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SA676 PDF даташит

Спецификация SA676 изготовлена ​​​​«Philips» и имеет функцию, называемую «Low-voltage mixer FM IF system».

Детали детали

Номер произв SA676
Описание Low-voltage mixer FM IF system
Производители Philips
логотип Philips логотип 

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SA676 Даташит, Описание, Даташиты
Philips Semiconductors
Low-voltage mixer FM IF system
Product specification
SA676
DESCRIPTION
The SA676 is a low-voltage monolithic FM IF system incorporating a
mixer/oscillator, two limiting intermediate frequency amplifiers,
quadrature detector, logarithmic received signal strength indicator
(RSSI), voltage regulator and audio and RSSI op amps. The SA676
is available in a 20-pin SSOP (shrink small outline package).
The SA676 was designed for cordless telephone applications in
which efficient and economic integrated solutions are required and
yet high performance is desirable. Although the product is not
targeted to meet the stringent specifications of high performance
cellular equipment, it will exceed the needs for analog cordless
phones. The minimal amount of external components and absence
of any external adjustments makes for a very economical solution.
FEATURES
Low power consumption: 3.5mA typical at 3V
Mixer input to >100MHz
Mixer conversion power gain of 17dB at 45MHz
XTAL oscillator effective to 100MHz (L.C. oscillator or external
oscillator can be used at higher frequencies)
102dB of IF Amp/Limiter gain
2MHz IF amp/limiter small signal bandwidth
Temperature compensated logarithmic Received Signal Strength
Indicator (RSSI) with a 70dB dynamic range
Low external component count; suitable for crystal/ceramic/LC
filters
PIN CONFIGURATION
DK Package
RF IN+ 1
RF IN– DECOUPLING 2
OSCOUT 3
OSCIN 4
RSSI OUT 5
VCC 6
AUDIO FEEDBACK 7
AUDIO OUT 8
RSSI FEEDBACK 9
QUADRATURE IN 10
20 MIXER OUT
19 IF AMP DECOUPLING
18 IF AMP IN
17 IF AMP DECOUPLING
16 IF AMP OUT
15 GND
14 LIMITER IN
13 LIMITER DECOUPLING
12 LIMITER DECOUPLING
11 LIMITER OUT
Figure 1. Pin Configuration
SR00514
Audio output internal op amp
RSSI output internal op amp
Internal op amps with rail-to-rail outputs
ESD protection: Human Body Model 2kV
Robot Model 200V
APPLICATION
Cordless phones
ORDERING INFORMATION
DESCRIPTION
20-Pin Plastic Shrink Small Outline Package (Surface-mount)
TEMPERATURE RANGE
-40 to +85°C
ORDER CODE
SA676DK
DWG #
SOT266-1
BLOCK DIAGRAM
20 19 18 17 16 15 14 13 12 11
MIXER
IF
AMP
OSCILLATOR
RSSI
LIMITER
QUAD
+–
VREG
–+
EB
AUDIO
123 456 789
Figure 2. Block Diagram
10
SR00515
1993 Dec 15
6–129
853-1726 11659









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SA676 Даташит, Описание, Даташиты
Philips Semiconductors
Low-voltage mixer FM IF system
Product specification
SA676
ABSOLUTE MAXIMUM RATINGS
SYMBOL
PARAMETER
VCC
TSTG
TA
θJA
Single supply voltage
Storage temperature range
Operating ambient temperature range
Thermal impedance
DK package
RATING
7
–65 to +150
–40 to +85
117
UNITS
V
°C
°C
°C/W
DC ELECTRICAL CHARACTERISTICS
VCC = +3V, TA = 25°C; unless otherwise stated.
SYMBOL
PARAMETER
VCC Power supply voltage range
ICC DC current drain
TEST CONDITIONS
LIMITS
SA676
MIN TYP MAX
2.7 7.0
3.5 5.0
UNITS
V
mA
AC ELECTRICAL CHARACTERISTICS
TA = 25°C; VCC = +3V, unless otherwise stated. RF frequency = 45MHz; +14.5dBV RF input step-up; IF frequency = 455kHz; R17 = 2.4k
and R18 = 3.3k; RF level = –45dBm; FM modulation = 1kHz with ±5kHz peak deviation. Audio output with de-emphasis filter and C-message
weighted filter. Test circuit Figure 3. The parameters listed below are tested using automatic test equipment to assure consistent electrical
characteristics. The limits do not represent the ultimate performance limits of the device. Use of an optimized RF layout will improve many of
the listed parameters.
SYMBOL
PARAMETER
TEST CONDITIONS
LIMITS
MIN TYP MAX
UNITS
Mixer/Osc section (ext LO = 220mVRMS)
fIN Input signal frequency
fOSC
Crystal oscillator frequency
Noise figure at 45MHz
100 MHz
100 MHz
7.0 dB
Third–order input intercept point (50
source)
f1 = 45.0; f2 = 45.06MHz
Input RF level = –52dBm
–10 dBm
Conversion power gain
Matched 14.5dBV step–up
10 17
dB
50source
+2.5
dB
RF input resistance
Single–ended input
8 k
RF input capacitance
3.0 4.0
pF
Mixer output resistance
(Pin 20)
1.25 1.5
k
IF section
IF amp gain
50source
44 dB
Limiter gain
50source
58 dB
AM rejection
30% AM 1kHz
50 dB
Audio level
Gain of two
60 120
mV
SINAD sensitivity
IF level –110dBm
17 dB
THD Total harmonic distortion
–55 dB
S/N Signal–to–noise ratio
IF RSSI output, R9 = 2k1
No modulation for noise
IF level = –110dBm
IF level = –50dBm
60
0.5 .90
1.7 2.2
dB
V
V
RSSI range
70 dB
IF input impedance
Pin 18
1.3 1.5
k
IF output impedance
Pin 16
0.3 k
Limiter input impedance
Pin 14
1.3 1.5
k
Limiter output impedance
Pin 11
0.3 k
Limiter output voltage
Pin 11
130 mVRMS
1993 Dec 15
6–130









