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參數(shù)資料
| 型號(hào)： | MAX3945ETE+ |
| 廠商： | Maxim Integrated Products |
| 文件頁數(shù)： | 3/24頁 |
| 文件大小： | 0K |
| 描述： | IC AMP LIMITING 3.3V LP 16TQFN |
| 產(chǎn)品培訓(xùn)模塊： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 標(biāo)準(zhǔn)包裝： | 100 |
| 類型： | 限幅放大器 |
| 應(yīng)用： | 光纖學(xué)網(wǎng)絡(luò) |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 16-WFQFN 裸露焊盤 |
| 供應(yīng)商設(shè)備封裝： | 16-TQFN-EP（3x3） |
| 包裝： | 管件 |
______________________________________________________________________________________ 11
MAX3945
1.0625Gbps to 11.3Gbps,
SFP+ Dual-Path Limiting Amplifier
Detailed Description
The MAX3945 is designed to operate from 1.0625Gbps
to 11.3Gbps. It consists of a dual-path limiter, offset-
correction circuitry, CML output stage, and LOS circuitry.
The characteristics of the MAX3945 can be controlled
through the on-chip 3-wire interface. The registers that
control the part’s functionality are RXCTRL1, RXCTRL2,
RXSTAT, SET_CML, SET_LOS, MODECTRL, and SET_
LOSTIMER. The MAX3945 provides integrated DACs to
allow the use of low-cost controller ICs. Figure 1 shows
simplified input and output structures.
Dual-Path Limiter
The limiting amplifier features a low data-rate path
(1.0625Gbps to 4.25Gbps) and a high data-rate path
(up to 11.3Gbps), allowing for overall system optimiza-
tion. Figure 2 shows the functional diagram. Data path
selection is controlled by the RATE_SEL bit. The low
data-rate path further features a programmable filter
that provides optimization for 1.0625Gbps, 1.25Gbps,
2.125Gbps, and 4.25Gbps operation. It is important to
tailor the bandwidth of the first stages to get the best
receive sensitivity and to reduce the maximum receive
bandwidth for a given data rate. Table 1 summarizes
the RATE_SEL, BW1, and BW0 control bit functions. The
high data-rate mode (RATE_SEL = 1) is recommended
for operation up to 11.3Gbps.
The polarity of ROUT+/ROUT- relative to RIN+/RIN- is
programmed by the RX_POL bit, as shown in Table 2.
Offset-Correction Circuitry
The offset-correction circuitry is provided to remove
PWD caused by intrinsic offset voltages within the dif-
ferential amplifier stages. An external 0.1FF capacitor
connected between the CAZ pin and ground sets the
offset-correction loop cutoff frequency to approximately
2kHz when RATE_SEL = 0 and to approximately 0.7kHz
when RATE_SEL = 1. The offset-correction loop can be
disabled using the AZ_EN bit, as shown in Table 3.
CML Output Stage
CML Output Enable and Squelch
The CML output stage is optimized for differential 100I
loads. The output stage is controlled by a combination of
the RX_EN and SQ_EN bits and the internal LOS status.
See Table 4.
Table 1. Rate Select and Bandwidth Control
Table 4. CML Output Stage Operation Modes
Table 2. Signal Polarity Control
Table 3. Offset-Correction Enable/Disable
Control
RXCTRL1[3:1]
OPERATION MODE DESCRIPTION
BW1
BW0
RATE_SEL
DATA RATE
(Gbps)
FILTER BANDWIDTH
(MHz)
RISE/FALL TIME
(ps)
0
1.0625 to 1.25
1000
52
0
1
0
2.125
2100
52
1
0
2.125
2500
52
1
0
4.25
3000
52
X
1
11.3
9000
26
RX_POL
OPERATION MODE DESCRIPTION
0
Inversed polarity of the differential signal path
1
Normal polarity of the differential signal path
AZ_EN
OPERATION MODE DESCRIPTION
0
Autozero loop is disabled
1
Autozero loop is enabled
RX_EN
SQ_EN
LOS STATUS
OPERATION MODE DESCRIPTION
0
X
CML output disabled
1
0
X
CML output enabled
1
0
CML output enabled
1
CML output disabled
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX3945ETE+ | 功能描述:限幅放大器 1.0625-11.3Gbps SFP Dual-Path Limit Amp 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 |
| MAX3945ETE+T | 功能描述:限幅放大器 1.0625-11.3Gbps SFP Dual-Path Limit Amp 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 |
| MAX3945EVKIT | 功能描述:放大器 IC 開發(fā)工具 RoHS:否 制造商:International Rectifier 產(chǎn)品:Demonstration Boards 類型:Power Amplifiers 工具用于評(píng)估:IR4302 工作電源電壓:13 V to 23 V |
| MAX3945EVKIT+ | 功能描述:限幅放大器 Evaluation Kit for the MAX3945 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 |
| MAX3946ETG+ | 功能描述:激光驅(qū)動(dòng)器 1.0625-11.3Gbps SFP Dual-Path Limit Amp RoHS:否 制造商:Micrel 數(shù)據(jù)速率:4.25 Gbps 工作電源電壓:3 V to 3.6 V 電源電流:80 mA 最大工作溫度:+ 85 C 封裝 / 箱體:QFN-16 封裝:Tube |
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