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Part: SA602AD
Category:
Communication
-> Wireless
-> IF system
Description: SA602A; Double-balanced Mixer And Oscillator;; Package: SOT96 (SO8)
Company: Philips Semiconductors
Datasheet: Download SA602AD datasheet File size : 70 kB
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Datasheet text preview:
RF COMMUNICATIONS PRODUCTS
SA602A Double-balanced mixer and oscillator
Product specification Replaces datasheet of April 17, 1990 IC17 Data Handbook 1997 Nov 07
Philips Semiconductors
Philips Semiconductors
Product specification
Double-balanced mixer and oscillator
SA602A
DESCRIPTION
The 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 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
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)
· Cellular radio mixer/oscillator · Portable radio · VHF transceivers · RF data links · HF/VHF frequency conversion · Instrumentation frequency conversion · Broadband LANs
TEMPERATURE RANGE -40 to +85°C -40 to +85°C
ORDER CODE SA602AN SA602AD
DWG # SOT97-1 SOT96-1
ABSOLUTE MAXIMUM RATINGS
SYMBOL VCC TSTG TA JA Maximum operating voltage Storage temperature range Operating ambient temperature range SA602A Thermal impedance D package N package PARAMETER RATING 9 -65 to +150 -40 to +85 90 75 UNITS V °C °C °C/W °C/W
1997 Nov 07
2
853-1424 18662
Philips Semiconductors
Product specification
Double-balanced mixer and oscillator
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 TEST CONDITIONS MIN 4.5 2.4 500 200 5.0 -13 17 5.5 -15 SA602A TYP MAX 8.0 2.8 V mA MHz MHz dB dBm dB k pF k UNITS
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.
1997 Nov 07
3
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