参数资料
| 型号： | SY88993ALKG |
| 厂商： | Micrel Inc |
| 文件页数： | 2/8页 |
| 文件大小： | 0K |
| 描述： | IC AMP LIMITING POST 3.3V 10MSOP |
| 标准包装： | 100 |
| 类型： | 限幅后置放大器 |
| 应用： | 光纤学网络 |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 10-TFSOP，10-MSOP（0.118"，3.00mm 宽） |
| 供应商设备封装： | 10-MSOP |
| 包装： | 管件 |
| 产品目录页面： | 1090 (CN2011-ZH PDF) |
| 其它名称： | 576-3339-5 |
Micrel, Inc.
SY88993AL
September 2008
2
M9999-093008-A
hbwhelp@micrel.com or (408) 955-1690
Block Diagram
Detailed Description
The SY88993AL is a high-sensitivity limiting post
amplifier that operates from a single +3.3V power
supply, over temperatures from –40
oC to +85oC. Signals
with data rates up to 3.2Gbps and as small as 4mVPP
can be amplified. Figure 2 shows the allowed input
voltage swing. The SY88993AL generates a LOS output.
LOSLVL sets the sensitivity of the input amplitude
detection.
Input Amplifier/Buffer
Figure 3 shows a simplified schematic of the
SY88993AL’s input stage. The high-sensitivity of the
input amplifier allows signals as small as 4mVPP to be
detected and amplified. The input amplifier also allows
input signals as large as 1800mVPP. Input signals below
6mVpp are linearly amplified with a typical 38dB
differential voltage gain. Since it is a limiting amplifier,
the SY88993AL outputs typically 800mVPP voltage-
limited waveforms for input signals that are greater than
10mVPP. Applications requiring the SY88993AL to
operate with high-gain should have the upstream TIA
placed as close as possible to the SY88993AL’s input
pins to ensure the best performance of the device.
Output Buffer
The SY88993AL’s CML output buffer is designed to
drive 50 lines. The output buffer requires appropriate
termination for proper operation. An external 50
resistor to VCC for each output pin provides this. Figure 4
shows a simplified schematic of the output stage.
Loss-of-Signal
The SY88993AL generates a chatter-free LOS open-
collector TTL output which requires an external pull-up
resistor, as shown in Figure 1. LOS is used to determine
that the input amplitude is large enough to be considered
a valid input. LOS asserts high if the input amplitude falls
below the threshold sets by LOSLVL and de-asserts low
otherwise. LOS can be fed back to the enable bar (/EN)
input to maintain output stability under a loss of signal
condition. /EN de-asserts the true output signal without
removing the input signals. Typically, 5.6dB LOS
hysteresis is provided to prevent chattering.
Loss-of-Signal Level Set
The SY88993AL incorporates a programmable level
detect function to identify when the input signal has been
lost. This information can be fed back to the /EN input of
the device to maintain stability under loss of signal
conditions. Using LOSLVL pin the sensitivity of the level
detect can be adjusted. The LOSLVL voltage can be set
by connection a resistor divider between VCC and VREF,
Figure 5.
Hysteresis
The SY88993AL typically provides 5.6dB LOS electrical
hysteresis. By definition, a power ratio measured in dB is
10log (power ratio). Power is calculated as V
2
IN/R for an
electrical signal. Hence, the same ratio can be stated as
20log (voltage ratio). While in linear mode, the electrical
voltage input changes linearly with the optical power and
therefore, the ratios change linearly. Thus, the optical
hysteresis in dB is half the electrical hysteresis in dB
given in the data sheet. Since the SY88993AL is an
electrical device, this data sheet refers to hysteresis in
electrical terms. With 5.6dB LOS hysteresis, a voltage
factor of about 2 is required to assert or de-assert LOS.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| SY88993ALKG TR | 功能描述:限幅放大器 3.3V-5V 3.2 Gbps High-Speed Limiting Post Amplifier w/ High Input Sensitivity RoHS:否 制造商:Micrel 输入电压范围（最大值）:3.6 V 工作电源电压:3.3 V 电源电流:40 mA 工作温度范围:- 40 C to + 85 C 封装 / 箱体:MSOP-10 封装:Tube |
| SY88993ALKGTR | 制造商:MICREL 制造商全称:Micrel Semiconductor 功能描述:3.3V 3.2Gbps High-Speed Limiting Post Amplifier with High Input Sensitivity |
| SY88993AV | 制造商:MICREL 制造商全称:Micrel Semiconductor 功能描述:5V/3.3V 3.2Gbps HIGH-SPEED LIMITING POST AMPLIFIER |
| SY88993AV_05 | 制造商:MICREL 制造商全称:Micrel Semiconductor 功能描述:5V/3.3V 3.2Gbps HIGH-SPEED LIMITING POST AMPLIFIER |
| SY88993AV_07 | 制造商:MICREL 制造商全称:Micrel Semiconductor 功能描述:5V/3.3V 3.2Gbps HIGH-SPEED LIMITING POST AMPLIFIER SY88993AV |
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