LTC6405 Linear Technology, LTC6405 Datasheet - Page 5

• Manufacturer Part Number: LTC6405
• Description: Rail-to-Rail Input Differential Amplifier/Driver
• Manufacturer: Linear Technology

www.DataSheet4U.com
ELECTRICAL CHARACTERISTICS
Note 1: Stresses beyond those listed under Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to any Absolute
Maximum Rating condition for extended periods may affect device
reliability and lifetime.
Note 2: Input pins (+IN, –IN, V
steering diodes to either supply. If the inputs should exceed either supply
voltage, the input current should be limited to less than 10mA. In addition,
the inputs +IN, –IN are protected by a pair of back-to-back diodes. If the
differential input voltage exceeds 1.4V, the input current should be limited
to less than 10mA.
Note 3: A heat sink may be required to keep the junction temperature
below the Absolute Maximum Rating when the output is shorted
indefi nitely.
Note 4: The LTC6405C/LTC6405I are guaranteed functional over the
operating temperature range –40°C to 85°C.
Note 5: The LTC6405C is guaranteed to meet specifi ed performance from
0°C to 70°C. The LTC6405C is designed, characterized, and expected
to meet specifi ed performance from –40°C to 85°C but is not tested or
QA sampled at these temperatures. The LTC6405I is guaranteed to meet
specifi ed performance from –40°C to 85°C.
Note 6: Input bias current is defi ned as the average of the input currents
fl owing into the inputs (–IN, and +IN). Input Offset current is defi ned as
the difference between the input currents (I
Note 7: Input common mode range is tested using the test circuit of Figure
1 by taking 3 measurements of differential gain with a ±1VDC differential
output with V
gain has not deviated from the V
that the common mode offset (V
mode offset at V
The voltage range for the output common mode range is tested using the
test circuit of Figure 1 by applying a voltage on the V
both V
that the common mode offset (V
±20mV from the V
OCM
= 2.5V and at the Electrical Characteristics table limits to verify
ICM
ICM
= 0V; V
OCM
= 2.5V by more than ±35mV.
= 2.5V case.
ICM
= 2.5V; V
OCM
ICM
OSCM
OSCM
, SHDN and V
= 2.5V case by more than 0.5%, and
ICM
) has not deviated from the common
) has not deviated by more than
= 5V, verifying that the differential
OS
= I
TIP
B
+
) are protected by
– I
OCM
B
–
).
pin and testing at
Note 8: Input CMRR is defi ned as the ratio of the change in the input
common mode voltage at the pins +IN or –IN to the change in differential
input referred voltage offset. Output CMRR is defi ned as the ratio of
the change in the voltage at the V
input referred voltage offset. This specifi cation is strongly dependent on
feedback ratio matching between the two outputs and their respective
inputs, and it is diffi cult to measure actual amplifi er performance. (See
the “Effects of Resistor Pair Mismatch” in the Applications Information
section of this data sheet.) For a better indicator of actual amplifi er
performance independent of feedback component matching, refer to the
PSRR specifi cation.
Note 9: Differential Power Supply Rejection (PSRR) is defi ned as the
ratio of the change in supply voltage to the change in differential input
referred voltage offset. Common mode power supply rejection (PSRRCM)
is defi ned as the ratio of the change in supply voltage to the change in the
common mode offset, V
Note 10: Extended operation with the output shorted may cause the
junction temperature to exceed the 150°C limit.
Note 11: Because the LTC6405 is a feedback amplifi er with low output
impedance, a resistive load is not required when driving an ADC.
Therefore, typical output power can be very small in many applications. In
order to compare the LTC6405 with “RF style” amplifi ers that require 50Ω
load, the output voltage swing is converted to dBm as if the outputs were
driving a 50Ω load. For example, 2V
using this convention.
Note 12: Includes offset/drift induced by feedback resistors mismatch. See
the Applications Information section for more details.
Note 13: QFN package only—refer to datasheet curves for MSOP package
numbers.
OUTCM
– V
OCM
OCM
P-P
pin to the change in differential
.
output swing is equal to 10dBm
LTC6405
6405fa
5