RF COMMUNICATIONS PRODUCTS
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IF |
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LIMITER |
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AMP |
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MIXER |
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RSSI |
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QUAD |
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OSCILLATOR |
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VREG |
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B |
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AUDIO |
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SA606
Low-voltage high performance mixer FM IF system
Product Specification
1997 Nov 07
Replaces data of October 26, 1993 RF Data Handbook
Philips Semiconductors
Philips Semiconductors |
Product specification |
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Low-voltage high performance mixer FM IF system |
SA606 |
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DESCRIPTION
The SA606 is a low-voltage high performance 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 SA606 is available in 20-lead SOL (surface-mounted small outline large package) and 20-lead SSOP (shrink small outline package).
The SA606 was designed for portable communication applications and will function down to 2.7V. The RF section is similar to the famous SA605. The audio and RSSI outputs have amplifiers with access to the feedback path. This enables the designer to level adjust the outputs or add filtering.
FEATURES
•Low power consumption: 3.5mA typical at 3V
•Mixer input to >150MHz
•Mixer conversion power gain of 17dB at 45MHz
•XTAL oscillator effective to 150MHz (L.C. oscillator or external oscillator can be used at higher frequencies)
•102dB of IF Amp/Limiter gain
•2MHz limiter small signal bandwidth
•Temperature compensated logarithmic Received Signal Strength Indicator (RSSI) with a 90dB dynamic range
•Low external component count; suitable for crystal/ceramic/LC filters
•Excellent sensitivity: 0.31μV into 50Ω matching network for 12dB SINAD (Signal to Noise and Distortion ratio) for 1kHz tone with RF at 45MHz and IF at 455kHz
•SA606 meets cellular radio specifications
•Audio output internal op amp
•RSSI output internal op amp
•Internal op amps with rail-to-rail outputs
PIN CONFIGURATION
D and DK Packages
RF IN+ |
1 |
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20 |
MIXER OUT |
RF INDECOUPLING |
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IF AMP DECOUPLING |
2 |
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19 |
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OSCOUT |
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IF AMP IN |
3 |
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18 |
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OSCIN |
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IF AMP DECOUPLING |
4 |
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17 |
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RSSI |
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IF AMP OUT |
5 |
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16 |
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GND |
VCC |
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15 |
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AUDIO FEEDBACK |
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LIMITER IN |
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14 |
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AUDIO |
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LIMITER DECOUPLING |
8 |
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13 |
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RSSI FEEDBACK |
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LIMITER DECOUPLING |
9 |
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12 |
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LIMITER OUT |
QUADRATURE IN |
10 |
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11 |
SR00347
Figure 1. Pin Configuration
•ESD protection: Human Body Model 2kV Robot Model 200V
APPLICATIONS
•Portable cellular radio FM IF
•Cordless phones
•Wireless systems
•RF level meter
•Spectrum analyzer
•Instrumentation
•FSK and ASK data receivers
•Log amps
•Portable high performance communication receiver
•Single conversion VHF receivers
ORDERING INFORMATION
DESCRIPTION |
TEMPERATURE RANGE |
ORDER CODE |
DWG # |
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20-Pin Plastic Small Outline Large (SOL) package (Surface-mount) |
-40 to +85°C |
SA606D |
SOT163-1 |
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20-Pin Plastic Shrink Small Outline Package (SSOP) (Surface-mount) |
-40 to +85°C |
SA606DK |
SOT266-1 |
ABSOLUTE MAXIMUM RATINGS
SYMBOL |
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PARAMETER |
RATING |
UNITS |
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VCC |
Single supply voltage |
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7 |
V |
TSTG |
Storage temperature range |
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-65 to +150 |
°C |
TA |
Operating ambient temperature range |
-40 to +85 |
°C |
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θJA |
Thermal impedance |
D package |
90 |
°C/W |
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DK package |
117 |
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1997 Nov 07 |
2 |
853-1576 18665 |
Philips Semiconductors |
Product specification |
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Low-voltage high performance mixer FM IF system |
SA606 |
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BLOCK DIAGRAM
20 |
19 |
18 |
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16 |
15 |
14 |
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12 |
11 |
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IF |
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LIMITER |
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AMP |
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MIXER |
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RSSI |
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QUAD |
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OSCILLATOR |
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+ |
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VREG |
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E |
B |
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AUDIO |
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7 |
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10 |
SR00348 |
Figure 2. Block Diagram
DC ELECTRICAL CHARACTERISTICS
VCC = +3V, |
TA = 25°C; unless otherwise stated. |
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PARAMETER |
TEST CONDITIONS |
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LIMITS |
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UNITS |
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MIN |
TYP |
MAX |
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VCC |
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Power supply voltage range |
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2.7 |
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7.0 |
V |
ICC |
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DC current drain |
