ADF7020-1 datasheet(15/48 Pages) AD

Part #	ADF7020-1

Description	High Performance FSK/ASK Transceiver IC

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ADF7020-1

Rev. 0 | Page 15 of 48

FREQUENCY SYNTHESIZER

REFERENCE INPUT

The on-board crystal oscillator circuitry (see Figure 19) can use

an inexpensive quartz crystal as the PLL reference. The oscil-

lator circuit is enabled by setting R1_DB12 high. It is enabled by

default on power-up and is disabled by bringing CE low. Errors

in the crystal can be corrected using the automatic frequency

control (see the AFC Section) feature or by adjusting the

fractional-N value (see the N Counter section). A single-ended

reference (TCXO, CXO) can also be used. The CMOS levels

should be applied to OSC2 with R1_DB12 set low.

OSC1

CP1

CP2

OSC2

Figure 19. Oscillator Circuit on the ADF7020-1

Two parallel resonant capacitors are required for oscillation at

the correct frequency; their values are dependent on the crystal

specification. They should be chosen so that the series value of

capacitance added to the PCB track capacitance adds up to the

load capacitance of the crystal, usually 20 pF. Track capacitance

values vary from 2 pF to 5 pF, depending on board layout.

Where possible, choose capacitors that have a very low

temperature coefficient to ensure stable frequency operation

over all conditions.

CLKOUT Divider and Buffer

The CLKOUT circuit takes the reference clock signal from the

oscillator section (see Figure 19) and supplies a divided-down

50:50 mark-space signal to the CLKOUT pin. An even divide

from 2 to 30 is available. This divide number is set in R1_DB

(8:11). On power-up, the CLKOUT defaults to the divide-by-8

block.

DVDD

CLKOUT

ENABLE BIT

CLKOUT

OSC1

DIVIDER

1 TO 15

÷2

Figure 20. CLKOUT Stage

To disable CLKOUT, set the divide number to 0. The output

buffer can drive up to a 20 pF load with a 10% rise time at

4.8 MHz. Faster edges can result in some spurious feedthrough

to the output. A small series resistor (50 Ω) can be used to slow

the clock edges to reduce these spurs at FCLK.

R Counter

The 3-bit R counter divides the reference input frequency by an

integer from 1 to 7. The divided-down signal is presented as the

reference clock to the phase frequency detector (PFD). The

divide ratio is set in Register 1. Maximizing the PFD frequency

reduces the N value. This reduces the noise multiplied at a rate

of 20 log(N) to the output, as well as reducing occurrences of

spurious components. The R Register defaults to R = 1 on

power-up:

PFD [Hz] = XTAL/R

MUXOUT and Lock Detect

The MUXOUT pin allows the user to access various digital

points in the ADF7020-1. The state of MUXOUT is controlled

by Bits R0_DB (29:31).

Regulator Ready

Regulator ready is the default setting on MUXOUT after the

transceiver has been powered up. The power-up time of the

regulator is typically 50 μs. Because the serial interface is

powered from the regulator, the regulator must be at its

nominal voltage before the ADF7020-1 can be programmed.

The status of the regulator can be monitored at MUXOUT.

When the regulator ready signal on MUXOUT is high,

programming of the ADF7020-1 can begin.

REGULATOR READY

DIGITAL LOCK DETECT

ANALOG LOCK DETECT

R COUNTER OUTPUT

N COUNTER OUTPUT

PLL TEST MODES

Σ-Δ TEST MODES

MUX

CONTROL

DGND

DVDD

MUXOUT

Figure 21. MUXOUT Circuit

Digital Lock Detect

Digital lock detect is active high. The lock detect circuit is

located at the PFD. When the phase error on five consecutive

cycles is less than 15 ns, lock detect is set high. Lock detect

remains high until 25 ns phase error is detected at the PFD.

Because no external components are needed for digital lock

detect, it is more widely used than analog lock detect.

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