Chips for digital frequency synthesizers KF1015PLZA, KF1015PLZB. Scheme, description

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Chips for digital frequency synthesizers KF1015PLZA, KF1015PLZB. Encyclopedia of radio electronics and electrical engineering

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Encyclopedia of radio electronics and electrical engineering / Application of microcircuits

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High-speed microcircuits KF1015PLZA and KF1015PLZB are designed to build modern digital frequency synthesizers with PLL for HF, VHF and decimeter wave bands. The devices are manufactured using CMOS technology with a polysilicon gate.

Microcircuits of the KF1015PLZ series are produced in a plastic 16-pin miniature package 4308.16-1 (Fig. 1). Weight of the device - no more than 0,3 g.

Chips for digital frequency synthesizers KF1015PLZA, KF1015PLZB
Ris.1

The microcircuit includes (see the block diagram in Fig. 2) a reference frequency generator, a reference frequency divider, an amplifier-shaper of input RF pulses, a binary frequency divider path with a programmable division ratio, consisting of a two-module preliminary frequency divider by 31 or 32, five-bit prescaler control counter, twelve senior digits of a programmable divider and a logic control unit, a frequency-phase detector and twenty-bit receiving and buffer registers.

Fig.2 (click to enlarge)

The microcircuit included in a typical circuit with attached components is capable of operating in digital synthesizers with a PLL of the meter and decimeter ranges with reduced power consumption.

Pinout of the microcircuit: pin. 1 - common for the receiving and buffer registers, the path of the programmable frequency divider and the frequency-phase detector, negative power output; pin. 2 - charging output of the frequency-phase detector (drain of a field-effect transistor with a p-channel); pin. 3 - bit output of a frequency-phase detector (drain of a field-effect transistor with an n-channel); pin. 4 - control output of indication of phase synchronization in the PLL loop; pin. 5 - RF input of the amplifier-shaper of the path of the programmable divider; pin. 6 - programmable divider output; pin. 7 - input permission to rewrite information from the receiving register to the buffer (T); pin. 8 - input of clock pulses for recording information (C); pin. 9 - positive power output; pin. 10 - input recording information about the division coefficients (D); pin. 11 - output for connecting a quartz resonator; exemplary frequency generator output; pin. 12 - output for connecting a quartz resonator; signal input of an external reference frequency generator; pin. 13 - input signal to turn off the output of the divider of the reference frequency (at level 1); pin. 14 - output of the reference frequency divider (at level 0 on pin 13) or input of the frequency-phase detector (at level 1 on pin 13); pin. 15 - common for the generator and the reference frequency divider, negative power output; pin. 16 - control output of the receiving register.

Main characteristics at Tacr.av=25±10°C and supply voltage 5 V

Rated supply voltage, V ............... .4,5...5,5
Programmable Frequency Divider Path Divider Limits ......992-131071
Programmable Divider Step .................................................. 1
Dividing ratios of the reference frequency divider ..................100,200 400,512, 640,800, 1000,1024
Programmable divider input frequency interval, MHz, for KF1015PLZA ........ .50...1000 KF1015PLZB ..........20...800
Reference frequency divider input frequency interval, MHz ..............................1 ...50
Sensitivity of the shaping amplifier, Veff, (lower value - for frequency within 50...500 MHz) ..............0,2...0,9
Sensitivity at the input of the reference frequency generator (for an external quartz oscillator), mVeff. .................100...150
Maximum current consumption, mA, no more ............... 15
Output impedance of the outputs of the frequency-phase detector, Ohm, no more
Output impedance of the reference frequency divider, Ohm, not more than ..........200
Output impedance of the control output of indication of phase synchronization, Ohm, not more than .................................200
Output impedance of the exemplary frequency generator, Ohm, not more than .......... 200
The input current of the input for rewriting information from the receiving register to the buffer (pin 7), the input of clock pulses for writing information (pin 8), the input for recording information about the division ratio (pin 10) and the input of the signal to turn off the output of the reference frequency divider (pin. 13), µA, not more than ......................±1
The input current of the RF input of the amplifier-shaper (pin 5) and the input of the reference frequency generator (pin 12), µA, for a low level signal, not less ... -30 high level, not more than . .+30

Limit values

Limit values of supply voltage, V ........3...6
The highest electrostatic potential, V, not less than ............... 150
Ambient temperature operating range, °С ... .-60 ... +70
Limit values of ambient temperature, °С ................-70;+85

On fig. 3 shows one of the possible schemes for switching on the device. When choosing a quartz resonator for a reference frequency generator, it must be taken into account that the resonator must operate at a parallel resonance, the frequency of which is greater than the serial frequency. By connecting a coil with an inductance of 10 μH in series with the resonator, it is possible to approach the frequency of the series resonance, the value of which is usually marked with a quartz resonator.

Fig.3 (click to enlarge)

By adjusting the capacitor C1, stable generation is achieved, which can be seen by removing the signal from the pin. 11 microchips. In normal mode, this signal is a sinusoid with a double amplitude of 1 ... 1.2 V with a constant component of about half Upit.

If an external stable quartz oscillator is used as a reference, its output signal with a voltage of 100 ... 250 mV is fed to the pin. 12 through an isolation capacitor with a capacity of 1000 ... 10 pF.

A significant reduction in power consumption (when operating at a frequency of up to 600 MHz) can be achieved by lowering the supply voltage to 3,3 ... 4 V. In this case, the current consumption decreases to 4 ... .

Authors: V. Melnik, V. Nikitin, Moscow; Publication: N. Bolshakov, rf.atnn.ru

See other articles Section Application of microcircuits.

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