User`s manual

AMBE-3000™-HDK Development Board
User’s Manual Version 1.1
Section 2 –
Page 7
DVSI Confidential Proprietary
Connectors, Test Points & Indicators
Figure 6 Audio Connections
Handset
If a handset is used instead of the 2 wire interface, use a standard telephone handset to connect to the
RJ11 handset connector. Be sure that the handset cord is less than 12 inches long (included in the
optional accessories kit) when not stretched. This will help reduce noise from being introduced into the
voice signal. The AMBE-3000™-HDK Development Board always outputs the audio to both the 4-Wire
and Handset output regardless of which voice source is selected.
3.5mm Jacks
The AMBE-3000™-HDK Development Board provides two 3.5 mm jacks (see Figure 6 Audio
Connections) for the input and output of analog mono audio. A typical analog audio input connection for
the HDK would be to connect the audio Line output of an audio component such as, a Digital Tape,
player or even a PC sound card output to the Analog Input jack (audio cables not included) of the
AMBE-3000™-HDK Development Board. The AMBE-3000™-HDK Development Board outputs the
analog signal on the output 3.5 mm jack that may be connected to an amplifier or Audio In jack on a PC
sound card. The unit always outputs the audio to both the 4-Wire and Handset output regardless of the
voice source selected.
RS-232 Connections
There are two RS-232 I/O connections on the HDK board. (see Figure 7 RS-232 Serial Connections)
Connector P2 (µ-controller RS-232) is the Input/Output that can be connected to the HDK’s P1
connector using a null modem jumper cable to utilize the AMBE-3000™ Vocoder Chip’s UART
Interface. Alternatively, the P2 connector can be used to communicate to another HDK board’s P2
connector for full duplex communications between two HDKs. This interface transfers data to/from the
MSP µcontroller. The second serial port Connector P1 (AMBE-3000™ Vocoder Chip RS-232) on the
HDK connects directly to/from the UART interface of the AMBE-3000™ Vocoder Chip.
Figure 7 RS-232 Serial Connections
µ Controller RS-232 Connection (P2)
The P2 connection on the HDK Board is an asynchronous RS-232 interface for connecting directly to a
serial device or another HDK Board. The P2 connector is connected to the µ-controller on the HDK. To
connect the µ-controller to the UART Interface of the AMBE-3000™ Vocoder Chip a null modem serial
cable is used between P1 and P2.