SA608D [NXP]
Low voltage high performance mixer FM IF system; 低电压高性能混频器FM IF系统
| 型号： | SA608D |
| 厂家： | 
NXP |
| 描述： | Low voltage high performance mixer FM IF system |
| 文件： | 总14页 (文件大小：180K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
Philips Semiconductors RF Communications Products
Product specification
Low voltage high performance mixer FM IF system
SA608
DESCRIPTION
PIN CONFIGURATION
• Low external component count; suitable for
The SA608 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 SA608 is available in 20-lead
dual-in-line plastic, 20-lead SOL
crystal/ceramic/LC filters
D, DK and N Packages
• Excellent sensitivity: 0.31µV into 50Ω
matching network for 12dB SINAD (Signal
to Noise and Distortion ratio) for 1kHz tone,
8kHz deviation with RF at 45MHz and IF at
455kHz
1
RF IN+
20 MIXER OUT
IF AMP
DECOUPLING
RF IN–
DECOUPLING
2
3
4
5
6
7
8
19
18 IF AMP IN
OSC-
OUT
• SA608 meets cellular radio specifications
• Audio output internal op amp
IF AMP
17
(surface-mounted miniature package) and
20-lead SSOP package.
OSC
IN
DECOUPLING
16 IF AMP OUT
15 GND
RSSI
• RSSI output internal op amp
The SA608 was designed for portable
V
CC
communication applications and will function
down to 2.7V. The RF section is similar to
the famous NE605. The audio output is
buffered. The RSSI output has an internal
amplifier with the feedback pin accessible.
The SA608 also has an extra limiter output.
This signal is buffered from the output of the
limiter and can be used to perform frequency
check. This is accomplished by comparing a
reference frequency with the frequency check
signal using a comparator to a varactor or
PLL at the oscillator inputs.
• Buffered frequency check output
• Internal op amps with rail-to-rail outputs
14 LIMITER IN
AUDIO
LIMITER
13
RSSI
FEEDBACK
DECOUPLING
LIMITER
12
FREQ CHECK/
LIM OUT (–)
9
• ESD protection: Human Body Model 2kV
DECOUPLING
Robot Model 200V
11
10
LIMITER
OUT (+)
QUADRATURE
IN
APPLICATIONS
• Portable cellular radio FM IF
• Cordless phones
• Narrow band cellular applications
(NAMPS/NTACS)
FEATURES
• RF level meter
• Low power consumption: 3.5mA typical at
• Spectrum analyzer
• Instrumentation
3V
• Mixer input to >150MHz
• FSK and ASK data receivers
• Log amps
• 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)
• Portable high performance communication
receivers
• Single conversion VHF receivers
• Wireless systems
• 102dB of IF Amp/Limiter gain
• 2MHz limiter small signal bandwidth
• Temperature compensated logarithmic
Received Signal Strength Indicator (RSSI)
with a 90dB dynamic range
ORDERING INFORMATION
DESCRIPTION
TEMPERATURE RANGE
ORDER CODE
SA608N
DWG #
0408B
0172D
1563
20-Pin Plastic Dual In-Line Package (DIP)
20-Pin Plastic Small Outline Large (SOL) package (Surface-mount)
20-Pin Plastic Shrink Small Outline Package (SSOP) (Surface-mount)
-40 to +85°C
-40 to +85°C
-40 to +85°C
SA608D
SA608DK
2
November 3, 1992
853-1679 08108
Philips Semiconductors RF Communications Products
Product specification
Low voltage high performance mixer FM IF system
SA608
BLOCK DIAGRAM
20
19
18
17
16
15
14
13
12
11
IF
AMP
LIMITER
RSSI
MIXER
QUAD
OSCILLATOR
+
–
–
+
V
REG
E
B
AUDIO
1
2
3
4
5
6
7
8
9
10
ABSOLUTE MAXIMUM RATINGS
SYMBOL
PARAMETER
Single supply voltage
Storage temperature range
Operating ambient temperature range SA608
RATING
UNITS
V
CC
7
V
°C
°C
T
STG
–65 to +150
–40 to +85
T
A
Thermal impedance
D package
DK package
N package
90
117
75
θ
°C/W
JA
DC ELECTRICAL CHARACTERISTICS
V
CC
= +3V, T = 25°C; unless otherwise stated.
