GR47/48 Design Guidelines
BA/SEM/MS 03:0015 Rev A
LZT 123 7596
17
It is also used as an ear-piece driver for the Portable Hands Free
accessory.
Zout
4
(0.3 – 3.5 kHz)
≅
120
Ω
Output capacitance
2.2
µ
F
Drive capability into 5 k
Ω
(0.3 – 3.5 kHz)
> 2.4 Vpp [TBC]
Drive capability into1.5 k
Ω
(0.3 – 3.5 kHz)
> 2.2 Vpp [TBC]
Levels
5
(THD<5%)
Drive capability into 150
Ω
(at 1 kHz)
> 1.3 Vpp [TBC]
Table 2. AFMS Levels. Audio Levels
3.6 RF and antenna Integration
The rules for RF and antenna integration are general good practice
guidelines i.e.
•
Ensure the antenna is a good 50
Ω
match across the GSM 900/1800
bands for GR47 and GSM 850/1900 bands for GR48.
•
Antenna installation should be, where possible, not close to large
metal objects as this will affect the matching mentioned above.
•
A specifically designed antenna for the GSM signals being
operated at will ensure the best reception.
If these are followed there should be no issues in terms of RF. For a
more extensive guide please see the integrators manual.
Please also see section 6.6 regarding SAR.
4
Output impedance includes impedance of EMC filter which is 100
Ω
.
5
Need to check output drive levels with 100R EMI filter.
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