5.6 Typical Characteristics (continued)

at TA = 25°C, VS = 5V (±2.5V) to 10V (±5V), OUTA RL = 10kΩ connected to VS / 2, OUTB RL = 2kΩ connected to VS / 2,

VCM = VREFA = VS / 2, VREFGND = VS–, II1 = 1µA, and II2 = 1µA (unless otherwise noted)

I1 Input Current (µA)

0.01

0.1

1

10

100

1000

10000

-12

-6

0

6

12

18

24

30

36

42

48

TA = –40°C

TA = 25°C

TA = 50°C

TA = 85°C

TA = 125°C

Figure 5-19. Logarithmic-Amplifier Offset vs I1 Current

I2 Input Current (µA)

0.01

0.1

1

10

100

1000

-4

-3.5

-3

-2.5

-2

-1.5

-1

-0.5

0

0.5

1

TA = –40°C

TA = 25°C

TA = 50°C

TA = 85°C

TA = 125°C

Figure 5-20. Logarithmic-Amplifier Offset vs I2 Current

Time (200ns/div)

-10

-8

-6

-4

-2

0

2

4

6

8

10

12

14

V+IN

CL = 28pF

CL = 60pF

CL = 97pF

RISO = 0Ω, G = 1

Figure 5-21. Auxiliary-Amplifier Small-Signal Step Response

Time (200ns/div)

-10

-8

-6

-4

-2

0

2

4

6

8

10

12

14

V+IN

CL = 28pF

CL = 60pF

CL = 97pF

CL = 157pF

CL = 307pF

RISO = 25Ω, G = 1

Figure 5-22. Auxiliary-Amplifier Small-Signal Step Response

Time (500ns/div)

0.25

0.00

CIN = 1.8pF

CIN = 5.1pF

CIN = 10pF

CIN = 19.8pF

II1 1µA–10µA

Figure 5-23. Step Response for Various CIN

Time (500ns/div)

0.25

0.00

COUT = 28pF

COUT = 87pF

COUT = 157pF

COUT = 329pF

II1 1µA–100µA

Figure 5-24. Step Response for Various COUT

www.ti.com

LOG200

SBOSA28A – AUGUST 2023 – REVISED DECEMBER 2024

Copyright © 2024 Texas Instruments Incorporated

Submit Document Feedback

11

Product Folder Links: LOG200