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Enfora Enabler IIIG M2M
Modem Integration Guide
6.6.19. Headset Speaker Output Left & Right (Pins 57, 59)
Pin Name
Pin Number
Signal Direction
Description
HSOL
57
O
Headset Out 32
Ω
Speaker Left
HSOR
59
O
Headset Out 32
Ω
Speaker Right
HSOVMID
61
I
Headset Out pseudo ground return
The left and right headset amplifiers provide the stereo signal on terminals HSOL and HSOR. A pseudo
ground is provided on terminal HSOVMID to eliminate external capacitors. The mono audio signal can be
provided on the Right or the Right and Left headset outputs. HSOVMID is available to allow integrators to
supply a bias or DC offset to increase the dynamic range of the Headset.
Headset Spkr Output
Parameter/Conditions
Min
Typ
Max
Units
Maximum Swing
Distortion
≤
2% and 32
Ω
, VSP
input level = +3 dBm0
1.6
1.96
V
P-P
Distortion
≤
2% and 32
Ω
, I
2
S
input level = +3 dBm0
1.48
1.85
Maximum Capacitive
Load
100
pF
Minimum resistive load
at HSOL and HSOR:
Zload
32
Ω
Amplifier Gain
-5
dB
HSOL/R amplifier Power
supply rejection
1 kHz, 100 mVpp
50
dB
Amplifier State in Power
Down
High Z
The left and right channels of the headset speaker output are a single ended output. An external audio
amplifier should be used for loads of less than 32
Ω
or if volume is inadequate.
6.6.20. Headset Output Common Mode (Pin 61)
The left and right headset amplifiers provide the stereo signal on terminals HSOL and HSOR. A pseudo
ground is provided on terminal HSOVMID to eliminate external capacitors.
HSOVMID
Parameter/Conditions
Min
Typ
Max
Units
Maximum Capacitor
Load
200
pF
DC Level
1.2
1.35
1.5
V
GSM0308IG002
53
Version 1.05 – 11/13/08