SSM2166P

更新时间： 2024-01-03 02:40:18

品牌	Logo	应用领域
亚德诺 - ADI		消费电路商用集成电路音频放大器视频放大器光电二极管
页数	文件大小	规格书
15页	218K
描述
Microphone Preamplifier with Variable Compression and Noise Gating

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技术参数
数据手册

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SSM2166P 技术参数

是否无铅：	含铅	是否Rohs认证：	符合
生命周期：	Active	零件包装代码：	SOIC
包装说明：	SOP, SOP14,.25	针数：	14
Reach Compliance Code：	compliant	ECCN代码：	EAR99
HTS代码：	8542.31.00.01	风险等级：	0.83
Is Samacsys：	N	标称带宽：	20 kHz
商用集成电路类型：	AUDIO PREAMPLIFIER	增益：	20 dB
JESD-30 代码：	R-PDSO-G14	JESD-609代码：	e3
长度：	8.65 mm	湿度敏感等级：	1
信道数量：	1	功能数量：	1
端子数量：	14	最高工作温度：	85 °C
最低工作温度：	-40 °C	封装主体材料：	PLASTIC/EPOXY
封装代码：	SOP	封装等效代码：	SOP14,.25
封装形状：	RECTANGULAR	封装形式：	SMALL OUTLINE
峰值回流温度（摄氏度）：	260	电源：	5 V
认证状态：	Not Qualified	座面最大高度：	1.75 mm
子类别：	Audio/Video Amplifiers	最大压摆率：	10 mA
最大供电电压 (Vsup)：	5.5 V	最小供电电压 (Vsup)：	4.5 V
表面贴装：	YES	技术：	BIPOLAR
温度等级：	INDUSTRIAL	端子面层：	Matte Tin (Sn)
端子形式：	GULL WING	端子节距：	1.27 mm
端子位置：	DUAL	处于峰值回流温度下的最长时间：	30
宽度：	3.9 mm	Base Number Matches：	1

SSM2166P 数据手册

SSM2166

10␮F

C7*

10␮F

V+

BUF

VCA

OUT

R1 = 10k⍀

1k⍀

INPUT

BUFFER

OUTPUT

VCA

OUT

AUDIO

+IN

GAIN

ADJUST

V+

0.1␮F

GAIN

SSM2166

R2 = 10k⍀

1␮F

GATE

NOISE

GATE

RMS

LEVEL

DETECTOR

CONTROL

CIRCUITRY

ROTATION

POINT

ROT PT

ADJUST

POWER

DOWN

POWER

DOWN

AVG

CAP

COMPRESSION

RATIO SET

GND

AVG

*OPTIONAL

COMP

2.2␮F

GND

Figure 14. Functional Block Diagram and Typical Application

small signal. The attack time, the time it takes for the gain to be

reduced when a small signal is followed by a large signal, is con-

trolled partly by the AVG CAP value, but is mainly controlled

by internal circuitry that speeds up the attack for large level

changes. This limits overload time to under 1 ms in most cases.

bandwidth is unaffected). The GBW plots are shown in Figure

10b. The lower 3 dB cutoff frequency of the SSM2166 is set by

the input impedance of the VCA (1 kΩ) and C6. While the

noise of the input buffer is fixed, the input referred noise of the

VCA is a function of gain. The VCA input noise is designed to

be a minimum when the gain is at a maximum, thereby optimiz-

ing the usable dynamic range of the part. A photograph of the

SSM2166’s wideband peak-to-peak output noise is illustrated in

Figure 10b.

The performance of the rms level detector is illustrated in Fig-

ure 15 for a C_AVGof 2.2 µF (Figure 15a) and 22 µF (Figure

15b). In each of these photographs, the input signal to the

SSM2166 (not shown) is a series of tone bursts in 6 successive

10 dB steps. The tone bursts range from –66 dBV (0.5 mV rms)

to –6 dBV (0.5 V rms). As illustrated in the photographs, the

attack time of the rms level detector is dependent only on C_AVG

but the release times are linear ramps whose decay times are

dependent on both C_AVGand the input signal step size. The

rate of release is approximately 240 dB/s for a C_AVGof 2.2 µF,

and 12 dB/s for a C_AVGof 22 µF.

The Level Detector

The SSM2166 incorporates a full-wave rectifier and a patent-

pending, true rms level detector circuit whose averaging time

constant is set by an external capacitor connected to the AVG

CAP pin (Pin 8). For optimal low frequency operation of the

level detector down to 10 Hz, the value of the capacitor should

be 2.2 µF. Some experimentation with larger values for the

AVG CAP may be necessary to reduce the effects of excessive

low frequency ambient background noise. The value of the aver-

aging capacitor affects sound quality: too small a value for this

capacitor may cause a “pumping effect” for some signals, while

too large a value can result in slow response times to signal dy-

namics. Electrolytic capacitors are recommended here for low-

est cost and should be in the range of 2 µF to 47 µF. Capacitor

values from 18 µF to 22 µF have been found to be more appro-

priate in voiceband applications, where capacitors on the low

end of the range seem more appropriate for music program

material.

100mV

100

6dBV

66dBV

85dBV

100ms

The rms detector filter time constant is approximately given by

10•C_AVGmilliseconds where C_AVGis in µF. This time constant

controls both the steady-state averaging in the rms detector as

well as the release time for compression; that is, the time it takes

for the system gain to react when a large input is followed by a

Figure 15a. RMS Level Detector Performance with

C_AVG= 2.2 µF

REV. A

–7–

1...4 5 678 9 10...15

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