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參數(shù)資料
| 型號： | LT1227M |
| 廠商： | Linear Technology Corporation |
| 英文描述： | 140MHz Video Current Feedback Amplifier |
| 中文描述： | 140MHz的視頻電流反饋放大器 |
| 文件頁數(shù)： | 9/12頁 |
| 文件大?。?/td> | 326K |
| 代理商： | LT1227M |
9
LT1227
U
S
A
O
PPLICATI
U
U
V
OUT
AI04
Settling Time
The characteristic curves show that the LT1227 amplifier
settles to within 10mV of final value in 40ns to 55ns for any
output step up to 10V. The curve of settling to 1mV of final
value shows that there is a slower thermal contribution up
to 20
μ
s. The thermal settling component comes from the
output and the input stage. The output contributes just
under 1mV per volt of output change and the input
contributes 300
μ
V per volt of input change. Fortunately
the input thermal tends to cancel the output thermal. For
this reason the noninverting gain of two configuration
settles faster than the inverting gain of one.
Large-Signal Transient Response, A
V
= –2
V
OUT
AI04
Large-Signal Transient Response, A
V
= +2
Shutdown
The LT1227 has a high impedance, low supply current
mode which is controlled by pin 8. In the shutdown mode,
the output looks like a 12pF capacitor and the supply
current drops to approximately the pin 8 current. The
shutdown pin is referenced to the positive supply through
an internal pullup circuit (see the simplified schematic).
Pulling a current of greater than 50
μ
A from pin 8 will put
the device into the shutdown mode. An easy way to force
shutdown is to ground pin 8, using open drain (collector)
logic. Because the pin is referenced to the positive supply,
the logic used should have a breakdown voltage of greater
than the positive supply voltage. No other circuitry is
necessary as an internal JFET limits the pin 8 current to
about 100
μ
A. When pin 8 is open, the LT1227 operates
normally.
Differential Input Signal Swing
The differential input swing is limited to about
±
6V by an
ESD protection device connected between the inputs. In
normal operation, the differential voltage between the
input pins is small, so this clamp has no effect; however,
in the shutdown mode, the differential swing can be the
same as the input swing. The clamp voltage will then set
the maximum allowable input voltage. To allow for some
margin, it is recommended that the input signal be less
than
±
5V when the device is shutdown.
Offset Adjust
Pins 1 and 5 are provided for offset nulling. A small current
to V
+
or ground will compensate for DC offsets in the
device. The pins are referenced to the positive supply (see
the simplified schematic) and should be left open if un-
used. The offset adjust pins act primarily on the inverting
input bias current. A 10k pot connected to pins 1 and 5 with
the wiper connected to V
+
will null out the bias current, but
will not affect the offset voltage much. Since the output
offset is
V
O
A
V
V
OS
+ (I
IN
–
) R
F
at higher gains (A
V
> 5), the V
OS
term will dominate. To null
out the V
OS
term, use a 10k pot between pins 1 and 5 with
a 150k resistor from the wiper to ground for 15V split
supplies, 47k for 5V split supplies.
AI03
R
F
= 1k, R
G
= 1k, R
L
= 400
R
F
= 1k, R
G
= 510
, R
L
= 400
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