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| 型号： | ICS873996AYLF |
| 厂商： | IDT, Integrated Device Technology Inc |
| 文件页数： | 8/10页 |
| 文件大小： | 0K |
| 描述： | IC ZD/MULT/DIVIDER 48-LQFP |
| 标准包装： | 250 |
| 系列： | HiPerClockS™ |
| 类型： | 零延迟，倍增器，除法器 |
| PLL： | 带旁路 |
| 输入： | HCSL，LVDS，LVHSTL，LVPECL，SSTL |
| 输出： | LVPECL |
| 电路数： | 1 |
| 比率 - 输入:输出： | 2:6 |
| 差分 - 输入:输出： | 是/是 |
| 频率 - 最大： | 640MHz |
| 除法器/乘法器： | 是/是 |
| 电源电压： | 3.135 V ~ 3.465 V |
| 工作温度： | 0°C ~ 70°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 48-TQFP 裸露焊盘 |
| 供应商设备封装： | 48-PTQFP-EP（7x7） |
| 包装： | 托盘 |
| 其它名称： | 800-2287 873996AYLF ICS873996AYLF-ND |
Micrel, Inc.
SY88149CL
January 2009
7
M9999-011609-C
hbwhelp@micrel.com or (408) 955-1690
Functional Block Diagram
Detailed Description
The SY88149CL high-sensitivity limiting post amplifier
operates from a single +3.3V power supply, over
temperatures from –40°C to +85°C. Signals with data
rates up to 1.25Gbps and as small as 5mVPP can be
amplified. Figure 1 shows the allowed input voltage
swing. The SY88149CL generates an SD output,
allowing feedback to EN for output stability. SDLVL sets
the sensitivity of the input amplitude detection.
Input Amplifier/Buffer
Figure 2 shows a simplified schematic of the input
stage. The high-sensitivity of the input amplifier allows
signals as small as 5mVPP to be detected and amplified.
The input amplifier allows input signals as large as
1800mVPP. Input signals are linearly amplified with a
typically 42dB differential voltage gain. Since it is a
limiting amplifier, the SY88149CL outputs typically
1500mVPP voltage-limited waveforms for input signals
that are greater than 12mVPP. Applications requiring the
SY88149CL to operate with high-gain should have the
upstream TIA placed as close as possible to the
SY88149CL’s input pins. This ensures the best
performance of the device.
Output Buffer
The SY88149CL’s PECL 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.
Signal Detect
The SY88149CL generates a chatter-free Signal-Detect
(SD) open-collector TTL output with internal 4.75k pull-
up resistor, as shown in Figure 4. SD is used to
determine that the input amplitude is too small to be
considered a valid input. SD asserts high if the input
amplitude rises above threshold set by SDLVL and de-
asserts low otherwise. SD can be fed back to the enable
(EN) input to maintain output stability under a SDs of
signal condition. EN de-asserts low the true output
signal without removing the input signals. Typically,
3.4dB SD hysteresis is provided to prevent chattering.
Signal Detect Level Set
A programmable SD level set pin (SDLVL) sets the
threshold of the input amplitude detection. Connecting
an external resistor between VCC and SDLVL sets the
voltage at SDLVL. 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 SY88149CL provides typically 3.4dB SD 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 hence the ratios change linearly. Therefore,
the optical hysteresis in dB is half the electrical
hysteresis in dB given in the data sheet. The
SY88149CL is an electrical device; this data sheet
refers to hysteresis in electrical terms. With 3.4dB SD
hysteresis, a voltage factor of 1.5 is required to assert or
de-assert SD.
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