–16–

8-Lead Standard Small Outline Package [SOIC]

Narrow Body

(R-8)

Dimensions shown in millimeters and (inches)

0.25 (0.0098)

0.17 (0.0067)

1.27 (0.0500)

0.40 (0.0157)

0.50 (0.0196)

0.25 (0.0099)

45

8

0

1.75 (0.0688)

1.35 (0.0532)

SEATING

PLANE

0.25 (0.0098)

0.10 (0.0040)

85

4

1

5.00 (0.1968)

4.80 (0.1890)

4.00 (0.1574)

3.80 (0.1497)

1.27 (0.0500)

BSC

6.20 (0.2440)

5.80 (0.2284)

0.51 (0.0201)

0.31 (0.0122)

COPLANARITY

0.10

CONTROLLING DIMENSIONS ARE IN MILLIMETERS; INCH DIMENSIONS

(IN PARENTHESES) ARE ROUNDED-OFF MILLIMETER EQUIVALENTS FOR

REFERENCE ONLY AND ARE NOT APPROPRIATE FOR USE IN DESIGN

COMPLIANT TO JEDEC STANDARDS MS-012AA

OUTLINE DIMENSIONS

AD7898 to MC68HC16 Interface

The Serial Peripheral Interface (SPI) on the MC68HC16 is

configured for Master Mode (MSTR = 1), Clock Polarity Bit

(CPOL) = 1 and the Clock Phase Bit (CPHA) = 0. The SPI is

configured by writing to the SPI Control Register (SPCR) (see

68HC16 user manual). The serial transfer will take place as a

16-bit operation when the SIZE bit in the SPCR register is set

to SIZE = 1. To implement the power-down modes with an

8-bit transfer set SIZE = 0. A connection diagram is shown in

ply voltage as that of the MC68HC16. This allows the ADC

to operate at a higher voltage than the serial interface, i.e.,

MC68HC16, if necessary.

AD7898*

MC68HC16*

SCLK/PMC2

MISO/PMC0

SS/PMC3

*ADDITIONAL PINS OMITTED FOR CLARITY

CS

SCLK

SDATA

Figure 20. AD7898 to MC68HC16 Interface

AD7898

REV. A

Revision History

Location

Page

3/04—Data Sheet changed from REV. 0 to REV. A.

Added Patent Note . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

Changes to ORDERING GUIDE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

Updated OUTLINE DIMENSIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16