LTC6405IMS8E-TRPBF datasheet(5/24 Pages) LINER

Part #	LTC6405IMS8E-TRPBF

Description	2.7GHz, 5V, Low Noise, Rail-to-Rail Input Differential Amplifi er/Driver

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Manufacturer	LINER [Linear Technology]

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LTC6405

5

6405fa

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, VOCM, SHDN and VTIP) are protected by

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

indeﬁnitely.

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 speciﬁed performance from

0°C to 70°C. The LTC6405C is designed, characterized, and expected

to meet speciﬁed performance from –40°C to 85°C but is not tested or

QA sampled at these temperatures. The LTC6405I is guaranteed to meet

speciﬁed performance from –40°C to 85°C.

Note 6: Input bias current is deﬁned as the average of the input currents

ﬂowing into the inputs (–IN, and +IN). Input Offset current is deﬁned as

the difference between the input currents (IOS = IB+ – IB–).

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 VICM = 0V; VICM = 2.5V; VICM = 5V, verifying that the differential

gain has not deviated from the VICM = 2.5V case by more than 0.5%, and

that the common mode offset (VOSCM) has not deviated from the common

mode offset at VICM = 2.5V by more than ±35mV.

The voltage range for the output common mode range is tested using the

test circuit of Figure 1 by applying a voltage on the VOCM pin and testing at

both VOCM = 2.5V and at the Electrical Characteristics table limits to verify

that the common mode offset (VOSCM) has not deviated by more than

±20mV from the VOCM = 2.5V case.

Note 8: Input CMRR is deﬁned 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 deﬁned as the ratio of

the change in the voltage at the VOCM pin to the change in differential

input referred voltage offset. This speciﬁcation is strongly dependent on

feedback ratio matching between the two outputs and their respective

inputs, and it is difﬁcult to measure actual ampliﬁer performance. (See

the “Effects of Resistor Pair Mismatch” in the Applications Information

section of this data sheet.) For a better indicator of actual ampliﬁer

performance independent of feedback component matching, refer to the

PSRR speciﬁcation.

Note 9: Differential Power Supply Rejection (PSRR) is deﬁned 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 deﬁned as the ratio of the change in supply voltage to the change in the

common mode offset, VOUTCM – VOCM.

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 ampliﬁer 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” ampliﬁers that require 50Ω

load, the output voltage swing is converted to dBm as if the outputs were

driving a 50Ω load. For example, 2VP-P output swing is equal to 10dBm

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.

ELECTRICAL CHARACTERISTICS

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