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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： | 6/25页 |
| 文件大小： | 860K |
| 代理商： | V62/09616-01XE |
OPERATING SUGGESTIONS
SETTING RESISTOR VALUES TO OPTIMIZE
R =
O
2
75
(n
1)+804
-
1+
[75
(n
1)+804]
-
2
241200
- 1
DESIGN-IN TOOLS
DEMONSTRATION FIXTURE
R
F
V
O
R
G
R
I
Z
i
(S) ERR
i
ERR
a
V
I
MACROMODELS AND APPLICATIONS SUPPORT
SBOS444 – DECEMBER 2008........................................................................................................................................................................................... www.ti.com
Solving for RO, with n devices connected together,
results in Equation 3:
BANDWIDTH
The
output
stage
of
the
OPA4872
is
a
current-feedback op amp, meaning it can hold an
almost constant bandwidth over signal gain settings
(3)
with the proper adjustment of the external resistor
Results for n varying from 2 to 6 are given in Table 2.
values. This performance is shown in the Typical
Characteristic curves; the small-signal bandwidth
Table 2. Series Resistance vs
decreases only slightly with increasing gain. These
Number of Parallel Outputs
curves also show that the feedback resistor has been
changed for each gain setting. The resistor values on
NUMBER OF OPA4872s
RO ()
the feedback path can be treated as frequency
2
69
response compensation elements while the ratio sets
3
63.94
the signal gain of the feedback resistor divided by the
4
59.49
gain resistor. Figure 32 shows the small-signal
5
55.59
frequency response analysis circuit for a current
feedback amplifier.
6
52.15
The two major limitations of this circuit are the device
requirements for each OPA4872 and the acceptable
return loss resulting from the mismatch between the
load and the matching resistor.
A printed circuit board (PCB) is available to assist in
the initial evaluation of circuit performance using the
OPA4872. The fixture is offered free of charge as an
unpopulated PCB, delivered with a user's guide. The
summary information for this fixture is shown in
Figure 32. Recommended Feedback Resistor vs
Noise Gain
Table 3. OPA4872 Demonstration Fixture
LITERATURE
PACKAGE
ORDERING NUMBER
NUMBER
The key elements of this current-feedback op amp
model are:
SO-14
DEM-OPA-SO-1E
SBOU045
α → Buffer gain from the noninverting input to the
The demonstration fixture can be requested at the
inverting input
Texas Instruments web site at (www.ti.com) through
the OPA4872 product folder.
RI → Buffer output impedance
iERR → Feedback error current signal
Z(s)
→
Frequency-dependent
open-loop
Computer simulation of circuit performance using
transimpedance gain from iERR to VO
SPICE
is
often
useful
when
analyzing
the
performance of analog circuits and systems. This
The buffer gain is typically very close to 1.00 and is
practice is particularly true for video and RF amplifier
normally neglected from signal gain considerations. It
circuits, where parasitic capacitance and inductance
will, however, set the CMRR for a single op amp
can have a major effect on circuit performance. A
differential amplifier configuration. For a buffer gain
SPICE model for the OPA4872 is available through
α < 1.0, the CMRR = –20 × log (1 – α) dB.
the Texas Instruments web site at www.ti.com. This
model does a good job of predicting small-signal ac
and transient performance under a wide variety of
operating conditions. It does not do as well in
predicting
the
harmonic
distortion
or
dG/dP
characteristics.
14
Copyright 2008, Texas Instruments Incorporated
Product Folder Link(s): OPA4872-EP
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