MP7651AS View Datasheet(PDF) - Exar Corporation

Part Name

Description

MFG CO.

MP7651AS

8-Channel, Voltage Output 10 MHz Input Bandwidth 8-Bit Multiplying DACs with Serial Digital Data Port and Chip Select Decoder

Exar Corporation 

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MP7651

8085

ALE

WR

8

8

ADDRESS BUS

3

8212

+5 V

E1 A0 to A2

E3 74LS138

ADDRESS

E2 DECODER

8

DATA BUS

SOD

LD CLK CS0P to CS3P

SDI

MP7651

NOTES:

1. Clock generated by WR and decoding address 8000

RST

FROM SYSTEM RESET

2. Data is clocked into the DAC shift register by executing memory write instructions. The clock input is

generated by decoding address 8000 and WR. Data is then loaded into the DAC register with a memory

write instruction to address 4000.

3. Serial data must be present in the right justified format in registers H & L of the microprocessor.

Figure 10. 8085 Interface (Simplified Diagram)

MP7651 EVALUATION BOARD

1.6 Vp–p

DUT

VR0 VO0

VR1 VO1

VR2 VO2

VR3 VO3

VR4 VO4

VR5 VO5

VR6 VO6

VR7 VO7

N/C

SDI

SDO

CLK

LD

RST

N/C

DGND

MP7651

Measurement

Buffer

5 pF

1k

Test Load

20 pF 5k

VOUT

All resistors = 50 Ω unless otherwise specified

Gain of all DACs set to 1 (no attenuation)

Rev. 2.00

Figure 1. Crosstalk Measurement Set-Up

12

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