LT6552CS8#TR Linear Technology, LT6552CS8#TR Datasheet - Page 13

• Manufacturer Part Number: LT6552CS8#TR
• Description: IC OPAMP VID DIFF SGL 3.3V 8SOIC
• Manufacturer: Linear Technology

Specifications of LT6552CS8#TR

• Applications: Differential
• Number Of Circuits: 1
• -3db Bandwidth: 75MHz
• Slew Rate: 600 V/µs
• Current - Supply: 14mA
• Current - Output / Channel: 70mA
• Voltage - Supply, Single/dual (±): 3 V ~ 12.6 V, ±1.5 V ~ 6.3 V
• Mounting Type: Surface Mount
• Package / Case: 8-SOIC (0.154", 3.90mm Width)
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

APPLICATIO S I FOR ATIO
Layout and Passive Components
With a bandwidth of 75MHz and a slew rate of 600V/ s, the
LT6552 requires special attention to board layout and
supply bypassing. Use a ground plane, short lead lengths
and RF quality low ESR supply bypass capacitors. The
positive supply pin should be bypassed with a small
capacitor (typically 0.1 F) within 1 inch of the pin. When
driving loads greater than 10mA, an additional 4.7 F
electrolytic capacitor should be used. When using split
supplies, the same is true for the negative supply pin. The
parallel combination of the feedback resistor and gain
setting resistor on Pin 8 (FB) can combine with the input
capacitance to form a pole which can degrade stability. In
general, use feedback resistors of 1k or less.
1.5V
A
R
R
V
F
L
= 2
= R
Figure 7A. Small Signal Transient
= 150
G
= 500
Response, V
U
U
50ns/DIV
S
= 3.3V, 0V
W
Figure 6. Closed-Loop Gain vs Frequency
6552 F07a
10
9
8
7
6
5
4
3
2
1
0
0.1
A
R
R
T
V
V
U
A
V
F
L
OUT
S
= R
= 25 C
= 2
= 150
= 3.3V, 0V
= 1.5V DC
G
= 500
FREQUENCY (MHz)
1
C
F
C
= 5pF
C
Operating with Low Closed-Loop Gains
The LT6552 has been optimized for closed-loop gains of
2 or greater. For a closed-loop gain of 2 the response
peaks about 3dB. Peaking can be reduced by using low
value feedback resistors, and can be eliminated by placing
a capacitor across the feedback resistor (feedback zero).
Figure 6 shows the closed-loop gain of 2 frequency
response with various values of the feedback capacitor.
This peaking shows up as a time domain overshoot of
40%; with an 8pF feedback capacitor the overshoot is
eliminated. Figures 7A and 7B show the Small Signal
Response of the LT6552 with and without an 8pF feedback
capacitor.
C
F
F
F
= 3pF
= 8pF
= 10pF
10
1.5V
C
Figure 7B. Small Signal Transient Response,
F
V
= 0pF
S
A
C
R
R
V
F
F
L
6552 F06
= 3.3V, 0V with 8pF Feedback Capacitor
= 8pF
= R
= 2
= 150
100
G
= 500
50ns/DIV
6552 F07b
LT6552
13
6552f