AKD4589 datasheet(7/51 Pages) AKM

Part #	AKD4589

Description	AK4589 Evaluation Board Rev.2

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Manufacturer	AKM [Asahi Kasei Microsystems]

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7 / 51 page

ASAHI KASEI

[AKD4589-B]

2005/07

- 7 -

PORT4

BUCV

1

2

9

10

UOUT

VOUT

VIN

GND

BOUT

COUT

B, U, C, V output and V input

B, U, C, V output and V input is used PORT4 (BUCV).

PORT4 pin order is showed Figure 6.

Figure 6. PORT4 pin order

Analog Inputs

BNC connector J10 (LIN),J9 (RIN) are used for analog inputs on the AKD4589-B. Analog inputs are single-ended

and input ranges of each channels are nominally 6.2Vpp@5V. (Input ranges of each channels of analog inputs of

AK4589 device are nominally 3.1Vpp@5V.But,for the resister division,the value which analog input level of

Evaluation Board is devided by two becomes to analog input level of AK4589 device on the AKD4589-B. So, input

ranges of AKD4589-B becomes to 6.2Vpp@5V,twice of the value in the case of AK4589 device. Input range of

AK4589 device is proportional to VREFH (3.1=0.62 x VREFH). VREFH is connected to AVDD on the

AKD4589-B.)

Analog Input Circuit

AK4589

Signal

22u

33

RIN

Same circuit

3.1Vpp

NJM4580

-

+

Op-amp circuit

32

LIN

6.2Vpp

330

Figure 7. Analog Input Circuit

1) Gain

Gain of analog input circuit is

330/(330+330) = -6.02dB.

Therefore input level for this board is

+0.80dBV(=3.1Vpp)+6.02dB

= +6.82dBV = 6.20Vpp = 2.19Vrms.

2) S/N of op-amp circuit (Theory: BW=20k+A)

Non-inverting amp is implemented on board. The output noise level of op-amp circuit is

-126.01dBV = -132.54dB (0dB=+6.53dBV).

S/N of ADC is

101.6dB (measurement).

Therefore total S/N of op-amp circuit and ADC is

101.60dB (measurement: 101.6dB)

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AKD4589 Datasheet(PDF) 7 Page - Asahi Kasei Microsystems

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