SP8795 Ver la hoja de datos (PDF) - Zarlink Semiconductor Inc
Número de pieza
componentes Descripción
Fabricante
SP8795 Datasheet PDF : 5 Pages
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OPERATING NOTES
1. The clock input (Pin 5) should be capacitively coupled to
the signal source. The input signal path is completed by
coupling a capacitor from the internal bias decoupling, Pin 6 to
ground.
2. The output stage which is normally open collector (Pin 2
open circuit) can be interfaced to CMOS. The open collector
can be returned to a +10V line via a 5k resistor but the output
sink current should not exceed 2mA. If interfacing to TTL is
required then Pins 2 and 7 should be connected together to
give a fan-out = 1. This will increase supply current by
approximately 2mA.
3. The circuit will operate down to DC but a slew rate of better
than 20V/~s is required.
4. The mark space ratio of the output is approximately 1.2:1
at 200MHz.
SP8795
5. Input impedance is a function of frequency. See Fig.5.
6. If no signal is present the device will self-oscillate. If this is
undesirable it may be prevented by connecting a 150k
between unused input and ground. This reduces the input
sensitivity by typically 50-100mV p-p.
7. The internal regulator has its input connected to Pin 8,
while the internal reference voltage appears at Pin 7 and
should be decoupled. For use from a 5.2V supply, Pins 7 and
8 should be connected together, and 5.2V applied to these
pins. For operation from supply voltages in the range +6.8V to
+9.5V, Pins 7 and 8 should be separately decoupled, and the
supply voltage applied to Pin 8.
Figure 5 : Typical impedance. Test conditions: supply voltage 5.2V, ambient temperature 25°C, frequencies in
MHz, impedance normalised to 50 ohms.
VCC OF MODULUS
CONTROL DEVICE
CONTROL
INPUT
OUTPUT
1
8
2
7
SP8795
3
6
4
5
1n
1n
100n
VCC1
50
MONITOR
50
SIGNAL
SOURCE
Figure 6 : Toggle frequency test circuit
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