AD6634BCSLASHPCB datasheet(52/52 Pages) AD

52 / 52 page

REV. 0

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AD6634

Internal Address = 0x087

// holding registers for NCO phase byte wide access data

int d1, d0;

// NCO frequency word (16-bits wide)

NCO_PHASE = 0xCBEF;

// write ACR

write_micro(7, 0x03 );

// write CAR

write_micro(6, 0x87);

// write DR1 with D[15:8]

d1 = (NCO_PHASE & 0xFF00) >> 8;

write_micro(1, d1);

// write DR0 with D[7:0]

// On this write all data is transferred to the internal address

d0 = NCO_FREQ & 0xFF;

write_micro(0, d0);

} // end of main

INTERNAL READ ACCESS

A read is performed by first writing the CAR and AMR as with

a write. The data registers (DR2–DR0) are then read in the

reverse order that they were written. First, the Least Significant

Byte of the data (D[7:0]) is read from DR0. On this transaction

the high bytes of the data are moved from the internal address

pointed to by the CAR and AMR into the remaining data registers

(DR2–DR1). This data can then be read from the data registers

using the appropriate 3-bit addresses. The number of data registers

used depends solely on the amount of data to be read or written.

Any unused bit in a data register should be masked out for a read.

Read Pseudocode

int read_micro(ext_address);

main();

{

* This code shows the reading of the first RCF coefficient

using the read_micro function as defined above. The variable

address is the External Address A[2..0].

Internal Address = 0x000

// holding registers for the coefficient

int d2, d1, d0;

// coefficient (20-bits wide)

long coefficient;

// write AMR

write_micro(7, 0x00 );

// write LAR

write_micro(6, 0x00);

* read D[7:0] from DR0. All data is moved from the Internal

Registers to the interface registers on this access.

d0 = read_micro(0) & 0xFF;

// read D[15:8] from DR1

d1 = read_micro(1) & 0xFF;

// read D[23:16] from DR2

d2 = read_micro(2) & 0x0F;

coefficient = d0 + (d1 << 8) + (d2 << 16);

} // end of main

OUTLINE DIMENSIONS

196-Lead Chip Scale Ball Grid Array [CSPBGA]

(BC-196)

Dimensions shown in millimeters

DETAIL A

1.70

MAX

SEATING PLANE

0.30 MIN

DETAIL A

0.70

0.60

0.50

BALL

DIAMETER

0.20

COPLANARITY

13.00 BSC

14 13 12 11 10 9 8 7 6 5 4 3 2 1

1.00 BSC

BALL PITCH

15.00 BSC SQ

TOP VIEW

BOTTOM VIEW

A1 CORNER

COMPLIANT TO JEDEC STANDARDS MO-192AAE-1

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