PHILIPS SA58641

INTEGRATED CIRCUITS
SA58641
High performance mixer FM IF system
with high-speed RSSI
Objective data
2004 Dec 16
Philips Semiconductors
Objective data
High performance mixer FM IF system
with high-speed RSSI
DESCRIPTION
SA58641
PIN CONFIGURATION
The SA58641 is a high performance monolithic FM IF system with
high-speed RSSI incorporating a mixer/oscillator, two limiting
intermediate frequency amplifiers, quadrature detector, logarithmic
received signal strength indicator (RSSI), voltage regulator,
wideband data output and fast RSSI op amps. The SA58641 is
available in 20-lead SSOP (shrink small outline package).
DK Package
RFIN
The SA58641 was designed for high bandwidth portable
communication applications and will function down to 2.7 V. The RF
section is similar to the famous SA605. The data output has a
minimum bandwidth of 600 kHz. This is designed to demodulate
wideband data. The RSSI output is amplified. The RSSI output has
access to the feedback pin. This enables the designer to adjust the
level of the outputs or add filtering.
1
20
MIXER OUT
RF BYPASS
2
19
IF AMP DECOUPLING
(EMITTER)
3
18
IF AMP IN
(BASE)
4
17
IF AMP DECOUPLING
VCC
5
16
IF AMP OUT
6
15
GND
RSSIOUT
7
14
LIMITER IN
POWER DOWN CONTROL
8
13
LIMITER DECOUPLING
DATA OUT
9
12
LIMITER DECOUPLING
QUADRATURE IN
10
11
LIMITER OUT
XTAL OSC
XTAL OSC
RSSI FEEDBACK
SA58641 incorporates a power-down mode which powers down the
device when Pin 8 is LOW. Power down logic levels are CMOS and
TTL compatible with high input impedance.
FEATURES
• Wideband data output (600 kHz min.)
• Fast RSSI rise and fall times
• Low power consumption: 7.5 mA typ. at 5 V
• Mixer input to >500 MHz
• Mixer noise figure of 12 dB at 240 MHz
• XTAL oscillator effective to 150 MHz (L.C. oscillator to 1 GHz local
SR00491
Figure 1. Pin configuration
APPLICATIONS
• DECT (Digital European Cordless Telephone)
• Digital cordless telephones
• Digital cellular telephones
• Portable high performance communications receivers
• Single conversion VHF/UHF receivers
• FSK and ASK data receivers
• Wireless LANs
oscillator can be injected)
• 92 dB of IF Amp/Limiter gain
• 25 MHz limiter small signal bandwidth
• Temperature compensated logarithmic Received Signal Strength
Indicator (RSSI) with a dynamic range in excess of 90 dB
• RSSI output internal op amp
• Internal op amps with rail-to-rail outputs
• Low external component count; suitable for crystal/ceramic/LC
filters
• Excellent sensitivity: 0.54 µV into 50 Ω matching network for
12 dB SINAD (Signal to Noise and Distortion ratio) for 1 kHz tone
with RF at 240 MHz and IF at 10.7 MHz
• ESD hardened
• 10.7 MHz filter matching (330 Ω)
• Power-down mode (ICC = 200 µA)
ORDERING INFORMATION
DESCRIPTION
20-Pin Plastic Shrink Small Outline Package (Surface-mount)
2004 Dec 16
2
TEMPERATURE RANGE
ORDER CODE
DWG #
–40 °C to +85 °C
SA58641DK
SOT266–1
Philips Semiconductors
Objective data
High performance mixer FM IF system
with high-speed RSSI
SA58641
BLOCK DIAGRAM
20
19
18
17
16
15
14
13
12
11
GND
IF
AMP
LIMITER
MIXER
– +
VCC
1
2
E
B
3
4
QUAD
FAST
RSSI
OSCILLATOR
PWR
DWN
– +
AUDIO
RSSI
5
6
7
8
9
10
SR00492
Figure 2. Block diagram
ABSOLUTE MAXIMUM RATINGS
SYMBOL
PARAMETER
VCC
Single supply voltage
VIN
Voltage applied to any other pin
Tstg
Tamb
θJA
RATING
UNITS
0.3 to 7
V
–0.3 to (VCC+0.3)
V
Storage temperature range
–65 to +150
°C
Operating ambient temperature range SA58641
–40 to +85
°C
117
°C/W
Thermal impedance (DC package)
DC ELECTRICAL CHARACTERISTICS
VCC = +5 V, Tamb = 25 °C; unless otherwise stated.
