LT6600IS8-2.5-PBF datasheet(9/16 Pages) LINER

Part #	LT6600IS8-2.5-PBF

Description	Very Low Noise, Differential Amplifi er and 2.5MHz Lowpass Filter

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LT6600-2.5

9

660025fb

APPLICATIONS INFORMATION

Figure 1. (S8 Pin Numbers)

Interfacing to the LT6600-2.5

Note: The referenced pin numbers correspond to the S8

package. See the Pin Functions for the equivalent DFN-12

package pin numbers.

The LT6600-2.5 requires two equal external resistors, RIN,

to set the differential gain to 1580Ω/RIN. The inputs to the

ﬁlter are the voltages VIN+ and VIN– presented to the see

external components, Figure 1. The difference between

VIN+ and VIN– is the differential input voltage. The aver-

age of VIN+ and VIN– is the common mode input voltage.

Similarly, the voltages VOUT+ and VOUT– appearing at Pins 4

and 5 of the LT6600-2.5 are the ﬁlter outputs. The differ-

ence between VOUT+ and VOUT– is the differential output

voltage. The average of VOUT+ and VOUT– is the common

mode output voltage.

Figure 1 illustrates the LT6600-2.5 operating with a single

3.3V supply and unity passband gain; the input signal is

DC coupled. The common mode input voltage is 0.5V, and

the differential input voltage is 2VP-P. The common mode

output voltage is 1.65V, and the differential output voltage

is 2VP-P forfrequenciesbelow2.5MHz.Thecommonmode

output voltage is determined by the voltage at VOCM. Since

VOCM is shorted to VMID, the output common mode is the

mid-supply voltage. In addition, the common mode input

voltage can be equal to the mid-supply voltage of VMID.

Figure2showshowtoACcouplesignalsintotheLT6600-2.5.

In this instance, the input is a single-ended signal. AC cou-

pling allows the processing of single-ended or differential

signals with arbitrary common mode levels. The 0.1μF

coupling capacitor and the 1580Ω gain setting resistor

form a high pass ﬁlter, attenuating signals below 1kHz.

Larger values of coupling capacitors will proportionally

reduce this highpass 3dB frequency.

In Figure 3 the LT6600-2.5 is providing 12dB of gain. The

common mode output voltage is set to 2V.

Figure 2. (S8 Pin Numbers)

Figure 3. (S8 Pin Numbers)

–

+

1580Ω

0.01μF

0.1μF

3.3V

–

+

VIN

–

VIN

+

3

4

1

7

2

8

5

6

660025 F01

VOUT

+

VOUT

–

V

t

3

2

1

VIN

+

VIN

–

V

t

3

2

1

VOUT

+

LT6600-2.5

VOUT

–

0

–

+

1580Ω

0.01μF

0.1μF

3.3V

–

+

VIN

+

3

4

1

7

2

8

5

6

660025 F02

VOUT

+

VOUT

–

V

3

2

1

t

0

LT6600-2.5

VOUT

+

VOUT

–

2

V

t

1

0

–1

VIN

+

–

+

402Ω

0.1μF

0.01μF

5V

–

+

VIN

–

VIN

+

3

4

1

7

2

8

5

6

660025 F03

VOUT

+

VOUT

–

+

– 2V

V

t

3

2

1

0

VOUT

+

VOUT

–

LT6600-2.5

V

t

3

2

1

0

VIN

+

VIN

–

500mVP-P (DIFF)

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