Datasheet > SSM2165-2S-REEL7

SSM2165-2S-REEL7

更新时间： 2024-02-19 16:06:44

品牌	Logo	应用领域
亚德诺 - ADI		放大器光电二极管商用集成电路
页数	文件大小	规格书
10页	162K
描述
1 CHANNEL, AUDIO PREAMPLIFIER, PDSO8, SOIC-8

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SSM2165-2S-REEL7 技术参数

是否Rohs认证：	不符合	生命周期：	Obsolete
零件包装代码：	SOIC	包装说明：	SOIC-8
针数：	8	Reach Compliance Code：	not_compliant
ECCN代码：	EAR99	HTS代码：	8542.33.00.01
风险等级：	5.87	标称带宽：	20 kHz
商用集成电路类型：	AUDIO PREAMPLIFIER	增益：	8 dB
谐波失真：	0.5%	JESD-30 代码：	R-PDSO-G8
JESD-609代码：	e0	长度：	4.9 mm
湿度敏感等级：	1	信道数量：	1
功能数量：	1	端子数量：	8
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：	SOP8,.25	封装形状：	RECTANGULAR
封装形式：	SMALL OUTLINE	峰值回流温度（摄氏度）：	240
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：	Tin/Lead (Sn85Pb15)	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

SSM2165-2S-REEL7 数据手册

SSM2165

10␮F

+5V

BUF

VCA

OUT

V+

0.1␮F

GENERATOR

AND AC

VOLTMETER

AC VOLTMETER

AND OSCILLOSCOPE

VCA

BUFFER

LEVEL

DETECTOR

CONTROL

+2V

HEADPHONES

SSM2165-1

2k⍀

AVG CAP

1:1

R1 – COMPRESSION

15:1 RATIO SET

MICROPHONE

(ELECTRET)

22␮F

200k⍀

GND

Figure 16. Electret Microphone Preamp Example

STEP 1. Initialize Potentiometer

With power off, preset R1—Compression Ratio potentiometer

to zero ohms.

Compression Adjustment—A Practical Example

To illustrate how to set the compression ratio of the SSM2165,

we will take a practical example. The SSM2165 will be used

interface an electret-type microphone to a post-amplifier, as

shown in Figure 16. The signal from the microphone was mea-

sured under actual conditions to vary from 2 mV to 30 mV.

The post-amplifier requires no more than 350 mV at its input.

We will therefore choose the SSM2165-1, whose “rotation”

point is 40 mV and whose VCA fixed gain is 18 dB (×8), thus

giving 320 mV at limiting. From prior listening experience, we

will use a 2:1 compression ratio. The noise gate threshold of the

SSM2165-1 will operate when the input signal falls below 500 µV.

These objectives are summarized in Table II. The transfer charac-

teristic we will implement is illustrated in Figure 18.

STEP 2. Check Setup

With power on, adjust the generator for an input level of

50 mV (–24 dBu), 1 kHz. The output meter should indicate

approximately 350 mV (–6.9 dBu). If not, check your setup.

STEP 3. Find the Rotation Point

Set the input level to 50 mV (–24 dBu), and observe the output

on the oscilloscope. The output will be in the limiting range of

operation. Slowly reduce the input signal level until the output

level just begins to stop limiting and follows the input down.

Increase the input so that the output is 320 mV (–7.7 dBu). You

have located the knee of the rotation point.

Table II. Objective Specification of Example

STEP 4. Adjust the Compression Ratio

With the input set as in Step 3, note the exact value of the input

signal level just below the knee (around 40 mV (–26 dBu)).

Next, reduce the input to 1/4 the value noted, (around 10 mV

(–38 dBu)), for a change of –12 dB. Next, increase the R_COMP

potentiometer resistance so the output is 160 mV (–13.7 dBu)

for an output change of –6 dB. You have now set the compres-

sion, which is the ratio of input change to output change, in dB,

to 2:1.

Input Range

Output Range

Limiting Level

Compression

Gain

2 mV–30 mV

To 350 mV

320 mV

2:1

18 dB

500 µV

Noise Gate

Test Equipment Setup

STEP 5. Confirm the Noise Gate Threshold

The recommended equipment and configuration is shown in

Figure 17. A low noise audio generator with a smooth output

adjustment range of 100 µV to 25 mV is a suitable signal

source. The output voltmeter should go up to 2 volts. The

oscilloscope is used to verify that the output is sinusoidal, that

no clipping is occurring in the buffer, and to observe the limit-

ing and noise gating “knees.”

Set the input to 1 mV, and observe the output on the oscillo-

scope. A 20 dB pad between generator and input may facilitate

this measurement. Reduce the input gradually until the output

falls off more rapidly. This point is the noise gate threshold, and

should be approximately 500 µV (–64 dBu). The noise gate

threshold on the SSM2165 is fixed at 500 µV, a practical value

for many microphones. Should you require a different noise gate

threshold, consider using the SSM2166.

Breadboard Considerations

When building your breadboard, keep the leads to Pins 2 and 3

as short as possible. Use a central analog ground and decouple

power supply connections adequately.

STEP 6. Listen

At this time, you may replace the signal generator with a

properly powered electret microphone and listen to the results

through a set of headphones. The microphone’s internal FET

usually requires around +2 V through a 2 kΩ resistor; this varies

with the manufacturer. Experiment with the compression ratio

value and averaging capacitor size. More compression will keep

the output steady over a wider range of microphone-to-source

distance. Varying the averaging capacitor, C_AVG, changes the

SIGNAL

GENERATOR

SSM2165-1

VOLTMETER

OSCILLOSCOPE

VOLTMETER

Figure 17. Test Equipment Setup

–8–

REV. A

1...5 6 789 10

中文翻译

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SSM2165-2S-REEL7 替代型号

型号	品牌	替代类型	描述	数据表
SSM2165-1SZ-REEL7	ADI	完全替代	1 CHANNEL, AUDIO PREAMPLIFIER, PDSO8, SOIC-8
SSM2165-2SZ	ADI	完全替代	1 CHANNEL, AUDIO PREAMPLIFIER, PDSO8, SOIC-8
SSM2165-2S	ADI	完全替代	Microphone Preamplifier with Variable Compression and Noise Gating

与SSM2165-2S-REEL7相关器件

型号	品牌	获取价格	描述	数据表
SSM2165-2SZ	ADI	获取价格	1 CHANNEL, AUDIO PREAMPLIFIER, PDSO8, SOIC-8
SSM2166	ADI	获取价格	Microphone Preamplifier with Variable Compression and Noise Gating
SSM2166_03	ADI	获取价格	Microphone Preamplifier with Variable Compression and Noise Gating
SSM2166_08	ADI	获取价格	Microphone Preamplifier with Variable Compression and Noise Gating
SSM2166_16	ADI	获取价格	Microphone Preamplifier
SSM2166P	ADI	获取价格	Microphone Preamplifier with Variable Compression and Noise Gating
SSM2166S	ADI	获取价格	Microphone Preamplifier with Variable Compression and Noise Gating
SSM2166S-REEL	ADI	获取价格	Microphone Preamplifier with Variable Compression and Noise Gating
SSM2166S-REEL7	ADI	获取价格	Microphone Preamplifier with Variable Compression and Noise Gating
SSM2166SZ	ADI	获取价格	Complete Microphone Conditioner with Variable Compression & Noise Gating

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