US Robotics USR3500 Spécifications télécharger pdf (Page 28)

Rev 1.0 1/27/14 28

Reference Guide

Interfaces

Figure 19. Equivalent Circuit of CSPK

Table 14. Electrical Characteristics of CSPK for USR3500

Parameters

Min

Typ

Max

Unit

Biasing voltage

CSPKxP and CSPKxN

-1.5

1.5

Output swing

voltage

RL=16Ω: AT+VGR=-1600*; single-ended

1.7

Vpp

RL=32Ω: AT+VGR=-1600*; single-ended

1.9

2.75

Vpp

Load resistance

14.5

IOUT

Output current; peak value; RL=16Ω

Output current; peak value; RL=32Ω

POUT

RL=16Ω; AT+VGR=-1600*

RL=32Ω; AT+VGR=-1600*

RPD

Output pull-down resistance at power-down

kΩ

* The output voltage depends of the output speaker gain set by AT command. Refer to the AT Commands

Interface Guide at http://www.usr.com/support/3500. This value is given in dB, but it’s possible to toggle this to index value.

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

Table 15. Recommended Speaker Characteristics

Feature

Values

Type

10mW, electro-magnetic

Impedance

Z = 30 to 50Ω

Sensitivity

110dB SPL min. (0dB = 20µPa)

Frequency response

Compatible with GSM specifications

1 2 ... 23 24 25 26 27 28 29 30 31 32 33 ... 62 63

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US Robotics USR3500 Spécifications Page 28

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