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LTC6248 Datasheet(PDF) 16 Page - Linear Technology

Part No. LTC6248
Description  90MHz, 2200V/μs 30V Low Power Op Amps
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LTC6248 Datasheet(HTML) 16 Page - Linear Technology

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LT6274/LT6275
16
6275fa
For more information www.linear.com/LT6275
TYPICAL APPLICATIONS
Pulse Response
Figure 5 shows the output step response of the composite
amplifier (measured at the output of the LT6275) at many
different amplitudes. At 15V output excursion, the initial
slope is measured to be 725V/μs. This slope is faster than
the 390V/μs measured with a 15V output excursion using
the simple noninverting amplifier of Figure 1. According
to Equation (3), this improvement has been made pos-
sible because the effective bandwidth of the composite
amplifier is higher (and thus has a lower τo), as intended.
Sine Waves
The composite amplifier of Figure 3 was also tested with
sine waves. Figure 6 shows the small signal closed-loop
gain and phase response. Distortion was also evaluated
for this circuit: for a 20VP-P output signal at 1MHz, HD2/
HD3 were measured to be –55dBc/–47dBc, respectively.
These numbers are more impressive when consider-
ing the very low power dissipation of the composite
amplifier, as illustrated in Figure 7. For example, for the
20VP-P/1MHz output condition mentioned above, the 5V
rail supply current is 3.75mA, for 1/2 LT6275 the ±15V
rails supply current is 2.2mA, resulting in a total power
dissipation of 85mW.
8pF
5pF
3pF
1pF
NO CAP
250ns/DIV
–10
–8
–6
–4
–2
0
2
4
6
8
10
6275 TA09
Figure 4. Composite Amplifier Step Response
vs LTC6252 Feedback Capacitance (AV = –11V/V)
Figure 5. Composite Amplifier Step Response at
Various Output Step Amplitudes (AV = –11V/V)
200ns/DIV
–15
–12
–9
–6
–3
0
3
6
9
12
15
6275 TA12
GAIN
PHASE
FREQUENCY (MHz)
0.1
1
10
100
–25
–20
–15
–10
–5
0
5
10
15
20
25
–225
–180
–135
–90
–45
0
45
90
135
180
225
6275 TA14
USING 1/2 LT6275
OUTPUT = 20VP–P
5V SUPPLY CURRENT
±15V SUPPLY CURRENT
TOTAL POWER
FREQUENCY (MHz)
0
0.5
1
1.5
2
0
1
2
3
4
5
0
30
60
90
120
150
6275 TA15
Figure 6. Composite Amplifier Closed-Loop
Gain/Phase vs Frequency
Figure 7. Composite Amplifier Supply
Current and Total Power Dissipation


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