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參數(shù)資料
| 型號： | SSM3302ACPZ-R7 |
| 廠商： | Analog Devices Inc |
| 文件頁數(shù)： | 9/20頁 |
| 文件大小： | 0K |
| 描述： | IC AUDIO AMP STEREO 40LFCSP |
| 標準包裝： | 1 |
| 類型： | D 類 |
| 輸出類型： | 2 通道（立體聲） |
| 在某負載時最大輸出功率 x 通道數(shù)量： | 36.6W x 1 @ 2 歐姆; 24W x 2 @ 4 歐姆 |
| 電源電壓： | 7 V ~ 18 V |
| 特點： | 消除爆音，差分輸入，短路和熱保護，關閉 |
| 安裝類型： | 表面貼裝 |
| 供應商設備封裝： | 40-LFCSP-WQ（6x6） |
| 封裝/外殼： | 40-WFQFN 裸露焊盤，CSP |
| 包裝： | 標準包裝 |
| 其它名稱： | SSM3302ACPZ-R7DKR |
Data Sheet
SSM3302
Rev. A | Page 17 of 20
Because the mono mode uses output sense circuitry attached to
the left channel outputs, run PCB traces directly from the speaker
to the left channel outputs and then extend the PCB traces to
the right channel outputs.
OUTPUT MODULATION DESCRIPTION
The SSM3302 uses three-level, Σ-Δ output modulation. Each
output can swing from PGND to PVDD and vice versa. Ideally,
when no input signal is present, the output differential voltage is
0 V because there is no need to generate a pulse. In a real-world
situation, however, there are always noise sources present.
Due to this constant presence of noise, a differential pulse is
occasionally generated in response to this stimulus. A small
amount of current flows into the inductive load when the
differential pulse is generated. However, most of the time, the
output differential voltage is 0 V. This feature ensures that the
current flowing through the inductive load is small.
When the user sends an input signal, an output pulse is generated
to follow the input voltage. The differential pulse density is
increased by raising the input signal level. Figure 39 depicts three-
level, Σ-Δ output modulation with and without input stimulus.
Figure 39. Three-Level, Σ-Δ Output Modulation With and
Without Input Stimulus
LAYOUT
As output power increases, care must be taken to lay out PCB traces
and wires properly among the amplifier, load, and power supply;
a poor layout increases voltage drops, consequently decreasing
efficiency. A good practice is to use short, wide PCB tracks to
decrease voltage drops and minimize inductance. For lowest DCR
and minimum inductance, ensure that track widths are at least
200 mil for every inch of length and use 1 oz. or 2 oz. copper. Use
large traces for the power supply inputs and amplifier outputs.
Proper grounding guidelines help to improve audio performance,
minimize crosstalk between channels, and prevent switching
noise from coupling into the audio signal.
To maintain high output swing and high peak output power,
ensure that the PCB traces that connect the output pins to the
load and supply pins are as wide as possible to maintain the
minimum trace resistances. It is also recommended that a large
ground plane be used for minimum impedances. In addition,
good PCB layout isolates critical analog paths from sources of
high interference. High frequency circuits (analog and digital)
should be separated from low frequency circuits.
Properly designed multilayer PCBs can reduce EMI emission
and increase immunity to the RF field by a factor of 10 or more
compared with double-sided boards. A multilayer board allows
a complete layer to be used for the ground plane, whereas the
ground plane side of a double-sided board is often disrupted by
signal crossover.
If the system has separate ground planes for small signal and
high power connections, there should be no overlap between
these planes. Stitch the power plane to the SSM3302 exposed pad
using multiple vias. Proper layout improves heat conduction
into the board, allowing operation at larger output power levels
without overtemperature issues.
INPUT CAPACITOR SELECTION
Input capacitors are required if the input signal is not biased within
the recommended input dc common-mode voltage range, if
high-pass filtering is needed, or if a single-ended source is used.
If high-pass filtering is needed at the input, the input capacitor
and the input resistor of the SSM3302 form a high-pass filter
with a corner frequency determined by the following equation:
fC = 1/(2π × RIN × CIN)
The input capacitor can significantly affect the performance of
the circuit. Failure to use input capacitors degrades the output
offset of the amplifier.
BOOTSTRAP CAPACITORS
The output stage of the SSM3302 uses a high-side NMOS driver,
rather than PMOS driver. To generate the gate drive voltage for
the high-side NMOS driver, a bootstrap capacitor for each output
terminal acts as a floating power supply for the switching cycle.
Using 0.22 μF ceramic capacitors with a voltage rating of 35 V
or greater is recommended.
OUTPUT > 0V
+5V
0V
OUTR+/
OUTL+
+5V
0V
OUTR–/
OUTL–
+5V
0V
VOUT
OUTPUT < 0V
+5V
0V
OUTR+/
OUTL+
+5V
0V
OUTR–/
OUTL–
0V
–5V
VOUT
OUTPUT = 0V
OUTR+/
OUTL+
+5V
0V
+5V
0V
OUTR–/
OUTL–
+5V
–5V
0V
VOUT
10198-
036
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相關代理商/技術參數(shù) |
參數(shù)描述 |
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| SSM3302ACPZ-RL | 功能描述:IC AMP AUDIO 20W STER D 40LFCSP RoHS:是 類別:集成電路 (IC) >> 線性 - 音頻放大器 系列:- 產(chǎn)品培訓模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標準包裝:2,500 系列:DirectDrive® 類型:D 類 輸出類型:1-通道（單聲道），帶立體聲耳機 在某負載時最大輸出功率 x 通道數(shù)量:930mW x 1 @ 8 歐姆; 40mW x 2 @ 16 歐姆 電源電壓:2.7 V ~ 5.5 V 特點:消除爆音，差分輸入，I²C，靜音，關閉，音量控制 安裝類型:表面貼裝 供應商設備封裝:25-WLP（2.09x2.09） 封裝/外殼:25-WFBGA，WLCSP 包裝:帶卷 (TR) 其它名稱:MAX97000EWA+T-ND |
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