RF COMMUNICATIONS PRODUCTS
20
19
18
17
16
15
14
13
12
11
IF
AMP
LIMITER
MIXER
RSSI
QUAD
OSCILLATOR
+
–
V
REG
–
+
E
B
AUDIO
1
2
3
4
5
6
7
8
9
10
SA606
Low-voltage high performance mixer FM
IF system
Product Specification
Replaces data of October 26, 1993
RF Data Handbook
1997 Nov 07
Philips Semiconductors
Philips Semiconductors
Product specification
Low-voltage high performance mixer FM IF system
SA606
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.
PIN CONFIGURATION
D and DK Packages
RF IN+
1
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
RF IN- DECOUPLING
2
OSC
OUT
OSC
IN
3
4
RSSI
5
V
CC
AUDIO FEEDBACK
AUDIO
6
7
8
9
FEATURES
RSSI FEEDBACK
•
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)
QUADRATURE IN
10
SR00347
•
ESD protection:
Figure 1. Pin Configuration
Human Body Model 2kV
Robot Model 200V
•
102dB of IF Amp/Limiter gain
•
2MHz limiter small signal bandwidth
•
Temperature compensated logarithmic Received Signal Strength
Indicator (RSSI) with a 90dB dynamic range
APPLICATIONS
•
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
ORDERING INFORMATION
DESCRIPTION
20-Pin Plastic Small Outline Large (SOL) package (Surface-mount)
20-Pin Plastic Shrink Small Outline Package (SSOP) (Surface-mount)
•
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
TEMPERATURE RANGE
-40 to +85°C
-40 to +85°C
ORDER CODE
SA606D
SA606DK
DWG #
SOT163-1
SOT266-1
ABSOLUTE MAXIMUM RATINGS
SYMBOL
V
CC
T
STG
T
A
θ
JA
Single supply voltage
Storage temperature range
Operating ambient temperature range
Thermal impedance
D package
DK package
PARAMETER
RATING
7
-65 to +150
-40 to +85
90
117
UNITS
V
°C
°C
°C/W
1997 Nov 07
2
853-1576 18665
Philips Semiconductors
Product specification
Low-voltage high performance mixer FM IF system
SA606
BLOCK DIAGRAM
20
19
18
17
16
15
14
13
12
11
IF
AMP
MIXER
RSSI
LIMITER
QUAD
OSCILLATOR
+ –
V
REG
E
B
– +
AUDIO
1
2
3
4
5
6
7
8
9
10
SR00348
Figure 2. Block Diagram
DC ELECTRICAL CHARACTERISTICS
V
CC
= +3V, T
A
= 25
°
C; unless otherwise stated.
SYMBOL
V
CC
I
CC
PARAMETER
Power supply voltage range
DC current drain
TEST CONDITIONS
LIMITS
MIN
2.7
3.5
TYP
MAX
7.0
4.2
UNITS
V
mA
AC ELECTRICAL CHARACTERISTICS
T
A
= 25°C; V
CC
= +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
LIMITS
MIN
TYP
150
150
6.2
f1 = 45.0; f2 = 45.06MHz
Input RF level = -52dBm
Matched 14.5dBV step-up
50Ω source
RF input resistance
RF input capacitance
Mixer output resistance
IF section
IF amp gain
Limiter gain
Input limiting -3dB, R
17a
= 2.4k, R
17b
= 3.3k
AM rejection
Audio level
SINAD sensitivity
50Ω source
50Ω source
Test at Pin 18
80% AM 1kHz
Gain of two (2kΩ AC load)
IF level -110dBm
70
44
58
-109
45
120
17
160
dB
dB
dBm
dB
mV
dB
(Pin 20)
1.25
Single-ended input
13.5
-9
17
+2.5
8
3.0
1.5
4.0
19.5
MAX
UNITS
Mixer/Osc section (ext LO = 220mV
RMS
)
f
IN
f
OSC
Input signal frequency
Crystal oscillator frequency
Noise figure at 45MHz
