
Figure 19. Equivalent Circuit of CSPK
Table 14. Electrical Characteristics of CSPK for USR3500
RL=16Ω: AT+VGR=-1600*; single-ended
RL=32Ω: AT+VGR=-1600*; single-ended
Output current; peak value; RL=16Ω
Output current; peak value; RL=32Ω
Output pull-down resistance at power-down
* 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
110dB SPL min. (0dB = 20µPa)
Compatible with GSM specifications
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