參數(shù)資料
型號: 5962-0722301VFA
廠商: TEXAS INSTRUMENTS INC
元件分類: 運(yùn)算放大器
英文描述: OP-AMP, 5500 uV OFFSET-MAX, 3000 MHz BAND WIDTH, CDFP16
封裝: CERAMIC, CFP-16
文件頁數(shù): 15/30頁
文件大?。?/td> 1043K
代理商: 5962-0722301VFA
www.ti.com
(
)
W
-
=
-
+
k
50
V
2
I
S
CM
EXT
(2)
V
OUT-
V
S+
R
F
R
F
R
G
R
G
R
T
G=1
R
O
R
O
R
T
R
S
V
SIGNAL
R
S
V
S-
V
OUT+
V
CM
V
CM
V
BIAS
= V
CM
V
CM
V
CM
+
-
Wideband
CM
THS4513
Buffer
V
S+
CM
V
S–
50kW
ToInternal
CMCircuit
I
EXT
50kW
(
)
÷÷
è
+
-
÷÷
è
-
=
+
F
IN
IC
F
CM
S
IC
PU
R
1
R
1
V
R
1
V
R
(3)
Single-Supply Operation (3 V to 5 V)
SLOS539A – SEPTEMBER 2007 – REVISED OCTOBER 2007
performance, but it is intended to be a DC bias input
pin. Bypass capacitors are recommended on this pin
to reduce noise at the output. The external current
required to overdrive the internal resistor divider is
given by Equation 2:
where VCM is the voltage applied to the CM pin.
Figure 63. THS4513 DC Coupled Single-Supply
with Input Biased to VCM
In Figure 64 the source is referenced to ground and
so is the input termination resistor. RPU is added to
the circuit to avoid violating the VICR of the op amp.
The proper value of resistor to add can be calculated
Figure 62. CM Input Circuit
VIC is the desired input common-mode voltage, VCM =
To facilitate testing with common lab equipment, the
CM, and RIN = RG+ RS||RT. To set to mid-supply,
THS4513 EVM allows split-supply operation, and the
make the value of RPU = RG+ RS||RT.
characterization data presented in this data sheet
was taken with split-supply power inputs. The device
Table 3 is a modification of Table 1 to add the proper
easily can be used with a single-supply power input
values with RPU assuming a 50 source impedance
without
degrading
the
performance.
and setting the input and output common-mode
Figure 64, and Figure 65 show DC and AC-coupled
voltage to mid-supply.
single-supply circuits with single-ended inputs. These
There are two drawbacks to this configuration. One is
configurations
all
allow
the
input
and
output
that it requires additional current from the power
common-mode voltage to be set to mid-supply
supply. Using the values shown for a gain of 10 dB
allowing for optimum performance. The information
requires 37 mA more current with 5 V supply, and 22
presented here also can be applied to differential
mA more current with 3 V supply.
input sources.
The
other
drawback
is
this
configuration
also
In Figure 63, the signal source is referenced to a
increases the noise gain of the circuit. In the 10 dB
voltage derived from the CM pin via a unity-gain
gain case, noise gain increases by a factor of 1.5.
wideband buffer such as the BUF602. VCM is set to
mid-supply by THS4513 internal circuitry. RT along
Table 3. RPU Values for Various Gains
with the input impedance of the amplifier provides
Gain
RF
RG
RIT
RPU
input termination, which also is referenced to VCM.
6 dB
348
169
64.9
200
Note that RS and RT are added to the alternate input
10 dB
348
102
78.7
133
from the signal input to balance the amplifier.
Alternately, one resistor can be used equal to the
14 dB
348
61.9
115
97.6
combined value RG+ RS||RT on this input. This is also
20 dB
348
40.2
221
80.6
true of the circuits shown in Figure 64 and Figure 65.
22
Copyright 2007, Texas Instruments Incorporated
Product Folder Link(s): THS4513-SP
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