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AD6426

Enhanced GSM Processor

Analog Devices 

Preliminary Technical Information

Rx Timing Control

RXON

The signal at the output pin RXON is generated by the

function Receive Enable OR Monitor Enable of the RADIO

CONTROL CC Control Register 2. It can be used to enable

the RF receiver and controls the RXON-pin of the AD6425. In

radios based on the Siemens solution this signal would be

connected to the RXON1 input. Additional RXON derived

signals are provided to support this solution.

Bit RADIO CONTROL CC Control Register 2

2 Monitor Enable

1 Receive Enable

CALIBRATERADIO

The 4 modes of the Autocalibrate signal (Type 0 & 1, AutoCal

on/off) are provided as required by the ADI or Philips solution

and shown in Figure 8.

RXON

TYPE=0, AUTOCAL=0

RxEnable RxEnable

Start (early) Start (late)

AutoCalibrateEnd

RxEnableEnd

TYPE=0, AUTOCAL=1

TYPE=1, AUTOCAL=0

TYPE=1, AUTOCAL=1

Figure 8. Autocalibration

The flags Autocalibrate and Calibrate Radio in the SYSTEM

CC Control Register 0 are OR´ed and connected to the output

pin CALIBRATERADIO.

Bit the SYSTEM CC Control Register 0

7 Autocalibrate

Enables the autocalibrate function if set to 1;

3 Calibrate Radio

The type of autocalibration is set in the TRAFFIC MODE CC

Control Register 6

Bit TRAFFIC MODE CC Control Register 6

3 Autocalibration Type

In radios based on the Siemens chipset, this signal would

connect to the RXON2 input. The required behavior is enabled

by selecting the Type 1 CalibrateRadio function.

AD6426

Synthesizer Control

The radio interface of the AD6426 supports 2 dynamic

synthesizers, with each capable of downloading data on

demand.

The two Synthesizer Load Dynamic flags located in the

SYNTH CONTROL CC Control Register 38, will set the

synthesizer interface to load 3 consecutive long-words from

Layer 1.

Bit SYNTH CONTROL CC Control Register 38

7 Synthesizer Enable Polarity

Selects the polarity of the SYNTHEN outputs.

If set to 0, SYNTHEN is an active low signal,

if set to 1, SYNTHEN is an active high signal.

6 Synthesizer Enable Type

Selects the active period of the SYNTHEN outputs.

When set to 0, SYTHEN is active for all data values

determined by SYNTHESIZER BIT COUNT; when

set to 1, SYNTHEN goes active after the last bit for

one SYNTHCLK period.

2 Synthesizer Load Dynamic 1 (SLD1)

1 Synthesizer Load Dynamic 0 (SLD0)

When using the Configure Dynamic Synthesizer flag in the

SYNTH BIT COUNT CC Control Register 37, the download-

on-demand function is applied to the synthesizer selected by

SLD0 or SLD1.

Bit SYNTH BIT COUNT CC Control Register 37,

6 Configure Dynamic Synthesizer

Each dynamic synthesizer is comprised of three 32-bit word

registers, for the Rx, Tx and Monitor phases. The download

on demand uses the Rx register only for the respective

synthesizer.

Bit SYNTHESIZER 1 CC Control Register 40

7 : 0 Synthesizer (31:24)

Bit SYNTHESIZER 2 CC Control Register 41

7 : 0 Synthesizer (23:16)

Bit SYNTHESIZER 3 CC Control Register 42

7 : 0 Synthesizer (15:8)

Bit SYNTHESIZER 4 CC Control Register 43

7 : 0 Synthesizer (7:0)

This Information applies to a product under development. Its characteristics and specifications are subject to change without notice. Analog Devices assumes no

obligation regarding future manufacture unless otherwise agreed to in writing. No responsibility is assumed by Analog Devices for its use; nor for any

infringements of patents or other rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent or patent

rights of Analog Devices.

Revision Preliminary 2.3 (June 9, ´98)

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