A
LIMITS
SA608
TYP
SYMBOL
PARAMETER
TEST CONDITIONS
UNITS
MAX
MIN
2.7
V
CC
Power supply voltage range
DC current drain
7.0
4.2
V
I
3.5
mA
CC
3
November 3, 1992
Philips Semiconductors RF Communications Products
Product specification
Low voltage high performance mixer FM IF system
SA608
AC ELECTRICAL CHARACTERISTICS
T = 25°C; V = +3V, unless otherwise stated. RF frequency = 45MHz + 14.5dBV RF input step-up; IF frequency = 455kHz; R17 = 2.4k; R18
A
CC
= 3.3k; RF level = –45dBm; FM modulation = 1kHz with ±8kHz peak deviation. Audio output with de-emphasis filter and C-message weighted
filter. Test circuit 1. 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.
LIMITS
SYMBOL
PARAMETER
TEST CONDITIONS
SA608
TYP
UNITS
MIN
MAX
Mixer/Osc section (ext LO = 220mV
)
RMS
f
Input signal frequency
150
150
6.2
MHz
MHz
dB
IN
f
Crystal oscillator frequency
Noise figure at 45MHz
OSC
Third–order input intercept point (50Ω
source)
f1 = 45.0; f2 = 45.06MHz
Input RF Level = –52dBm
–9
dBm
Conversion power gain
Matched 14.5dBV step–up
50Ω source
13.5
1.25
17
+2.5
8
19.5
4.0
dB
dB
kΩ
pF
kΩ
RF input resistance
RF input capacitance
Mixer output resistance
Single–ended input
3.0
1.5
(Pin 20)
IF section
IF amp gain
Limiter gain
50Ω source
44
58
dB
dB
dBm
dB
mV
dB
dB
dB
V
50Ω source
Input limiting –3dB, R = 2.4k
Test at Pin 18
80% AM 1kHz
–109
45
17
AM rejection
2
Audio level
35
60
80
SINAD sensitivity
RF level –110dB
17
THD
S/N
Total harmonic distortion
–35
–50
62
Signal–to–noise ratio
No modulation for noise
IF level = –118dBm
IF level = –68dBm
IF level = –23dBm
1
IF RSSI output, R = 2kΩ
0.3
1.1
1.8
90
0.8
1.80
2.5
9
.70
1.2
V
V
RSSI range
dB
dB
kΩ
kΩ
kΩ
Ω
RSSI accuracy
+1.5
1.5
0.3
1.5
200
IF input impedance
IF output impedance
Limiter input impedance
Limiter output impedance
1.3
1.30
(Pin 11)
(Pin 11) no load
130
115
Limiter output level
mV
RMS
5kΩ load
Frequency check/lim (–) output impedance
Frequency check/lim (–) output level
(Pin 9)
200
Ω
(Pin 9)
no load
5kΩ load
130
115
mV
RMS
RF/IF section (int LO)
Audio level
3V = V , RF level = –27dBm
120
2.2
12
mV
CC
RMS
System RSSI output
System SINAD sensitivity
3V = V , RF level = –27dBm
V
CC
RF level = –117dBm
dB
NOTE:
1. The generator source impedance is 50Ω, but the SA608 input impedance at Pin 18 is 1500Ω. As a result, IF level refers to the actual signal
that enters the SA608 input (Pin 18) which is about 21dB less than the “available power” at the generator.
2. By using 45kΩ load across the Quad detector coil, you will have Audio output at 115mV with –42dB distortion.
4
November 3, 1992
Philips Semiconductors RF Communications Products
Product specification
Low voltage high performance mixer FM IF system
SA608
With most 455kHz ceramic filters and many
The demodulated output of the quadrature
drives an internal op amp. This op amp is
configured as a unity gain buffer.
CIRCUIT DESCRIPTION
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
The SA608 is an IF signal processing system
suitable for second IF systems with input fre-
quency as high as 150MHz. The bandwidth
of the IF amplifier and limiter is at least 2MHz
with 90dB of gain. The gain/bandwidth dis-
tribution 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.
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 is buffered through an internal unity
gain op amp. The frequency check pin
provides a buffered limiter output. This is
useful for implementing an AFC (Automatic
Frequency Check) function. This same
output can also be used in conjunction with
limiter output (Pin 11) for demodulating FSK
(Frequency Shift Keying) data. Both pins are
of the same amplitude, but 180° out of phase.
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.
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
NOTE: Limiter or Frequency Check output
has drive capability of a 5kΩ minimum or
higher in order to obtain 120mV
level.
output
RMS
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 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.
