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C0603X7R100-104M Datasheet(PDF) 10 Page - Silicon Laboratories |
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C0603X7R100-104M Datasheet(HTML) 10 Page - Silicon Laboratories |
10 / 36 page Si2493/57/34/15/04 Global ISOmodem-EVB 10 Rev. 0.7 2.1.9. Direct Access Interface While the motherboard supplies power through J8, J9, or USB, power-on reset, and an RJ–11 jack for the modem, the direct access interface (J103) is used to connect the motherboard to an embedded system. J103 provides access to all Si2493/57/34/15/04 signals available on the daughter card. It is necessary to remove the jumper on JP23 to disable both the RS-232 and USB interface and prevent signal contention. 2.1.10. PCM Interface (24-Pin FT Only) The Si2493/57/34/15/04 PCM interface can be demonstrated using the voice motherboard, not with this EVB. 2.1.11. AOUT Call Progress Audio Output Call progress audio output is provided by the Si2493/57/ 34/15/04 on the AOUT pin as a PWM signal. This signal allows the user to monitor call progress signals, such as dial tone, DTMF dialing, ring, busy signals, and modem negotiation. Control of this signal is provided by AT commands and register settings described in the introduction. The AOUT signal is connected to an on board amplifier, for a high-quality output. AOUT can also be connected to a summing amplifier or multiplexer in an embedded application as part of an integrated audio system. 2.1.11.1. AOUT Audio Processing The AOUT signal discussed in this section leaves the Si2493/57/34/15/04 is processed (demodulated) by a high pass filter: (R133,134,135, and C24, C25, 26, C27). It is critically important to not put a dc load on the AOUT pin since the pin also acts as a modem feature control on reset and is internally weakly pulled up. Any unintentional dc load on AOUT prevents proper operation of the modem. See “AN93: Si3457/34/15/04 Modem Designer’s Guide” for more details on the features controlled by pin strapping. Since this PWM signal swings rail to rail and is simply filtered by a low pass filter to acquire the audio. It is important to keep the power supply to the modem free of noise in the audio spectrum. 2.1.11.2. The Audio Output Amplifier (LM4819) The Power amplifier on the EVB is powered by a current limited 4.2 V supply. The current limit is implemented in the EVB because it is intended for HW/SW development and is not needed for a production design. This amplifier can drive an 8 speaker with 200 mW of Call progress audio (i.e., ISOmodem's call progress dialing and negotiation tones). The power amplifier itself is a low cost, rugged H bridge type device. There are several pin compatible designs from multiple vendors that can provide alternate price/ power tradeoffs for this amplifier. This power amp can be shut down by removing jumper JP12. The signal at JP12 can also be tied to a control signal to allow the host to shut down the amplifier. The customer can change the values of R172 and R173 when integrating the EVB to his system, but should keep the RC formed by C37 and R173 at a 50 Hz or higher corner to avoid a power-on thump. 2.1.11.3. The Call Progress Speaker The Call progress speaker, Regal RE-2308-NL is connected to the amplifier via a jumper, JP14. If another speaker is to be connected then it is necessary to remove JP14 and connect the external speaker to JP11, Pins 1 and 4. It is important to remember that the speaker signal is differential. Both the output pins are driven outputs and must not be grounded. Table 3. DB9 Pin Connections J1 Name J1 Symbol J1 Pin Si2493/57/34/15/ 04 Pin Si2493/57/34/15/ 04 Name Carrier Detect CD 1* See note DCD/EESD Received Data RXD 2 9 RXD Transmit Data TXD 3 10 TXD Data Terminal Ready DTR 4* See note ESC/RI Signal Ground SG 5 6 GND Data Set Ready DSR 6* See note INT/AOUT Ready to Send RTS 7* See note RTS/RXCLK Clear to Send CTS 8 11 CTS Ring Indicator RD 9* 17 RI *Note: JP6 jumper option. |
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