LIMITS
SYMBOL
PARAMETER
VCC
Power supply voltage range
ICC
DC current drain
Input current
Input level
ICC
Standby
tON
Power-up time
tOFF
Power-down time
2004 Dec 16
TEST CONDITIONS
MIN
TYP
MAX
UNITS
4.5
5.0
5.5
V
Pin 8 = HIGH
5.5
7.5
8.5
mA
Pin 8 LOW
–10
10
µA
Pin 8 HIGH
–10
10
µA
Pin 8 LOW
0
0.3VCC
V
Pin 8 HIGH
0.7VCC
VCC
V
0.5
mA
Pin 8 = LOW
0.2
RSSI valid (10% to 90%)
10
µs
RSSI invalid (90% to 10%)
5
µs
3
Philips Semiconductors
Objective data
High performance mixer FM IF system
with high-speed RSSI
SA58641
AC ELECTRICAL CHARACTERISTICS
Tamb = 25 °C; VCC = +5 V, unless otherwise stated. RF frequency = 240.05 MHz + 14.5 dBV RF input step-up; IF frequency = 10.7 MHz;
RF level = –45 dBm; FM modulation = 1 kHz with ±125 kHz peak deviation. Audio output with C-message weighted filter and de-emphasis
capacitor. Test circuit Figure 1. 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.
LIMITS
SYMBOL
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNITS
Mixer/Osc section (ext LO = 160mVRMS)
fIN
fOSC
Input signal frequency
500
MHz
External oscillator (buffer)
500
MHz
Noise figure at 240 MHz
12
dB
–16
dBm
11
dB
Third-order input intercept point
Conversion power gain
RF input resistance
Matched f1=240.05 MHz; f2=240.35 MHz
Matched 14.5 dBV step-up
8
700
Ω
3.5
pF
(Pin 20)
330
Ω
330 Ω load
38
dB
Single-ended input
RF input capacitance
Mixer output resistance
IF section
IF amp gain
Limiter gain
Input limiting –3dB
AM rejection
Data level
330 Ω load
54
dB
Test at Pin 18
–105
dBm
80% AM 1 kHz
RLOAD = 100 kΩ
3 dB data bandwidth
SINAD sensitivity
THD
Total harmonic distortion
S/N
Signal-to-noise ratio
50
dB
120
130
mVRMS
600
700
kHz
16
dB
RF level = –111 dBm
–43
No modulation for noise
IF level = –90 dBm
IF RSSI output with buffer
IF RSSI output rise time
(10kHz pulse, no 10.7MHz filter)
(no RSSI bypass capacitor)
IF RSSI output fall time
–38
60
dB
dB
0.6
1.0
V
IF level = –45 dBm
0.2
1.2
1.8
V
IF level = –10 dBm
0.8
1.6
2.3
V
IF frequency = 10.7 MHz
RF level = –56 dBm
1.2
µs
RF level = –28 dBm
1.1
µs
IF frequency = 10.7 MHz
(10 kHz pulse, no 10.7 MHz filter)
RF level = –56 dBm
2.0
µs
(no RSSI bypass capacitor)
RF level = –28 dBm
7.3
µs
RSSI range
70
dB
RSSI accuracy
±2.0
dB
IF input impedance
330
Ω
IF output impedance
330
Ω
Limiter input impedance
330
Ω
Limiter output impedance
300
Ω
Limiter output level with no load
130
mVRMS
RF/IF section (int LO)
2004 Dec 16
System RSSI output
RF level = –10 dBm
1.4
V
System SINAD
RF level = –95 dBm
12
dB
4
Philips Semiconductors
Objective data
