LT1969CMS#TR Linear Technology, LT1969CMS#TR Datasheet - Page 12

• Manufacturer Part Number: LT1969CMS#TR
• Description: IC OP-AMP ADJ CURRNT DUAL 10MSOP
• Manufacturer: Linear Technology

Specifications of LT1969CMS#TR

• Amplifier Type: General Purpose
• Number Of Circuits: 2
• Slew Rate: 200 V/µs
• Gain Bandwidth Product: 700MHz
• Current - Input Bias: 1.5µA
• Voltage - Input Offset: 1000µV
• Current - Supply: 7mA
• Current - Output / Channel: 700mA
• Voltage - Supply, Single/dual (±): 4 V ~ 13 V, ±2 V ~ 6.5 V
• Operating Temperature: 0°C ~ 70°C
• Mounting Type: Surface Mount
• Package / Case: 10-MSOP, Micro10™, 10-uMAX, 10-uSOP
• Power Supply Requirement: Dual
• Package Type: MSOP
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Output Type: -
• -3db Bandwidth: -
• Lead Free Status / Rohs Status: Not Compliant
• Other names: LT1969CMSTR

APPLICATIO S I FOR ATIO
LT1969
Capacitive Loading
The LT1969 is stable with a 1000pF capacitive load. The
photo of the small-signal response with 1000pF load in a
gain of 10 shows 50% overshoot. The photo of the large-
signal response with a 1000pF load shows that the output
slew rate is not limited by the short-circuit current. The
Typical Performance Curve of Frequency Response vs
Capacitive Load shows the peaking for various capacitive
loads.
This stability is useful in the case of directly driving a
coaxial cable or twisted pair that is inadvertently
unterminated. For best pulse fidelity, however, a termina-
tion resistor of value equal to the characteristic impedance
of the cable or twisted pair (i.e., 50 /75 /100 /135 )
should be placed in series with the output. The other end
of the cable or twisted pair should be terminated with the
same value resistor to ground.
12
U
U
(OPTIONAL)
(OPTIONAL)
W
V
i
Figure 3. Compensation for Noninverting Gains
R
Figure 2. Compensation for Inverting Gains
C
V
G
C
C
i
R
C
R
R
C
C
G
U
–
+
+
–
R
R
F
F
Compensation
The LT1969 is stable in a gain 10 or higher for any supply
and resistive load. It is easily compensated for lower gains
with a single resistor or a resistor plus a capacitor.
Figure 2 shows that for inverting gains, a resistor from the
inverting node to AC ground guarantees stability if the
parallel combination of R
R
capacitor, C
frequencies. The break frequency produced by R
should be less than 15MHz to minimize peaking. The
Typical Curve of Frequency Response vs Supply Voltage,
A
frequency of 12.8MHz.
Figure 3 shows compensation in the noninverting configu-
ration. The R
case. The input impedance is not reduced because the
V
F
/9. For lowest distortion and DC output offset, a series
= –1 shows less than 1dB of peaking for a break
V
V
o
o
2 R
(R
V
V
C
(R
2 R
V
V
o
i
C
, can be used to reduce the noise gain at lower
o
C
i
1
C
C
1
|| R
= 1 +
, C
C
|| R
C
=
C
C
C
G
G
)
C
–R
< 15MHz
R
) R
< 15MHz
G
R
R
F
network acts similarly to the inverting
R
1969 F03
G
F
1969 F02
F
F
/9
/9
C
and R
G
is less than or equal to
C
and C
C