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SA676 Даташит, Описание, Даташиты
Philips Semiconductors
Low-voltage mixer FM IF system
Product specification
SA676
AC ELECTRICAL CHARACTERISTICS (Continued)
SYMBOL
PARAMETER
RF/IF section (int LO)
System SINAD sensitivity
TEST CONDITIONS
RF level = –114dBm
LIMITS
MIN TYP MAX
UNITS
12 dB
NOTE:
1. The generator source impedance is 50, but the SA676 input impedance at Pin 18 is 1500. As a result, IF level refers to the actual signal
that enters the SA676 input (Pin 18) which is about 21dB less than the “available power” at the generator.
CIRCUIT DESCRIPTION
The SA676 is an IF signal processing system suitable for second IF
systems with input frequency as high as 100MHz. The bandwidth of
the IF amplifier and limiter is at least 2MHz with 90dB of gain. The
gain/bandwidth distribution is optimized for 455kHz, 1.5ksource
applications. The overall system is well-suited to battery operation
as well as and high quality products of all types.
The input stage is a Gilbert cell mixer with oscillator. Typical mixer
characteristics include a noise figure of 7.0dB, conversion gain of
17dB, and input third-order intercept of –10dBm. The oscillator will
operate in excess of 100MHz in L/C tank configurations. Hartley or
Colpitts circuits can be used up to 100MHz for xtal configurations.
The output impedance of the mixer is a 1.5kresistor permitting
direct connection to a 455kHz ceramic filter. The input resistance of
the limiting IF amplifiers is also 1.5k. With most 455kHz ceramic
filters and many crystal filters, no impedance matching network is
necessary. The IF amplifier has 44dB of gain and 5.5MHz
bandwidth. The IF limiter has 58dB of gain and 4.5MHz bandwidth.
To achieve optimum linearity of the log signal strength indicator,
there must be a 12dB(v) insertion loss between the first and second
IF stages. If the IF filter or interstage network does not cause
12dB(v) insertion loss, a fixed or variable resistor or an L pad for
simultaneous loss and impedance matching can be added between
the first IF output (Pin 16) and the interstage network. The overall
gain will then be 90dB with 2MHz bandwidth.
The signal from the second limiting amplifier goes to a Gilbert cell
quadrature detector. One port of the Gilbert cell is internally driven
by the IF. The other output of the IF is AC-coupled to a tuned
quadrature network. This signal, which now has a 90° phase
relationship to the internal signal, drives the other port of the
multiplier cell.
The demodulated output of the quadrature drives an internal op
amp. This op amp can be configured as a unity gain buffer, or for
simultaneous gain, filtering, and 2nd-order temperature
compensation if needed. It can drive an AC load as low as 10k
with a rail-to-rail output.
A log signal strength indicator completes the circuitry. The output
range is greater than 70dB and is temperature compensated. This
signal drives an internal op amp. The op amp is capable of
rail-to-rail output. It can be used for gain, filtering, or 2nd-order
temperature compensation of the RSSI, if needed.
NOTE: dB(v) = 20log VOUT/VIN
1993 Dec 15
6–131










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Номер в каталогеОписаниеПроизводители
SA676Low-voltage mixer FM IF systemPhilips
Philips
SA676DKLow-voltage mixer FM IF systemPhilips
Philips

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