[QRP Tech Note Series de NA5N]
DATA SHEET: NE602/SA602 DOUBLE BALANCED MIXER AND OSCILLATOR
-------------------------------------------------------------------
Manufactured by Signetics (Info from Signetics Data Book, pg. 4-69+)
[The NE602 was designed initially for the wireless telephone industry.
Some information from the data sheets not applicable to QRP or general
HF work is omitted. -NA5N]
-------------------------------------------------------------------
** PIN-OUT ** **FEATURES
______ * Low current, 2.4mA typical
INPUT A --(1)-| |-(8)-- Vcc * Excellent noise figure <5dB
INPUT B --(2)-| |-(7)-- OSC. OUT * Excellent gain, intercept
GND --(3)-| |-(6)-- OSC. IN and sensitivity
OUTPUT A --(4)-| |-(5)-- OUTPUT B * Low external parts count
------
NE602N: 8-pin plastic DIP for 0 to 70C **APPLICATIONS
SA602N: 8-pin plastic DIP for -40 to 85C * Mixer/Oscillator
NE602F: 8-pin ceramic DIP for 0 to 70C * Portable radio/transceivers
* HF/VHF frequency conversion
**DESCRIPTION
The SA/NE602 is a low-power VHF monolithic double-balanced mixer with
input amplifier, on-board oscillator, and voltage regulator. It is
intended for high performance, low power communication systems. The
mixer is a "Gilbert Cell" multiplier configuration which typically
provides +18dB gain at 45MHz. The oscillator will operate to 200MHz.
It can be configured as a crystal oscillator, a tuned tank oscillator or
a buffer for an external L.O. The noise figure at 45MHz is typically
less than 5dB. The gain, intercept performance, low-power and noise
characteristics make the SA/NE602 a superior design choice for high-
performance battery operated equipment.
-------------------------------------------------------------------
**ABSOLUTE MAXIMUM RATINGS
Vcc Max. operating voltage 9 vdc
Tstg Storage temperature -65C to +150C
Ta Operating temperature range
NE602 0C to +70C (degrees)
SA602 -40C to +85C
-------------------------------------------------------------------
**AC/DC ELECTRICAL CHARACTERISTICS at Ta=25C, Vcc=6v
Vcc Power supply voltage range 4.5v (min) to 8.0v (max)
DC current drain 2.4mA(typ) to 2.8mA(max)
Fin Input signal frequency 500MHz (typical)
Fosc Oscillator frequency 200MHz (typical)
Noise figure at 45MHz 5.0dB(typ) to 6.0db(max)
Conversion gain at 45MHz 14dB (min) 18dB(typ)
Rin RF input resistance 1.5K (min)
Cin RF input capacitance 3pF (typ) to 3.5pF (max)
Ro Mixer Output resistance 1.5K (typ) (pins 4 or 5)
-------------------------------------------------------------------
The SA602 is capable of receiving -119dBm signals with a 12dB S/N ratio
at 45MHz in cellular telephone applications.
[Lab tests shows the NE602 is ~-122dBm @7mHz; -118dBm @10.1MHz -NA5N]
**DESIGN NOTES (From data sheet and personal experience)
1. RF inputs (pins 1,2) are biased internally; they are symmetrical and
can be used interchangeably, but do not bias externally. [AC coupled
only or from LC tuned circuit or transformer].
2. Mixer outputs (pins 4,5) also internally biased, connected to Vcc
through internal 1.5K resistors. [They can thus be used as single
ended output without upsetting the balance of the mixer].
3. Oscillator capable of sustaining oscillation beyond 200MHz in
crystal or tuned tank circuits. [External L.O. injection should be
at least 200mV, such as for the TX mixer or BFO for a product det.]
4. [When stealing oscillator power from pin 7 to another circuit, an
FET or transistor buffer should be used for minimum loading and
isolation].
5. [In early 1995, single unit costs from mail order vendors for a
NE602N was about $3.00 each].
Update ... in 1997, $2.25-2.50 seems to be the average price.
-------------------------------------------------------------------
72/73 de NA5N (pharden@nrao.edu)
[
QRP-L Archive |
]
[
1993 |
1994 |
1995 |
1996 |
1997 |
1998 |
1999 |
2000
]