NJW1201A

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5-4. Detective level in DBB

Detective level of input signal in DBB is control by I2C or external resistor (Rsense:pin.24).

In case of without external resistor, Detective level is shown in below Fig5-4-1, 5-4-2.

Fig5-4-1 is Output Voltage vs Input Voltage when detective level is changed (Gain setting = 3).

Fig5-4-2 is Output Voltage vs Input Voltage when Gain setting is changed (Sense level = 4).

These figures don’t include the external Resistor (Rsense:pin.24).

Regarding Detective Level (sense level), internal resistance is switched by I2C.

This resistance decides detective level.

1. Sense 1 = 36kΩ

2. Sense 2 = 9kΩ

3. Sense 3 = 5.2kΩ

4. Sense 4 = 3.6kΩ

And, if connect the external resistor (Rsense:pin.24), Detected level is shown in below equations.

1. Sense 1 = 36kΩ // Rsense

2. Sense 2 = 9kΩ // Rsense

3. Sense 3 = 5.2kΩ // Rsense

4. Sense 4 = 3.6kΩ // Rsense

Output vs Input Voltage (DBB SenseLevel sw eep)

V+=9V, DBB=GAIN3, Vin(A+Bch), f=70Hz

Vout=Ach, Ta=25oC

0.001

0.01

0.1

1

10

0.001

0.01

0.1

1

10

Input Voltage (Vrms)

Sense4

Sense3

Sense2

Sense1

Output vs Input Voltage (DBB GainLevel sw eep)

V+=9V, Sense=Sense4, Vin(A+Bch), f=70Hz

Vout=Ach, Ta=25oC

0.001

0.01

0.1

1

10

0.001

0.01

0.1

1

10

Input Voltage (Vrms)

Gain3

Gain2

Gain1