Datasheet SP8714IGMPAC, SP8714IGMPAS Datasheet (MITEL)

CC

C

Q

CC

O

O

C

S

RF INPUT

V

RATIO SELECT

OUTPUT

2100MHz Very Low Current Multi-Modulus Divider

The SP8714 is a switchable divide by 32/33, 64/65
programmable divider which is guaranteed to operate up to
2100MHz. It will operate from a supply of 2.7V to 5.25V and
requires typically 6.8mA (including the output current). It also
features a power down facility for battery economy.

The RF inputs are internally biased and should be capacitively
coupled to the signal source. The output is designed to interface
with CMOS synthesisers.

FEATURES

■ Operation to 2100MHz

■ Very Low Power

■ Single Supply Operation 2.7V to 5.25V

■ Power Down Facility for Battery Economy

■ Latched Modulus Control Input

■ Push Pull Output Drive

■ ESD Protection on All Pins

APPLICATIONS

■ Cellular Telephones

■ Cordless Telephones

†

SP8714

SP8714

DS3562 - 5.1 April 1999

CC

1 8
2 7

SP8714

3 6
4 5

RF INPUT

POWER DOWN

MODULUS CONTROL

V

EE

MP8

Fig. 1 Pin connections - top view

ORDERING INFORMATION

SP8714 IG MPAS Industrial Temperature Range
SP8714 IG MPAC As above supplied on Tape and Reel

Miniature Plastic SOIC Package

†

ESD precautions must be observed

RF
INPUT
(CLOCK)

6

M

3

R

1

8

D

V

D TYPE

V

EE

V

K

CONTROL

LOGIC

DIVIDE BY

4 / 5

DIVIDE BY

8 / 16

2

BIAS

250K

NOMINAL

7

P
DOWN

5

4

V

EE

UTPUT

WER

Fig. 2 Block diagram

1

SP8714

ABSOLUTE MAXIMUM RATINGS

Supply voltage (VEE=0V) (note 1) -0.5V to 7V

Control and RF inputs,

RF output (V

RF input current (note 1) 10mA

Operating temperature -40°C to +85°C

Storage temperature range -55°C to +150°C

Maximum junction temperature +150°C

NOTE 1. Duration <2 minutes.

ELECTRICAL CHARACTERISTICS

Guaranteed over the following conditions (unless otherwise stated):

VCC=+2.7V to +5.25V (with respect to VEE), Output load (pin 4) = 10pF, T

=0V) (note 1) -0.5V to VCC+0.5V

EE

= -40°C to +85°C (note 2)

amb

Characteristic Units Conditions

Value

Min. Typ. Max.

Supply current (note 3) 6.8 8.5 mA Power down input low
Supply current (note 3) 8 50 µA Power down input high
Power down high VCC-0.5 V

CC

V
Power down low 0 VCC-2.0 V
Modulus control high (note 4) 0.6V

CC

Modulus control low (note 4) 0 0.4V
Ratio select high (note 4, 9) 0.6V

CC

Ratio select low (note 4, 9) 0 0.4V

V

CC

CC

V

CC

CC

V Divide by 32 or 64

V Divide by 33 or 65

V Divide by 32 or 33

V Divide by 64 or 65
Max. sinewave input frequency 2100 MHz See Figure 5
Min. sinewave input frequency 200 MHz See Figure 5
Min. RF input voltage 50 mV RMS RF input 200MHz to

2100MHz. See Figure 5

Max. RF input voltage 200 mV RMS RF input 200MHz to

2100MHz. See Figure 5

Output level (pin 4) 500 600 mV p-p
Modulus set-up time, t
Modulus hold time, t
Power down time, t

h

pd

(notes 5,6,8) 10 ns RF input = 1GHz

s

(notes 6,8) 1 ns RF input = 1GHz
(notes 7,8) 10 µs See Figure 9

Power down recovery time, tpu(notes 7,8) 8 µs See Figure 9

NOTES

2. All electrical testing is performed at +85°C.

3. Typical values are measured at +25°C and VCC = +5V.

4. Modulus Control and Ratio Select are high impedance inputs which can be driven directly by standard CMOS outputs.

5. Modulus control is latched at the end of the previous cycle.

6. See Figure 4.

7. See Figure 8.

8. These parameters are not tested but are guaranteed by design.

9. The ratio select pin is not intended to be switched dynamically.

2

SP8714

O

S

O

)

)

OPERATING NOTES

The RF inputs are biased internally and are normally coupled to the signal source with suitable capaitors.
The output stage has a novel design and is intended to drive a CMOS synthesiser input. External pull-down resistors or

circuits are not required. The SP8714 is

The device will operate down to DC frequencies for non-sinusoidal signals provided that the input slew rate is better than

100V/µs.

