Datasheet
Philips Semiconductors Product specification
SA605High performance low power mixer FM IF system
1997 Nov 07
4
AC ELECTRICAL CHARACTERISTICS
T
A
= 25°C; V
CC
= +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)
f
IN
Input signal frequency 500 MHz
f
OSC
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
50Ω source -1.7 dB
RF input resistance Single-ended input 3.0 4.7 kΩ
RF input capacitance 3.5 4.0 pF
Mixer output resistance (Pin 20) 1.25 1.5 kΩ
IF section
IF amp gain 50Ω source 39.7 dB
Limiter gain 50Ω source 62.5 dB
Input limiting -3dB, R
17
= 5.1k Test at Pin 18 -113 dBm
AM rejection 80% AM 1kHz 29 34 43 dB
Audio level, R
10
= 100k 15nF de-emphasis 80 150 260 mV
RMS
Unmuted audio level, R
11
= 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, R
9
= 100kΩ
1
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 R
9
= 100kΩ Pin 16 90 dB
RSSI accuracy R
9
= 100kΩ Pin 16 +1.5 dB
IF input impedance 1.40 1.6 kΩ
IF output impedance 0.85 1.0 kΩ
Limiter input impedance 1.40 1.6 kΩ
Unmuted audio output resistance 58 kΩ
Muted audio output resistance 58 kΩ
RF/IF section (int LO)
Unmuted audio level 4.5V = V
CC
, RF level = -27dBm 450 mV
RMS
System RSSI output 4.5V = V
CC
, RF level = -27dBm 4.3 V
NOTE:
1. The generator source impedance is 50Ω, but the SA605 input impedance at Pin 18 is 1500Ω. 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.