AD9853_15 datasheet(6/31 Pages) AD

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OBSOLETE

AD9853

–6–

REV. C

Table II. Control Register Functional Assignment

Address

DATA

(Note 1)

00h

MSB

Value of K (Message Length in Bytes) for Reed-Solomon Encoder, where 1610 ≤ K ≤ 25510 (Note 2)

LSB

01h

MSB

The Number of Correctable Byte

LSB

Randomizer

Randomizer Length

(Note 3)

Errors (t) for the Reed-Solomon

Insertion

002 = 6 Bit

Encoder, where 0

≤ t ≤ 10

10.012 = 15 Bit

For t = 0, the RS encoder is

0 = After RS

102 = Randomizer OFF

effectively disabled.

1 = Before RS

112 = Randomizer OFF

02h

MSB

Lower Eight Bits of Seed Value for 15-Bit Randomizer (Not Used for 6-Bit Randomizer)

LSB

03h

MSB

Upper Seven Bits of Seed Value for 15-Bit Randomizer

LSB

– OR –

Seed Value for 6-Bit Randomizer (D1 not used in this case).

04h

MSB

Preamble Length (L) where 0

≤ L ≤ 96 Bits (Note 4)

LSB

05h

Modulation Mode

0002 = QPSK , 0012 = DQPSK, 0102 = 16-QAM

0112 = D16-QAM , 1002 = FSK

06h

The MSB of the preamble always resides in D7 of Address 11h and is the first preamble bit to be clocked out of the device during transmission of

a packet. Up to 96 bits of preamble are available as specified in Register 04h. Unused bits are don’t care for L < 96.

11h

MSB

Preamble Data. (Note 5)

12h

MSB

Interpolator #1: RATE

LSB

Rate Change Factor (R) where 310 ≤ R ≤ 3110

13h

MSB

Interpolator #2: RATE

LSB

Rate Change Factor (R) where 210 ≤ R ≤ 6310

14h

MSB

Interpolator #1: SCALE

LSB

× Multiplier

0 = OFF

1 = ON

15h

MSB

Interpolator #2: SCALE

LSB

16h

Frequency Tuning Word #1

LSB

FSK Mode: Specifies the “space” frequency (F0).

19h

MSB

All Other Modes: Specifies the carrier frequency.

1Ah

Frequency Tuning Word #2

LSB

FSK Mode: Specifies the “mark” frequency (F1).

1Dh

MSB

(Addresses 1Ah–1Dh are only valid for FSK mode.)

1Eh

MSB-2

MSB-3

10-Bit FIR End Tap Coefficient, a0

LSB0

1Fh

MSB0

MSB-1

<— — — — — — — — — — — — — — Unused Bits — — — — — — — — — — — — — —>

FIR Intermediate Tap Coefficients, a1 – a19

46h

MSB-2

MSB-3

10-Bit FIR Center Tap Coefficient, a20

LSB20

47h

MSB20

MSB-1

<— — — — — — — — — — — — — — Unused Bits — — — — — — — — — — — — — —>

Spectrum

Digital Power

× RefClk

PLL Mode

DAC Mode

48h

0 = I

× Cos + Q × Sin

0 = Normal

0 = Off

0 = Awake

(Note 7)

1 = I

× Cos – Q × Sin

1 = Shutdown

1 = On

1 = Sleep

49h

AD8320 Cable Driver Gain Control Byte (GCB)

(Note 8)

MSB

The absolute gain, AV, of the AD8320 is given by: AV = 0.316 + 0.077 × GCB (where 0 ≤ GCB ≤ 25510)

LSB

NOTES

1The 8-bit Register Address is preceded by an 8-bit Device Address, which is given by

000001XY, where the value of Bits X and Y are determined as follows:

Voltage Applied to Pin 6

Desired Register Function

GND

WRITE

1+VS

READ

2This register must be loaded with a nonzero value even if the RS encoder has been

disabled by setting T = 0 in register 01h.

3Unused regions are don’t care bit locations.

4If a preamble is not used this register must be initialized to a value of 0 by the user.

5Addresses 06h–011h and 1Eh–47h are write only.

6Readback of register 15h results in a value that is 2

× the actual programmed value.

This is a design error in the readback function.

7Assertion of RESET (Pin 32) sets the contents of this register to 0.

8Registers 0h–48h may be written to using a single register address followed by a

contiguous data sequence (see Figure 27). Register 49h, however, must be written to

individually; i.e., a separately addressed 8-bit data sequence.

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