NOTE: dB(v) = 20log V /V
OUT IN
5
November 3, 1992
Philips Semiconductors RF Communications Products
Product specification
Low voltage high performance mixer FM IF system
SA608
–25dB,
–10dB,
–29dB,
929/50Ω PAD
–10.6dB,
50/50Ω PAD
–36dB,
156k/50Ω PAD
1500/50Ω PAD 50/50Ω PAD
51.5
96.5
51.7
96.5
32.6
C26
50.5
R18
3.3k
71.5
32.8
2430
C24
71.5
C22
1.3k
3880
C20
R17
2.4k
C15
C19
C16
SW9
FLT1 SW8
C23
SW7
SW6
FLT2
SW5
C18
C21
C17
20
19
18
17
16
15
14
13
12
11
IF
AMP
LIMITER
MIXER
RSSI
QUAD
OSCILLATOR
+
–
+
–
V
REG
1
2
3
4
5
6
7
8
9
10
R10
R9
R11
SW1
L1
SW3
SW4
C8
C1
C2
C9
SW11
C12
C7
R19
16k
C5
C6
C10
R4
51.1
DEEMPHASIS
FILTER
IFT1
L2
SW2
X1
R1
C4
C3
R2
EXT.
LOC
R7
30.5
”C” WEIGHTED
AUDIO
OSC
R3
45MHZ
MEASUREMENT
CIRCUIT
C14
44.545
R8
39.2
R6
178
45.06
MHZ
FREQ
CHECK
AUDIO
V
CC
MINI–CIRCUIT ZSC2–1B
Automatic Test Circuit Component List
C1 100pF NPO Ceramic
C2 390pF NPO Ceramic
C26
C27
0.1µF +10% Monolithic Ceramic
2.2µF
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
C5
100nF +10% Monolithic Ceramic
C6 22pF NPO Ceramic
C7 1nF Ceramic
C8 10.0pF NPO Ceramic
L2
0.8µH nominal
Toko 292CNS–T1038Z
X1 44.545MHz Crystal ICM4712701
C9
100nF +10% Monolithic Ceramic
C10
C12
C14
10µF Tantalum (minimum) *
2.2µF
100nF +10% Monolithic Ceramic
R9
R10
R11
R14
R17
R18
R19
2kΩ +1% 1/4W Metal Film
10kΩ +1%
10kΩ +1%
C15 10pF NPO Ceramic
C17
100nF +10% Monolithic Ceramic
5kΩ +1%
C18
C21
C23
C25
100nF +10% Monolithic Ceramic
100nF +10% Monolithic Ceramic
100nF +10% Monolithic Ceramic
100nF +10% Monolithic Ceramic
2.4kΩ +5% 1/4W Carbon Composition
3.3kΩ +5% 1/4W Carbon Composition
16kΩ +5% 1/4W Carbon Composition
*NOTE: This value can be reduced when a battery is the power source.
Figure 1. SA607 45MHz Test Circuit (Relays as shown)
6
November 3, 1992
Philips Semiconductors RF Communications Products
Product specification
Low voltage high performance mixer FM IF system
SA608
C26
R18
3.3k
R17
2.4k
C15
FLT1 SW8
C23
FLT2
C18
C21
C17
20
19
18
17
16
15
14
13
12
11
IF
AMP
LIMITER
MIXER
RSSI
QUAD
OSCILLATOR
+
–
+
–
V
REG
1
2
3
4
5
6
7
8
9
10
C1
C2
C9
C8
C12
L1
C7
R19
11k
C19
390pF
C5
C10
IFT1
L2
X1
C6
C14
RSSI
OUTPUT
AUDIO
OUT
FREQ
CHECK
V
CC
Product Board SA608D/DK Component List
C1 51pF NPO Ceramic
C2 220pF NPO Ceramic
C25
C26
C27
100nF +10% Monolithic Ceramic
0.1µF +10% Monolithic Ceramic
2.2µF
C5
100nF +10% Monolithic Ceramic
Flt 1 Ceramic Filter Murata SFG455A3 or equiv
Flt 2 Ceramic Filter Murata SFG455A3 or equiv
IFT 1
L1
L2
C6 5-30pF NPO Ceramic
C7 1nF Ceramic
C8 10.0pF NPO Ceramic
330µH TOKO 303LN–1130
0.33µH TOKO SCB–1320Z
1.2µH Coilcraft 1008CS–122
C9
100nF +10% Monolithic Ceramic
C10
C12
C14
10µF Tantalum (minimum) *
2.2µF
100nF +10% Monolithic Ceramic
X1 44.545MHz Crystal Hy-Q
R9
R10
R11
R14
R17
R18
R19
2kΩ +1% 1/4W Metal Film
8.2kΩ +1%
10kΩ +1%
C15 10pF NPO Ceramic
C17
100nF +10% Monolithic Ceramic
10kΩ +1%
C18
C19
C21
C23
100nF +10% Monolithic Ceramic
390pF +10% Monolithic Ceramic
100nF +10% Monolithic Ceramic
100nF +10% Monolithic Ceramic
2.4kΩ +5% 1/4W Carbon Composition
3.3kΩ +5% 1/4W Carbon Composition
16kΩ +5% 1/4W Carbon Composition
*NOTE: This value can be reduced when a battery is the power source.
