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參數(shù)資料
| 型號： | SY88343DLMG TR |
| 廠商： | Micrel Inc |
| 文件頁數(shù)： | 8/10頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC POST AMP CML LIMITING 16-MLF |
| 標(biāo)準(zhǔn)包裝： | 1,000 |
| 放大器類型： | 限制 |
| 電路數(shù)： | 1 |
| 輸出類型： | 差分 |
| 電流 - 電源： | 45mA |
| 電流 - 輸出 / 通道： | 25mA |
| 電壓 - 電源，單路/雙路(±)： | 3 V ~ 3.6 V |
| 工作溫度： | -40°C ~ 85°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 16-VFQFN 裸露焊盤，16-MLF? |
| 供應(yīng)商設(shè)備封裝： | 16-QFN-EP（3x3） |
| 包裝： | 帶卷 (TR) |
| 其它名稱： | SY88343DLMGTR SY88343DLMGTR-ND |
Micrel, Inc.
SY88343DL
February 2007
7
M9999-021207-B
hbwhelp@micrel.com or (408) 955-1690
Functional Block Diagram
Detailed Description
The SY88343DL 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 5mVPP can be
amplified. Figure 1 shows the allowed input voltage
swing. The SY88343DL generates a LOS output.
LOSLVL sets the sensitivity of the input amplitude
detection.
Input Amplifier/Buffer
Figure
2
shows
a
simplified
schematic
of
the
SY88343DL’s input stage. The high-sensitivity of the
input amplifier allows signals as small as 5mVPP to be
detected and amplified. The input amplifier also allows
input signals as large as 1800mVPP. Input signals are
linearly amplified with a typical 38dB differential
voltage gain. Since it is a limiting amplifier, the
SY88343DL outputs typically 800mVPP voltage-limited
waveforms for input signals that are greater than
12mVPP. Applications requiring the SY88343DL to
operate with high-gain should have the upstream TIA
placed as close as possible to the SY88343DL’s input
pins to ensure the best performance of the device.
Output Buffer
The SY88343DL’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 SY88343DL 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 set 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
SY88343DL
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 SY88343DL 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 |
|---|---|
| SY88343HL | 制造商:MICREL 制造商全稱:Micrel Semiconductor 功能描述:3.3V, 3.2Gbps CML Limiting Post Amplifier with High-Gain TTL Loss-of-Signal |
| SY88343HLMG | 功能描述:限幅放大器 3.3V 155-3200 Mbps High Sensitivity CML Post Amp: 4xLOSgain/20xTC/16 MLF no 50 Ohm (I Temp, Green) 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 |
| SY88343HLMG TR | 功能描述:限幅放大器 3.3V 155-3200 Mbps High Sensitivity CML Post Amp: 4xLOSgain/20xTC/16 MLF no 50 Ohm (I Temp, Green) 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 |
| SY88343HLMGTR | 制造商:MICREL 制造商全稱:Micrel Semiconductor 功能描述:3.3V, 3.2Gbps CML Limiting Post Amplifier with High-Gain TTL Loss-of-Signal |
| SY88345BL | 制造商:MICREL 制造商全稱:Micrel Semiconductor 功能描述:3.3V, 3.2Gbps CML Low-Power Limiting Post Amplifier w/ High-Gain TTL Signal Detect |
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