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参数资料
| 型号： | V62/09616-01XE |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 多路复用及模拟开关 |
| 英文描述： | 4-CHANNEL, SGL ENDED MULTIPLEXER, PDSO14 |
| 封装： | PLASTIC, MS-012AB, SOIC-14 |
| 文件页数： | 3/25页 |
| 文件大小： | 860K |
| 代理商： | V62/09616-01XE |
APPLICATION INFORMATION
WIDEBAND MULTIPLEXER OPERATION
75W
+5V
-5V
OPA4872
75W
To75
Load
W
523W
IN0
IN1
IN2
IN3
V
IN0
V
IN1
V
IN2
V
IN3
A0
A1
SD
EN
V
OUT
0.1 F
m
Optional
0.01 F
m
6.8 F
m
+
0.1 F
m
6.8 F
m
+
www.ti.com........................................................................................................................................................................................... SBOS444 – DECEMBER 2008
input of a current feedback amplifier. Depending on
the logic applied to channel control pins A0 and A1,
one switch is on at all times. Figure 27 represents the
The OPA4872 gives a new level of performance in
OPA4872 in this configuration. The truth table for
wideband
multiplexers.
shows
the
channel selection is shown in Table 1.
dc-coupled, gain of +2 V/V, dual power-supply circuit
used
as
the
basis
of
the
±5-V
Table 1. TRUTH TABLE
Characteristics and Typical Characteristic curves. For
A0
A1
EN
SD
VOUT
test purposes, the input impedance is set to 75
with
0
IN0
a resistor to ground and the output impedance is set
to 75
with a series output resistor. Voltage swings
1
0
IN1
reported in the specifications are taken directly at the
0
1
0
IN2
input and output pins while load powers (in dBm) are
1
0
IN3
defined at a matched 75-
load. For the circuit of
X
1
0
High-Z, IQ = 3.4 mA
Figure 27, the total effective load will be 150
||
X
1
High-Z, IQ = 1.1 mA
1046
= 131 . Logic pins A0 and A1 control which
of the four inputs is selected while EN and SD allow
The OPA4872 is in disable mode, with a quiescent
for power reduction. One optional component is
current of 3.4mA typical, when the EN pin is set to
included in Figure 27. In addition to the usual
0V. After being placed in disable mode, the OPA4872
power-supply decoupling capacitors to ground, a
is fully enabled in 6ns. For further power savings, the
0.01-
F capacitor is included between the two
SD pin can be used. Setting the SD pin to 5V places
power-supply pins. In practical printed circuit board
the device in shutdown mode with a standing
(PCB) layouts, this optional added capacitor typically
quiescent current of 1.1 mA. Note that in this
improves the 2nd-harmonic distortion performance by
shutdown mode, the OPA4872 requires 15ns to be
3 dB to 6 dB for bipolar supply operation.
fully powered again. The truth table for disable and
Even though the internal architecture of the OPA4872
shutdown modes can be found in Table 1.
includes current steering, it is advantageous to look
at it as four switches looking into the noninverting
Figure 27. DC-Coupled, G = +2V/V Bipolar Specification and Test Circuit (Channel 0 Selected)
Copyright 2008, Texas Instruments Incorporated
11
Product Folder Link(s): OPA4872-EP
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