MITEL SP8715

SP8715
SP8715
1100MHz Very Low Current Multi-Modulus Divider
DS3830
Issue 4.2
September 1999
Features
Odering Information
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Operation to 1100MHz
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†
SP8715/IG/MPAS Industrial Temperature Range
Miniature Plastic SOIC Package
SP8715/IG/MPAC As Above supplied on Tape
and Reel
Description
Applications
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The SP8715 is a switchable divide by 64/65, 128/129
programmable divider which is guaranteed to operate up
to 1100MHz. It will operate from a supply of 2.7V to 5.25V
and requires typically 3.6mA (including the output current).
It also features a power down facility for battery economy.
Cellular Telephones
Cordless Telephones
Mobile Radio
†
ESD precautions must be observed
The RF inputs are internally biased and should be
capacitively coupled to the signal source. The output is
designed to interface with CMOS synthesisers.
V
CK
6
D
MC
D TYPE
BIAS
Q
3
250K
RS
V
RF
INPUT
(CLOCK)
CC
2
CC
CONTROL
LOGIC
7
POWER
DOWN
5
NOMINAL
V
EE
1
DIVIDE BY
4/5
DIVIDE BY
16 / 32
4
OUTPUT
8
V
EE
Figure 1 Block Diagram
1
SP8715
MP8
Figure 2 Pin Connections
Absolute Maximum Ratings
Supply voltage (VEE=0V)
(note 1)
-0.5V to 7V
Control and RF inputs,
RF output (VEE =0V)
(note 1)-0.5V to VCC+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):
VCC=+2.7V to +5.25V (with respect to VEE), Output load (pin 4) = 10pF, Tamb = -40°C to +85°C (note 2)
Value
Characteristic
Min.
Max.
Units
Conditions
Supply current
(note 3)
3.6
4.2
mA
Power down input low
Supply current
(note 3)
8
50
µA
Power down input high
Power down high
VCC-0.5
VCC
V
Power down low
0
VCC-2.0
V
Modulus control high
(note 4)
0.6VCC
VCC
V
Divide by 64 or 128
Modulus control low
(note 4)
0
0.4VCC
V
Divide by 65 or 129
Ratio select high
(note 4, 9)
0.6VCC
VCC
V
Divide by 64 or 65
Ratio select low
(note 4, 9)
0
0.4VCC
V
Divide by 128 or 129
Max. sinewave input frequency
1100
Min. sinewave input frequency
200
Min. RF input voltage
50
Max. RF input voltage
2
Typ.
200
MHz
See Figure 5
MHz
See Figure 5
mV RMS RF input 200MHz to
1100MHz. See Figure 5
mV RMS RF input 200MHz to
1100MHz. See Figure 5
SP8715
Electrical Characteristics (Continued)
Guaranteed over the following conditions (unless otherwise stated):
VCC=+2.7V to +5.25V (with respect to VEE), Output load (pin 4) = 10pF, Tamb = -40°C to +85°C (note 2)
Value
Characteristic
Min.
Output level (pin 4)
500
Modulus set-up time, ts (notes 5,6,8)
20
Typ.
Max.
Units
600
Conditions
mV p-p
ns
RF input = 1GHz
Modulus hold time, th
(notes 6,8)
1
ns
RF input = 1GHz
Power down time, tpd
(notes 7,8)
10
µs
See Figure 9
6
µs
See Figure 9
Power down recovery time, tpu
(notes 7,8)
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 guaranteee by design.
9. The ratio select pin is not intended to be switched dynamically.
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 SP8715 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-down resistor. If the battery economy facility is not
used, pin 7 should be either left unconnected or
connected to VEE.
3
Ratio
Select
(Pin 3)
Modulus
Control
(Pin 6)
L
L
H
H
L
H
L
H
Division
Ratio
129
128
65
64
RF INPUT VOLTAGE (mV RMS)
SP8715
Table 1 Truth Table
1000
800
TYPICAL
OVERLOAD
600
400
TYPICAL
SENSITIVITY
200
GUARANTEED*
OPERATING WINDOW
0
200
400
600
800
1000
1200
FREQUENCY (MHZ)
* Tested as specified in table of Electrical Characteristics
Figure 3 Typical Input Characteristics
RF INPUT
CLOCK
MODULUS
CONTROL
INPUTS
DON'T CARE
DON'T CARE
32 (64)
OUTPUT
ts
th
Figure 4 Modulus Control Timing Diagram
4
32 (64) or 33 (65)
SP8715
V CC
100n
50‰
MONITOR
1n
V CC
50‰
SIGNAL
SOURCE
V EE
POWER
DOWN
RF INPUT
SP8715
OUTPUT
OUTPUT
1n
CL
RF INPUT
RATIO
SELECT
MC
10n
10n
MODULUS
CONTROL 1 INPUT
MODULUS
CONTROL 2 INPUT
Figure 5 Toggle Frequency Test Circuit
j1
j2
j0.5
S11
PLOT 50 OHM
NORMALISED
j0.2
0.2
0.5
1
2
f1
-j0.2
f1: 130MHz
f2: 1310MHz
f2
-j0.5
-j2
-j1
Figure 6 Typical S11 parameter for pin 1. VCC = +5.0V
5
SP8715
300
200
R( )
100
0
-100
-200
-300
jx ( )
-400
-500
-600
-700
-800
100
200
300
400
500
600
700
800
900
INPUT FREQUENCY (MHz)
1000
Figure 7 Typical Input Impedance v. Frequency
6
1100
1200
1300
1400
SP8715
FREQ-MHZ
R (Ω)
jx (Ω)
130.000
153.600
177.200
200.800
224.400
248.000
271.600
295.200
318.800
342.400
366.000
389.600
413.200
436.800
460.400
484.000
507.600
531.200
554.800
578.400
602.000
625.600
649.200
672.800
696.400
720.000
743.600
767.200
790.800
814.400
838.000
861.600
885.200
908.800
932.400
956.000
979.600
1003.20
1026.80
1050.40
1074.00
1097.60
1121.20
1144.80
1168.40
1192.00
1215.60
1239.20
1262.80
1286.40
1310.00
255.068
153.362
153.330
115.187
88.649
80.815
71.050
56.207
39.526
41.338
38.779
39.210
23.809
21.221
27.545
23.333
22.227
19.931
17.767
17.636
14.607
12.479
13.075
12.891
12.583
11.250
10.213
10.187
11.269
11.081
10.509
10.063
10.172
10.745
10.841
10.884
12.260
12.984
14.508
16.625
19.260
22.799
23.285
21.149
18.956
16.434
14.377
13.743
12.711
12.776
12.598
-733.538
-688.623
-583.339
-545.839
-482.377
-441.798
-411.502
-369.645
-346.620
-323.129
-304.804
-280.556
-269.674
-255.279
-245.161
-234.680
-224.572
-211.375
-203.241
-194.613
-186.545
-182.049
-174.839
-168.320
-160.468
-156.267
-149.642
-145.328
-143.144
-137.557
-132.750
-129.254
-124.495
-120.568
-118.100
-113.395
-109.552
-105.975
-103.110
-99.886
-98.149
-98.605
-99.907
-100.925
-99.639
-98.425
-95.033
-92.553
-89.249
-86.081
-82.581
Table.2 Coefficients for Figure 7
7
SP8715
CURRENT
VOLTAGE
tpu
0.95 I C
VCC - 0.5V
POWER
DOWN
INPUT
VOLTAGE
SUPPLY
CURRENT
VCC - 2.0V
tpd
TIME
Figure 8 Power Up and Power Down
Figure 9 Power-Down Time Test Circuit
8
0.05 I C
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