Figure 2. SA608 45MHz Test Circuit (Relays as shown)
7
November 3, 1992
Philips Semiconductors RF Communications Products
Product specification
Low voltage high performance mixer FM IF system
SA608
RF GENERATOR
SA608 DEMO-BOARD
45MHz
RSSI AUDIO
V
CC
(+3)
DE-EMPHASIS
FILTER
DC VOLTMETER
C–MESSAGE
HP339A DISTORTION
ANALYZER
SCOPE
Figure 3. SA608 Application Circuit Test Set Up
NOTES:
1. C-message: The C-message and de-emphasis filter combination has a peak gain of 10 for accurate measurements. Without the gain, the
measurements may be affected by the noise of the scope and HP339 analyzer. The de-emphasis filter has a fixed -6dB/Octave slope be-
tween 300Hz and 3kHz.
2. Ceramic filters: The ceramic filters can be 30kHz SFG455A3s made by Murata which have 30kHz IF bandwidth (they come in blue), or
16kHz CFU455Ds, also made by Murata (they come in black). All of our specifications and testing are done with the more wideband filter.
3. RF generator: Set your RF generator at 45.000MHz, use a 1kHz modulation frequency and a 6kHz deviation if you use 16kHz filters, or
8kHz if you use 30kHz filters.
4. Sensitivity: The measured typical sensitivity for 12dB SINAD should be 0.35µV or –116dBm at the RF input.
5. Layout: The layout is very critical in the performance of the receiver. We highly recommend our demo board layout.
6. RSSI: The smallest RSSI voltage (i.e., when no RF input is present and the input is terminated) is a measure of the quality of the layout and
design. If the lowest RSSI voltage is 500mV or higher, it means the receiver is in regenerative mode. In that case, the receiver sensitivity
will be worse than expected.
7. Supply bypass and shielding: All of the inductors, the quad tank, and their shield must be grounded. A 10-15µF or higher value tantalum
capacitor on the supply line is essential. A low frequency ESR screening test on this capacitor will ensure consistent good sensitivity in pro-
duction. A 0.1µF bypass capacitor on the supply pin, and grounded near the 44.545MHz oscillator improves sensitivity by 2-3dB.
8. R5 can be used to bias the oscillator transistor at a higher current for operation above 45MHz. Recommended value is 22kΩ, but should not
be below 10kΩ.
