LTC6401-8 datasheet(5/16 Pages) LINEAR

Part #	LTC6401-8

Description	2GHz Low Noise, Low Distortion Differential ADC Driver for DC-140MHz

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Manufacturer	LINEAR [Linear Integrated Systems]

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LTC6401-14

5

640114f

AC ELECTRICAL CHARACTERISTICS

TYPICAL PERFORMANCE CHARACTERISTICS

Frequency Response

Gain 0.1dB Flatness

S21 Phase and Group Delay vs

Frequency

SYMBOL

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

140MHz Input Signal

HD2,140M/

HD3,140M

Second/Third Order Harmonic Distortion VOUT = 2VP-P, RL = 200Ω

–79/–57

dBc

VOUT = 2VP-P, No RL

–87/–69

dBc

IMD3,140M

Third-Order Intermodulation

(f1 = 139.5MHz f2 = 140.5MHz)

VOUT = 2VP-P Composite, RL = 200Ω

–70

dBc

VOUT = 2VP-P Composite, No RL

–81

dBc

OIP3,140M

Equivalent Third-Order Output Intercept

Point (f1 = 139.5MHz f2 = 140.5MHz)

VOUT = 2VP-P Composite, No RL (Note 7)

44.5

dBm

P1dB,140M

1dB Compression Point

RL = 375Ω (Notes 5, 7)

17.7

dBm

NF140M

Noise Figure

RL = 375Ω (Note 5)

7.4

dB

eIN,140M

Input Referred Voltage Noise Density

Includes Resistors (Short Inputs)

2.5

nV/√⎯H⎯z

eON,140M

Output Referred Voltage Noise Density

Includes Resistors (Short Inputs)

12.5

nV/√⎯H⎯z

IMD3,130M/150M

Third-Order Intermodulation

(f1 = 130MHz f2 = 150MHz) Measure at

170MHz

VOUT = 2VP-P Composite, RL = 375Ω

–70

–61

dBc

Speciﬁcations are at TA = 25°C. V+ = 3V, V– = 0V, VOCM = 1.25V,

⎯E⎯N⎯A⎯B⎯L⎯E = 0V, No RL unless otherwise noted.

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) are protected by steering diodes to either

supply. If the inputs go beyond either supply rail, the input current should

be limited to less than 10mA.

Note 3: The LTC6401C and LTC6401I are guaranteed functional over the

operating temperature range of –40°C to 85°C.

Note 4: The LTC6401C is guaranteed to meet speciﬁed performance from

0°C to 70°C. It 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 LTC6401I is guaranteed to meet speciﬁed performance

from –40°C to 85°C.

Note 5: Input and output baluns used. See Test Circuit A.

Note 6: Measured using Test Circuit B. RL = 87.5Ω per output.

Note 7: Since the LTC6401-14 is a feedback ampliﬁer with low output

impedance, a resistive load is not required when driving an AD converter.

Therefore, typical output power is very small. In order to compare the

LTC6401-14 with ampliﬁers that require 50Ω output load, the LTC6401-14

output voltage swing driving a given RL is converted to OIP3 and P1dB as

if it were driving a 50Ω load. Using this modiﬁed convention, 2VP-P is by

deﬁnition equal to 10dBm, regardless of actual RL.

FREQUENCY (MHz)

0

–50

–100

–150

–200

0.8

0.6

0.4

0.2

0

200

400

600

800

1000

640114 G03

PHASE

GROUP DELAY

TEST CIRCUIT B

FREQUENCY (MHz)

10

100

1000

3000

20

18

16

14

10

8

6

4

2

0

12

640114 G01

TEST CIRCUIT B

FREQUENCY (MHz)

10

100

1000

3000

1.0

0.8

–0.8

0.6

–0.6

0.4

–0.4

0.2

–0.2

0

–1.0

640114 G02

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