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3.5 |
4.2 |
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 = 2.4kΩ and R18 = 3.3kΩ; RF level = -45dBm; FM modulation = 1kHz with ±8kHz 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 characterristics. 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 |
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LIMITS |
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UNITS |
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MIN |
TYP |
MAX |
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Mixer/Osc section (ext LO = 220mVRMS) |
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fIN |
Input signal frequency |
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150 |
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fOSC |
Crystal oscillator frequency |
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150 |
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MHz |
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Noise figure at 45MHz |
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6.2 |
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dB |
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Third-order input intercept point (50Ω |
f1 = 45.0; f2 = 45.06MHz |
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dBm |
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source) |
Input RF level = -52dBm |
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Conversion voltage gain |
Matched 14.5dBV step-up |
13.5 |
17 |
19.5 |
dB |
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50Ω source |
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dB |
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RF input resistance |
Single-ended input |
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kΩ |
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RF input capacitance |
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3.0 |
4.0 |
pF |
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Mixer output resistance |
(Pin 20) |
1.25 |
1.5 |
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kΩ |
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IF section |
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IF amp gain |
50Ω source |
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44 |
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dB |
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Limiter gain |
50Ω source |
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dB |
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Input limiting -3dB, R17a = 2.4k, R17b = 3.3k |
Test at Pin 18 |
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-109 |
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dBm |
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AM rejection |
80% AM 1kHz |
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45 |
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dB |
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Audio level |
Gain of two (2kΩ AC load) |
70 |
120 |
160 |
mV |
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SINAD sensitivity |
IF level -110dBm |
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17 |
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dB |
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1997 Nov 07 |
3 |
Philips Semiconductors |
Product specification |
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Low-voltage high performance mixer FM IF system |
SA606 |
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AC ELECTRICAL CHARACTERISTICS (Continued)
SYMBOL |
PARAMETER |
TEST CONDITIONS |
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LIMITS |
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UNITS |
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MIN |
TYP |
MAX |
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THD |
Total harmonic distortion |
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-35 |
-50 |
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dB |
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S/N |
Signal-to-noise ratio |
No modulation for noise |
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dB |
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RF RSSI output, R9 = 2kΩ |
RF level = -118dBm |
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0.3 |
.80 |
V |
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RF level = -68dBm |
.70 |
1.1 |
1.80 |
V |
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RF level = -23dBm |
1.20 |
1.8 |
2.50 |
V |
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RSSI range |
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90 |
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dB |
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RSSI accuracy |
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+1.5 |
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dB |
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IF input impedance |
Pin 18 |
1.3 |
1.5 |
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kΩ |
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IF output impedance |
Pin 16 |
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0.3 |
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kΩ |
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Limiter input impedance |
Pin 14 |
1.3 |
1.5 |
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kΩ |
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Limiter output impedance |
Pin 11 |
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0.3 |
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kΩ |
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Limiter output voltage |
Pin 11 |
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130 |
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mVRMS |
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RF/IF section (int LO) |
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Audio level |
3V = VCC, RF level = -27dBm |
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120 |
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mVRMS |
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System RSSI output |
3V = VCC, RF level = -27dBm |
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2.2 |
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V |
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System SINAD sensitivity |
RF level = -117dBm |
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12 |
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dB |
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CIRCUIT DESCRIPTION
The SA606 is an IF signal processing system suitable for second IF systems with input frequency as high as 150MHz. The bandwidth of the IF amplifier and limiter is at least 2MHz with 90dB of gain. The gain/bandwidth distribution is optimized for 455kHz, 1.5kΩ source applications. The overall system is well-suited to battery operation as well as high performance 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 6.2dB, conversion gain of 17dB, and input third-order intercept of -9dBm. The oscillator will operate in excess of 200MHz in L/C tank configurations. Hartley or Colpitts circuits can be used up to 100MHz for xtal configurations. Butler oscillators are recommended for xtal configurations up to 150MHz.
