7

LT1169

CC

HARA TERISTICS

A

TYPICALPERFOR

CE

CCIF IMD Test (Equal Amplitude

Tones at 13kHz, 14kHz)*

0.02

0.0001

0.01

1

0.1

1

10

30

LT1169 • TPC26

0.001

0.1

THD and Noise vs Output

Amplitude for Noninverting Gain

0.3

0.0001

0.01

1

110

30

LT1169 • TPC25

0.001

0.1

MEASUREMENT BANDWIDTH

= 10Hz TO 22kHz

NOISE FLOOR

THD and Noise vs Output

Amplitude for Inverting Gain

0.3

0.0001

0.01

1

110

30

LT1169 • TPC24

0.001

0.1

MEASUREMENT BANDWIDTH

= 10Hz TO 22kHz

NOISE FLOOR

FREQUENCY (Hz)

20

0.0001

0.01

1

100

1k

10k 20k

LT1169 • TPC23

0.001

0.1

MEASUREMENT BANDWIDTH

= 10Hz TO 80kHz

NOISE FLOOR

THD and Noise vs

Frequency for Inverting Gain

FREQUENCY (Hz)

20

0.0001

0.01

1

100

1k

10k 20k

LT1169 • TPC22

0.001

0.1

MEASUREMENT BANDWIDTH

= 10Hz TO 80kHz

NOISE FLOOR

THD and Noise vs

Frequency for Noninverting Gain

* SEE LT1115 DATA SHEET FOR DEFINITION OF

CCIF TESTING

S

APPLICATI

I FOR ATIO

LT1169 vs the Competition

With improved noise performance, the LT1169 dual in the

plastic DIP directly replaces such JFET op amps as the

OPA2111, OPA2604, OP215, and the AD822. The combi-

nation of low current and voltage noise of the LT1169

allows it to surpass most dual and single JFET op amps.

The LT1169 can replace many of the lowest noise bipolar

amps that are used in amplifying low level signals from

high impedance transducers. The best bipolar op amps

will eventually lose out to the LT1169 when transducer

impedance increases due to higher current noise.

Ω) assures that

the input bias current is almost constant over the entire

common mode range. Figure 1 shows how the LT1169

stands up to the competition. Unlike the competition, as the

input voltage is swept across the entire common mode

range the input bias current of the LT1169 hardly changes.

As a result the current noise does not degrade. This makes

the LT1169 the best choice in applications where an

amplifier has to buffer signals from a high impedance

transducer.