SA608 Datasheet, PDF (3/14 Pages) NXP Semiconductors – Low voltage high performance mixer FM IF system

Philips Semiconductors RF Communications Products
Low voltage high performance mixer FM IF system
Product specification
SA608
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 = 2.4k; R18
= 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
UNITS
MIN
TYP MAX
Mixer/Osc section (ext LO = 220mV_RMS)
f_IN
Input signal frequency
f_OSC
Crystal oscillator frequency
Noise figure at 45MHz
150
MHz
150
MHz
6.2
dB
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
13.5
17
19.5
dB
50Ω source
+2.5
dB
RF input resistance
Single–ended input
8
kΩ
RF input capacitance
3.0
4.0
pF
Mixer output resistance
(Pin 20)
1.25
1.5
kΩ
IF section
IF amp gain
50Ω source
44
dB
Limiter gain
50Ω source
58
dB
Input limiting –3dB, R₁₇ = 2.4k
AM rejection
Audio level²
Test at Pin 18
80% AM 1kHz
–109
45
35
60
80
dBm
dB
mV
SINAD sensitivity
RF level –110dB
17
dB
THD Total harmonic distortion
–35
–50
dB
S/N
Signal–to–noise ratio
IF RSSI output, R₉ = 2kΩ¹
No modulation for noise
IF level = –118dBm
IF level = –68dBm
62
dB
0.3
0.8
V
.70
1.1
1.80
V
IF level = –23dBm
1.2
1.8
2.5
V
RSSI range
90
dB
RSSI accuracy
+1.5
dB
IF input impedance
1.3
1.5
kΩ
IF output impedance
0.3
kΩ
Limiter input impedance
1.30
1.5
kΩ
Limiter output impedance
(Pin 11)
200
Ω
Limiter output level
(Pin 11) no load
5kΩ load
130
115
mV_RMS
Frequency check/lim (–) output impedance (Pin 9)
200
Ω
Frequency check/lim (–) output level
(Pin 9) no load
5kΩ load
130
115
mV_RMS
RF/IF section (int LO)
Audio level
System RSSI output
System SINAD sensitivity
3V = V_CC, RF level = –27dBm
3V = V_CC, RF level = –27dBm
RF level = –117dBm
120
mV_RMS
2.2
V
12
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.
November 3, 1992
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