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SP8713 SP8713
1100MHz Very Low Current Three Modulus Divider
DS3934 - 4.0 November 1997
The SP8713 is a switchable divide by 64/65/72 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 4.1mA (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, such as the NJ88C50.
RF INPUT VCC MODULUS CONTROL 1 OUTPUT
1 2 3 4 SP8713
8 7 6 5
RF INPUT POWER DOWN MODULUS CONTROL 2 VEE
FEATURES s s s s s s s Operation to 1100MHz Very Low Power Single Supply Operation 2.7V to 5.25V Power Down Facility for Battery Economy Latched Modulus Control Inputs Push Pull Output Drive ESD Protection on All Pins†
MP8
Fig. 1 Pin connections - top view
APPLICATIONS s Cellular Telephones s Cordless Telephones s Mobile Radio
†
ORDERING INFORMATION
SP8713 IG MPAS Industrial Temperature Range Miniature Plastic DIL Package SP8713 IG MPAC As above supplied on Tape and Reel
ESD precautions must be observed
V
CC 2 250K NOMINAL
6 MC1
D
DD TYPE TYPE
CK
Q 7 POWER DOWN
3 MC2
BIAS
Q
D V CC
D TYPE
CONTROL LOGIC
5 V EE
RF INPUT (CLOCK)
1
DIVIDE BY 4/5
8 V
DIVIDE BY 16
4 OUTPUT
EE
Fig. 2 Block diagram
1
SP8713
ABSOLUTE MAXIMUM RATINGS
Supply voltage (VEE=0V) (note 1) -0.5V to 7V Control and RF inputs, (note 1) -0.5V to VCC+0.5V RF output (VEE =0V) 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. (note 3) (note 3) VCC-0.5 0 (note 4) (note 4) (note 4) (note 4) 0.6VCC 0 0.6VCC 0 1100 200 50 200 500 (notes 5,6,8) (notes 6,8) (notes 7,8) 20 1 10 6 600 Typ. 4.1 8 Max. 4.7 50 VCC VCC-2.0 VCC 0.4VCC VCC 0.4VCC Units Conditions
Supply current Supply current Power down high Power down low Modulus control 1 high Modulus control 1 low Modulus control 2 high Modulus control 2 select low Max. sinewave input frequency Min. sinewave input frequency Min. RF input voltage Max. RF input voltage Output level (pin 4) Modulus set-up time, ts Modulus hold time, th Power down time, tpd
mA µA V V V V V V MHz MHz
Power down input low Power down input high
Divide by 64 or 72 Divide by 65 or 72 Divide by 72 Divide by 64 or 65 See Figure 5 See Figure 5
mV RMS RF input 200MHz to 1100MHz. See Figure 5 mV RMS RF input 200MHz to 1100MHz. 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, 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 guranteed by design.
2
SP8713
OPERATING NOTES
The RF inputs are biased internally and are normally coupled to the signal source with suitable capacitors. 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 SP8713 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 VEE.
RF INPUT VOLTAGE (mV RMS)
1000
Modulus Control 1 (Pin 3) L H H L
Modulus Control 2 (Pin 6) L L H H
Division Ratio
800 TYPICAL OVERLOAD
600
65 64 72 72
400 TYPICAL SENSITIVITY 200 GUARANTEED* OPERATING WINDOW
Table 1 Truth table
0 200 400 600 800 1000 1200
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 or 36
32, 33 or 36
ts th
Fig. 4 Modulus control timing diagram
3
SP8713
V CC 100n 50Ω MONITOR 1n 50Ω SIGNAL SOURCE
V CC RF INPUT
V EE POWER DOWN
SP8713
OUTPUT 1n RF INPUT MC 1 MC 2 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
0.2
0.5
1
2
f1
-j0.2
f1: 130MHz f2: 1310MHz
-j0.5
f2 -j2
-j1
Fig. 6 Typical S11 parameter for pin 1. VCC = +5.0V
4
SP8713
300
200
R(Ω )) R(
100
0
-100
-200
-300
jx (Ω )) jx( -400
-500
-600
-700
-800 100
200
300
400
500
600
700 800 900 INPUT FREQUENCY (MHz)
1000
110.