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參數(shù)資料
| 型號： | LT6211IMS |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 音頻／視頻放大 |
| 英文描述： | Single/Dual Programmable Supply Current, R-R Output, Current Feedback Amplifiers |
| 中文描述： | 1 CHANNEL, VIDEO AMPLIFIER, PDSO10 |
| 封裝： | PLASTIC, MSOP-10 |
| 文件頁數(shù)： | 13/16頁 |
| 文件大?。?/td> | 457K |
| 代理商： | LT6211IMS |
13
LT6210/LT6211
62101f
Capacitive Loads
The LT6210/LT6211 are stable with any capacitive load.
Although peaking and overshoot may result in the AC
transient response, the amplifier’s compensation decreases
bandwidth with increasing output capacitive load to en-
sure stability. To maintain a response with minimal peak-
ing, the feedback resistor can be increased at the cost of
bandwidth as shown in the Typical Performance Charac-
teristics. Alternatively, a small resistor (5
to 35
) can be
put in series with the output to isolate the capacitive load
from the amplifier output. This has the advantage that the
amplifier bandwidth is only reduced when the capacitive
load is present. The disadvantage of this technique is that
the gain is a function of the load resistance.
Power Supplies
The LT6210/LT6211 will operate on single supplies from
3V to 12V and on split supplies from
±
1.5V to
±
6V. If split
supplies of unequal absolute value are used, input offset
voltage and inverting input current will shift from the
values specified in the Electrical Characteristics table.
Input offset voltage will shift 2mV and inverting input
current will shift 0.5
μ
A for each volt of supply mismatch.
Slew Rate
Unlike a traditional voltage feedback op amp, the slew rate
of a current feedback amplifier is not independent of the
amplifier gain configuration. In a current feedback ampli-
fier, both the input stage and the output stage have slew
rate limitations. In the inverting mode, and for gains of 2
or more in the noninverting mode, the signal amplitude
between the input pins is small and the overall slew rate is
that of the output stage. For gains less than 2 in the
noninverting mode, the overall slew rate is limited by the
input stage. The input slew rate of the LT6210/LT6211 on
±
5V supplies with an R
SET
resistor of 20k (I
S
= 6mA) is
approximately 600V/
μ
s and is set by internal currents and
capacitances. The output slew rate is additionally con-
strained by the value of the feedback resistor and internal
capacitance. At a gain of 2 with 887
feedback and gain
resistors,
±
5V supplies and the same biasing as above, the
output slew rate is typically 700V/
μ
s. Larger feedback
resistors, lower supply voltages and lower supply current
levels will all reduce slew rate. Input slew rates signifi-
cantly exceeding the output slew capability can actually
decrease slew performance in a positive gain configura-
tion; the cleanest transient response will be obtained from
input signals with slew rates slower than 1000V/
μ
s.
Output Swing and Drive
The output stage of the LT6210/LT6211 consists of a pair
of class-AB biased common emitters that enable the
output to swing rail-to-rail. Since the amplifiers can poten-
tially deliver output currents well beyond the specified
minimum short-circuit current, care should be taken not
to short the output of the device indefinitely. Attention
must be paid to keep the junction temperature of the IC
below the absolute maximum rating of 150
°
C if the output
is used to drive low impedance loads. See Note 5 for
details. Additionally, the output of the amplifier has re-
verse-biased ESD diodes connected to each supply. If the
output is forced beyond either supply, large currents will
flow through these diodes. If the current is limited to 80mA
or less, no damage to the part will occur.
APPLICATIOU
W
U
U
U
TYPICAL APPLICATIO
3V Cable Driver with Active Termination
Driving back-terminated cables on single supplies usually
results in very limited signal amplitude at the receiving end
of the cable. However, positive feedback can be used to
reduce the size of the series back termination resistor,
thereby decreasing the attenuation between the series and
shunt termination resistors while still maintaining con-
trolled output impedance from the line-driving amplifier.
Figure 3 shows the LT6210 using this “active termination”
scheme on a single 3V supply. The amplifier is AC-coupled
and in an inverting gain configuration to maximize the
input signal range. The gain from V
IN
to the receiving end
of the cable, V
OUT
, is set to –1. The effective impedance
looking into the amplifier circuit from the cable is 50
throughout the usable bandwidth.
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