参数资料
型号: MCP669T-E/ML
厂商: Microchip Technology
文件页数: 19/68页
文件大小: 0K
描述: IC OPAMP QUAD 60MHZ 16QFN
标准包装: 3,300
放大器类型: 通用
电路数: 4
输出类型: 满摆幅
转换速率: 32 V/µs
增益带宽积: 60MHz
电流 - 输入偏压: 6pA
电压 - 输入偏移: 1800µV
电流 - 电源: 6mA
电流 - 输出 / 通道: 80mA
电压 - 电源,单路/双路(±): 2.5 V ~ 5.5 V,±1.25 V ~ 2.75 V
工作温度: -40°C ~ 125°C
安装类型: 表面贴装
封装/外壳: 16-VQFN 裸露焊盘
供应商设备封装: 16-QFN(4x4)
包装: 带卷 (TR)
MCP660/1/2/3/4/5/9
DS22194D-page 26
2009-2012 Microchip Technology Inc.
4.8
Typical Applications
4.8.1
50
LINE DRIVER
Figure 4-10 shows the MCP661 driving a 50
line. The
large output current (e.g., see Figure 2-18) makes it
possible to drive a back-matched line (RM2, the 50
line and the 50
load at the far end) to more than ±2V
(the load at the far end sees ±1V). It is worth mention-
ing that the 50
line and the 50 load at the far end
together can be modeled as a simple 50
resistor to
ground.
FIGURE 4-10:
50
Line Driver.
The output headroom limits would be VOL = -2.3V and
VOH = +2.3V (see Figure 2-16), leaving some design
room for the ±2V signal. The open-loop gain (AOL)
typically does not decrease significantly with a 100
load (see Figure 2-11). The maximum power dissipated
is about 48 mW (see Section 4.2.3 “Power
Dissipation”), so the temperature rise (for the
MCP661 in the SOIC-8 package) is under 8°C.
4.8.2
OPTICAL DETECTOR AMPLIFIER
Figure 4-11 shows a transimpedance amplifier, using
the MCP661 op amp, in a photo detector circuit. The
photo detector is a capacitive current source. RF pro-
vides enough gain to produce 10 mV at VOUT. CF stabi-
lizes the gain and limits the transimpedance bandwidth
to about 1.1 MHz. The parasitic capacitance of RF (e.g.,
0.2 pF for a 0805 SMD) acts in parallel with CF.
FIGURE 4-11:
Transimpedance Amplifier
for an Optical Detector.
4.8.3
H-BRIDGE DRIVER
Figure 4-12 shows the MCP662 dual op amp used as
an H-bridge driver. The load could be a speaker or a
DC motor.
FIGURE 4-12:
H-Bridge Driver.
This circuit automatically makes the noise gains (GN)
equal, when the gains are set properly, so that the fre-
quency responses match well (in magnitude and in
phase). Equation 4-7 shows how to calculate RGT and
RGB so that both op amps have the same DC gains;
GDM needs to be selected first.
EQUATION 4-7:
Equation 4-8 gives the resulting Common mode and
Differential mode output voltages.
EQUATION 4-8:
RF
301
RG
301
RM1
49.9
50
RM2
49.9
50
Line
+2.5V
-2.5V
MCP66X
Photo
Detector
CD
CF
RF
VDD/2
30pF
100 k
1.5 pF
ID
100 nA
VOUT
MCP661
RF
VIN
VOT
RF
RGB
VOB
VDD/2
RGT
RL
MCP662
GDM
VOT VOB
VIN VDD 2
--------------------------------- 1 V/V
RGT
RF
GDM 2
1
---------------------------------
=
RGB
RF
GDM 2
-------------------
=
VOT V
+ OB
2
---------------------------
VDD
2
-----------
=
VOT V
OB
GDM VIN
VDD
2
-----------
=
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