SSM2250RMZ-REEL Analog Devices Inc, SSM2250RMZ-REEL Datasheet - Page 8

IC AMP AUDIO PWR 1.5W AB 10MSOP

SSM2250RMZ-REEL

Manufacturer Part Number
SSM2250RMZ-REEL
Description
IC AMP AUDIO PWR 1.5W AB 10MSOP
Manufacturer
Analog Devices Inc
Series
SoundMAX®r
Type
Class ABr
Datasheet

Specifications of SSM2250RMZ-REEL

Output Type
1-Channel (Mono) with Stereo Headphones
Max Output Power X Channels @ Load
1.5W x 1 @ 8 Ohm; 90mW x 2 @ 32 Ohm
Voltage - Supply
2.7 V ~ 6 V
Features
Depop, Shutdown
Mounting Type
Surface Mount
Package / Case
10-MSOP, Micro10™, 10-uMAX, 10-uSOP
Operational Class
Class-AB
Audio Amplifier Function
Headphone/Speaker
Total Harmonic Distortion
0.2@1.5W%
Single Supply Voltage (typ)
3/5V
Dual Supply Voltage (typ)
Not RequiredV
Power Supply Requirement
Single
Unity Gain Bandwidth Product (typ)
4MHz
Rail/rail I/o Type
Rail to Rail Output
Single Supply Voltage (min)
2.7V
Single Supply Voltage (max)
6V
Dual Supply Voltage (min)
Not RequiredV
Dual Supply Voltage (max)
Not RequiredV
Operating Temp Range
-40C to 85C
Operating Temperature Classification
Industrial
Mounting
Surface Mount
Pin Count
10
Package Type
MSOP
Lead Free Status / RoHS Status
Lead free / RoHS Compliant

Available stocks

Company
Part Number
Manufacturer
Quantity
Price
Part Number:
SSM2250RMZ-REEL
Manufacturer:
ADI
Quantity:
14 452
SSM2250
The output coupling capacitor creates a high-pass filter with a
cutoff frequency of
where:
R
C
Although a majority of headphones have approximately 80 Ω of
resistance, the resistance can vary between models and manu-
facturers. Headphone resistances are commonly between 32 Ω
to 600 Ω. Using a 220 μF capacitor, as shown in Figure 14, the
worst-case −3 dB corner frequency would be 22 Hz, with a 32 Ω
headphone load. Smaller output capacitors could be used at the
expense of low frequency response to the headphones.
An input coupling capacitor should be used to remove dc bias
from the inputs to the SSM2250. Again, the input coupling
capacitor in combination with the input resistor creates a high-
pass filter with a corner frequency of
Using the values shown in Figure 14, where R1 = 20 kΩ and
C1 = 1 μF, creates a corner frequency of 8 Hz. This is acceptable,
as the PC99 audio requirement specifies the computer audio
system bandwidth to be 20 Hz to 20 kHz.
Pin 10 on the SSM2250 provides the proper bias voltage for
the amplifiers. A 0.1 μF capacitor should be connected here to
reduce sensitivity to noise on the power supply. A larger capaci-
tor can be used if more rejection from power supply noise is
required.
L
C
is the resistance of the headphone.
is the output coupling capacitor.
f
f
3
3
dB
dB
=
=
2
2
π
π
R
R
1
1
L
1
C
C
1
C
SHUTDOWN
RIGHT IN
LEFT IN
1μF
1μF
20kΩ
R1
20kΩ
R1
NC
NC
Figure 14. Typical Application
1
2
3
4
5
6
7
SSM2250
Rev. A | Page 8 of 12
NC = NO CONNECT
20kΩ
(2)
(3)
R2
20kΩ
R2
14
13
12
11
10
9
8
The SSM2250 has excellent phase margin and is stable even
under heavy loading. Therefore, a feedback capacitor in parallel
with R2 is not required, as it is in some competitors’ products.
Power Dissipation
An important advantage in using a bridged output configura-
tion is that bridged output amplifiers are more efficient than
single-ended amplifiers in delivering power to a load.
Using Equation 4 and the power derating curve in Figure 17,
the maximum ambient temperature can be easily found. This
ensures that the SSM2250 does not exceed its maximum
junction temperature of 150°C.
The power dissipation for a single-ended output application
where an output coupling capacitor is used is shown in
Figure 16.
NC
NC
10μF
5V
P
220μF
DISS
+
1.50
1.25
1.00
0.75
0.50
0.25
Figure 15. Power Dissipation vs. Output Power in BTL Mode
+
5V
BTL
OUT
220μF
0
,
+
100kΩ
0
MAX
1kΩ
1kΩ
V
DD
=
= 5V
2
π
0.25
V
2
NC
DD
R
L
2
R
L
0.50
= 16Ω
OUTPUT POWER (W)
0.75
R
R
L
L
1.00
= 4Ω
= 8Ω
1.25
1.50
(4)

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