High performance mixer FM IF system
with high-speed RSSI
SA58641
PERFORMANCE CHARACTERISTICS
9.0
0.50
0.45
POWER DOWN SUPPLY CURRENT (mA)
SUPPLY CURRENT (mA)
8.5
VCC = 5V
8.0
7.5
7.0
6.5
6.0
5.5
0.40
0.35
VCC = 5V
0.30
0.25
0.20
0.15
0.10
0.05
5.0
–50 –40 –30 –20 –10 0 10 20 30 40
TEMPERATURE (°C)
50
60
0.00
–50 –40 –30 –20 –10 0 10 20 30 40 50 60 70 80 90 100
TEMPERATURE (°C)
70 80 90
Supply Current vs Temperature and Supply Voltage
Power Down Supply Current vs Temperature and Supply Voltage
–5
20
RF level = -45 dBm
19
–7
18
RF level = -45 dBm
–9
17
MIXER IIP3 (deB)
MIXER GAIN
(dB)
16
15
5.5V
14
–11
–13
13
5.5V
–15
12
–17
11
10
–19
9
–21
8
7
–23
6
–25
5
–40
0
25
Temperature (°C)
70
85
–40
Mixer Power Gain vs Temperature and Supply Voltage
0
25
Temperature (°C)
70
85
Mixer IIP3 at 240MHz vs Temperature and Supply Voltage
20
300
AUDIO
0
–20
5.5V
AM REJECTION
200
AUDIO (dB)
AUDIO REFERENCE (mVrms)
250
150
100
–40
DISTORTION
–60
–80
50
–100
NOISE
12dB SINAD
–120
0
–40
0
25
70
–50 –40 –30 –20 –10 0 10 20 30 40 50
TEMPERATURE (°C)
85
Temperature (°C)
70 80 90
12dB SINAD and Relative Audio, THD, Noise
and AM Rejection for VCC = 5 V vs Temperature
RF = 240MHz, Level = –68dBm, Deviation = 125kHz
Audio Reference Level vs Temperature and Supply Voltage
Figure 3. Performance Characteristics
2004 Dec 16
60
5
SR02522
Philips Semiconductors
Objective data
High performance mixer FM IF system
with high-speed RSSI
SA58641
PERFORMANCE CHARACTERISTICS (continued)
–10
–20
1.8
0
1.6
–10
1.4
AM REJECTION
1.3
RSSI
–40
RSSI (V)
–30
1.0
THD+N
–50
0.8
–60
0.6
NOISE
2.0
AUDIO
1.8
1.6
–20
1.4
AM REJECTION
–30
1.2
–40
1.0
–50
0.8
THD+N
NOISE
–60
0.6
–70
0.4
0.0
RF INPUT LEVEL (dBm)
0
–10
–20
–30
–40
–50
–60
–70
–80
–90
–100
–110
RSSI
0
–100
–10
–90
–20
0
–30
–90
–40
0.2
–50
–80
–60
0.2
–70
–80
–80
0.4
–90
–70
–110
RSSI (V)
AUDIO
RELATIVE TO AUDIO OUTPUT (dB)
0
RELATIVE TO AUDIO OUTPUT (dB)
10
2
10
RF INPUT LEVEL (dBm)
Receiver RF Performance — T = 25°C,
Audio Level = 129mVRMS
Receiver RF Performance — T = –40°C,
Audio Level = 118mVRMS
10
2
0
1.8
–10
1.6
–20
–20
IF OUTPUT POWER (dBm)
0
–10
1.4
AM REJECTION
RSSI
–30
1.2
–40
1
–50
THD+N
0.8
–60
NOISE
0.6
RSSI (V)
RELATIVE TO AUDIO OUTPUT (dB)
AUDIO
–30
–40
–50
–60
–70
–80
–90
–70
0.4
–80
0.2
–90
0
–10
–15
–20
–25
–30
–35
–40
–45
–50
–55
–60
–65
–110
0
–10
–20
–30
–40
–50
–60
–70
–80
–90
–100
–110
–100
RF INPUT POWER (dBm)
Mixer Third Order Intercept and Compression
Receiver RF Performance – T = 85°C, Audio Level = 131mVRMS
85
2
–40°C
RF level = -45 dBm
–5
1.8
–7
25°C
1.6
