Datasheet SP5070DP, SP5070MP Datasheet (MITEL)

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1 2 3 4

5 6 7

14 13 12 11

REF IN/CRYSTAL

OSCILLATOR CAPACITOR

RF INPUT

DP14

CPDIS

9 8DRIVE OUTPUT

CHARGE PUMP

TEST 2

TEST 1

RF INPUT

SP5070

REF IN/CRYSTAL

OSCILLATOR CAPACITOR

RF INPUT

MP14

CPDIS

DRIVE OUTPUT

CHARGE PUMP

TEST 2

TEST 1

RF INPUT

1 2 3 4

5 6 7

13 12 11

9 8

SP5070F

The SP5070 is a single modulus frequency synthesiser for use in Satellite TV receivers and together with an appropriate voltage controlled oscillator (VCO), forms a complete phase locked loop (PLL) synthesiser. The circuit consists of a prescaler with preampliﬁer and a ﬁxed modulus divider. The phase comparator is fed with a reference frequency derived from an external oscillator or crystal. The comparator has a charge pump output ampliﬁer stage around which feedback may be applied. Only an external transistor is required for varicap line driving.

FEATURES

■ Low Power Consumption (5V, 47mA typ.)

■ Prescaler and Preampliﬁer Included

■ Charge Pump Ampliﬁer with Feedback Point

■ Charge Pump Disable Facility

■ Synthesises Frequencies up to 2.4GHz

■ Pin and Function Compatible with SP5060 and

SP5062

■ Full ESD Protection*

* Normal ESD handling procedures should be observed.

APPLICATIONS

■ Satellite TV

■ High IF Cable Tuning Systems

■ C-Band with Frequency Doubling Mixer

ORDERING INFORMATION

SP5070 DP - (14 Lead Plastic Package)

SP5070F MP - (14 Lead Miniature Plastic Package)

Fig.1 Pin connections - top view

Fig.2 Block diagram of SP5070

RF IN RF IN

OSCILLATOR

CAPACITOR

REF IN/

CRYSTAL

TEST 1 TEST 2

CPDIS

PUMP

DRIVE

FDIV

FCOMP

CHARGE

PUMP

FIXED

MODULUS

DIVIDER

÷8192

1 6

149 10

2 3

OUTPUT BUFFER

COMP

PHASE

PRESCALER

÷32

PRE AMP

REFERENCE

DIVIDER

÷1024

SP5070

2.GHz Fixed Modulus Frequency Synthesiser

DS3966-2.2 May 996

Page 2

SP5070

ELECTRICAL CHARACTERISTICS

Tamb = -40°C to +85°C,VCC = +4.5V to +5.5V. 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 Symbol Pin

Min

Value

Typ Max

Units Conditions

Supply current I

1 - 47 55 mA VCC = 5V

Prescaler input voltage Prescaler input voltage

2,3 2,3

100

300 300

RMS

300MHz to 1.8GHz sinewave

2.4GHz, see Fig.5

Prescaler input impedance Input capacitance

2,3 2,3

Ω

Charge pump output current Charge pump output leakage Drift due to leakage

Charge pump drive output current

Charge pump ampliﬁer gain

8 8

±100

6400

±5

µA

mV/s

V pin 8 = 2.0V V pin 8 = 2.0V At collector of External

Varicap Drive transistor V pin 7 = 0.7V

pin 7 current 100µa

Oscillator temperature stability Oscillator stability with

supply voltage

9,10 9,10

2 2

ppm/°C

ppm/V

Reference clock frequency External reference amplitude

10 10

150

500

MHz

RMS

Charge pump disable/TEST 1 and TEST 2/enable

Charge pump disable leakage

-250

-500 10

µA µA

VIN<0V V pin 11= V

TEST 1/TEST 2 sink current 13,14 1 - - mA VOUT = 0.7V TEST 1/TEST 2 leakage current 13,14 - - 10 µA VOUT = VCC+0.3V TEST 1/TEST 2 voltage 13,14 - - VCC+0.3 V

ABSOLUTE MAXIMUM RATINGS

All voltages are referred to VEE = 0V

Characteristics Pin

Value

Units

Min Max

Supply voltage RF input voltage RF input DC offset Charge pump DC offset Charge pump disable Drive DC offset Crystal oscillator DC offset TEST outputs Storage temperature Junction temperature DP14 thermal resistance, chip-to-ambient DP14 thermal resistance, chip-to-case MP14 thermal resistance, chip-to-ambient MP14 thermal resistance, chip-to-case Power consumption at 5.5V

1 2,3 2,3

9,10

13,14

-0.3

-0.7

-0.3

-55

2.5 VCC+0.3 VCC+0.3 VCC+0.3 VCC+0.3 VCC+0.3 VCC+0.3

150

+150

78 30

123

275

Vp-p

V V V V V

V °C °C

°C/W °C/W °C/W °C/W

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SP5070

FUNCTIONAL DESCRIPTION

The SP5070, when used with a voltage controlled oscillator, forms a complete phase locked loop frequency synthesiser.

The phase comparator comparison frequency is obtained by dividing the reference frequency. This may be generated on-chip by means of an external crystal, or from an external reference oscillator.

The output of the prescaler is divided by the ﬁxed modulus divider, producing an output frequency which is phased locked to the comparison frequency.

The divider stages are arranged to give a ﬁxed ratio between the synthesised frequency and the reference of 256:1. Any frequency within the range of 300MHz to 2.4GHz may be achieved by using the appropriate reference or crystal frequency.

A single external transistor, driven from the charge pump output, provides the output drive necessary for the oscillator varicap line.

A test facility which disables the charge pump is also provided. This is activated when a negative voltage is applied to pin 11, see electrical characteristics above. When the device is in this mode, F

COMP

and F

DIV

are also available at outputs TEST1 and TEST2 respectively. These are open collector outputs and are each capable of sinking a minimum of 1mA. In normal mode of operation these outputs are high impedance.

For compatibility with SP5060/SP5062, pin 11 may be

connected toV

Fig.3 Typical application and test circuit (1024MHz with 4MHz reference crystal)

Fig.4 Application using external reference oscillator

1 2 3

4 5 6 7

14 13

12 11

DP14

9 8

S P 5 0 7 0

+5V

FROM

VCO

2N3904

10K

47K

10n

22K

47n

180n

+30V

100p

FROM REFERENCE OSCILLATOR

VARICAP

INPUT

VCO

1 2 3 4

5 6 7

13 12 11

9 8

S P 5 0 7 0

+5V

FROM

VCO

2N3904

10K

47K

10n

22K

47n

180n

+30V

68p

4MHz REFERENCE CRYSTAL

VARICAP

INPUT

VCO

47P

Page 4

SP5070

Fig.5 Typical input sensitivity Fig.6 Typical input impedance

Fig.7 SP5070 input/output interface circuits

= 50 Ω

FREQUENCY MARKER STEP = 500MHz

RF input Loop amplifier

Reference oscillator

TEST 1and TEST 2 outputs

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