F6923 Datasheet

R35DS0012EU0100

Rev.1.0

Jul 6, 2021

Page 6

3.

Typical Application Circuits

Figure 3 shows two typical application circuits for biasing the F6923.

The top circuit uses a voltage source Vref to supply the bias reference current IREF through an external resistor

Rref. Vref should be set to achieve the recommended IREF bias currents per the indicated formula. For the

typical relationship between Viref and IREF, see Figure 13.

The bottom circuit uses the programmable IDAC of the Renesas F61xx beamforming device to provide the

reference current directly to the F6923.

Figure 3. Typical Application Circuits

CH1

CH2

VDD2

VDD1

F6923

VDD

VDD

Vref

IREF

Rref

Viref

CH1

CH2

VDD2

VDD1

IREF

F6923

VDD

VDD

F61xx

IB

Bias

Gen

IDAC

Iref

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