Third-order input intercept point (50Ω
source)
Conversion voltage gain
MHz
MHz
dB
dBm
dB
dB
kΩ
pF
kΩ
1997 Nov 07
3
Philips Semiconductors
Product specification
Low-voltage high performance mixer FM IF system
SA606
AC ELECTRICAL CHARACTERISTICS
SYMBOL
THD
S/N
PARAMETER
Total harmonic distortion
Signal-to-noise ratio
RF RSSI output, R
9
= 2kΩ
(Continued)
TEST CONDITIONS
LIMITS
MIN
-35
No modulation for noise
RF level = -118dBm
RF level = -68dBm
RF level = -23dBm
.70
1.20
TYP
-50
62
0.3
1.1
1.8
90
+1.5
Pin 18
Pin 16
Pin 14
Pin 11
Pin 11
3V = V
CC
, RF level = -27dBm
3V = V
CC
, RF level = -27dBm
RF level = -117dBm
1.3
1.3
1.5
0.3
1.5
0.3
130
120
2.2
12
.80
1.80
2.50
MAX
UNITS
dB
dB
V
V
V
dB
dB
kΩ
kΩ
kΩ
kΩ
mV
RMS
mV
RMS
V
dB
RSSI range
RSSI accuracy
IF input impedance
IF output impedance
Limiter input impedance
Limiter output impedance
Limiter output voltage
RF/IF section (int LO)
Audio level
System RSSI output
System SINAD sensitivity
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 V
OUT
/V
IN
1997 Nov 07
4
Philips Semiconductors
Product specification
Low-voltage high performance mixer FM IF system
SA606
-
25dB,
-
10dB,
1500/50
Ω
PAD 50/50
Ω
PAD
-
29dB,
929/50
Ω
PAD
-
10.6dB,
50/50
Ω
PAD
-
36dB,
156k/50
Ω
PAD
50.5
3880
2430
C24
SW9
96.5
71.5
51.5
C26
R18
3.3k
96.5
32.8
71.5
C19
SW6
C18
C17
51.7
32.6
1.3k
C16
SW5
C15
C20
C22
FLT1
C23
SW8
C21
SW7
R17
2.4k
FLT2
20
19
18
17
16
15
14
13
12
11
IF
AMP
MIXER
LIMITER
RSSI
QUAD
OSCILLATOR
+ –
V
REG
– +
AUDIO
1
2
3
4
5
6
7
8
R13
9
10
C1
SW1
SW3
SW4
C8
R9
C9
R10
R11
SW10
C27
C12
SW11
R14
C2
L1
C7
R4
51.1
C5
L2
C6
C3
R2
C4 EXT.
LOC
OSC
44.545
45.06
MHZ
MINI–CIRCUIT ZSC2–1B
X1
R7
30.5
R6
178
R8
39.2
RSSI
V
CC
C10
R12
R19
DEEMPHASIS
FILTER
IFT1
16k
SW2
R1
R3
”C” WEIGHTED
AUDIO
MEASUREMENT
CIRCUIT
C14
45MHZ
AUDIO
Automatic Test Circuit Component List
C1
C2
C5
C6
C7
C8
C9
C10
C12
C14
C15
C17
C18
C21
C23
C25
C26
100pF NPO Ceramic
390pF NPO Ceramic
100nF +10% Monolithic Ceramic
22pF NPO Ceramic
1nF Ceramic
10.0pF NPO Ceramic
100nF +10% Monolithic Ceramic
10
µ
F Tantalum (minimum) *
2.2µF
100nF +10% Monolithic Ceramic
10pF NPO Ceramic
100nF +10% Monolithic Ceramic
100nF +10% Monolithic Ceramic
100nF +10% Monolithic Ceramic
100nF +10% Monolithic Ceramic
100nF +10% Monolithic Ceramic
100nF +10% Monolithic Ceramic
C27
Flt 1
Flt 2
IFT 1
L1
L2
X1
R9
R10
R11
R12
R13
R14
R17
R18
R19
2.2µF +10% Monolithic Ceramic
Ceramic Filter Murata SFG455A3 or equiv
Ceramic Filter Murata SFG455A3 or equiv
455kHz (Ce = 180pF) Toko RMC–2A6597H
147–160nH Coilcraft UNI–10/142–04J08S
0.8
µ
H nominal
Toko 292CNS–T1038Z
44.545MHz Crystal ICM4712701
2kΩ +1% 1/4W Metal Film
10kΩ +1%
10kΩ +1%
2kΩ +1%
20kΩ +1%
10kΩ +1%
2.4kΩ +5% 1/4W Carbon Composition
3.3kΩ
16kΩ
SR00349
*NOTE: This value can be reduced when a battery is the power source.
Figure 3. SA606 45MHz Test Circuit (Relays as shown)
1997 Nov 07
5
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