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SA602A Datasheet(PDF) 3 Page - NXP Semiconductors

Part # SA602A
Description  Double-balanced mixer and oscillator
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Manufacturer  PHILIPS [NXP Semiconductors]
Direct Link  http://www.nxp.com
Logo PHILIPS - NXP Semiconductors

SA602A Datasheet(HTML) 3 Page - NXP Semiconductors

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Philips Semiconductors
Product specification
SA602A
Double-balanced mixer and oscillator
1997 Nov 07
3
BLOCK DIAGRAM
87
65
4
3
2
1
OSCILLATOR
VOLTAGE
REGULATOR
GROUND
V
CC
SR00069
Figure 2. Block Diagram
AC/DC ELECTRICAL CHARACTERISTICS
VCC = +6V, TA = 25°C; unless otherwise stated.
LIMITS
SYMBOL
PARAMETER
TEST CONDITIONS
SA602A
UNITS
MIN
TYP
MAX
VCC
Power supply voltage range
4.5
8.0
V
DC current drain
2.4
2.8
mA
fIN
Input signal frequency
500
MHz
fOSC
Oscillator frequency
200
MHz
Noise figure at 45MHz
5.0
5.5
dB
Third-order intercept point
RFIN = -45dBm: f1 = 45.0MHz
f2 = 45.06MHz
-13
-15
dBm
Conversion gain at 45MHz
14
17
dB
RIN
RF input resistance
1.5
k
CIN
RF input capacitance
3
3.5
pF
Mixer output resistance
(Pin 4 or 5)
1.5
k
DESCRIPTION OF OPERATION
The SA602A is a Gilbert cell, an oscillator/buffer, and a temperature
compensated bias network as shown in the equivalent circuit. The
Gilbert cell is a differential amplifier (Pins 1 and 2) which drives a
balanced switching cell. The differential input stage provides gain
and determines the noise figure and signal handling performance of
the system.
The SA602A is designed for optimum low power performance.
When used with the SA604 as a 45MHz cellular radio second IF and
demodulator, the SA602A is capable of receiving -119dBm signals
with a 12dB S/N ratio. Third-order intercept is typically -13dBm (that
is approximately +5dBm output intercept because of the RF gain).
The system designer must be cognizant of this large signal
limitation. When designing LANs or other closed systems where
transmission levels are high, and small-signal or signal-to-noise
issues are not critical, the input to the SA602A should be
appropriately scaled.
Besides excellent low power performance well into VHF, the
SA602A is designed to be flexible. The input, RF mixer output and
oscillator ports can support a variety of configurations provided the
designer understands certain constraints, which will be explained
here.
The RF inputs (Pins 1 and 2) are biased internally. They are
symmetrical. The equivalent AC input impedance is approximately
1.5k || 3pF through 50MHz. Pins 1 and 2 can be used
interchangeably, but they should not be DC biased externally.
Figure 5 shows three typical input configurations.
The mixer outputs (Pins 4 and 5) are also internally biased. Each
output is connected to the internal positive supply by a 1.5k
resistor. This permits direct output termination yet allows for
balanced output as well. Figure 6 shows three single ended output
configurations and a balanced output.


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