
Enfora Enabler III-G
Modem Integration Guide
6.6.23. Handset Speaker Output (Pins 71, 73)
Pin Name
Pin Number
Signal Direction
Description
EARP
71
O
Earphone positive output
EARN
73
O
Earphone negative output
The earphone amplifier provides a full differential signal on the terminals EARP and EARN (Earphone).
Handset Spkr Output
Parameter/Conditions
Min
Typ
Max
Units
Output Swing 3.9 V
PP
120
Ω
Maximum Differential
Resistive Load
Output Swing 1.5 V
PP
33
Ω
Maximum Differential
Capacitive Load
100
pF
Common Mode
Minimum Resistive Load
At Internal Speaker (+) or (-)
200 k
Ω
Common Mode
Maximum Capacitive
Load
At Internal Speaker (+) or (-)
50
pF
Amplifier Gain
EARG = 1
EARG = 0
1
-11
DB
dB
Parameter
Test Conditions
Min
Typ
Max
Units
Distortion
≤
2% and 120
Ω
, VSP input
level = +3 dBm0, amp gain = -11 dB
0.98
Distortion
≤
2% and 33
Ω
, VSP input level
= -5.34 dBm0, amp gain = -11 dB
0.38
Distortion
≤
2% and 120
Ω
, I2S input level
= +3 dBm0, amp gain = -11 dB
0.93
Distortion
≤
2% and 120
Ω
, VSP input
level = +3 dBm0, amp gain = 1 dB
3.1 3.92
Distortion
≤
2% and 33
Ω
, VSP input level
= -5.34 dBm0, amp gain = 1 dB
1.2 1.5
Earphone output swing at
EARP-EARN
Distortion
≤
2% and 120
Ω
, I2S input level
= +3 dBm0, amp gain = 1 dB
2.96
3.7
V
P-P
EARG = 1
1
dB
Earphone amplifier gain
EARG = 0
-11
dB
Earphone amplifier state in
power down
High
Z
Earphone amplifier power
supply rejection
1 kHz, 100 mVp-p
50
dB
An external audio amplifier should be used for loads of less than 16
Ω
or if volume is inadequate.
GSM0308PB001
51
Version DRAFT – 2/9/2007