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| 型号： | SSM2019BRNZ |
| 厂商： | Analog Devices Inc |
| 文件页数： | 8/10页 |
| 文件大小： | 0K |
| 描述： | IC PREAMP AUDIO MONO AB 8SOIC |
| 标准包装： | 98 |
| 类型： | AB 类 |
| 输出类型： | 1-通道（单声道） |
| 电源电压： | 10 V ~ 36 V，±5 V ~ 18 V |
| 特点： | 差分输入 |
| 安装类型： | 表面贴装 |
| 供应商设备封装： | 8-SOIC |
| 封装/外壳： | 8-SOIC（0.154"，3.90mm 宽） |
| 包装： | 管件 |
REV.
SSM2019
–7–
RG
C4
200pF
Z1
Z2
Z3
Z4
R1
10k
R2
10k
R3
6.8k
1%
R4
6.8k
1%
+IN
–IN
R5
100
C3
47 F
C1
C2
VOUT
+18V
–18V
C1, C2: 22 F TO 47 F, 63V, TANTALUM OR ELECTROLYTIC
Z1–Z4: 12V, 1/2W
RG1
RG2
SSM2019
+48V
Figure 4. SSM2019 in Phantom Powered Microphone Circuit
INPUTS
The SSM2019 has protection diodes across the base emitter
junctions of the input transistors. These prevent accidental
avalanche breakdown, which could seriously degrade noise
performance. Additional clamp diodes are also provided to prevent
the inputs from being forced too far beyond the supplies.
(INVERTING)
(NONINVERTING)
TRANSDUCER
SSM2019
a. Single-Ended
R
TRANSDUCER
SSM2019
R
b. Pseudo-Differential
TRANSDUCER
SSM2019
c. True Differential
Figure 3. Three Ways of Interfacing Transducers for
High Noise Immunity
Although the SSM2019 inputs are fully floating, care must be
exercised to ensure that both inputs have a dc bias connection
capable of maintaining them within the input common-mode
range. The usual method of achieving this is to ground one side
of the transducer as in Figure 3a. An alternative way is to float
the transducer and use two resistors to set the bias point as in
Figure 3b. The value of these resistors can be up to 10 k
W, but
they should be kept as small as possible to limit common-mode
pickup. Noise contribution by resistors is negligible since it is
attenuated by the transducer’s impedance. Balanced transducers
give the best noise immunity and interface directly as in Figure 3c.
For stability, it is required to put an RF bypass capacitor directly
across the inputs, as shown in Figures 3 and 4. This capacitor
should be placed as close as possible to the input terminals. Good
RF practice should also be followed in layout and power supply
bypassing, since the SSM2019 uses very high bandwidth devices.
REFERENCE TERMINAL
The output signal is specified with respect to the reference terminal,
which is normally connected to analog ground. The reference
may also be used for offset correction or level shifting. A refer-
ence source resistance will reduce the common-mode rejection
by the ratio of 5 k
W/RREF. If the reference source resistance is
1
W, then the CMR will be reduced to 74 dB (5 kW/1 W = 74 dB).
COMMON-MODE REJECTION
Ideally, a microphone preamplifier responds to only the difference
between the two input signals and rejects common-mode voltages
and noise. In practice, there is a small change in output voltage
when both inputs experience the same common-mode voltage
change; the ratio of these voltages is called the common-mode
gain. Common-mode rejection (CMR) is the logarithm of the ratio
of differential-mode gain to common-mode gain, expressed in dB.
PHANTOM POWERING
A typical phantom microphone powering circuit is shown in
Figure 4. Z1 to Z4 provide transient overvoltage protection for
the SSM2019 whenever microphones are plugged in or unplugged.
A
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相关代理商/技术参数 |
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|---|---|
| SSM2019BRNZ | 制造商:Analog Devices 功能描述:IC AUDIO POWER AMP CLASS AB SOIC-8 |
| SSM2019BRNZRL | 功能描述:IC PREAMP AUDIO MONO AB 8SOIC RoHS:是 类别:集成电路 (IC) >> 线性 - 音頻放大器 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:2,500 系列:DirectDrive® 类型:D 类 输出类型:1-通道（单声道），带立体声耳机 在某负载时最大输出功率 x 通道数量:930mW x 1 @ 8 欧姆; 40mW x 2 @ 16 欧姆 电源电压:2.7 V ~ 5.5 V 特点:消除爆音，差分输入，I²C，静音，关闭，音量控制 安装类型:表面贴装 供应商设备封装:25-WLP（2.09x2.09） 封装/外壳:25-WFBGA，WLCSP 包装:带卷 (TR) 其它名称:MAX97000EWA+T-ND |
| SSM2019BRW | 制造商:Analog Devices 功能描述:Audio Amp Microphone 1-CH Mono Class-AB 16-Pin SOIC W 制造商:Rochester Electronics LLC 功能描述:SELF CONTAINED AUDIO PRE-AMPLIFIER - Bulk 制造商:Analog Devices 功能描述:IC PRE-AMP AUDIO |
| SSM2019BRWRL | 制造商:Analog Devices 功能描述:Audio Amp Microphone 1-CH Mono Class-AB 16-Pin SOIC W T/R |
| SSM2019BRWZ | 功能描述:IC PREAMP AUDIO MONO AB 16SOIC RoHS:是 类别:集成电路 (IC) >> 线性 - 音頻放大器 系列:- 标准包装:80 系列:- 类型:AB 类 输出类型:1-通道（单声道） 在某负载时最大输出功率 x 通道数量:1.25W x 1 @ 8 欧姆 电源电压:2.5 V ~ 5.5 V 特点:消除爆音，差分输入，关闭，热保护 安装类型:表面贴装 供应商设备封装:8-MSOP-PowerPad 封装/外壳:8-TSSOP，8-MSOP（0.118"，3.00mm 宽）裸露焊盘 包装:管件 配用:296-31419-ND - EVAL MODULE FOR TPA6205A1 其它名称:296-34563-5TPA6205A1DGN-ND |
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