LT1367CS Linear Technology, LT1367CS Datasheet - Page 13

• Manufacturer Part Number: LT1367CS
• Description: IC OP-AMP R-R IN/OUT QUAD 14SOIC
• Manufacturer: Linear Technology

Specifications of LT1367CS

• Amplifier Type: General Purpose
• Number Of Circuits: 4
• Output Type: Rail-to-Rail
• Slew Rate: 0.13 V/µs
• Gain Bandwidth Product: 400kHz
• Current - Input Bias: 10nA
• Voltage - Input Offset: 200µV
• Current - Supply: 370µA
• Current - Output / Channel: 75mA
• Voltage - Supply, Single/dual (±): 1.8 V ~ 30 V, ±0.9 V ~ 15 V
• Operating Temperature: 0°C ~ 70°C
• Mounting Type: Surface Mount
• Package / Case: 14-SOIC (3.9mm Width), 14-SOL
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• -3db Bandwidth: -

100mV/DIV
100mV/DIV
applicaTions inForMaTion
Improved Supply Rejection in the LT1368/LT1369
The LT1368/LT1369 are variations of the LT1366/LT1367
offering greater supply rejection and lower high frequency
output impedance. The LT1368/LT1369 require a 0.1µF load
capacitance for compensation. The output capacitance
forms a filter, which reduces pickup from the supply and
lowers the output impedance. This additional filtering is
helpful in mixed analog/digital systems with common sup-
plies, or systems employing switching supplies. Filtering
also reduces high frequency noise, which may be beneficial
when driving A/D converters.
Typical applicaTions
Buffering A/D Converters
Figure 5 shows the LT1368 driving an LTC
nel micropower A/D converter (ADC). The LTC1288 can
accommodate voltage references and input signals equal
to the supply rails. The sampling nature of this ADC
eliminates the need for an external sample-and-hold, but
may call for a drive amplifier because of the ADC’s 12µs
settling requirement. The LT1368’s rail-to-rail operation
and low input offset voltage make it well-suited for low
power, low frequency A/D applications. Either the LT1366
or LT1368 could be used for this application. However,
for low frequencies (f < 1kHz) the LT1368 provides better
supply rejection.
V
+
V
(AC)
OUT
Figure 4a. LT1366 Power Supply Rejection Test
2µs/DIV
®
1288 2-chan-
LT1366 F04a
Figure 4 shows the outputs of the LT1366/LT1368 perturbed
by a 200mV
supply. The LT1368’s power supply rejection is about ten
times greater than that of the LT1366 at 50kHz. Note the
5-to-1 scale change in the output voltage traces.
The tolerance of the external compensation capacitor is
not critical. The plots of Overshoot vs Load Current in the
Typical Performance Characteristics section illustrate the
effect of a capacitive load.
V
V
100mV/DIV
20mV/DIV
0
1
V
+
V
+
–
+
–
(AC)
1/2 LT1368
1/2 LT1368
OUT
Figure 4b. LT1368 Power Supply Rejection Test
Figure 5. 2-Channel Low Power A/D Converter
P-P
50kHz square wave added to the positive
0.1µF
0.1µF
0.1µF
2µs/DIV
LT1366/LT1367
LT1368/LT1369
V
CC
CS/SHDN
CH0
CH1
GND
LTC1288
V
CC
(REF)
D
LT1366 FO5
CLK
OUT
D
IN
1µF
LT1366 F04b

TO µP
1366fb