The Speech Compression Specialists
Digital Voice Systems, Inc.
234 Littleton Road Tel: (978) 392-0002 email: info@dvsinc.com
Westford, MA 01886 USA Fax: (978) 392-8866 www.dvsinc.com
Interfacing DVSI’s AMBE-2000™ and AMBE-2020™ Vocoder Chips
with the Analog Devices AD73311 Codec
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.
5 V
3.3 V
SERIAL PORT ENABLE (HIGH)
16.384 MHz
U1
AMBE-2000
27
33
37
29
31
41
CODEC_RX_CLCK
CODEC_TX_CLCK
CODEC_TX_STRB
CODEC_RX_STRB
CODEC_RX_DATA
CODEC_TX_DATA
U2
AD73311AR
14
17
18
16
19
20
15
3
9
12
SCLCK
SDOFS
SDIFS
SDO
SDI
SE
MCLK
AVDD1
AVDD2
DVDD
Figure 1: The AMBE-2000™ Vocoder with the AD73311 CODEC
Register Address
(D10-D8)
Configuration Data
(D7-D0)
Notes:
0x1
CRB
0x13
MCD = 1 Sets DMCLK=MCLK/2
SCD = 0 Sets SCLK=DMCLK/8
0x2
CRC
0xF9
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
0x3
CRD
0x00 Gain set to 0
0x0
CRA
0x01 D0 = 1 Puts CODEC in Data Mode
Table 1: Configuration Data Sent to the AD73311 from the AMBE-2000 when CODEC_SEL [1-0]=01,b
Page 1 of 4
AMBE-2000™ and AMBE-2020™ Vocoder Chip Interface Applications Note May 02
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