LT6604-2.5 datasheet(9/16 Pages) LINER

Part #	LT6604-2.5

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

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LT6604-2.5

9

660425f

–

+

1580Ω

0.01μF

0.1μF

3.3V

–

+

VIN

–

VIN

+

660425 F01

VOUT

+

VOUT

–

V

t

3

2

1

VIN

+

VIN

–

V

t

3

2

1

VOUT

+

1/2

LT6604-2.5

VOUT

–

0

25

27

4

34

6

2

29

7

–

+

1580Ω

0.01μF

0.1μF

3.3V

–

+

VIN

+

660425 F02

VOUT

+

VOUT

–

V

3

2

1

t

0

VOUT

+

VOUT

–

2

V

t

1

0

–1

VIN

+

25

27

4

34

6

2

29

7

1/2

LT6604-2.5

–

+

402Ω

0.1μF

0.01μF

5V

–

+

VIN

–

VIN

+

25

27

4

34

6

2

29

7

660425 F03

VOUT

+

VOUT

–

+

– 2V

V

t

3

2

1

0

VOUT

+

VOUT

–

V

t

3

2

1

0

VIN

+

VIN

–

500mVP-P (DIFF)

1/2

LT6604-2.5

APPLICATIONS INFORMATION

Figure 1

Figure 2

Figure 3

Interfacing to the LT6604-2.5

Note: The LT6604-2.5 contains two identical lowpass

ﬁlters. The following applications information only refers

to one ﬁlter. The two ﬁlters are independent except that

they share the same negative supply voltage V–. The two

ﬁlters can be used simultaneously by replicating the ex-

ample circuits. The referenced pin numbers correspond

to the A channel ﬁlter.

Each LT6604-2.5 channel requires two equal external re-

sistors, RIN, to set the differential gain to 1580Ω/RIN. The

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

to these external components, Figure 1. The difference

between VIN+ and VIN– is the differential input voltage. The

average of VIN+andVIN–isthecommonmodeinputvoltage.

Similarly, the voltages VOUT+ and VOUT– appearing at pins

27 and 29 of the LT6604-2.5 are the ﬁlter outputs. The dif-

ference 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 LT6604-2.5

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 for frequencies below

2.5MHz. The common mode 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.

Figure 2 shows how to AC couple signals into the LT6604-

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

AC-coupling 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 proportion-

ally reduce this highpass 3dB frequency.

In Figure 3 the LT6604-2.5 channel is providing 12dB of

gain. The common mode output voltage is set to 2V.

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