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Philips Semiconductors
Product specification
SA605
High performance low power mixer FM IF system
1997 Nov 07
4
AC ELECTRICAL CHARACTERISTICS
TA = 25°C; VCC = +6V, unless otherwise stated. RF frequency = 45MHz + 14.5dBV RF input step-up; IF frequency = 455kHz; R17 = 5.1k; RF
level = -45dBm; FM modulation = 1kHz with
±8kHz peak deviation. Audio output with C-message weighted filter and de-emphasis capacitor.
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.
LIMITS
SYMBOL
PARAMETER
TEST CONDITIONS
SA605
UNITS
MIN
TYP
MAX
Mixer/Osc section (ext LO = 300mV)
fIN
Input signal frequency
500
MHz
fOSC
Crystal oscillator frequency
150
MHz
Noise figure at 45MHz
5.0
dB
Third-order input intercept point
f1 = 45.0; f2 = 45.06MHz
-10
dBm
Conversion power gain
Matched 14.5dBV step-up
10
13
15
dB
50
source
-1.7
dB
RF input resistance
Single-ended input
3.0
4.7
k
RF input capacitance
3.5
4.0
pF
Mixer output resistance
(Pin 20)
1.25
1.5
k
IF section
IF amp gain
50
source
39.7
dB
Limiter gain
50
source
62.5
dB
Input limiting -3dB, R17 = 5.1k
Test at Pin 18
-113
dBm
AM rejection
80% AM 1kHz
29
34
43
dB
Audio level, R10 = 100k
15nF de-emphasis
80
150
260
mVRMS
Unmuted audio level, R11 = 100k
150pF de-emphasis
480
mV
SINAD sensitivity
RF level -118dB
16
dB
THD
Total harmonic distortion
-34
-42
dB
S/N
Signal-to-noise ratio
No modulation for noise
73
dB
IF RSSI output, R9 = 100k1
IF level = -118dBm
0
160
650
mV
IF level = -68dBm
1.9
2.5
3.1
V
IF level = -18dBm
4.0
4.8
5.6
V
RSSI range
R9 = 100k Pin 16
90
dB
RSSI accuracy
R9 = 100k Pin 16
+1.5
dB
IF input impedance
1.40
1.6
k
IF output impedance
0.85
1.0
k
Limiter input impedance
1.40
1.6
k
Unmuted audio output resistance
58
k
Muted audio output resistance
58
k
RF/IF section (int LO)
Unmuted audio level
4.5V = VCC, RF level = -27dBm
450
mVRMS
System RSSI output
4.5V = VCC, RF level = -27dBm
4.3
V
NOTE:
1. The generator source impedance is 50
, but the SA605 input impedance at Pin 18 is 1500. As a result, IF level refers to the actual signal
that enters the SA605 input (Pin 8) which is about 21dB less than the ”available power” at the generator.