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參數(shù)資料
| 型號(hào)： | MAX4006EUT+T |
| 廠商： | Maxim Integrated |
| 文件頁(yè)數(shù)： | 8/10頁(yè) |
| 文件大?。?/td> | 421K |
| 描述： | IC CURRENT MONITOR 1% SOT23-6 |
| 產(chǎn)品培訓(xùn)模塊： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 標(biāo)準(zhǔn)包裝： | 1 |
| 功能： | 電流監(jiān)控器 |
| 檢測(cè)方法： | 高端 |
| 精確度： | ±1% |
| 輸入電壓： | 2.7 V ~ 22 V |
| 工作溫度： | -40°C ~ 85°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | SOT-23-6 |
| 供應(yīng)商設(shè)備封裝： | SOT-6 |
| 包裝： | 標(biāo)準(zhǔn)包裝 |
| 產(chǎn)品目錄頁(yè)面： | 1414 (CN2011-ZH PDF) |
| 其它名稱： | MAX4006EUT+TDKR |
In many fiber applications, OUT is connected directly to
an ADC that operates from a supply voltage that is less
than the voltage at BIAS. Connecting the
MAX4004/MAX4006s clamping diode output, CLAMP,
to the ADC power supply helps avoid damage to the
ADC. Without this protection, voltages can develop at
OUT that can destroy the ADC. This protection is less
critical when OUT is connected directly to subsequent
transimpedance amplifiers (linear or logarithmic) that
have low-impedance, near-ground-referenced inputs. If
a transimpedance amp is used on the low side of the
photodiode, its voltage drop must also be considered.
Leakage from the clamping diode is most often insignif-
icant over nominal operating conditions, but grows with
temperature.
To maintain low levels of wideband noise, lowpass filter-
ing the output signal is suggested in applications where
only DC measurements are required. Determining the
required filtering components is straightforward, as the
MAX4004 exhibits a very high output impedance
(>5M&), while the MAX4006 exhibits an output resis-
tance of 10k&.
In some applications where pilot tones are used to iden-
tify specific fiber channels, higher bandwidths are
desired at OUT to detect these tones. Consider the mini-
mum and maximum currents to be detected, then con-
sult the frequency response and noise typical operating
curves. If the minimum current is too small, insufficient
monitor bandwidth could result, while too high of a cur-
rent could result in excessive monitor noise across the
desired bandwidth.
Bypassing and External Components
In applications where power-supply noise can interfere
with DC diode measurements, additional filtering is sug-
gested. Such noise is commonly seen when switching
power supplies are used to generate the photodiode
bias voltage. As shown in the typical operating circuit, a
pi filter (two 0.22礔 capacitors and one 2.2礖 inductor)
greatly suppress power-supply switching noise. If such
a filter is already present in the bias-generating circuit,
only a simple bypass capacitor at the BIAS pin is sug-
gested. The output lowpass filter, a 10k& resistor and a
10nF capacitor, further reduce permeating power-sup-
ply noise as well as other wideband noise that might
otherwise restrict measurements at low signal levels.
Again, reducing the bandwidth of the OUT signal can
affect performance of pilot-tone systems.
To restrict high-frequency photodiode signals from
affecting the current monitor and BIAS power supply, an
RF choke and 10nF capacitor can be added. The
capacitance presented to REF should not exceed 10nF;
larger values increase startup time and could cause the
thermal shutdown circuit to activate during startup.
High-Accuracy, High-Side Current Monitors
in SOT23
8 _______________________________________________________________________________________
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| MAX4007EUT+T | 功能描述:電流和電力監(jiān)控器、調(diào)節(jié)器 High-Side Current Monitor RoHS:否 制造商:STMicroelectronics 產(chǎn)品:Current Regulators 電源電壓-最大:48 V 電源電壓-最小:5.5 V 工作溫度范圍:- 40 C to + 150 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:HPSO-8 封裝:Reel |
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