The output impedance of the mixer is a 1.5kΩ resistor permitting direct connection to a 455kHz ceramic filter. The input resistance of the limiting IF amplifiers is also 1.5kΩ. With most 455kHz ceramic filters and many crystal filters, no impedance matching network is necessary. The IF amplifier has 43dB of gain and 5.5MHz bandwidth. The IF limiter has 60dB 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 5kΩ with a rail-to-rail output.
A log signal strength completes the circuitry. The output range is greater than 90dB and is temperature compensated. This log signal strength indicator exceeds the criteria for AMPs or TACs cellular telephone. 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
1997 Nov 07 |
4 |
Philips Semiconductors |
Product specification |
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Low-voltage high performance mixer FM IF system |
SA606 |
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-25dB, -10dB, 1500/50Ω PAD 50/50Ω PAD
50.5 |
3880 
2430
C24
SW9
96.5 |
32.6 
71.5
C22
FLT1 
SW8 C23
-29dB, 929/50Ω PAD
51.5
C26
R18
3.3k
C20 |
R17 |
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2.4k |
SW7 |
C21
-10.6dB, |
-36dB, |
50/50Ω PAD |
156k/50Ω PAD |
96.5 |
32.8 
71.5
C19
SW6 |
FLT2 |
C18 |
C17 |
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51.7 |
1.3k |
C16 C15
SW5 
20 |
19 |
18 |
17 |
16 |
15 |
14 |
13 |
12 |
11 |
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IF |
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LIMITER |
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AMP |
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MIXER |
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RSSI |
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QUAD |
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OSCILLATOR |
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+ ± |
VREG |
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± + |
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AUDIO
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1 |
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6 |
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R11 |
R13 |
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SW1 |
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SW3 |
SW4 |
R9 |
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SW11 |
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C1 |
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C9 |
R10 |
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R14 |
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C8 |
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C12 |
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SW10 |
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C2 |
L1 |
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C7 |
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C27 |
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R12 |
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C5 |
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R19 |
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R4 |
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L2 |
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C10 |
DEEMPHASIS |
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IFT1 |
16k |
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SW2 |
51.1 |
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X1 |
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FILTER |
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R1 |
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C6 |
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C3 |
C4 EXT. |
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R7 |
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ºCº WEIGHTED |
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R2 |
LOC |
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30.5 |
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AUDIO |
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R3 |
OSC |
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MEASUREMENT |
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C14 |
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44.545 |
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CIRCUIT |
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R6 |
R8 |
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45MHZ |
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45.06 |
178 |
39.2 |
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MHZ |
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RSSI |
VCC |
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AUDIO |
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MINI±CIRCUIT ZSC2±1B |
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Automatic Test Circuit Component List
C1 100pF NPO Ceramic
C2 390pF NPO Ceramic
C5 100nF +10% Monolithic Ceramic
C6 22pF NPO Ceramic
C7 1nF Ceramic
C8 10.0pF NPO Ceramic
C9 100nF +10% Monolithic Ceramic
C10 10μF Tantalum (minimum) *
C12 2.2μF
C14 100nF +10% Monolithic Ceramic
C15 10pF NPO Ceramic
C17 100nF +10% Monolithic Ceramic
C18 100nF +10% Monolithic Ceramic