85°C
–9
MIXER IIP3 (dB)
1.4
–11
1.2
5.5V
RSSI (V)
–13
–15
–17
1
0.8
0.6
–19
0.4
–21
0.2
–23
0
–10
–20
–30
–40
–50
–60
–70
RF INPUT LEVEL (dBm)
RSSI vs RF Input Level and Temperature
Mixer IIP3 at 240MHz vs Temperature and Supply Voltage
SR02523
Figure 4. Performance Characteristics
2004 Dec 16
–80
25
70
Temperature (°C)
–90
0
–110
–40
–100
0
–25
6
Philips Semiconductors
Objective data
High performance mixer FM IF system
with high-speed RSSI
SA58641
50.00
65.00
48.00
63.00
46.00
61.00
44.00
59.00
POWER GAIN (dB)
VCC = 5V
42.00
40.00
38.00
36.00
34.00
VCC = 5V
57.00
55.00
53.00
51.00
49.00
32.00
47.00
30.00
TEMPERATURE (°C)
90.00
70.00
50.00
30.00
TEMPERATURE (°C)
Limiting Amplifier Gain vs Temperature vs Supply Voltage
IF Amplifier Gain vs Temperature vs Supply Voltage
0.8
0.8
600kHz Data Rate,
IF = 9.85MHz,
Dev = 288kHz,
RF = -40dBm
0.6
0.7
0.5
5.5V
0.4
5.5V
0.6
DATA LEVEL (Vp-p)
0.7
DATA LEVEL (Vp-p)
10.00
–10.00
–50.00
90.00
70.00
50.00
30.00
10.00
–10.00
–30.00
–50.00
45.00
–30.00
POWER GAIN (dB)
PERFORMANCE CHARACTERISTICS (continued)
0.3
0.5
0.4
0.3
0.2
0.2
0.1
0.1
1kHz Data Rate,
IF = 9.85MHz,
Dev = 288kHz,
RF = -40dBm
0
0
–40
0
25
70
Temperature (°C)
–40
85
Data Level vs Temperature and Supply Voltage
0
25
70
Temperature (°C)
85
Data Level vs Temperature and Supply Voltage
SR02524
Figure 5. Performance Characteristics
2004 Dec 16
7
Philips Semiconductors
Objective data
High performance mixer FM IF system
with high-speed RSSI
SA58641
PERFORMANCE CHARACTERISTICS (continued)
300
0.8
0.7
AUDIO REFERENCE (mVrms)
250
5.5V
600kHz Data Rate,
IF = 9.85MHz,
Dev = 288kHz,
RF = -40dBm
0.6
DATA LEVEL (Vp-p)
200
150
100
0.5
5.5V
0.4
0.3
0.2
50
0.1
0
–40
0
25
70
Temperature (°C)
85
0
–40
0
Audio Reference Level vs Temperature and Supply Voltage
25
70
Temperature (°C)
85
Data Level vs Temperature and Supply Voltage
0.8
1kHz Data Rate,
IF = 9.85MHz,
Dev = 288kHz,
RF = -40dBm
0.7
5.5V
DATA LEVEL (Vp-p)
0.6
0.5
0.4
0.3
0.2
0.1
0
–40
0
25
70
Temperature (°C)
85
Data Level vs Temperature and Supply Voltage
SR02525
Figure 6. Performance Characteristics
2004 Dec 16
8
Philips Semiconductors
Objective data
High performance mixer FM IF system
with high-speed RSSI
SA58641
PIN FUNCTIONS
PIN
PIN
DC V
No. MNEMONIC
PIN
PIN
DC V
No. MNEMONIC
EQUIVALENT CIRCUIT
EQUIVALENT CIRCUIT
VCC
RSSI
1
RF IN
+1.07
6
0.8k
FEEDBACK
+0.20
—
6
+
0.8k
1
2
VCC
RF
2
BYPASS
RSSI
+1.07
7
OUT
+0.20
+
7
—
R
XTAL
3
OSC
POWER
18k
+1.57
8
DOWN
+2.75
8
4
R
MIX
VCC
3
XTAL
4
OSC
DATA
150µA
+2.32
9
OUT
+1.09
+
9
—
80k
5
5
VCC
VREF
10
QUAD.
