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参数资料
| 型号： | SSM2275RM |
| 厂商： | ANALOG DEVICES INC |
| 元件分类： | 音频／视频放大 |
| 英文描述： | Single Audio Amplifier |
| 中文描述： | 1 CHANNEL, AUDIO AMPLIFIER, PDSO8 |
| 封装： | MICRO, SOIC-8 |
| 文件页数： | 14/16页 |
| 文件大小： | 192K |
| 代理商： | SSM2275RM |
SSM2275/SSM2475
REV. A
–14–
SPICE Macro-model
The SPICE macro-model for the SSM2275 is shown in Listing
1 on the following page. This model is based on typical values
for the device and can be downloaded from Analog Devices’
Internet site at
www.analog.com
. The model uses a common
emitter output stage to provide rail-to-rail performance. A resis-
tor and dc voltage source, in series with the collector, accurately
portray output dropout voltage versus output current. The
VCMH and VCML sources set the upper and lower limits of
the input common mode voltage range. Both are set up as a
function of the supply voltage to mimic the varying common
mode range with supply voltage. The EOS voltage source estab-
lishes the offset voltage and is also used to create the common-
mode rejection and power supply rejection characteristics for
the model.
A secondary pole section is also set up to vary the gain band-
width product and phase margin of the model based on the
supply voltage. The H1 and VR1 sources set up an equivalent
resistor that is linearly varied with supply voltage. This equiva-
lent resistance, in parallel with C2, creates the secondary pole.
G2 is also linearly varied to increase the GBW at higher supply
voltages. With a supply voltage of 5 V, the gain bandwidth
product is 6.3 MHz with a 47 degree phase margin. At a 30 V
supply voltage, the GBW product moves out to 7.5 MHz with
48
°
phase margin.
The broadband input referred voltage noise for the model is
6.8 nV/
√
Hz
. Flicker noise characteristics are also accurately
modeled with the 1/f corner frequency set through the KF and
AF terms in the input stage transistors. Finally, a voltage-con-
trolled current source, GSY, is used to model the amplifier’s
supply current versus supply voltage characteristics.
6
7
5
100pF
330pF
16
15
14
13
12
11
10
9
18-BIT
DAC
18-BIT
SERIAL
REG.
VOL
AGND
18-BIT
SERIAL
REG.
18-BIT
DAC
VOR
VBL
DGND
VBR
LR
DR
LL
DL
CK
V
L
1
2
3
4
5
6
7
8
AD1868
220
m
F
47k
V
RIGHT
CHANNEL
OUTPUT
330pF
100pF
220
m
F
LEFT
CHANNEL
OUTPUT
+5V SUPPLY
1
3
2
4
8
1/2
SSM2275
1/2
SSM2275
47k
7.68k
V
7.68k
V
7.68k
V
7.68k
V
9.76k
V
9.76k
V
V
REF
V
REF
V
S
Figure 42. A Smoothing Filter for an 18-Bit Stereo DAC
相关PDF资料 |
PDF描述 |
|---|---|
| SSM2275S | Single Audio Amplifier |
| SSM2475RU | Single Audio Amplifier |
| SSM2475S | Single Audio Amplifier |
| SSM2125 | Dolby Pro-Logic Surround Matrix Decoder |
| SSM2126 | Dolby Pro-Logic Surround Matrix Decoder |
相关代理商/技术参数 |
参数描述 |
|---|---|
| SSM2275S | 制造商:Analog Devices 功能描述:Operational Amplifier, Dual AMP, Bipolar/MOS, 8 Pin, Plastic, SOP |
| SSM22LLPT | 制造商:未知厂家 制造商全称:未知厂家 功能描述:SCHOTTKY BARRIER RECTIFIER VOLTAGE RANGE 20 Volts CURRENT 2.0 Amperes |
| SSM22LPT | 制造商:未知厂家 制造商全称:未知厂家 功能描述:SURFACE MOUNT SCHOTTKY BARRIER RECTIFIER VOLTAGE RANGE 20 - 40 Volts CURRENT 2.0 Amperes |
| SSM22PT | 制造商:CHENMKO 制造商全称:Chenmko Enterprise Co. Ltd. 功能描述:SCHOTTKY BARRIER RECTIFIER |
| SSM2301 | 制造商:AD 制造商全称:Analog Devices 功能描述:Filterless High Efficiency Mono 1.4W Class-D Audio Amplifier |
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