5.9 Typical Characteristics: VCC = 3.3V

at TA = 25°C, VCC = 3.3V, CF = 1nF, RF = 30kΩ (slope = 30mV/dB) and Ref_Res = 1% 56kΩ, and 10nF capacitor to AGND

on Log_Inp and Log_Inm, (unless otherwise noted). For AFE, 2nd-order BPF centered around frequency "f" with gain = -7dB

used between LNA and Log Detector block.

Log_Inp (VP)

0

0.5

1

1.5

2

2.5

3

3.5

0.060.08

0.1

1



10



100



1m

10m

100m

1

1



10



100



1m

10m

100m

1

f = 40kHz

f = 1MHz

f = 16MHz

f = 20MHz

f = 40MHz

Figure 5-34. Log Detector output at Various Frequencies

Log_Inp (VP)

-6

-5

-4

-3

-2

-1

0

1

2

10



100



1m

10m

100m

1

f = 40kHz

f = 1MHz

f = 16MHz

f = 20MHz

f = 40MHz

Figure 5-35. Log Detector Conformance Error for Different

Frequencies

Log_Inp (VP)

0

0.5

1

1.5

2

2.5

3

1



10



100



1m

10m

100m

f = 40kHz

f = 1MHz

f = 20MHz

Figure 5-36. AFE output at Various Frequencies

Log_Inp (VP)

-6

-5

-4

-3

-2

-1

0

1

2

3

4

5

6

1



10



100



1m

10m

100m

f = 40kHz

f = 1MHz

f = 20MHz

Figure 5-37. AFE Log Conformance Error for Different

Frequencies

Supply (VCC)

3

3.25

3.5

3.75

4

4.25

4.5

4.75

5

5.25

28

29

30

31

32

Ref_Res = 56k



Ref_Res = Open

RF = 30kΩ, f = 1MHz

Figure 5-38. Log Detector Slope Variation vs Supply

Time (250ns/div)

-3

-2

-1

0

1

2

3

LNA_In

 11

LNA_Out

Figure 5-39. LNA Overdrive Recovery

LOG300

SLOSEB7A – SEPTEMBER 2024 – REVISED OCTOBER 2024

www.ti.com

16

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