+3.00
10
IN
+3.00
BANDGAP
20µA
SR00497
Figure 7. Pin Functions
2004 Dec 16
9
Philips Semiconductors
Objective data
High performance mixer FM IF system
with high-speed RSSI
SA58641
PIN FUNCTIONS (continued)
PIN
PIN
DC V
No. MNEMONIC
EQUIVALENT CIRCUIT
PIN
PIN
DC V
No. MNEMONIC
LIMITER
11
OUT
EQUIVALENT CIRCUIT
IF
+1.35
16
11
AMP OUT
+1.22
140Ω
16
8.8k
8.8k
LIMITER
12
DECOUP
IF AMP
+1.23
17
DECOUP
+1.22
14
18
LIMITER
13
COUPLING
IF
330Ω
+1.23
18
AMP IN
330Ω
+1.22
50µA
50µA
12
17
13
19
LIMITER
14
IN
IF AMP
+1.23
19
0
20
DECOUP
+1.22
110Ω
MIXER
15
GND
OUT
20
+1.03
400µA
SR00498
Figure 8. Pin Functions (cont.)
2004 Dec 16
10
Philips Semiconductors
Objective data
High performance mixer FM IF system
with high-speed RSSI
MIXER
IF/LIM OUT
SA58641
IF/LIM IN
R9
R4
R2
C12
R3
1
1
2
19
1
C20
C17
FLT2
2
1
R10
2
C15
C13
20
R8
C14
FLT1
2
R7
R5
C11
L5
R11
R6
C16
18
17
SW5
C19
C18
16
15
14
IF
AMP
13
12
11
LIMITER
MIXER
C21
QUAD
RSSI
OSCILLATOR
– +
VCC
PWR
DWN
– +
DATA
1
2
C1
3
4
5
6
7
8
9
10
C4
C3
C6
C8
R1
*L1
C2
L3
C5
FLT
3
C7
*L2
VCC
RF IN
L4
C9
FLT
4
RSSI
OUT
PWR
DWN
CTRL
DATA
OUT
C10
LO IN
Automatic Test Circuit Component List
R1
R2
R3
R4
R5
R6
R7
R8
R9
R10
R11
8.2kΩ select
6.42kΩ
347.8Ω
49.9Ω
1kΩ
49.9Ω
6.42kΩ
347.8Ω
49.9Ω
1kΩ
49.9Ω
C1
C2
C3
C4
C5
C6
*C7
C8
C9
C10
C11
0.1µF
1–5pF select for input match
0.1µF
0.1µF
1–5pF select for input match
100pF
6.8µF 10V
1µF
39pF select
0.1µF
0.1µF
C12 160pF select
C13 1000pF
C14 0.1µF
C15 1000pF
C16 0.1µF
C17 0.1µF
C18 1000pF
C19 1000pF
C20 0.1µF
C21 1pF
L1
L2
L3
L4
L5
FLT1
FLT2
FLT3
FLT4
*NOTE: This value can be reduced when a battery is the power source.
10.7MHz (Murata SFE10.7MA5-A)
10.7MHz (Murata SFE10.7MA5-A)
“C” message weighted
Active de-emphasis
SR00501
Figure 9. SA58641 240.05MHz (RF) / 10.7MHz (IF) Test Circuit
2004 Dec 16
150nH select for input match
22nH select for input match
47nH select for input match
5.6µH select for input match
1.27–2.25µH select for mixer
output match
11
Philips Semiconductors
Objective data
High performance mixer FM IF system
with high-speed RSSI
SA58641
C1
5–30pF
SMA
RF IN
L4
680nH
J1
110.592MHz
+/–288kHz
L1
180nH
C20
68pF
C21
330pF
U1
1
RF IN
2
RF BYPASS
3
XTAL
OSC (EMITTER)
4
XTAL
OSC (BASE)
5
VCC
MIXER OUT
20
IF AMP
DECOUPLING 1
19
IF IN
18
C19
1nF
C18
68pF
C2
10nF
SMA
LO IN 120.392MHz
@–10dBm
C3
1nF
C4
1nF
J2
R1
51
IF AMP
DECOUPLING 2
17
IF OUT
16
C17
1nF
C16
100pF
R3
22k
6
RSSI FEEDBACK
7
RSSI OUT
GROUND
15
LIMITER IN
14
C13
100pF
R4
33k
+3V
R2
10
8
PD CTRL
LIMITER DEC1
13
9
DATA OUT
LIMITER DEC2
12
LIMITER OUT
11
VCC
GND
C5
15µF
+
C6
100nF
10
QUAD IN
C11
1nF
C12
1nF
SA58641
C14
47pF
J3
RSSI
C7
470pF
C10
15pF
PWR DWN
+
R5
1.2k
C8
5-30pF
C9
82pF
L2
2.2µH
C15
330pF
L3
680nH
DATA OUT
R6
560
SR02526
Figure 10. SA58641 110.592 MHz (RF) / 9.8 MHz (IF) DECT Application Circuit
2004 Dec 16
12
Philips Semiconductors
Objective data
High performance mixer FM IF system
with high-speed RSSI
Table 1.
