Philips Semiconductors
Product specification
Double-balanced mixer and oscillator
NE/SA612A
ABSOLUTE MAXIMUM RATINGS
SYMBOL
PARAMETER
Maximum operating voltage
RATING
9
UNIT
V
V
CC
T
STG
Storage temperature
-65 to +150
°C
Operating ambient temperature range
T
A
NE
SA
0 to +70
-40 to +85
°C
AC/DC ELECTRICAL CHARACTERISTICS
T =25°C, V = 6V, Figure 3
A
CC
LIMITS
SYMBOL
PARAMETER
TEST CONDITION
UNIT
Min
Typ
Max
8.0
V
Power supply voltage range
DC current drain
4.5
V
CC
2.4
500
200
5.0
-13
17
3.0
mA
MHz
MHz
dB
f
f
Input signal frequency
Oscillator frequency
IN
OSC
Noise figured at 45MHz
Third-order intercept point at 45MHz
Conversion gain at 45MHz
RF input resistance
RF =-45dBm
dBm
dB
IN
14
R
C
1.5
kΩ
IN
IN
RF input capacitance
3
pF
Mixer output resistance
(Pin 4 or 5)
1.5
kΩ
radio 2nd IF and demodulator, the NE/SA612A is capable of
receiving -119dBm signals with a 12dB S/N ratio. Third-order
DESCRIPTION OF OPERATION
The NE/SA612A 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.
intercept is typically -15dBm (that’s 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 not critical, the input to the
NE/SA612A should be appropriately scaled.
The NE/SA612A is designed for optimum low power performance.
When used with the NE614A as a 45MHz cordless phone/cellular
2
1990 Sep 17
NXP [ NXP ]
