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Details, datasheet, quote on part number:NE602AN
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Datasheet text preview:
Philips Semiconductors
Product specification
Double-balanced mixer and oscillator
NE/SA602A
DESCRIPTION
The NE/SA602A 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 guaranteed parameters of the SA602A make this device particularly well suited for cellular radio applications. The mixer is a "Gilbert cell" multiplier configuration which typically provides 18dB of 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 LO. For higher frequencies the LO input may be externally driven. The noise figure at 45MHz is typically less than 5dB. The gain, intercept performance, low-power and noise characteristics make the NE/SA602A a superior choice for high-performance battery operated equipment. It is available in an 8-lead dual in-line plastic package and an 8-lead SO (surface-mount miniature package).
PIN CONFIGURATION
F, D and N Packages
1 2 3 4 8 7 6 5
INA INB GND OUTA
V CC OSCE OSCB OUTB
SR00068
Figure 1. Pin Configuration
APPLICATIONS
FEATURES
· Low current consumption: 2.4mA typical · Excellent noise figure: <4.7dB typical at 45MHz · High operating frequency · Excellent gain, intercept and sensitivity · Low external parts count; suitable for crystal/ceramic filters · SA602A meets cellular radio specifications
ORDERING INFORMATION
DESCRIPTION 8-Pin Plastic Dual In-Line Plastic (DIP) 8-Pin Plastic Small Outline (SO) package (Surface-mount) 8-Pin Ceramic Dual In-Line Package (Cerdip) 8-Pin Plastic Dual In-Line Plastic (DIP) 8-Pin Plastic Small Outline (SO) package (Surface-mount) 8-Pin Ceramic Dual In-Line Package (Cerdip)
· Cellular radio mixer/oscillator · Portable radio · VHF transceivers · RF data links · HF/VHF frequency conversion · Instrumentation frequency conversion · Broadband LANs
TEMPERATURE RANGE 0 to +70°C 0 to +70°C 0 to +70°C -40 to +85°C -40 to +85°C -40 to +85°C
ORDER CODE NE602AN NE602AD NE602AFE SA602AN SA602AD SA602AFE
DWG # SOT97-1 SOT96-1 0580A SOT97-1 SOT96-1 0580A
ABSOLUTE MAXIMUM RATINGS
SYMBOL VCC TSTG TA JA Maximum operating voltage Storage temperature range Operating ambient temperature range NE602A SA602A Thermal impedance D package N package PARAMETER RATING 9 -65 to +150 0 to +70 -40 to +85 90 75 UNITS V °C °C °C °C/W °C/W
1990 Apr 17
127
853-1424 99374
Philips Semiconductors
Product specification
Double-balanced mixer and oscillator
NE/SA602A
BLOCK DIAGRAM
8
V CC VOLTAGE REGULATOR
7
6
5
OSCILLATOR
GROUND
1
2
3
4
SR00069
Figure 2. Block Diagram
AC/DC ELECTRICAL CHARACTERISTICS
VCC = +6V, TA = 25°C; unless otherwise stated. LIMITS SYMBOL VCC fIN fOSC PARAMETER Power supply voltage range DC current drain Input signal frequency Oscillator frequency Noise figure at 45MHz Third-order intercept point Conversion gain at 45MHz RIN CIN RF input resistance RF input capacitance Mixer output resistance (Pin 4 or 5) RFIN = -45dBm: f1 = 45.0MHz f2 = 45.06MHz 14 1.5 3 1.5 3.5 CONDITIONS TEST CONDITIONS MIN 4.5 2.4 500 200 5.0 -13 17 5.5 -15 NE/SA602A TYP MAX 8.0 2.8 V mA MHz MHz dB dBm dB k pF k UNITS
DESCRIPTION OF OPERATION
The NE/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 NE/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 NE602A should be appropriately scaled.
Besides excellent low power performance well into VHF, the NE/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.
1990 Apr 17
128
Philips Semiconductors
Product specification
Double-balanced mixer and oscillator
NE/SA602A
The oscillator is capable of sustaining oscillation beyond 200MHz in crystal or tuned tank configurations. The upper limit of operation is determined by tank "Q" and required drive levels. The higher the "Q" of the tank or the smaller the required drive, the higher the permissible oscillation frequency. If the required LO is beyond oscillation limits, or the system calls for an external LO, the external signal can be injected at Pin 6 through a DC blocking capacitor. External LO should be at least 200mVP-P. Figure 7 shows several proven oscillator circuits. Figure 7a is appropriate for cellular radio. As shown, an overtone mode of operation is utilized. Capacitor C3 and inductor L1 suppress oscillation at the crystal fundamental frequency. In the fundamental mode, the suppression network is omitted. Figure 8 shows a Colpitts varactor tuned tank oscillator suitable for synthesizer-controlled applications. It is important to buffer the
output of this circuit to assure that switching spikes from the first counter or prescaler do not end up in the oscillator spectrum. The dual-gate MOSFET provides optimum isolation with low current. The FET offers good isolation, simplicity, and low current, while the bipolar transistors provide the simple solution for non-critical applications. The resistive divider in the emitter-follower circuit should be chosen to provide the minimum input signal which will assure correct system operation. When operated above 100MHz, the oscillator may not start if the Q of the tank is too low. A 22k resistor from Pin 7 to ground will increase the DC bias current of the oscillator transistor. This improves the AC operating characteristic of the transistor and should help the oscillator to start. A 22k resistor will not upset the other DC biasing internal to the device, but smaller resistance values should be avoided.
0.5 to 1.3µH 22pF 5.5µH V CC 6.8µF 100nF 10nF 1nF 10pF 34.545MHz THIRD OVERTONE CRYSTAL
8
7
6
5
150pF OUTPUT
602A
1.5 to 44.2µH 330pF
120pF
1
47pF INPUT 220pF 100nF 0.209 to 0.283µH
2
3
4
SR00070
Figure 3. Test Configuration
1990 Apr 17
129
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