參數(shù)資料
型號(hào)： SP385EEA-L
廠商： Exar Corporation
文件頁(yè)數(shù)： 14/15頁(yè)
文件大?。?/td> 0K
描述： IC DVR/RCVR RS232 DUAL 20SSOP
標(biāo)準(zhǔn)包裝： 66
類型： 收發(fā)器
驅(qū)動(dòng)器/接收器數(shù)： 2/2
規(guī)程： RS232
電源電壓： 3 V ~ 5 V
安裝類型： 表面貼裝
封裝/外殼： 20-SSOP（0.209"，5.30mm 寬）
供應(yīng)商設(shè)備封裝： 20-SSOP
包裝： 管件
其它名稱： 1016-1156-5
8
Exar Corporation 48720 Kato Road, Fremont CA, 94538 510-668-7017 www.exar.com
SP385E_100_030811
Charge Pump
The charge pump is a Exar–patented design
(5,306,954) and uses a unique approach
compared to older less–efficient designs. The
charge pump still requires four external capaci-
tors, but uses a four–phase voltage shifting
technique to attain symmetrical 10V power
supplies. There is a free–running oscillator
that controls the four phases of the voltage
shifting. A description of each phase follows.
Phase 1
— V
SS charge storage —During this phase of
the clock cycle, the positive side of capacitors
C1 and C2 are initially charged to +5V. Cl+
is then switched to ground and the charge in
C1– is transferred to C2–. Since C2+ is con-
nected to +5V, the voltage potential across
capacitor C2 is now 10V.
Phase 2
— V
SS transfer — Phase two of the clock con-
nects the negative terminal of C2 to the V
SS
storage capacitor and the positive terminal of
C2 to ground, and transfers the generated
–l0V to C3. Simultaneously, the positive side of
capacitor C 1 is switched to +5V and the nega-
tive side is connected to ground.
Phase 3
— V
DD charge storage — The third phase of
the clock is identical to the first phase — the
charge transferred in C1 produces –5V in the
negative terminal of C1, which is applied to the
negative side of capacitor C2. Since C2+ is at
+5V, the voltage potential across C2 is l0V.
Phase 4
— V
DD transfer — The fourth phase of the
clock connects the negative terminal of C2
to ground, and transfers the generated l0V
across C2 to C4, the V
DD storage capacitor.
Again, simultaneously with this, the positive
side of capacitor C1 is switched to +5V and
the negative side is connected to ground, and
the cycle begins again.
Since both V+ and V– are separately gener-
ated from V
CC; in a no–load condition V+ and
V– will be symmetrical. Older charge pump
approaches that generate V– from V+ will
show a decrease in the magnitude of V– com-
pared to V+ due to the inherent inefficiencies
in the design.
The clock rate for the charge pump typically
operates at 15kHz. The external capacitors
can be as low as 0.1F with a 16V breakdown
voltage rating.
Figure 1. Charge Pump Waveform
+10V
a) C2+
GND
b) C2–
–10V
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
SP385EEA-L/TR 功能描述:RS-232接口集成電路 3V to +5V RS-232 Line Driver/Receiver RoHS:否 制造商:Exar 數(shù)據(jù)速率:52 Mbps 工作電源電壓:5 V 電源電流:300 mA 工作溫度范圍:- 40 C to + 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:LQFP-100 封裝:
SP385EET 制造商:SIPEX 制造商全稱:Sipex Corporation 功能描述:Enhanced +3V or +5V RS-232 Line Driver/Receiver
SP385EET/TR 制造商:SIPEX 制造商全稱:Sipex Corporation 功能描述:Enhanced +3V or +5V RS-232 Line Driver/Receiver
SP385EET-L 功能描述:RS-232接口集成電路 3V to +5V RS-232 Line Driver/Receiver RoHS:否 制造商:Exar 數(shù)據(jù)速率:52 Mbps 工作電源電壓:5 V 電源電流:300 mA 工作溫度范圍:- 40 C to + 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:LQFP-100 封裝:
SP385EET-L/TR 功能描述:RS-232接口集成電路 3V to +5V RS-232 Line Driver/Receiver RoHS:否 制造商:Exar 數(shù)據(jù)速率:52 Mbps 工作電源電壓:5 V 電源電流:300 mA 工作溫度范圍:- 40 C to + 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:LQFP-100 封裝:
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