Digital Voice Systems AMBE-2000 Interface Manual

Digital Voice Systems, Inc.
The Speech Compression Specialists
Interfacing DVSI's AMBE-2000™ and AMBE-2020™ Vocoder Chips
The Analog Devices AD73311 codec chip presents a simple low cost solution for use with
DVSI's AMBE-2000™ or AMBE-2020™ vocoder chips. This application note provides
information on alternative methods of interfacing these components.

AD73311AR codec (using a 5 volt supply)

The block diagram in Figure 1 shows a sample interface between the AD73311 codec and
DVSI's AMBE-2000™ vocoder chip. When the AMBE-2000™ or AMBE-2020™ CODEC_SEL
bits (see AMBE-2000™ or AMBE-2020™ users manual) are set for the AD73311, the vocoder
chip sends configuration words to the codec and no other configuration actions required by the
user. Configuration words are listed in Table 1.
U1
27
CODEC_RX_CLCK
33
CODEC_TX_CLCK
37
CODEC_TX_STRB
29
CODEC_RX_STRB
31
CODEC_RX_DATA
41
CODEC_TX_DATA
AMBE-2000
Figure 1: The AMBE-2000™ Vocoder with the AD73311 CODEC
Register Address
(D10-D8)
0x1
CRB
0x2
CRC
0x3
CRD
0x0
CRA
Table 1: Configuration Data Sent to the AD73311 from the AMBE-2000 when CODEC_SEL [1-0]=01,b
AMBE-2000™ and AMBE-2020™ Vocoder Chip Interface Applications Note
234 Littleton Road
Westford, MA 01886 USA
with the Analog Devices AD73311 Codec
Configuration Data
(D7-D0)
0x13
0xF9
0x00
0x01
Page 1 of 4
Tel: (978) 392-0002
Fax: (978) 392-8866
U2
14 20
SCLCK SE
17 15
SDOFS MCLK
18 3
SDIFS AVDD1
16 9
SDO AVDD2
19 12
SDI DVDD
AD73311AR
Notes:
MCD = 1 Sets DMCLK=MCLK/2
SCD = 0 Sets SCLK=DMCLK/8
D7 = 1 5V EN On
D6 = 1 Reference Out Enabled
D5 = 1 Reference Power On
D4 = 1 DAC Power On
D3 = 1 ADC Power On
D0 = 1 Power On
Gain set to 0
D0 = 1 Puts CODEC in Data Mode
email: info@dvsinc.com
www.dvsinc.com
SERIAL PORT ENABLE (HIGH)
16.384 MHz
5 V
3.3 V
May 02