MP7652 데이터 시트보기 (PDF) - Exar Corporation

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MP7652

4-Channel Voltage Output 15 MHz, Input Bandwidth, 8-Bit Multiplying DACs with 3-Wire Serial Digital Port and Independent References

Exar Corporation 

MP7652

Inputs

PRESET SDI CLK

0

X

X

1

Data In 0→1

1

X

X

1

X

X

1

X

X

1

X

X

1

X

X

1

X

X

1

X

X

1

X

X

LD

X

1

0

0→1

0

0→1

0

0→1

0

0→1

Internal

Address

A1 A0

Output

SDO

Operation

XX

XX

00

00

01

01

10

10

11

11

X

Last bit

of shift reg.

Hi-Z

Last bit

of shift reg.

Hi-Z

Last bit

of shift reg.

Hi-Z

Last bit

of shift reg.

Hi-Z

Last bit

of shift reg.

Preset all DACs to

1/2 (VREFP + VREFN)

Shift data in and out

DAC 1 Transparent

DAC 1 Latched

DAC 2 Transparent

DAC 2 Latched

DAC 3 Transparent

DAC 3 Latched

DAC 4 Transparent

DAC 4 Latched

Table 1. Digital Function Truth Table

Serial In/Serial Out

D7 D6 D5 D4 D3 D2 D1 D0 DAC Output Voltage

MSB

LSB

VOUTi

= VREFNi + (VREFPi – VREFNi ) (

D

256

)

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

1

VREFN

(VREFP – VREFN) (

1

256

)

+

VREFN

1

1

1

1

1

1

1

0

1

1

1

1

1

1

1

1

(VREFP – VREFN) (

254

256

)

+

VREFN

(VREFP – VREFN) (

255

256

)

+

VREFN

Table 2. DAC Transfer Function

Analog Output vs. Digital Code

Rev. 1.00

8

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