Altec gsm socket al7024s Manuale Utente
AL7020S, AL7024S Designer’s Guide
Doc. No. DG_7024E
Altec Electronic AG
Seite 12 / 32
Table 3-3. Signal Descriptions (Cont'd)
Label
I/O Type
Signal Name/Description
LED driver lines are open-drain inverter-driven (74HCT05) lines with 1.5 KΩ, 1/10W pull-up resistors.
GSM LED
OG
GSM activity LED. active low !
connect LED to 5V with resistor in series.
connect LED to 5V with resistor in series.
GPRS LED
OG
GPRS activity LED. active low !
connect LED to 5V with resistor in series.
connect LED to 5V with resistor in series.
Audio/Headset Interface
MICV I(DA)
Microphone Voice Input. MICV is a single-ended microphone
input from the analog switch circuit. The maximum input to the
MICV pin before there is signal distortion in the network is
12mVRMS.
input from the analog switch circuit. The maximum input to the
MICV pin before there is signal distortion in the network is
12mVRMS.
SPKR O(DF)
Speaker Output. SPKR is a single-ended output.
AGND PWR
Analog Ground. Analog Ground related to MICV Input.
Notes:
1. I/O types:
I(DA) = Analog input (see Table 3-5).
O(DD),O(DF) = Analog output (see Table 3-5).
IO(DX) = Analog input/output (see Table 3-5).
1. I/O types:
I(DA) = Analog input (see Table 3-5).
O(DD),O(DF) = Analog output (see Table 3-5).
IO(DX) = Analog input/output (see Table 3-5).
Table 3-4. Analog Electrical Characteristics
Name
Type
Characteristic
Value
SPKR
O(DF)
Recommended characteristics for
the speaker:
Impedance: 32 Ω (handset)
Power: 10mW
Sound Pressure.: 110dB
MICV
I(DA)
Recommended characteristics for
the microphone:
Bias Voltage: 2.2V ( 0.5mA )
Impedance: 2 KOhms
Sensitivity: –40 to –50dB
SNR: > 50dB