8
November 3, 1992
Philips Semiconductors RF Communications Products
Product specification
Low voltage high performance mixer FM IF system
SA608
mA
6
V
= 7V
CC
5
4
3
2
V
= 5V
CC
V
= 3V
CC
V
= 2.7V
CC
°C
–55
–35
–15
5
25
45
65
85
105
125
Figure 4. I vs Temperature
CC
–8.0
–8.5
–9.0
2.7V
3V
–9.5
–10.0
–10.5
–11.0
–11.5
–12.0
–12.5
–13.0
–13.5
–14.0
7V
–40
–30
–20
–10
0
10
20
30
40
50
60
70
80
Temperature (°C)
Figure 5. Third Order Intercept Point vs Supply Voltage
9
November 3, 1992
Philips Semiconductors RF Communications Products
Product specification
Low voltage high performance mixer FM IF system
SA608
8.00
7.75
7.50
7.25
7.00
6.75
7.0V
6.50
3V
6.25
6.00
5.75
5.50
5.25
5.00
2.7V
–40
–30
–20
–10
0
10
20
30
40
50
60
70
80
TEMPERATURE (°C)
Figure 6. Mixer Noise Figure vs Supply Voltage
18.00
17.75
17.50
17.25
17.00
16.75
16.50
16.25
16.00
2.7V
3V
7.0V
–40
–30
–20
–10
0
10
20
30
40
50
60
70
80
TEMPERATURE (°C)
Figure 7. Conversion Gain vs Supply Voltage
10
November 3, 1992
Philips Semiconductors RF Communications Products
Product specification
Low voltage high performance mixer FM IF system
SA608
20
10
0
RF = 45MHz
IF = 455kHz
–10
–20
–30
3rd ORDER PRODUCT
FUND PRODUCT
–40
–50
–60
–70
–80
*50Ω INPUT
–66
–56
–46
–36
–26
–16
–6
4
14
24
34
RF* INPUT LEVEL (dBm)
Figure 8. Mixer Third Order Intercept and Compression
11
November 3, 1992
Philips Semiconductors RF Communications Products
Product specification
Low voltage high performance mixer FM IF system
SA608
5
AUDIO
0
–5
–10
V
= 3V
CC
–15
–20
–25
–30
–35
–40
–45
–50
–55
–60
–65
RF = 45MHz
DEVIATION = ±8kHz
AUDIO LEVEL = 52.5mV
RMS
AM REJECTION
THD + NOISE
NOISE
–125
–115
–105
–95
–85
–75
–65
–55
–45
–35
–25
RF LEVEL (dBm)
Figure 9. Sensitivity vs RF Level (–40°C)
5
0
AUDIO
–5
–10
V
= 3V
CC
RF = 45MHz
–20
–25
–30
–35
–40
–45
–50
–55
–60
–65
DEVIATION = ±8kHz
AUDIO LEVEL = 58.5mV
RMS
AM REJECTION
THD + NOISE
NOISE
–125
–115
–105
–95
–85
–75
RF LEVEL (dBm)
–65
–55
–45
–35
–25
Figure 10. Sensitivity vs RF Level (+25°C)
12
November 3, 1992
Philips Semiconductors RF Communications Products
Product specification
Low voltage high performance mixer FM IF system
SA608
5
AUDIO
0
–5
–10
V
= 3V
–15
–20
–25
–30
–35
–40
–45
–50
–55
–60
–65
CC
RF = 45MHz
DEVIATION = ±8kHz
AUDIO LEVEL = 63.5mV
RMS
AM REJECTION
THD + NOISE
NOISE
–125
–115
–105
–95
–85
–75
RF LEVEL (dBm)
–65
–55
–45
–35
–25
Figure 11. Sensitivity vs RF Level (Temperature 85°C)
5
AUDIO
0
–5
–10
–15
–20
–25
–30
–35
–40
–45
–50
–55
–60
–65
V
= 3V
CC
RF = 45MHz
RF LEVEL = –45dBm
DEVIATION = ±8kHz
AUDIO LEVEL = +58.6mV
RMS
DISTORTION
AM REJECTION
NOISE
65
–55
–35
–15
5
25
45
85
105
125
TEMPERATURE (°C)
Figure 12. Relative Audio Level, Distortion, AM Rejection and Noise vs Temperature
13
November 3, 1992
Philips Semiconductors RF Communications Products
Product specification
Low voltage high performance mixer FM IF system
SA608
2.400
2.000
1.600
1.200
0.800
0.400
0.000
+85°C
ROOM
–40°C
–95
–85
–75
–65
–55
–45
–35
–25
–15
–5
5
IF LEVEL (dBm)
Figure 13. RSSI (455kHz IF @ 3V)
2.1
2.0
1.9
1.8
1.7
1.6
1.5
1.4
1.3
1.2
1.1
1.0
0.9
0.8
0.7
0.6
0.5
0.4
0.3
+85°C
+27°C
–40°C
–125
–115
–105
–95
–85
–75
–65
–55
–45
–35
–25
RF LEVEL (dBm)
Figure 14. RSSI vs RF Level and Temperature - V = 3V
CC
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November 3, 1992
Philips Semiconductors RF Communications Products
Product specification
Low voltage high performance mixer FM IF system
SA608
V
300
V
= 7V
CC
250
200
150
100
50
V
V
= 5V
= 3V
CC
CC
V
= 2.7V
CC
°C
0
–55
–35
–15
5
25
45
65
85
105
125
Figure 15. Audio Output vs Temperature
15
November 3, 1992
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