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參數(shù)資料
| 型號： | SY89835UMG TR |
| 廠商： | Micrel Inc |
| 文件頁數(shù)： | 8/10頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC CLOCK BUFFER 1:2 3GHZ 8-MLF |
| 標(biāo)準(zhǔn)包裝： | 1 |
| 系列： | Precision Edge® |
| 類型： | 扇出緩沖器（分配） |
| 電路數(shù)： | 1 |
| 比率 - 輸入:輸出： | 1:2 |
| 差分 - 輸入:輸出： | 是/是 |
| 輸入： | LVDS |
| 輸出： | LVDS |
| 頻率 - 最大： | 3GHz |
| 電源電壓： | 2.375 V ~ 2.635 V |
| 工作溫度： | -40°C ~ 85°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 8-VFDFN 裸露焊盤，8-MLF? |
| 供應(yīng)商設(shè)備封裝： | 8-MLF?（2x2） |
| 包裝： | 標(biāo)準(zhǔn)包裝 |
| 產(chǎn)品目錄頁面： | 1084 (CN2011-ZH PDF) |
| 其它名稱： | 576-1506-6 |
Micrel, Inc.
SY88149HL
June 2010
7
M9999-061110-I
hbwhelp@micrel.com or (408) 955-1690
Functional Block Diagram
Detailed Description
The SY88149HL is a high-sensitivity limiting post amplifier
which operates on a +3.3V power supply over the
industrial temperature range. Signals with data rates up to
1.25Gbps and as small as 4mVpp can be amplified. Figure
1 shows the allowed input voltage swing. Depending upon
the LOS/SDSEL option, the SY88149HL can generate an
SD or LOS output, and allow feedback to the JAM input for
output stability. LOS/SDLVL sets the sensitivity of the input
amplitude detection.
To satisfy the stringent timing requirements of the GPON
specifications, the signal detect circuit offers 5ns SD
assert (LOS de-assert) time and the option to de-assert
SD (assert LOS) using the /AUTORESET or manual
RESET function. When /AUTORESET is enabled, SD
de-asserts/LOS asserts automatically within 100ns after
the last high-to-low transition of the input burst. When
the /AUTORESET function is disabled, the SD De-
assert/LOS Assert time can be reset by using the
provided RESET pin.
Input Buffer
Figure 2 shows a simplified schematic of the input stage.
The high sensitivity of the input amplifier allows signals as
small as 4mVpp to be detected and amplified. The input
buffer can allow input signals as large as 1800mVPP. Input
signals are linearly amplified with a typically 48dB
differential voltage gain until the outputs reach 1500mVPP
(typ). Applications requiring the SY88149HL to operate
with high-gain should have the upstream TIA placed as
close as possible to the SY88149HL’s input pins. This
ensures the best performance of the device.
Output Buffer
The SY88149HL’s LVPECL output buffer is designed to
drive 50
lines. The output buffer requires appropriate
termination for proper operation. An external 50
resistor to VCC–2V for each output pin provides this.
Figure 3 shows a simplified schematic of the output
stage.
Loss of Signal/Signal Detect
The SY88149HL generates a chatter-free Signal-Detect
(SD) or LOS LVTTL output, as shown in Figure 4. A highly
sensitive signal detect circuit is used to determine that the
input amplitude is too small to be considered a valid input.
LOS asserts high if the input amplitude falls below the
threshold
set
by
LOS/SDLVL
and
de-asserts
low
otherwise. SD asserts high if the input amplitude rises
above the threshold set by LOS/SDLVL and de-asserts
low otherwise. LOS/SD can be fed back to the JAM input
to maintain output stability under the absence of an invalid
signal condition. Typically, a 3 dB hysteresis is provided to
prevent chattering.
LOS/SD Level Set
A programmable LOS/SD level set pin (LOS/SDLVL) sets
the threshold of the input amplitude detection. Connecting
an external resistor between VCC and LOS/SDLVL sets the
voltage at LOS/SDLVL. This voltage ranges from VCC to
VREF. The external resistor creates a voltage divider
between VCC and VREF, as shown in Figure 5. Set the
LOS/SDLVL voltage closer to VREF or more sensitive
LOS/SD detection or closer to VCC for higher amplitude
inputs.
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| SY89837U | 制造商:MICREL 制造商全稱:Micrel Semiconductor 功能描述:PRECISION 1:8 LVPECL FANOUT BUFFER WITH 2:1 RUNT PULSE ELIMINATOR INPUT MUX |
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| SY89837UMG | 功能描述:編碼器、解碼器、復(fù)用器和解復(fù)用器 Ultra-low jitter 1:8 LVPECL fanout w/ 2:1 RPE MUX (I Temp, Green) RoHS:否 制造商:Micrel 產(chǎn)品:Multiplexers 邏輯系列:CMOS 位數(shù): 線路數(shù)量（輸入/輸出）:2 / 12 傳播延遲時間:350 ps, 400 ps 電源電壓-最大:2.625 V, 3.6 V 電源電壓-最小:2.375 V, 3 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-44 封裝:Tray |
| SY89837UMG TR | 功能描述:編碼器、解碼器、復(fù)用器和解復(fù)用器 Ultra-low jitter 1:8 LVPECL fanout w/ 2:1 RPE MUX (I Temp, Green) RoHS:否 制造商:Micrel 產(chǎn)品:Multiplexers 邏輯系列:CMOS 位數(shù): 線路數(shù)量（輸入/輸出）:2 / 12 傳播延遲時間:350 ps, 400 ps 電源電壓-最大:2.625 V, 3.6 V 電源電壓-最小:2.375 V, 3 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-44 封裝:Tray |
| SY89837UMGTR | 制造商:Micrel Inc 功能描述:Clock Driver 2-IN LVPECL 32-Pin MLF T/R 制造商:Micrel 功能描述:Clock Driver 2-IN LVPECL 32-Pin MLF T/R |
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