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SP8714
SP8714
2100 MHz Very Low Current Multi-Modulus Divider
March 2006
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.
Ordering Information
Industrial Temperature Range
Miniature Plastic SOIC Package
SP8714/IG/MPAS
8 Pin SOP/SOIC Tubes
SP8714/IG/MPAC
8 Pin SOP/SOIC Tape & Reel
SP8714/IG/MPBQ
8 Pin SOP/SOIC* Tape & Reel
SP8714/IG/MPBP
8 Pin SOP/SOIC* Tubes
*Pb Free Matte Tin
FEATURES
I
I
I
I
I
I
I
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
†
RF INPUT
V
CC
RATIO SELECT
OUTPUT
1
2
3
4
SP8714
8
7
6
5
RF INPUT
POWER DOWN
MODULUS CONTROL
VEE
APPLICATIONS
I
Cellular Telephones
I
Cordless Telephones
†
MP8
Fig. 1 Pin connections - top view
ESD precautions must be observed
V
CK
6
MC
D
CC
2
250K
NOMINAL
D TYPE
Q
7
POWER
DOWN
3
RS
V
CC
BIAS
CONTROL
LOGIC
5
V
EE
RF
INPUT
(CLOCK)
1
DIVIDE BY
4/5
8
V
DIVIDE BY
8 / 16
4
OUTPUT
EE
Fig. 2 Block diagram
1
Zarlink Semiconductor Inc.
Zarlink, ZL and the Zarlink Semiconductor logo are trademarks of Zarlink Semiconductor Inc.
Copyright
1999-2006,
Zarlink Semiconductor Inc. All Rights Reserved.
0
SP8714
ABSOLUTE MAXIMUM RATINGS
Supply voltage (V
EE
=0V)
(note 1)
-0.5V to 7V
Control and RF inputs,
RF output (V
EE
=0V)
(note 1) -0.5V to V
CC
+0.5V
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):
V
CC
=+2.7V to +5.25V (with respect to V
EE
), Output load (pin 4) = 10pF, T
amb
= -40°C to +85°C (note 2)
Value
Characteristic
Min.
(note 3)
(note 3)
V
CC
-0.5
0
(note 4)
(note 4)
(note 4, 9)
(note 4, 9)
0.6V
CC
0
0.6V
CC
0
2100
200
50
200
500
(notes 5,6,8)
(notes 6,8)
(notes 7,8)
10
1
10
8
600
Typ.
6.8
8
Max.
8.5
50
V
CC
V
CC
-2.0
V
CC
0.4V
CC
V
CC
0.4V
CC
Units
Conditions
Supply current
Supply current
Power down high
Power down low
Modulus control high
Modulus control low
Ratio select high
Ratio select low
mA
µA
V
V
V
V
V
V
MHz
MHz
Power down input low
Power down input high
Divide by 32 or 64
Divide by 33 or 65
Divide by 32 or 33
Divide by 64 or 65
See Figure 5
See Figure 5
Max. sinewave input frequency
Min. sinewave input frequency
Min. RF input voltage
Max. RF input voltage
Output level (pin 4)
Modulus set-up time, t
s
Modulus hold time, t
h
Power down time, t
pd
mV RMS RF input 200MHz to
2100MHz. See Figure 5
mV RMS RF input 200MHz to
2100MHz. See Figure 5
mV p-p
ns
ns
µs
µs
RF input = 1GHz
RF input = 1GHz
See Figure 9
See Figure 9
Power down recovery time, t
pu
(notes 7,8)
NOTES
2. All electrical testing is performed at +85°C.
3. Typical values are measured at +25°C and V
CC
= +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
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 not suitable for driving TTL or similar devices.
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
.
RF INPUT VOLTAGE (mV RMS)
1000
Ratio
Select
(Pin 3)
L
L
H
H
Modulus
Control
(Pin 6)
L
H
L
H
Division
Ratio
800
TYPICAL
OVERLOAD
600
65
64
33
32
400
TYPICAL
SENSITIVITY
GUARANTEED*
OPERATING WINDOW
200
Table 1 Truth table
0
500
1000
1500
2000
2500
3000
FREQUENCY (MHz)
*
Tested as specified in table of Electrical Characteristics
Fig. 3 Typical input characteristics
RF INPUT
CLOCK
MODULUS
CONTROL
INPUTS
DON'T CARE
DON'T CARE
OUTPUT
32 (16)
32 (16) or 33 (17)
ts
th
Fig. 4 Modulus control timing diagram
2
SP8714
V CC
100n
50Ω
MONITOR
1n
50Ω
SIGNAL
SOURCE
V CC
RF INPUT
V EE
POWER
DOWN
SP8714
OUTPUT
1n
RF INPUT
MC
RATIO
SELECT
CL
OUTPUT
10n
10n
MODULUS
CONTROL 1 INPUT
MODULUS
CONTROL 2 INPUT
Fig. 5 Toggle frequency test circuit
j1
j0.5
j2
S11
PLOT 50 OHM
NORMALISED
j0.2
f2
0.2
0.5
1
2
f1
-j0.2
f1: 130MHz
f2: 2.49GHz
-j0.5
-j2
-j1
Fig. 6 Typical S11 parameter for pin 1. V
CC
= +5.0V
4
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