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參數(shù)資料
| 型號(hào)： | MAX3761EEP+ |
| 廠商： | Maxim Integrated Products |
| 文件頁(yè)數(shù)： | 9/12頁(yè) |
| 文件大?。?/td> | 0K |
| 描述： | IC AMP LIMITING 622MBPS 20-QSOP |
| 產(chǎn)品培訓(xùn)模塊： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 標(biāo)準(zhǔn)包裝： | 50 |
| 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： | 20-SSOP（0.154"，3.90mm 寬） |
| 供應(yīng)商設(shè)備封裝： | 20-QSOP |
| 包裝： | 管件 |
MAX3761/MAX3762
Low-Power, 622Mbps Limiting Amplifiers
with Chatter-Free Power Detect for LANs
6
_______________________________________________________________________________________
_______________Detailed Description
Figure 1 shows the functional diagram for the MAX3761/
MAX3762. The input signal is applied to VIN+ and VIN-.
A chain of amplifier stages, each contributing approxi-
mately 12.5dB of gain, amplifies the input signal to
PECL output voltage swings. A 4mVp-p input signal will
cause the output to fully limit.
Received-Signal-Strength
Indicator (RSSI)
Each amplifier stage contains a full-wave logarithmic
detector (FWD). The full-wave detector outputs are
summed at the FILTER pin and used to generate the
received-signal-strength indication (RSSI). The RSSI
output voltage is linearly proportional to the input power
(in decibels), and is approximated by:
where VIN is the peak-to-peak input signal in millivolts.
The RSSI output is insensitive to fluctuations in temperature
and supply voltage. The power detector functions as a
broadband power meter that detects the total power of all
signals present in the passband of approximately 750MHz.
Refer to the
Typical Operating Characteristics graphs show-
ing RSSI output versus input power and signal amplitude.
The high-speed RSSI signal is filtered with one external
capacitor connected from FILTER to VCC. The imped-
ance at the FILTER pin is approximately 500
Ω.
The FILTER capacitor (CFILTER) must be connected
to VCC for proper operation.
Input-Offset Correction
The limiting amplifier provides approximately 60dB of
gain. An input DC offset of even 1mV reduces the
power-detection circuit’s accuracy and can cause the
output to limit. A low-frequency feedback loop is inte-
grated into the MAX3761/MAX3762 to remove input off-
set. DC coupling the inputs is not recommended, as
this prevents the DC-offset-correction circuitry from
functioning properly. Input offset is typically reduced to
less than 100μV.
The capacitance between pins CZP and CZN, in parallel
with a 10pF integrated capacitance, determines the off-
set-correction circuit’s time constant. The input imped-
ance between CZP and CZN is approximately 800k
Ω.
The offset correction circuitry requires an average data-
input duty cycle of 50%. If the input data has a different
average duty cycle, the output will have increased
pulse-width distortion.
V
(V) = 1.13 + 0.457log (V )
RSSI
IN
LIMITER
FWD
LIMITER
FWD
LIMITER
FWD
FILTER
REF
INV
VTH
R1
R2
GNDO
LOS+/LOS-
VCC - 2V
RSSI
50
Ω
OUT+/OUT-
DISABLE
VCCO
EN
CZN
CAZ
CZP
SUB
GND
VCC
VIN+/VIN-
CIN
CFILTER
VCC
FWD = FULL-WAVE DETECTOR
LIMITER
FWD
MAX3761/MAX3762
Figure 1. Functional Diagram
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX3761EEP+ | 功能描述:限幅放大器 622Mbps w/Chatter Free Power Detect 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 |
| MAX3761EEP+T | 功能描述:限幅放大器 622Mbps w/Chatter Free Power Detect 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 |
| MAX3761EEP-T | 功能描述:限幅放大器 622Mbps w/Chatter Free Power Detect 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 |
| MAX3761EVKIT-SO | 功能描述:限幅放大器 Evaluation Kit for the MAX3761 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 |
| MAX3762E/D | 功能描述:限幅放大器 DICE SALES DICE 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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