP

MCLK

M/*S

OUTM

OUTP

*PWRDWN

SCLK

VMID

CODEC_TX_DATA

CODEC_TX_CLK

CODEC_RX_CLK

CODEC_RX_STRB

CODEC_TX_STRB

CODEC_RX_DATA

VDD

Figure 1: AMBE-2000™ and TLV320AIC10 sample block diagram

Configuration:

To configure the AMBE-2000™ for operation with the TLV320AIC10, set the CODEC_SEL

pins on the AMBE-2000™ vocoder chip to work with a generic 16 bit linear 8 kHz codec as

follows:

CODEC_SEL [1-0] (pins 85,84) = 00b

page 1 of 4

Interfacing AMBE-2000™ and AMBE-2020™ Vocoder Chips with TI’s TLV320AIC10 CODEC Rev 1 Oct ‘02

Initialization Procedure:

The control registers in the TLV320AIC10 codec must be initialized for proper operation.

The recommended procedure is to initialize the TLV320AIC10 by writing data to its 4 control

registers through the DCSI port, while the AMBE-2000™ is held in reset. The timing for the

DCSI port is shown in Figure 2.

Note that the Device Address (D14-D12) is normally set to 0 unless multiple codec devices

are used in cascade. Be sure that the stop bit is at least 2 clock pulses long between data

words as shown in the timing diagram. Shift the control words into the device 1 bit at a time

at the rate of SCLK.

Various configuration data can be used to control the operation of the TLV320AIC10 codec

(see the data sheet for more information), however for reference the AMBE-2000™ has

been tested with the TLV320AIC10 configured using the register values shown in Table 1.

Once the TLV320AIC10 is configured, the AMBE-2000™ should be taken out of reset to

begin communication with the codec.

The logic connected to the DCSI port does not have to be disabled. The user can make

adjustments to the configuration as needed (for example ADC and DAC gain). A reset to

the TLV320AIC10 codec will reset all of the internal registers. As a result, the TLV320AIC10

must be reconfigured following a reset.

Figure 2: TLV320AIC10 configuration timing via DCSI port

page 2 of 4

Interfacing AMBE-2000™ and AMBE-2020™ Vocoder Chips with TI’s TLV320AIC10 CODEC Rev 1 Oct ‘02

(D11-D9)

Configuration Data

(D7-D0) Notes:

0x1 0x11

D4=1: select AUXP AND AUXM for ADC

(Handset) D5=0: enable antialiasing filter

D0=1: select 16 BIT data Format for DAC

0x2 0x08

D7=0: select normal Operation

D4-D0=8: set Frequency Divider N=8

0x3 0x01

D7-D6=0: default operation

D0=1: 16-Bit data format for ADC

0x4 0x00

D7-D4=0: ADC input gain = 0 dB

D3-D0=0: DAC output gain = 0 dB

Gain values can be adjusted as needed.

Table 1: Recommended TLV320AIC10 Configuration Data

SHIFT

U8A

1 2

AND4

VDD

CNTL_DATA [15:0]

SCLK

CLR

CLK

D_IN [15:0]

Serial Out

LS_IN

CLK

AIC_LOAD

AIC_CTRL

U6A

1 2

COUNT

AIC_LOAD

U7A

1 2

LOAD

CLK_EN

U5A

1 2

Figure 3: TLV320AIC10 Codec Configuration Detail

Reference Materials:

AMBE-2000™ or AMBE-2020™ Vocoder chips Users Manual:

http://www.dvsinc.com/literature.htm

TLV320AIC10 Data Sheet:

http://www-s.ti.com/sc/ds/tlv320aic10.pdf

TLV320AIC10 EVM User’s Guide:

http://www-s.ti.com/sc/psheets/slwu003d/slwu003d.pdf

Application Report – Understanding Data Converters:

http://www-s.ti.com/sc/psheets/slaa013/slaa013.pdf

page 3 of 4

Interfacing AMBE-2000™ and AMBE-2020™ Vocoder Chips with TI’s TLV320AIC10 CODEC Rev 1 Oct ‘02

TLV320AIC10 Reference Schematic (Analog Section)

TLV320AIC10 1

Analog

12Tuesday, October 01, 2002

Title

Size Document Number Rev

Date: Sheet of

R12

220K

100K R6

20K

R14

4.7K

U1A

AD8544

411

820pF

10K

3.3VA

2 nF

200pF

R13

5.6K

10K

3.3VA

R15

10K

R11

10K

220

10K

10uF

3VA

0.1uF

10uF

3.3VA

Handset

100K

U1B

20K

R10

10K

VMID

AURXFP

VOICEOUTM

AURXCP

VOICEOUTP

AURXM

page 4 of 4

Interfacing AMBE-2000™ and AMBE-2020™ Vocoder Chips with TI’s TLV320AIC10 CODEC Rev 1 Oct ‘02

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