LT6600-15

1

660015fa

TYPICAL APPLICATION

DESCRIPTION

Very Low Noise, Differential

Amplifier and 15MHz Lowpass Filter

4th order 15MHz lowpass filter approximating a Chebyshev

frequency response. Most differential amplifiers require

many precision external components to tailor gain and

bandwidth. In contrast, with the LT6600-15, two external

resistors program differential gain, and the filter’s 15MHz

cutoff frequency and passband ripple are internally set.

The LT6600-15 also provides the necessary level shifting

to set its output common mode voltage to accommodate

the reference voltage requirements of A/Ds.

Using a proprietary internal architecture, the LT6600-15

integrates an antialiasing filter and a differential amplifier/

driver without compromising distortion or low noise perfor-

mance. At unity gain the measured in band signal-to-noise

ratio is an impressive 76dB. At higher gains the input

referred noise decreases so the part can process smaller

input differential signals without significantly degrading

the output signal-to-noise ratio.

The LT6600-15 also features low voltage operation. The

differential design provides outstanding performance for

3V supply.

The LT6600-15 is packaged in an SO-8 and is pin compat-

ible with stand alone differential amplifiers.

An 8192 Point FFT Spectrum

L, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.

All other trademarks are the property of their respective owners.

FEATURES

APPLICATIONS

Resistors

Cutoff

1MHz: 86dBc 2nd, 90dBc 3rd

10MHz: 63dBc 2nd, 69dBc 3rd

Pinouts

Networking or Cellular Base Station Applications

–

+

–

+

536Ω

536Ω

0.01μF

0.1μF

25Ω

25Ω

5.6pF

3V

3V

–

+

LT6600-15

LTC2249

3

4

1

7

2

8

5

6

660015 TA01a

2.2μF

5.6pF

5.6pF

FREQUENCY (MHz)

0

–60

–30

–20

40

660015 TA01b

–70

–80

–120

10

20

30

–100

0

–10

–40

–50

–90

–110

INPUT 10.7MHz