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參數(shù)資料
| 型號： | LT6211CDD |
| 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： | 3 X 3 MM, 0.80 MM HEIGHT, PLASTIC, MO-229WEED-2, DFN-10 |
| 文件頁數(shù)： | 12/16頁 |
| 文件大?。?/td> | 457K |
| 代理商： | LT6211CDD |
12
LT6210/LT6211
62101f
APPLICATIOU
Setting the Quiescent Operating Current (I
SET
Pin)
The quiescent bias point of the LT6210/LT6211 is set with
either an external resistor from the I
SET
pin to a lower
potential or by drawing a current out of the I
SET
pin.
However, the I
SET
pin is not designed to function as a
shutdown. The LT6211 uses two entirely independent bias
networks, so while each channel can be programmed for
a different supply current, neither I
SET
pin should be left
unconnected. A simplified schematic of the internal bias-
ing structure can be seen in Figure1. Figure 2 illustrates
the results of varying R
SET
on 3V and
±
5V supplies. Note
that shorting the I
SET
pin under 3V operation results in a
quiescent bias of approximately 6mA. Attempting to bias
the LT6210/LT6211 at a current level higher than 6mA by
using a smaller resistor may result in instability and
decreased performance. However, internal circuitry clamps
the supply current of the part at a safe level of approxi-
mately 15mA in case of accidental connection of the I
SET
pin directly to a negative potential.
W
U
U
Input Considerations
The inputs of the LT6210/LT6211 are protected by back-
to-back diodes. If the differential input voltage exceeds
1.4V, the input current should be limited to less than the
absolute maximum ratings of
±
10mA. In normal opera-
tion, the differential voltage between the inputs is small, so
the
±
1.4V limit is generally not an issue. ESD diodes
protect both inputs, so although the part is not guaranteed
to function outside the common mode range, input volt-
ages that exceed a diode beyond either supply will also
require current limiting to keep the input current below the
absolute maximum of
±
10mA.
Feedback Resistor Selection
The small-signal bandwidth of the LT6210/LT6211 is set
by the external feedback resistors and the internal junction
capacitances. As a result, the bandwidth is a function of the
quiescent supply current, the supply voltage, the value of
the feedback resistor, the closed-loop gain and the load
resistor. Refer to the Typical AC Performance table for
more information.
Layout and Passive Components
As with all high speed amplifiers, the LT6210/LT6211
require some attention to board layout. Low ESL/ESR
bypass capacitors should be placed directly at the positive
and negative supply (0.1
μ
F ceramics are recommended).
For best transient performance, additional 4.7
μ
F tantalums
should be added. A ground plane is recommended and
trace lengths should be minimized, especially on the
inverting input lead.
Capacitance on the Inverting Input
Current feedback amplifiers require resistive feedback
from the output to the inverting input for stable operation.
Capacitance on the inverting input will cause peaking in the
frequency response and overshoot in the transient re-
sponse. Take care to minimize the stray capacitance at the
inverting input to ground and between the output and the
inverting input. If significant capacitance is unavoidable in
a given application, an inverting gain configuration should
be considered. When configured inverting, the amplifier
inputs do not slew and the effect of parasitics is greatly
reduced.
6
5
V
+
TO
BIAS
CONTROL
600
600
8k
I
SET
6210 F01
Figure 1. Internal Bias Setting Circuitry
Figure 2. Setting R
SET
to Control I
S
10
1
0.1
0.01
0.1
1
10
100
1000
R
SET
PROGRAMMING RESISTOR (k
)
S
6210 F02
V
S
=
±
5V
R
SET
TO GND
V
S
= 3V
R
SET
TO GND
T
A
= 25
°
C
R
L
=
∞
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