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參數(shù)資料
| 型號(hào)： | SSM2356CBZ-RL7 |
| 廠商： | Analog Devices Inc |
| 文件頁數(shù)： | 5/16頁 |
| 文件大小： | 0K |
| 描述： | IC AMP AUD 2X2W STER D 16WLCSP |
| 產(chǎn)品變化通告： | 8mm Carrier Tape Changes 28/Feb/2012 |
| 標(biāo)準(zhǔn)包裝： | 1 |
| 類型： | D 類 |
| 輸出類型： | 2 通道（立體聲） |
| 在某負(fù)載時(shí)最大輸出功率 x 通道數(shù)量： | 2.5W x 2 @ 4 歐姆 |
| 電源電壓： | 2.5 V ~ 5.5 V |
| 特點(diǎn)： | 消除爆音，差分輸入，短路和熱保護(hù)，關(guān)閉 |
| 安裝類型： | 表面貼裝 |
| 供應(yīng)商設(shè)備封裝： | 16-WLCSP |
| 封裝/外殼： | 16-WFBGA，WLCSP |
| 包裝： | 標(biāo)準(zhǔn)包裝 |
| 其它名稱： | SSM2356CBZ-RL7DKR |
Data Sheet
SSM2356
Rev. A | Page 13 of 16
APPLICATIONS INFORMATION
OVERVIEW
The SSM2356 stereo Class-D audio amplifier features a filterless
modulation scheme that greatly reduces the external component
count, conserving board space and, thus, reducing systems cost.
The SSM2356 does not require an output filter but, instead, relies
on the inherent inductance of the speaker coil and the natural
filtering of the speaker and human ear to fully recover the audio
component of the square wave output. Most Class-D amplifiers
use some variation of pulse-width modulation (PWM), but the
SSM2356 uses Σ-Δ modulation to determine the switching pattern
of the output devices, resulting in a number of important benefits.
Σ-Δ modulators do not produce a sharp peak with many harmonics
in the AM frequency band, as pulse-width modulators often do.
Σ-Δ modulation provides the benefits of reducing the amplitude
of spectral components at high frequencies, that is, reducing EMI
emission that might otherwise be radiated by speakers and long
cable traces. Due to the inherent spread-spectrum nature of Σ-Δ
modulation, the need for oscillator synchronization is eliminated
for designs incorporating multiple SSM2356 amplifiers.
The SSM2356 also integrates overcurrent and temperature
protection.
GAIN SELECTION
The preset gain of SSM2356 can be selected between 6 dB and
18 dB with no external components and no change to the input
impedance. A major benefit of fixed input impedance is that
there is no need to recalculate input corner frequency (Fc)
when gain is adjusted. The same input coupling components
can be used for both gain settings.
It is possible to adjust the SSM2356 gain by using external resistors
at the input. To set a gain lower than 18 dB (or 6 dB when
GAIN = GND), refer to Figure 34 for the differential input
configuration and Figure 35 for the single-ended configuration.
Calculate the external gain configuration as follows:
When GAIN = GND (6 dB default gain setting)
External Gain Settings = 160 k/(80 k + REXT)
When GAIN = VDD (18 dB default gain setting)
External Gain Settings = 640 k/(80 k + REXT)
Please note that when using external resistors to adjust the gain
from the 18 dB setting (GAIN = VDD) to maintain optimal audio
performance, it is not recommended to use external series resistors
larger than 10 k due to increased noise floor and reduced
THD+N performance.
POP-AND-CLICK SUPPRESSION
Voltage transients at the output of audio amplifiers may occur
when shutdown is activated or deactivated. Voltage transients
as low as 10 mV can be heard as an audio pop in the speaker.
Clicks and pops can also be classified as undesirable audible
transients generated by the amplifier system and, therefore, as
not coming from the system input signal.
Such transients may be generated when the amplifier system
changes its operating mode. For example, the following can be
sources of audible transients:
System power-up/power-down
Mute/unmute
Input source change
Sample rate change
The SSM2356 has a pop-and-click suppression architecture that
reduces these output transients, resulting in noiseless activation and
deactivation.
EMI NOISE
The SSM2356 uses a proprietary modulation and spread-
spectrum technology to minimize EMI emissions from the
device. For applications having difficulty passing FCC Class B
emission tests, the SSM2356 includes a modulation select pin
(ultralow EMI emission mode) that significantly reduces the
radiated emissions at the Class-D outputs, particularly above
100 MHz. Figure 36 shows SSM2356 EMI emission tests per-
formed in a certified FCC Class-B laboratory in normal
emissions mode (EDGE = GND). Figure 37 shows SSM2356
EMI emission with EDGE = VDD, placing the device in low
emissions mode.
60
0
10
20
30
40
50
30
130
230
330
430
530
630
730
830
930 1000
(d
B
V)
FREQUENCY (MHz)
[1] HORIZONTAL
[2] VERTICAL
FCC CLASS-B LIMIT
08084-
005
Figure 36. EMI Emissions from SSM2356, 1-Channel, 12 cm Cable,
EDGE = GND
60
0
10
20
30
50
30
130
230
330
430
530
630
730
830
930 1000
(d
B
V)
FREQUENCY (MHz)
[1] HORIZONTAL
[2] VERTICAL
FCC CLASS-B LIMIT
40
08084-
006
Figure 37. EMI Emissions from SSM2356, 1-Channel, 12 cm Cable,
EDGE = VDD
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