US Robotics USR3500 Especificaciones descargar pdf (Pagina 27)

Rev 1.0 1/27/14 27

Reference Guide

Interfaces

* The input voltage depends of the input micro gain set by AT command. Refer to the AT Commands Interface

Guide at http://www.usr.com/support/3500.

** Because CMICxP is internally biased, it is necessary to use a coupling capacitor to connect an audio signal

provided by an active generator. Only a passive microphone can be directly connected to the CMICxP and CMICxN inputs.

Refer to the following table for the list of recommended microphone characteristics.

Table 12. Recommended Microphone Characteristics

Feature

Values

Type

Electret 2V/0.5 mA

Impedance

Z = 2kΩ

Sensitivity

-40dB to -50dB

SNR

> 50dB

Frequency response

Compatible with GSM specifications

3.1.2.5.2. Speaker

The speaker outputs are connected in differential mode to reject common mode

noise and TDMA noise.

Speaker outputs are connected to internal push-pull amplifiers and may be loaded

down with components between 32 – 150Ω and up to 1nF. These outputs may be

directly connected to a speaker.

The output power may be adjusted by 2dB steps. The gain of the speaker outputs is

internally adjusted and may be tuned using the AT+VGR command. Furthermore,

the digital gain can be adjusted using AT+WDGR. Refer to the AT Commands

Interface Guide at http://www.usr.com/support/3500 for more information about these

AT commands.

The following table shows the pin assignments of the speaker output.

Table 13. Speaker Outputs Pin Description for USR3500

(Sub D

15-pin)

Pin #

Signal

I/O

I/O Type

Description

CSPK1P

Analog

Speaker positive output

CSPK1N

Analog

Speaker negative output

1 2 ... 22 23 24 25 26 27 28 29 30 31 32 ... 62 63

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