SA58641
DECT Application Circuit Electrical Characteristics
RF frequency = 110.592 MHz; IF frequency = 9.8 MHz; RF level = –45 dBm; FM modulation = 100 kHz with ±288 kHz peak deviation.
PARAMETER
SYMBOL
TEST CONDITIONS
TYPICAL
UNITS
Mixer/Osc section (ext LO = 160 mVRMS)
PG
Conversion power gain
13
dB
NF
Noise Figure at 110 MHz
12
dB
IIP3
Third order input intercept
–15
dBm
RIN
RF input resistance
690
Ω
CIN
RF input capacitance
3.6
pF
38
dB
Matched f1 = 110.592 MHz; f2 = 110.892 MHz
IF section
330 Ω load
IF amp gain
330 Ω load
54
dB
RLOAD = 3 kΩ
130
mVRMS
700
kHz
Limiter amp gain
Data level
3 dB data bandwidth
RF/IF section (internal LO)
System RSSI output
RF level = –10 dBm
1.4
V
System S/N1
RF level = –83 dBm
10
dB
NOTE:
1. 10 dB S/N corresponds to BER = 10–3.
RF GENERATOR
110.592 MHz
SA58641 DEMO BOARD
RSSI
DATA
VCC = 5 V
LO / GENERATOR
120.392 MHz
DC VOLTMETER
SCOPE
SPECTRUM
ANALYZER
SR02527
Figure 11. SA58641 Application Circuit Test Set Up
NOTES:
1. RF generator: Set your RF generator at 110.592 MHz, use a 100 kHz modulation frequency and a ±288 kHz deviation.
2. Layout: The layout is very critical in the performance of the receiver. We highly recommend our demo board layout.
3. 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 500 mV or higher, it means the receiver is in regenerative mode. In that case, the receiver sensitivity
will be worse than expected.
4. Supply bypass and shielding: All of the inductors, the quad tank, and their shield must be grounded. A 0.1 µF bypass capacitor on the supply
pin improves sensitivity.
2004 Dec 16
13
Philips Semiconductors
Objective data
High performance mixer FM IF system
with high-speed RSSI
SA58641
TOP SILK SCREEN (SSOP)
SR02528
Figure 12. SA58641 Demoboard Layout (Not Actual Size)
2004 Dec 16
14
Philips Semiconductors
Objective data
High performance mixer FM IF system
with high-speed RSSI
SA58641
insertion loss between the first and second IF stages. If the IF filter
or interstage network does not cause 6 dB(v) insertion loss, a fixed
or variable resistor can be added between the first IF output (Pin 16)
and the interstage network.
CIRCUIT DESCRIPTION
The SA58641 is an IF signal processing system suitable for second
IF or single conversion systems with input frequency as high as
1 GHz. The bandwidth of the IF amplifier is about 40 MHz, with
38 dB of gain from a 50 Ω source. The bandwidth of the limiter is
about 28 MHz with about 54 dB of gain from a 50 Ω source.
However, the gain/bandwidth distribution is optimized for 10.7 MHz,
330 Ω source applications. The overall system is well-suited to
battery operation as well as high performance and high quality
products of all types, such as cordless and cellular hand-held
phones.
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.
Overall, the IF section has a gain of 90 dB. For operation at
intermediate frequency at 10.7 MHz. Special care must be given to
layout, termination, and interstage loss to avoid instability.
The input stage is a Gilbert cell mixer with oscillator. Typical mixer
characteristics include a noise figure of 14 dB, conversion gain of
11 dB, and input third-order intercept of –16 dBm. The oscillator will
operate in excess of 1 GHz in L/C tank configurations. Hartley or
Colpitts circuits can be used up to 100 MHz for xtal configurations.
