8

LTC1565-31

Output Drive

Pin 7 and Pin 8 can drive a 1k

Ω or 300pF load connected

to AC ground with a

±0.5V signal (corresponding to a

connected from Pin 7 to Pin 8) the outputs can produce

smaller signal amplitudes the outputs can drive corre-

spondingly larger loads.

Noise

The wideband noise of the filter is the RMS value of the

device’s output noise spectral density. The wideband

noise data is used to determine the operating signal-to-

noise at a given distortion level. Most of the noise is

concentrated in the filter passband and cannot be removed

with post filtering (Table 1). Table 2 lists the typical change

in wideband noise with supply voltage.

Table 1. Wideband Noise vs Bandwidth, Single 5V Supply

BANDWIDTH

TOTAL INTEGRATED NOISE

104

118

TOTAL INTEGRATED NOISE

POWER SUPPLY

5V

118

±5V

120

TYPICAL APPLICATIO S

+

–

A1

LT

4

6

0.1

µF

10

µF

2.49k

7

5V

2

3

4.99k

4.99k

A3

LT1809

4

6

0.1

µF

2.49k

7

5V

2

3

4.99k

4.99k

A2

LT1809

4

6

0.1

µF

0.1

µF

0.1

µF

5V

+IN

–IN

GND

+OUT

–OUT

LTC1565-31

SHDN

1

2

3

4

8

7

6

5

10

µF

4.99k

2.49k

7

5V

2

3

4.99k

2.49k

A4

LT1809

4

6

0.1

µF

(SINGLE ENDED)

2.49k

2.49k

7

5V

2

3

4.99k

4.99k

A5

LT1812

4

6

0.1

µF

0.1

µF

2.2

µF

19k

0.01

µF

7

2

3

1k

5V

20

Ω

1k

AMPLIFIERS A1, A2 AND A3 ALLOW THE USE OF A GROUND-

REFERENCED SINGLE-ENDED AC SOURCE AS THE INPUT

SIGNAL AND A SEPARATE GROUND-REFERENCED DC SOURCE

TO PROVIDE THE INPUT DC COMMON MODE VOLTAGE

AMPLIFIERS A4 AND A5 ALLOW MONITORING/MEASURING

THE DIFFERENTIAL OUTPUT WITH A SINGLE-ENDED, GROUND-

REFERENCED INSTRUMENT

1565-31 TA08

Test Circuit for Single 5V Supply Operation