Digitally Controlled Analog I/O Processor

5

MX839 PRELIMINARY INFORMATION

© 1998 MX

xCOM Inc.

www.mxcom.com Tele: 800 638-5577 336 744-5050

Fax: 336 744-5054

Doc. # 20480164.002

4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA

All trademarks and service marks are held by their respective companies.

3

External Components

DV

DD

AV

DD

DV

DD

AV

DD

V

SS

V

BIAS

MOD1 OUT

MOD1 IN

MOD2 OUT

MOD2 IN

IRQ

XTAL

SERIAL CLOCK

C-BUS

INTERFACE

COMMAND DATA

XTAL/CLOCK

MX839

C3

R3

REPLY DATA

CS

1

2

3

4

5

6

8

9

10

11

12

13

14

7

24

23

22

21

20

19

18

17

16

15

XTAL

DACOUT3

DACOUT2

DACOUT1

ADCIN1

ADCIN2

ADCIN3

ADCIN4

N/C

N/C

XTAL/CLOCK

C2

C1

X1

R1

C6

DV

DD

R2

C4

C5

Figure 2: Recommended External Components

R1

1M

:

±5%

C4

Note 1

0.1µF

±20%

R2

22k

:

±10%

C5

0.1µF

±20%

R3

Note 1

10

:

±10%

C6

Note 1

10.0µF

±20%

C1

22pF

±20%

C2

22pF

±20%

C3

0.1µF

±20%

X1

Note 2, 3

±100ppm

Table 1: Recommended External Components

Notes:

1.

These values should be determined in regard to the amount of supply filtering required for D/A outputs.

2.

If an external clock is to be used, then it should be connected to Pin 2 and the components C1, C2, R1, and X1

omitted. The ADC clock frequency is derived from the crystal or external clock by means of internal programmable

dividers. See Section 6 for details of crystal or external clock frequency range.

3.

For best results, a crystal oscillator design should drive the clock inverter input with signal levels of at least 40% of

assistance, consult your crystal manufacturer.