SA605 Datasheet, PDF (4/13 Pages) NXP Semiconductors – High performance low power mixer FM IF system

Philips Semiconductors
High performance low power mixer FM IF system
Product specification
SA605
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
f_OSC
Input signal frequency
Crystal oscillator frequency
Noise figure at 45MHz
500
MHz
150
MHz
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
RF input resistance
RF input capacitance
50Ω source
Single-ended input
-1.7
dB
3.0
4.7
kΩ
3.5
4.0
pF
IF section
Mixer output resistance
(Pin 20)
1.25
1.5
kΩ
IF amp gain
Limiter gain
Input limiting -3dB, R₁₇ = 5.1k
AM rejection
50Ω source
50Ω source
Test at Pin 18
80% AM 1kHz
39.7
dB
62.5
dB
-113
dBm
29
34
43
dB
Audio level, R₁₀ = 100k
Unmuted audio level, R₁₁ = 100k
SINAD sensitivity
15nF de-emphasis
150pF de-emphasis
RF level -118dB
80
150
260
mV_RMS
480
mV
16
dB
THD
Total harmonic distortion
-34
-42
dB
S/N
Signal-to-noise ratio
IF RSSI output, R₉ = 100kΩ¹
No modulation for noise
IF level = -118dBm
IF level = -68dBm
73
dB
0
160
650
mV
1.9
2.5
3.1
V
IF level = -18dBm
4.0
4.8
5.6
V
RSSI range
RSSI accuracy
IF input impedance
IF output impedance
Limiter input impedance
Unmuted audio output resistance
Muted audio output resistance
R₉ = 100kΩ Pin 16
R₉ = 100kΩ Pin 16
90
dB
+1.5
dB
1.40
1.6
kΩ
0.85
1.0
kΩ
1.40
1.6
kΩ
58
kΩ
58
kΩ
RF/IF section (int LO)
Unmuted audio level
System RSSI output
4.5V = V_CC, RF level = -27dBm
4.5V = V_CC, RF level = -27dBm
450
mV_RMS
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.
1997 Nov 07
4