POWER DOWN (pin 7) is connected internally to a pull-up resistor. If the battery economy facility is not used, pin 7 should

be connected to V

EE

.

not suitable for driving TTL or similar devices.

1000

RF INPUT

CLOCK

M

DULU

CONTROL

INPUTS

Ratio Modulus Division

Select Control Ratio

(Pin 3) (Pin 6)

LL65

LH64
HL33
HH32

Table 1 Truth table

800

TYPICAL

600

400

RF INPUT VOLTAGE (mV RMS)

200

0

500 1000 1500 2000 2500 3000

GUARANTEED*

OPERATING WINDOW

OVERLOAD

TYPICAL

SENSITIVITY

FREQUENCY (MHz)

* Tested as specified in table of Electrical Characteristics

Fig. 3 Typical input characteristics

DON'T CAREDON'T CARE

UTPUT

32 (16

t

s

t

h

32 (16) or 33 (17

Fig. 4 Modulus control timing diagram

3

SP8714

CC

CC

O

O

C

O

O

S

C

O

S

MONITOR

V

100n

50Ω

50Ω

SIGNAL

SOURCE

1n

1n

10n 10n

V

RF INPUT

SP8714

RF INPUT

M

M

DULU

CONTROL 1 INPUT

V

EE

P

WER

DOWN

UTPUT

RATI

SELECT

MODULU

CONTROL 2 INPUT

Fig. 5 Toggle frequency test circuit

j1

UTPUT

L

S11
PLOT 50 OHM
NORMALISED

f1: 130MHz
f2: 2.49GHz

j0.5

j0.2

f2

0.2 0.5 1 2

-j0.2

-j0.5 -j2

-j1

Fig. 6 Typical S11 parameter for pin 1. VCC = +5.0V

j2

f1

4

300

200

R(Ω)

R(Ω)

100

-100

-200

-300

jx (Ω)

jx(Ω)

-400

-500

SP8714

0

-600

-700

-800
100 300 500 700 900 1100 1300 1500 1700 1900 2100 2300 2500

INPUT FREQUENCY (MHz)

Fig. 7 Typical input impedance v. frequency

5

SP8714

FREQ-MHZ

130.000

177.200

224.400

271.600

318.800

366.000

413.200

460.400

507.600

554.800

602.000

649.200

596.400

743.600

790.800

838.000

885.200

332.400

979.600

1026.80

1074.00

1121.20

1168.40

1215.60

1262.80

1310.00

1357.20

1404.40

1451.60

1498.80

1546.00

1593.20

1640.40

1687.60

1734.80

1782.00

1829.20

1876.40

1923.60

1970.80

2018.00

2065.20

2112.40

2159.60

2206.80

2254.00

2301.20

2348.40

2395.60

2442.80

2490.00

R (Ω)

255.068

153.330

88.649

71.050

39.526

38.779

23.809

27.545

22.227

17.767

14.607

13.075

12.583

10.213

11.269

10.509

10.172

10.841

12.260

14.508

19.260

23.285

18.956

14.377

12.711

12.598

14.565

19.164

15.001

15.864

18.993

26.822

39.830

47.875

63.267

74.259

58.878

42.530

32.302

27.333

24.894

23.369

23.577

23.023

23.325

24.623

26.340

28.632

31.161

34.219

39.808

jx (Ω)

-733.538

-583.339

-482.377

-411.502

-346.620

-304.804

-269.674

-245.161

-224.572

-203.241

-186.545

-174.839

-160.468

-149.642

-143.144

-132.750

-124.495

-118.100

-109.552

-103.110

-98.149

-99.907

-99.639

-95.033

-89.249

-82.581

-77.212

-71.976

-70.250

-61.898

-53.403

-44.704

-41.522

-43.255

-44.879

-67.801

-86.964

-87.052

-80.484

-73.570

-67.291

-60.620

-54.716

-49.220

-43.340

-37.163

-30.805

-24.040

-17.165

-8.172

-4.368

Table.2 Coefficients for Fig.7

6

SP8714

C

O

S

OSC

OSCO

VOLTAGE

V - 0.5V

CC

V - 2.0V

CC

POWER

DOWN
INPUT

VOLTAGE

t

pu

SUPPLY

CURRENT

TIME

Fig. 8 Power up and power down

CURRENT

I

0.95

C

I

0.05

t

pd

C

GENERATOR

WER

P
SUPPLY

PUL

INPUT

E

47Ω

8

SP8714

1

+

-

PROBE POINT

URRENT SENSE

ILL

RESISTOR

PE

10nF

Fig. 9 Power-down time test circuit

7

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