AD7898AR-3REEL7 Ver la hoja de datos (PDF) - Analog Devices
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AD7898AR-3REEL7 Datasheet PDF : 16 Pages
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AD7898
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
Figure 20. The VDRIVE pin of the AD7898 takes the same sup-
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*
SCLK
SDATA
CS
VDRIVE
MC68HC16*
SCLK/PMC2
MISO/PMC0
SS/PMC3
*ADDITIONAL PINS OMITTED FOR CLARITY
VDD
Figure 20. AD7898 to MC68HC16 Interface
OUTLINE DIMENSIONS
8-Lead Standard Small Outline Package [SOIC]
Narrow Body
(R-8)
Dimensions shown in millimeters and (inches)
5.00 (0.1968)
4.80 (0.1890)
8
4.00 (0.1574)
3.80 (0.1497) 1
5
6.20 (0.2440)
4 5.80 (0.2284)
0.25 (0.0098)
1.27 (0.0500)
BSC
1.75 (0.0688)
1.35 (0.0532)
0.50 (0.0196)
0.25 (0.0099) ؋ 45؇
0.10 (0.0040)
COPLANARITY
0.10
SEATING
PLANE
0.51 (0.0201)
0.31 (0.0122)
8؇
0.25 (0.0098) 0؇ 1.27 (0.0500)
0.17 (0.0067) 0.40 (0.0157)
COMPLIANT TO JEDEC STANDARDS MS-012AA
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
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
–16–
REV. A
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