INTEGRATED CIRCUITS
SA58641
High performance mixer FM IF system
with high-speed RSSI
Objective data
2004 Dec 16
Philips
Semiconductors
Philips Semiconductors
Objective data
High performance mixer FM IF system
with high-speed RSSI
SA58641
DESCRIPTION
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).
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.
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.
PIN CONFIGURATION
DK Package
RF
IN
RF BYPASS
XTAL OSC
(EMITTER)
(BASE)
V
CC
RSSI FEEDBACK
RSSI
OUT
POWER DOWN CONTROL
DATA OUT
QUADRATURE IN
1
2
3
4
5
6
7
8
9
10
20
19
18
17
16
15
14
13
12
11
MIXER OUT
IF AMP DECOUPLING
IF AMP IN
IF AMP DECOUPLING
IF AMP OUT
GND
LIMITER IN
LIMITER DECOUPLING
LIMITER DECOUPLING
LIMITER OUT
XTAL OSC
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
oscillator can be injected)
SR00491
Figure 1. Pin configuration
APPLICATIONS
•
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
•
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
•
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 (I
CC
= 200
µA)
ORDERING INFORMATION
DESCRIPTION
20-Pin Plastic Shrink Small Outline Package (Surface-mount)
TEMPERATURE RANGE
–40
°C
to +85
°C
ORDER CODE
SA58641DK
DWG #
SOT266–1
2004 Dec 16
2
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
IF
AMP
MIXER
GND
LIMITER
OSCILLATOR
FAST
RSSI
QUAD
V
CC
E
B
RSSI
– +
PWR
DWN
– +
AUDIO
1
2
3
4
5
6
7
8
9
10
SR00492
Figure 2. Block diagram
ABSOLUTE MAXIMUM RATINGS
SYMBOL
V
CC
V
IN
T
stg
T
amb
θ
JA
Single supply voltage
Voltage applied to any other pin
Storage temperature range
Operating ambient temperature range SA58641
Thermal impedance (DC package)
PARAMETER
RATING
0.3 to 7
–0.3 to (V
CC
+0.3)
–65 to +150
–40 to +85
117
UNITS
V
V
°C
°C
°C/W
DC ELECTRICAL CHARACTERISTICS
V
CC
= +5 V, T
amb
= 25
°C;
unless otherwise stated.
LIMITS
SYMBOL
V
CC
I
CC
PARAMETER
Power supply voltage range
DC current drain
Input current
Pin 8 = HIGH
Pin 8 LOW
Pin 8 HIGH
Pin 8 LOW
Input level
I
CC
t
ON
t
OFF
Standby
Power-up time
Power-down time
Pin 8 HIGH
Pin 8 = LOW
RSSI valid (10% to 90%)
RSSI invalid (90% to 10%)
TEST CONDITIONS
MIN
4.5
5.5
–10
–10
0
0.7V
CC
0.2
10
5
TYP
5.0
7.5
MAX
5.5
8.5
10
10
0.3V
CC
V
CC
0.5
UNITS
V
mA
µA
µA
V
V
mA
µs
µs
2004 Dec 16
3
Philips Semiconductors
Objective data
High performance mixer FM IF system
with high-speed RSSI
SA58641
AC ELECTRICAL CHARACTERISTICS
T
amb
= 25
°C;
V
CC
= +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 = 160mV
RMS
)
f
IN
f
OSC
Input signal frequency
External oscillator (buffer)
Noise figure at 240 MHz
Third-order input intercept point
Conversion power gain
RF input resistance
RF input capacitance
Mixer output resistance
IF section
IF amp gain
Limiter gain
Input limiting –3dB
AM rejection
Data level
3 dB data bandwidth
SINAD sensitivity
THD
S/N
Total harmonic distortion
Signal-to-noise ratio
No modulation for noise
IF level = –90 dBm
IF RSSI output with buffer
IF level = –45 dBm
IF level = –10 dBm
IF RSSI output rise time
(10kHz pulse, no 10.7MHz filter)
(no RSSI bypass capacitor)
IF RSSI output fall time
(10 kHz pulse, no 10.7 MHz filter)
(no RSSI bypass capacitor)
RSSI range
RSSI accuracy
IF input impedance
IF output impedance
Limiter input impedance
Limiter output impedance
Limiter output level with no load
RF/IF section (int LO)
System RSSI output
System SINAD
RF level = –10 dBm
RF level = –95 dBm
1.4
12
V
dB
IF frequency = 10.7 MHz
RF level = –56 dBm
RF level = –28 dBm
IF frequency = 10.7 MHz
RF level = –56 dBm
RF level = –28 dBm
2.0
7.3
70
±2.0
330
330
330
300
130
µs
µs
dB
dB
Ω
Ω
Ω
Ω
mV
RMS
1.2
1.1
µs
µs
0.2
0.8
RF level = –111 dBm
330
Ω
load
330
Ω
load
Test at Pin 18
80% AM 1 kHz
R
LOAD
= 100 kΩ
120
600
38
54
–105
50
130
700
16
–43
60
0.6
1.2
1.6
1.0
1.8
2.3
–38
dB
dB
dBm
dB
mV
RMS
kHz
dB
dB
dB
V
V
V
(Pin 20)
Matched f1=240.05 MHz; f2=240.35 MHz
Matched 14.5 dBV step-up
Single-ended input
8
500
500
12
–16
11
700
3.5
330
MHz
MHz
dB
dBm
dB
Ω
pF
Ω
2004 Dec 16
4
Philips Semiconductors
Objective data
High performance mixer FM IF system
with high-speed RSSI
SA58641
PERFORMANCE CHARACTERISTICS
9.0
8.5
8.0
7.5
7.0
6.5
6.0
5.5
5.0
–50 –40 –30 –20 –10 0 10 20 30 40
TEMPERATURE (°C)
V
CC
= 5V
0.50
0.45
POWER DOWN SUPPLY CURRENT (mA)
0.40
0.35
0.30
0.25
0.20
0.15
0.10
0.05
0.00
–50 –40 –30 –20 –10 0 10 20 30 40 50 60 70 80 90 100
TEMPERATURE (°C)
SUPPLY CURRENT (mA)
V
CC
= 5V
50
60
70 80 90
Supply Current vs Temperature and Supply Voltage
20
19
18
17
16
MIXER GAIN
(dB)
15
14
13
12
11
10
9
8
7
6
5
–40
0
25
Temperature (°C)
70
85
5.5V
RF level = -45 dBm
Power Down Supply Current vs Temperature and Supply Voltage
–5
–7
RF level = -45 dBm
–9
MIXER IIP3 (deB)
–11
–13
–15
–17
–19
–21
–23
–25
–40
0
5.5V
25
Temperature (°C)
70
85
Mixer Power Gain vs Temperature and Supply Voltage
300
Mixer IIP3 at 240MHz vs Temperature and Supply Voltage
20
AUDIO
0
250
AUDIO REFERENCE (mVrms)
5.5V
200
AUDIO (dB)
–40
DISTORTION
–60
NOISE
–20
AM REJECTION
150
100
–80
50
–100
12dB SINAD
0
–40
0
25
Temperature (°C)
70
85
–120
–50 –40 –30 –20 –10 0 10 20 30 40 50
TEMPERATURE (°C)
60
70 80 90
Audio Reference Level vs Temperature and Supply Voltage
12dB SINAD and Relative Audio, THD, Noise
and AM Rejection for VCC = 5 V vs Temperature
RF = 240MHz, Level = –68dBm, Deviation = 125kHz
SR02522
Figure 3. Performance Characteristics
2004 Dec 16
5
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