Philips SA615 - Manual (Page 4)

Philips Semiconductors Product specification
SA615 High 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 SA615 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 = 45.00; f2 = 45.06MHz -12 dBm
Conversion power gain Matched 14.5dBV step-up 8.0 13 dB
50
Ω
source -1.7 dB
RF input resistance Single-ended input 3.0 4.7 k Ω
RF input capacitance 3.5 4.0 pF
Mixer output resistance (Pin 20) 1.25 1.50 k Ω
IF section
IF amp gain 50 Ω source 39.7 dB
Limiter gain 50
Ω
source 62.5 dB
Input limiting -3dB, R
17
= 5.1k Test at Pin 18 -109 dBm
AM rejection 80% AM 1kHz 25 33 43 dB
Audio level, R
10
= 100k 15nF de-emphasis 60 150 260
mV
RM
S
Unmuted audio level, R
11
= 100k 150pF de-emphasis 530 mV
SINAD sensitivity RF level -118dB 12 dB
THD Total harmonic distortion -30 -42 dB
S/N Signal-to-noise ratio No modulation for noise 68 dB
IF RSSI output, R
9
= 100k
Ω 1 IF level = -118dBm 0 160 800 mV
IF level = -68dBm 1.7 2.5 3.3 V
IF level = -18dBm 3.6 4.8 5.8 V
RSSI range R
9
= 100k Ω Pin 16 80 dB
RSSI accuracy R
9
= 100k
Ω
Pin 16 +2 dB
IF input impedance 1.40 1.6 k
Ω
IF output impedance 0.85 1.0 k
Ω
Limiter intput impedance 1.40 1.6 k
Ω
Unmuted audio output resistance 58 k
Ω
Muted audio output resistance 58 k
Ω
RF/IF section (int LO)
Unmuted audio level 4.5V = V
CC
, RF level = -27dBm 450
mV
RM
S
System RSSI output 4.5V = V
CC
, RF level = -27dBm 4.3 V
NOTE:
1. The generator source impedance is 50
Ω
, but the SA615 input impedance at Pin 18 is 1500
Ω
. As a result, IF level refers to the actual signal
that enters the SA615 input (Pin 8) which is about 21dB less than the ”available power” at the generator.