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參數(shù)資料
| 型號(hào)： | SY88289HLMG |
| 廠商： | Micrel Inc |
| 文件頁(yè)數(shù)： | 6/9頁(yè) |
| 文件大?。?/td> | 0K |
| 描述： | IC CML LIMITING AMP 16MLF |
| 標(biāo)準(zhǔn)包裝： | 100 |
| 類(lèi)型： | 限幅后置放大器 |
| 應(yīng)用： | 光纖學(xué)網(wǎng)絡(luò) |
| 安裝類(lèi)型： | 表面貼裝 |
| 封裝/外殼： | 16-VFQFN 裸露焊盤(pán)，16-MLF? |
| 供應(yīng)商設(shè)備封裝： | 16-MLF?（3x3） |
| 包裝： | 管件 |
| 產(chǎn)品目錄頁(yè)面： | 1089 (CN2011-ZH PDF) |
| 其它名稱(chēng)： | 576-2114-5 576-2114-5-ND 576-2966-5 |
Micrel, Inc.
SY88289HL
August 2007
6
M9999-082007-A
hbwhelp@micrel.com or (408) 955-1690
Functional Block Diagram
Detailed Description
The SY88289HL high-sensitivity limiting post amplifier
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 1 shows the allowed input voltage
swing. The SY88289HL generates a LOS output.
LOSLVL sets the sensitivity of the input amplitude
detection.
Input Amplifier/Buffer
Figure
2
shows
a
simplified
schematic
of
the
SY88289HL’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
46dB differential voltage gain. Since it is a limiting
amplifier, the SY88289HL outputs typically 800mVPP
voltage-limited waveforms for input signals that are
greater
than
6mVPP.
Applications
requiring
the
SY88289HL to operate with high-gain should have the
upstream TIA placed as close as possible to the
SY88289HL’s
input
pins
to
ensure
the
best
performance of the device.
Output Buffer
The SY88289HL’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
3 shows a simplified schematic of the output stage.
Loss-of-Signal
The SY88289HL generates a chatter-free LOS open-
collector TTL output with an internal 4.75k
pull
-up
resistor, as shown in Figure 4. 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, 3.5dB LOS hysteresis is
provided to prevent chattering.
Loss-of-Signal Level Set
A programmable LOS level-set pin (LOSLVL) sets the
threshold of the input amplitude detection. Connecting
an external resistor between VCC and LOSLVL sets the
voltage at LOSLVL. This voltage ranges from VCC to
VREF. The external resistor creates a voltage divider
between VCC and VREF, as shown in Figure 5.
Hysteresis
The
SY88289HL
typically
provides
3.5dB
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 SY88289HL is an electrical
device, this data sheet refers to hysteresis in electrical
terms. With 3.5dB LOS hysteresis, a voltage factor of
1.5 is required to assert or de-assert LOS.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| SY88289HLMG TR | 功能描述:限幅放大器 3.3V 155-3200 Mbps CML Post Amp: OCP Pinout/I Temp, Green/4xLOSgain/20xTC/16 MLF RoHS:否 制造商:Micrel 輸入電壓范圍（最大值）:3.6 V 工作電源電壓:3.3 V 電源電流:40 mA 工作溫度范圍:- 40 C to + 85 C 封裝 / 箱體:MSOP-10 封裝:Tube |
| SY88289HLMGTR | 制造商:MICREL 制造商全稱(chēng):Micrel Semiconductor 功能描述:3.3V, 3.2Gbps High-Gain CML Limiting Amplifier with High-sensitivity Loss-of-Signal Detection |
| SY88303BL | 制造商:MICREL 制造商全稱(chēng):Micrel Semiconductor 功能描述:3.3V, 3.2Gbps CML Limiting Post Amplifier with Wide Loss-of-Signal Detection Range |
| SY88303BLEY | 功能描述:限幅放大器 3.3V 155-3200 Mbps CML Post Amp: 0.5xLOSgain/20xTC/10 MSOP (I Temp, Lead Free) RoHS:否 制造商:Micrel 輸入電壓范圍（最大值）:3.6 V 工作電源電壓:3.3 V 電源電流:40 mA 工作溫度范圍:- 40 C to + 85 C 封裝 / 箱體:MSOP-10 封裝:Tube |
| SY88303BLEY TR | 功能描述:限幅放大器 3.3V 155-3200 Mbps CML Post Amp: 0.5xLOSgain/20xTC/10 MSOP (I Temp, Lead Free) RoHS:否 制造商:Micrel 輸入電壓范圍（最大值）:3.6 V 工作電源電壓:3.3 V 電源電流:40 mA 工作溫度范圍:- 40 C to + 85 C 封裝 / 箱體:MSOP-10 封裝:Tube |
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