LT1209C View Datasheet(PDF) - Linear Technology
Part Name
Description
MFG CO.
'LT1209C' PDF : 12 Pages View PDF
APPLICATI S I FOR ATIO
Small-Signal Capacitive Loading
AV = –1
CL = 1000pF
1208/09 AI01
Large-Signal Capacitive Loading
LT1208/LT 1209
caused by a second pole beyond the unity-gain crossover.
This is reflected in the 50° phase margin and shows up as
overshoot in the unity-gain small-signal transient re-
sponse. Higher noise gain configurations exhibit less
overshoot as seen in the inverting gain of one response.
The large-signal response in both inverting and non-
inverting gain show symmetrical slewing characteristics.
Normally the noninverting response has a much faster
rising edge due to the rapid change in input common-
mode voltage which affects the tail current of the input
differential pair. Slew enhancement circuitry has been
added to the LT1208/LT1209 so that the falling edge slew
rate is balanced.
Small-Signal Transient Response
AV = 1
CL = 10,000pF
1208/09 AI02
Input Considerations
Resistors in series with the inputs are recommended for
the LT1208/LT1209 in applications where the differential
input voltage exceeds ±6V continuously or on a transient
basis. An example would be in noninverting configura-
tions with high input slew rates or when driving heavy
capacitive loads. The use of balanced source resistance at
each input is recommended for applications where DC
accuracy must be maximized.
Transient Response
The LT1208/LT1209 gain-bandwidth is 45MHz when mea-
sured at 100kHz. The actual frequency response in unity-
gain is considerably higher than 45MHz due to peaking
AV = 1
1208/09 AI03
Small-Signal Transient Response
AV = –1
1208/09 AI04
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