11

LT1790

1790fa

Line Regulation

Output Impedance vs Frequency

Power Supply Rejection Ratio

vs Frequency

INPUT VOLTAGE (V)

0

1.255

1.265

1.275

1.285

16

17901.25. G07

1.245

1.235

1.250

1.260

1.270

1.280

1.240

1.230

1.225

4

8

12

218

6

10

14

20

FREQUENCY (Hz)

–60

0

10

–70

–80

–10

–40

–20

–30

–50

100

10k

100k

1M

17901.25 G08

–90

1k

FREQUENCY (Hz)

1

10

100

100

10k

100k

17901.25 G09

0

1k

500

1.25V TYPICAL PERFOR A CE CHARACTERISTICS

Each of the voltage options have similar performance curves. For the 3V, 3.3V and the 4.096V options,

the curves can be estimated based on the 2.5V and 5V curves.

– 1.25V Characteristics

Long-Term Drift

(Data Points Reduced After 500 Hr)

Output Noise 0.1Hz to 10Hz

Output Voltage Noise Spectrum

OUTPUT TO GROUND VOLTAGE (V)

0

0.10

0.20

0.30

0.05

0.15

0.25

–2.0

–1.5

–1.0

–0.5

17091.25 G10

0

–2.5

3V

5k

4

2

1

6

1

µF

LT1790-1.25

R1 10k

HOURS

0

60

100

140

800

17901.25 G10

20

–20

40

80

120

0

–40

–60

200

400

600

1000

LT1790S6-1.25V

2 TYPICAL PARTS SOLDERED TO PCB

TIME (SEC)

0

8

17901.2 G12

246

10

7

135

9

FREQUENCY (Hz)

10

2.0

2.5

3.0

3.5

4.0

100

1k

10k

17901.25 G13

1.5

1.0

0.5

0

4.5

5.0

Integrated Noise 10Hz to 1kHz

FREQUENCY (Hz)

10

1

10

100

100

1000

LT1790 G01