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參數(shù)資料
| 型號(hào)： | SSM2019BNZ |
| 廠商： | Analog Devices Inc |
| 文件頁(yè)數(shù)： | 8/10頁(yè) |
| 文件大?。?/td> | 0K |
| 描述： | IC PREAMP AUDIO MONO AB 8DIP |
| 標(biāo)準(zhǔn)包裝： | 50 |
| 類型： | AB 類 |
| 輸出類型： | 1-通道（單聲道） |
| 電源電壓： | 10 V ~ 36 V，±5 V ~ 18 V |
| 特點(diǎn)： | 差分輸入 |
| 安裝類型： | 通孔 |
| 供應(yīng)商設(shè)備封裝： | 8-PDIP |
| 封裝/外殼： | 8-DIP（0.300"，7.62mm） |
| 包裝： | 管件 |
| 產(chǎn)品目錄頁(yè)面： | 775 (CN2011-ZH PDF) |
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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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| SSM2019BNZ | 制造商:Analog Devices 功能描述:Audio Power Amplifier IC |
| SSM2019BRN | 制造商:Analog Devices 功能描述:Audio Amp Microphone 1-CH Mono Class-AB 8-Pin SOIC N 制造商:Analog Devices 功能描述:IC PRE-AMP AUDIO |
| SSM2019BRNRL | 制造商:Analog Devices 功能描述:Audio Amp Microphone 1-CH Mono Class-AB 8-Pin SOIC N T/R |
| SSM2019BRNZ | 功能描述:IC PREAMP AUDIO MONO AB 8SOIC RoHS:是 類別:集成電路 (IC) >> 線性 - 音頻放大器 系列:- 標(biāo)準(zhǔn)包裝:80 系列:- 類型:AB 類 輸出類型:1-通道（單聲道） 在某負(fù)載時(shí)最大輸出功率 x 通道數(shù)量:1.25W x 1 @ 8 歐姆 電源電壓:2.5 V ~ 5.5 V 特點(diǎn):消除爆音，差分輸入，關(guān)閉，熱保護(hù) 安裝類型:表面貼裝 供應(yīng)商設(shè)備封裝:8-MSOP-PowerPad 封裝/外殼:8-TSSOP，8-MSOP（0.118"，3.00mm 寬）裸露焊盤(pán) 包裝:管件 配用:296-31419-ND - EVAL MODULE FOR TPA6205A1 其它名稱:296-34563-5TPA6205A1DGN-ND |
| SSM2019BRNZ | 制造商:Analog Devices 功能描述:IC AUDIO POWER AMP CLASS AB SOIC-8 |
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