C21 100nF +10% Monolithic Ceramic
C23 100nF +10% Monolithic Ceramic
C25 100nF +10% Monolithic Ceramic
C26 100nF +10% Monolithic Ceramic
C27 2.2μF +10% Monolithic Ceramic
Flt 1 Ceramic Filter Murata SFG455A3 or equiv Flt 2 Ceramic Filter Murata SFG455A3 or equiv IFT 1 455kHz (Ce = 180pF) Toko RMC±2A6597H L1 147±160nH Coilcraft UNI±10/142±04J08S
L2 0.8μH nominal
Toko 292CNS±T1038Z X1 44.545MHz Crystal ICM4712701 R9 2kΩ +1% 1/4W Metal Film
R10 10kΩ +1%
R11 10kΩ +1%
R12 2kΩ +1%
R13 20kΩ +1%
R14 10kΩ +1%
R17 2.4kΩ +5% 1/4W Carbon Composition
R18 3.3kΩ
R19 16kΩ
*NOTE: This value can be reduced when a battery is the power source. |
SR00349 |
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Figure 3. SA606 45MHz Test Circuit (Relays as shown)
1997 Nov 07 |
5 |
Philips Semiconductors |
Product specification |
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Low-voltage high performance mixer FM IF system |
SA606 |
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C26 |
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R18 |
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3.3k |
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R17 |
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C15 |
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2.4k |
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FLT1 |
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FLT2 |
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C23 |
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C21 |
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C18 |
C17 |
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20 |
19 |
18 |
17 |
16 |
15 |
14 |
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12 |
11 |
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IF |
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LIMITER |
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AMP |
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MIXER |
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RSSI |
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QUAD |
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OSCILLATOR |
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+ ± |
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± + |
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VREG |
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1 |
2 |
3 |
4 |
5 |
6 |
7 |
8 |
9 |
10 |
C1 |
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R11 |
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C9 |
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10k |
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C8 |
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R10 |
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C12 |
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L1 |
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10k |
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C2 |
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C27 |
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C7 |
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C10 |
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2.2μF |
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C5 |
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R19 |
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IFT1 |
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L2 |
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11k |
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45MHz |
C6 |
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X1 |
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INPUT |
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C19 |
C14 |
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390pF |
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RSSI |
VCC |
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AUDIO |
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OUTPUT |
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NE606D/DK Demo Board
Application Component List
C1 51pF NPO Ceramic
C2 220pF NPO Ceramic
C5 100nF +10% Monolithic Ceramic
C6 5-30pF trim cap
C7 1nF Ceramic
C8 10.0pF NPO Ceramic
C9 100nF +10% Monolithic Ceramic
C10 10μF Tantalum (minimum) *
C12 2.2μF +10% Tantalum
C14 100nF +10% Monolithic Ceramic
C15 10pF NPO Ceramic
C17 100nF +10% Monolithic Ceramic
C18 100nF +10% Monolithic Ceramic
C19 390pF +10% Monolithic Ceramic
C21 100nF +10% Monolithic Ceramic
* NOTE: This value can be reduced when a battery is the power source.
C23 100nF +10% Monolithic Ceramic
C26 100nF +10% Monolithic Ceramic
C27 2.2μF Tantalum
Flt 1 Ceramic Filter Murata SFG455A3 or equiv Flt 2 Ceramic Filter Murata SFG455A3 or equiv IFT 1 330μH TOKO 303LN-1130
L1 .33μH TOKO SCB-1320Z
L2 1.2μH
X1 44.545MHz Crystal ICM4712701
R5 Not Used in Application Board (see Note 8, pg 8) R10 8.2k +5% 1/4W Carbon Composition
R11 10k +5% 1/4W Carbon Composition
R17 2.4k +5% 1/4W Carbon Composition
R18 3.3k +5% 1/4W Carbon Composition
R19 11k +5% 1/4W Carbon Composition
SR00350
Figure 4. SA606 45MHz Application Circuit
1997 Nov 07 |
6 |
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