SA612 PDF даташит
Спецификация SA612 изготовлена «Philips» и имеет функцию, называемую «Double-balanced mixer and oscillator». |
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Детали детали
Номер произв | SA612 |
Описание | Double-balanced mixer and oscillator |
Производители | Philips |
логотип |
12 Pages
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RF COMMUNICATIONS PRODUCTS
SA612A
Double-balanced mixer and oscillator
Product specification
Replaces data of September 17, 1990
IC17 Data Handbook
1997 Nov 07
Philips Semiconductors
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Philips Semiconductors
Double-balanced mixer and oscillator
Product specification
SA612A
DESCRIPTION
The SA612A is a low-power VHF monolithic double-balanced mixer
with on-board oscillator and voltage regulator. It is intended for low
cost, low power communication systems with signal frequencies to
500MHz and local oscillator frequencies as high as 200MHz. The
mixer is a “Gilbert cell” multiplier configuration which provides gain
of 14dB or more at 45MHz.
The oscillator can be configured for a crystal, a tuned tank
operation, or as a buffer for an external L.O. Noise figure at 45MHz
is typically below 6dB and makes the device well suited for high
performance cordless phone/cellular radio. The low power
consumption makes the SA612A excellent for battery operated
equipment. Networking and other communications products can
benefit from very low radiated energy levels within systems. The
SA612A is available in an 8-lead dual in-line plastic package and an
8-lead SO (surface mounted miniature package).
FEATURES
• Low current consumption
• Low cost
• Operation to 500MHz
• Low radiated energy
• Low external parts count; suitable for crystal/ceramic filter
• Excellent sensitivity, gain, and noise figure
ORDERING INFORMATION
DESCRIPTION
8-Pin Plastic Dual In-Line Plastic (DIP)
8-Pin Plastic Small Outline (SO) package (Surface-Mount)
PIN CONFIGURATION
D, N Packages
INPUT A 1
INPUT B 2
GND 3
OUTPUT A 4
8 VCC
7 OSCILLATOR
6 OSCILLATOR
5 OUTPUT B
Figure 1. Pin Configuration
SR00098
APPLICATIONS
• Cordless telephone
• Portable radio
• VHF transceivers
• RF data links
• Sonabuoys
• Communications receivers
• Broadband LANs
• HF and VHF frequency conversion
• Cellular radio mixer/oscillator
TEMPERATURE RANGE
-40 to +85°C
-40 to +85°C
ORDER CODE
SA612AN
SA612AD
DWG #
SOT97-1
SOT96-1
BLOCK DIAGRAM
8
VCC
VOLTAGE
REGULATOR
76
OSCILLATOR
5
1997 Nov 07
GROUND
1234
Figure 2. Block Diagram
2
SR00099
853-0391 18662
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Philips Semiconductors
Double-balanced mixer and oscillator
Product specification
SA612A
ABSOLUTE MAXIMUM RATINGS
SYMBOL
PARAMETER
VCC
TSTG
TA
Maximum operating voltage
Storage temperature
Operating ambient temperature range SA612A
RATING
9
-65 to +150
-40 to +85
UNIT
V
°C
°C
AC/DC ELECTRICAL CHARACTERISTICS
TA=25°C, VCC = 6V, Figure 3
SYMBOL
PARAMETER
VCC
fIN
fOSC
RIN
CIN
Power supply voltage range
DC current drain
Input signal frequency
Oscillator frequency
Noise figured at 45MHz
Third-order intercept point at 45MHz
Conversion gain at 45MHz
RF input resistance
RF input capacitance
Mixer output resistance
DESCRIPTION OF OPERATION
The 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.
The SA612A is designed for optimum low power performance.
When used with the SA614A as a 45MHz cordless phone/cellular
TEST CONDITION
RFIN=-45dBm
(Pin 4 or 5)
LIMITS
Min Typ Max
4.5 8.0
2.4 3.0
500
200
5.0
-13
14 17
1.5
3
1.5
UNIT
V
mA
MHz
MHz
dB
dBm
dB
kΩ
pF
kΩ
radio 2nd IF and demodulator, the SA612A is capable of receiving
-119dBm signals with a 12dB S/N ratio. Third-order 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 SA612A should be
appropriately scaled.
1997 Nov 07
3
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