MITEL SP5658 Technical data

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SP5658

2.7GHz 3-Wire Bus Controlled Frequency Synthesiser

Advance Information

Supersedes October 1996 Media IC Handbook HB3923-2 DS4064 - 4.1 March 1998

The SP5658 is a single chip frequency synthesiser

designed for tuning systems up to 2.7GHz.

The RF preamplifer contains a divide by two prescaler which can be disabled for applications up to 2GHz so enabling a step size equal to the comparison frequency up to 2GHz and twice the comparison frequency up to 2.7GHz.

Comparison frequencies are obtained either from a crystal controlled on–chip oscillator or from an external source.

The device contains two switching ports, in the 14 pin version and four in the 16 pin, together with an ‘‘in–lock” flag output. The device also contains a varactor line disable and charge pump disable facility.

FEATURES

■ Complete 2.7GHz single chip system

■ Optimised for low phase noise

■ Selectable divide by two prescaler

■ Selectable reference division ratio

■ Charge pump disable

■ Varactor line disable

■ ‘In–lock’ flag

■ Two switching ports in 14 pin version

■ Four switching ports in 16 pin version

■ Pin compatible with SP5659 I 2 C bus low

phase noise synthesiserPP

■ ESD protection (Normal ESD handling procedures should be observed)

APPLICATIONS

■ SAT, TV, VCR and Cable tuning systems

■ Communications systems

CHARGE PUMP

CRYSTAL

DISABLE

ENABLE

DATA

CLOCK

PORT P1/OC

CHARGE PUMP

CRYSTAL

DISABLE

ENABLE

DATA

CLOCK PORT P3 PORT P2

114

116116

SP5658S SP5658F

Fig. 1 Pin connections – top view

ORDERING INFORMATION

SP5658F/KG/MP1S (Tubes, 14 lead SO) SP5658S/KG/MP2S (Tubes, 16 lead SO) SP5658F/KG/MP1T (Tape and Mounted) SP5658S/KG/MP2T (Tape and Mounted)

DRIVE V

RF INPUT RF INPUT V

LOCK PORT P0/OP

DRIVE V

RF INPUT RF INPUT V

LOCK PORT P0/OP PORT P1/OC

MP14

MP16

SP5658

INPUTS

DISABLE

ENABLE

DATA

CLOCK

PHASE

PROGRAMMABLE

DIVIDER

-16/17

DISABLE

INTERFACE

DATA

4 BIT

COUNT

18 BIT LA

- 2/1

3 4 5 6

13 BIT

COUNT

TCH

LA INTERFACE

P3 P0/OP

COMP

CHARGE

PUMP

1 BIT

LATCH

4 BIT

TCH

AND

PORT

P2 P1/0C

comp

3 BIT LA

(R0,R1,R2)

REFERENCE

DIVIDER

See T

able 1

TCH

1 BIT

LATCH

FLOCK

11107

LOCK

OSC 2

1 BIT

LATCH

CRYSTAL

CHARGE

PUMP

DRIVE

Fig. 2 SP5658S block diagram

SP5658

ELECTRICAL CHARACTERISTICS

T amb = –20°C to + 80°C, VCC = + 4.5V to + 5.5V. Reference frequency = 4MHz. These characteristics are guaranteed by either production test or design. They apply within the specified ambient temperature and supply voltage ranges unless otherwise stated.

Characteristics Pin Units Conditions

Value

(SP5658S)

Supply current, I

12 59 74 mA V

RF input voltage 13, 14 40 300 mV

Min Typ Max

52 65 mA V

=5V Prescaler enabled, DE=1

=5V Prescaler disabled, DE=0

300MHz to 2.7GHz Prescaler

rms

enabled, DE=1, See Fig. 5b

13,14 100 300 mV

80MHz Prescaler enabled,

rms

DE=1, See Fig. 5b.

13, 14 40 300 mV

100MHz to 2.0GHz Prescaler

rms

disabled, DE=0, See Fig. 5a

13,14 50 300 mV

80MHz Prescaler disabled,

rms

DE=0, See Fig. 5a. RF input impedance 13, 14 50 Ω Refer to Fig. 4 RF input capacitance 13, 14 2 pF Refer to Fig. 4 Data, Clock, Enable & Disable 3,4,5,6 Input high voltage 3 V

V Input low voltage 0 0.7 V Input high current 10 µA Input voltage = V Input low current –10 µA Input voltage = V Clock Rate 6 500 kHz Clock data & enable input 4,5,6 0.4 V

hysteresis

SP5658

ELECTRICAL CHARACTERISTICS

T amb = –20°C to + 80°C, VCC = + 4.5V to + 5.5V. Reference frequency = 4MHz. These characteristics are guaranteed

by either production test or design. They apply within the specified ambient temperature and supply voltage ranges unless otherwise stated.

Characteristics Pin Value Units Conditions

(SP5658S)

Min Typ Max

Bus Timing 4,5,6

Data set up, t Data hold, t Enable set up, t Enable hold, t Clock to enable, t

Charge pump output current 1 See Table 3, V Charge pump output leakage 1 ± 3 ± 10 nA V Charge pump drive output 16 1 mA V

current

300 ns See Fig. 3 600 ns See Fig. 3 300 ns See Fig. 3 600 ns See Fig. 3 300 ns See Fig. 3

= 2V

PIN1

= 0.7V

PIN16

PIN1

= 2V

Oscillator temperature stability 2 2 ppm/°C Oscillator supply voltage 2 2 ppm/V

stability External reference input 2 2 20 MHz AC coupled sinewave

frequency External reference input 2 200 500 mV

amplitude

AC coupled sinewave

Crystal frequency 2 4 12 MHz Crystal oscillator drive level 2 45 mV

Recommended crystal series 100 200 Ω Applies to 4MHz crystal only. resistance ‘‘Parallel resonant” crystal. Figure

quoted is under all conditions including start up.

