CX74063-3X datasheet(14/62 Pages) SKYWORKS

Part #	CX74063-3X

Description	RF Transceiver with Power Ramping Controller and Integrated Crystal Oscillator with 13 MHz Output for Multi-Band GSM, GPRS, and EDGE Applications

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Manufacturer	SKYWORKS [Skyworks Solutions Inc.]

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Data Sheet I CX74063-34/-35/-36

14

Skyworks Solutions, Inc., Proprietary and Confidential

NOVEMBER 25, 2003

[781] 376-3000 I FAX [781] 376-3100 I SALES@SKYWORKSINC.COM I WWW.SKYWORKSINC.COM

103116C

from baseband

Coupler

VCC2

Power Detector

PAVAPC

(pin 16)

PDETVCC

(pin 5)

BBVAPC (pin 17)

PDET

(pin 12)

Register 4

Rx/Tx Control Register

(bit 21), PDETVCC

TXENA (pin 2)

PAC Delay

Timer

5 pF

0 = 0.5 V

1 = 1.0 V

PA

8

C1338a

Bias

Generator

10 k

Ω

+

–

1

Figure 8. PA Controller Block Diagram

Power Amplifier Gain Controller

The device contains an error amplifier/integrator to provide

transmit burst control for an external power amplifier (PA). As

shown in Figure 8, when the device is connected to a PA, an

RF detector, and a coupler, a loop is formed that controls the

transmit power in a multi-band wireless application. The error

amplifier amplifies and integrates the voltage difference

between the RF detector output (PDET) and the power control

input (BBVAPC). The output of the integrator is fed to an

internal gain shaper that drives the gain control input (PAVAPC)

of the external RF PA. The device. provides a bandgap voltage

(PDETVCC) which can be used as the supply voltage for the

external peak detector and can source up to 200

µA.

The PA pre-bias is activated after a programmable delay and

time-referenced from the rising edge of TXENA. The time delay

is set using the serial interface. See Table 19 for details.

Digital Interface

The transceiver and synthesizer are controlled by a single

three-wire serial interface. The transmitter, receiver, and

synthesizer are each enabled through external inputs

according to typical timing requirements as shown in Figures

10 and 11.

Band selection for the CX74063-3x is through the three-wire

serial interface. The PCO signal (pin 3) provides a band

selection control output. DC offset calibration and front-end

activation timing can also be controlled by an on-chip signal

sequencer, precluding the need for separate control signals. All

the logic and the three-wire interface inputs are referenced to

the PCO signal (pin 3).

The RX/TX Control Register is used to program the transceiver

and to preset other test word states by setting bit 22 as a

logic 1. If any test words are to be altered from their preset

states, bit 22 must be sent to the RX/TX Control Register again

as a logic 0. Typically, this is done only on power-up since the

device has a zero-power standby mode that retains

programmed test memory.

There are eight additional registers used to program various

functions of the CX74063-3x. The SX1 Control Register is used

to program the fractional-N synthesizer and the SX2

Fractional-N Modulo Register is used to program the modulus.

Four auxiliary registers are used to program the transceiver

besides the RX/TX Control Register, and two 24-bit registers

are used to program the synthesizer:

• SX1 Synthesizer Control

• SX2 Fractional-N Modulo

• RX/TX Control

• R0 Auxiliary Control

• R2 DC Offset Timing

• R3 IP2 Calibration

• R4 PAC Timing Control

• R6 VCXO Control

• R7 VCXO Control

SX1 Control Register. This register is used to program the

fractional-N synthesizer, and set the values of the integral-N

divider and the input-R divider. The polarity of the

Phase/Frequency Detector (PFD) may also be defined by this

register. Refer to Table 13.

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CX74063-3X Datasheet(PDF) 14 Page - Skyworks Solutions Inc.

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