Butler oscillators are recommended for xtal configurations up to
150 MHz.
The demodulated output (DATA) of the quadrature is a voltage
output. This output is designed to handle a minimum bandwidth of
600 kHz. This is designed to demodulate wideband data, such as in
DECT applications.
The output of the mixer is internally loaded with a 330 Ω resistor
permitting direct connection to a 10.7 MHz ceramic filter for
narrowband applications. The input resistance of the limiting IF
amplifiers is also 330 Ω. With most 10.7 MHz ceramic filters and
many crystal filters, no impedance matching network is necessary.
For applications requiring wideband IF filtering, such as DECT,
external LC filters are used (see Figure 10). To achieve optimum
linearity of the log signal strength indicator, there must be a 6 dB(v)
2004 Dec 16
A Receive Signal Strength Indicator (RSSI) completes the circuitry.
The output range is greater than 90 dB and is temperature
compensated. This log signal strength indicator exceeds the criteria
for AMPS or TACS cellular telephone, DECT and RCR-28 cordless
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
15
Philips Semiconductors
Objective data
High performance mixer FM IF system
with high-speed RSSI
SA58641
SSOP20: plastic shrink small outline package; 20 leads; body width 4.4 mm
2004 Dec 16
16
SOT266-1
Philips Semiconductors
Objective data
High performance mixer FM IF system
with high-speed RSSI
SA58641
REVISION HISTORY
Rev
Date
Description
_1
20041216
Product data (9397 750 14339).
Data sheet status
Level
Data sheet status [1]
Product
status [2] [3]
Definitions
I
Objective data
Development
This data sheet contains data from the objective specification for product development.
Philips Semiconductors reserves the right to change the specification in any manner without notice.
II
Preliminary data
Qualification
This data sheet contains data from the preliminary specification. Supplementary data will be published
at a later date. Philips Semiconductors reserves the right to change the specification without notice, in
order to improve the design and supply the best possible product.
III
Product data
Production
This data sheet contains data from the product specification. Philips Semiconductors reserves the
right to make changes at any time in order to improve the design, manufacturing and supply. Relevant
changes will be communicated via a Customer Product/Process Change Notification (CPCN).
[1] Please consult the most recently issued data sheet before initiating or completing a design.
[2] The product status of the device(s) described in this data sheet may have changed since this data sheet was published. The latest information is available on the Internet at URL
http://www.semiconductors.philips.com.
[3] For data sheets describing multiple type numbers, the highest-level product status determines the data sheet status.
Definitions
Short-form specification — The data in a short-form specification is extracted from a full data sheet with the same type number and title. For detailed information see
the relevant data sheet or data handbook.
Limiting values definition — Limiting values given are in accordance with the Absolute Maximum Rating System (IEC 60134). Stress above one or more of the limiting
values may cause permanent damage to the device. These are stress ratings only and operation of the device at these or at any other conditions above those given
in the Characteristics sections of the specification is not implied. Exposure to limiting values for extended periods may affect device reliability.
Application information — Applications that are described herein for any of these products are for illustrative purposes only. Philips Semiconductors make no
representation or warranty that such applications will be suitable for the specified use without further testing or modification.
Disclaimers
Life support — These products are not designed for use in life support appliances, devices, or systems where malfunction of these products can reasonably be
expected to result in personal injury. Philips Semiconductors customers using or selling these products for use in such applications do so at their own risk and agree
to fully indemnify Philips Semiconductors for any damages resulting from such application.
Right to make changes — Philips Semiconductors reserves the right to make changes in the products—including circuits, standard cells, and/or software—described
or contained herein in order to improve design and/or performance. When the product is in full production (status ‘Production’), relevant changes will be communicated
via a Customer Product/Process Change Notification (CPCN). Philips Semiconductors assumes no responsibility or liability for the use of any of these products, conveys
no license or title under any patent, copyright, or mask work right to these products, and makes no representations or warranties that these products are free from patent,
copyright, or mask work right infringement, unless otherwise specified.
 Koninklijke Philips Electronics N.V. 2004
All rights reserved. Printed in U.S.A.
Contact information
For additional information please visit
http://www.semiconductors.philips.com.
Fax: +31 40 27 24825
Date of release: 12-04
For sales offices addresses send e-mail to:
[email protected]
Document order number:
2004 Dec 16
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9397 750 14339