Crystal oscillator negative 2 400 Ω Includes temperature and process resistance tolerances.

Comparison frequency 2 MHz Phase noise at phase detector –142 dBC/ 6kHz loop BW, phase comparator

Hz freq 250kHz. Figure measured @

1kHz offset, DSB (within loop band width).

RF division ratio 240 131071 Prescaler disabled, DE=0

480 262142 Prescaler enabled, DE=1 Reference division ratio See Table 1 Output ports P0–P3 # 7,8,9,10

Sink current 10 mA V Leakage current 10 µAV

PORT

=0.7V =13.2V

Lock output 11

Sink current 1 mA V

=0.7V, ‘out of lock’

LOCK

Leakage current 10 µA ‘in lock’

# Ports P2 and P3 are not available on the SP5658F.

ABSOLUTE MAXIMUM RATINGS

All voltages are referred to V EE at 0V

Characteristics Pin Min Max Units Conditions

(SP5658S)

SP5658

Supply voltage, V

RF input voltage 13, 14 2.5 V

12 –0.3 7 V

p–p

AC coupled as per application RF input DC offset 13, 14 –0.3 VCC +0.3 V Port voltage 7 – 10 –0.3 14 V Port in off state

7 – 10 –0.3 6 V Port in on state Total port current 7 – 10 50 mA Lock output DC offset 11 –0.3 V Charge pump DC offset 1 –0.3 V

+0.3 V

Drive DC offset 16 –0.3 VCC +0.3 V Crystal DC offset 2 –0.3 VCC +0.3 V Data, Clock, Enable & Disable DC 3 – 6 –0.3 V

+0.3 V

offset Storage temperature –55 +125 °C Junction temperature 150 °C

MP14 Thermal Resistance

Chip to ambient 123 °C/W Chip to case 45 °C/W

MP16 Thermal Resistance

Chip to ambient 111 °C/W Chip to case 41 °C/W

Power consumption at V

=5.5V 407 mW All ports off, prescaler enabled

ESD protection ALL 2 kV MIL–STD 883 TM 3015

FUNCTIONAL DESCRIPTION

The SP5658 contains all the elements necessary, with the exception of a frequency reference, loop filter and external high voltage transistor, to control a varicap tuned local oscillator, so forming a complete PLL frequency synthesised source. The device allows for operation with a high comparison frequency and is fabricated in high speed logic, which enables the generation of a loop with good phase noise performance. The RF preamplifier contains a selectable divide by two for operation above 2.0GHz. Up to 2GHz the RF input interfaces directly with the programmable divider, so eliminating degradation in phase noise due to the prescaler action. The block diagram is shown in Fig.2.

The SP5658 is controlled by a standard 3–wire bus comprising data, clock and enable inputs. The programming word for the 16 pin variant contains 28 bits, four of which are used for port selection, 18 to set the programmable divider ratio and enable/disable the prescaler, bit DE, three bits to select the reference division ratio, bits R0–R2, one bit to set charge pump current, bit C0, and the remaining two bits to access test modes, bit T0, and to disable the varactor drive, bit OS. The data word for 14 pin variant is identical to 16 pin except 26 bits only are required, two of which are used for port selection. The programming format is shown in Fig. 3.

The clock input is disabled by an enable low signal, data is therefore only clocked into the internal shift registers during an enable high and is loaded into the controlling buffers by an enable high to low transition. This load is also synchronised with the programmable divider so giving smooth fine tuning.

The RF signal is fed to an internal preamplifier, which provides gain and reverse isolation from the divider signals.

The output of the preamplifier is fed to the 2/1 selectable prescaler and then to the 17 bit fully programmable divider, which is of MN+A architecture. The M counter is 13 bit and the A counter 4. If bit DE is set to a 0 the prescaler is disabled; Note that the control function DE cannot be used dynamically.

The output of the programmable divider is fed to the phase comparator where it is compared in both phase and frequency domain with the comparison frequency. This frequency is derived either from the on board crystal controlled oscillator or from an external source. In both cases the reference frequency is divided down to the comparison frequency by the reference divider which is programmable into 1 of 8 ratios as described in Table 1.

The output of the phase comparator feeds the charge pump and loop amplifier section, which when used with an external high voltage transistor and loop filter integrates the current pulses into the varactor line voltage. The charge pump can be disabled to a high impedance state by the DISABLE input. The varactor drive output can also be disabled by the OS bit within the data word, so switching the external transistor ‘OFF’ and allowing an external voltage to be written to the varactor line for tuner alignment purposes.

The phase comparator also drives the lock detect circuit which generates a lock flag. ‘In–lock’ is indicated by a high impedance state on the lock output.

The programmable divider output divided by 2, F pd /2 and the comparison frequency, F comp can be switched to ports P0 and P1 respectively by switching the device into test mode. The test modes are described in Table 2.

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