SA605
NXP Semiconductors
High performance low power mixer FM IF system
10. Dynamic characteristics
Table 7.
Dynamic characteristics
Tamb = 25 C; VCC = +6 V; unless specified otherwise. RF frequency = 45 MHz + 14.5 dBV RF input step-up.
IF frequency = 455 kHz; R17 = 5.1 k; RF level = 45 dBm; FM modulation = 1 kHz with 8 kHz peak deviation.
Audio output with C-message weighted filter and de-emphasis capacitor. Test circuit Figure 7. The parameters listed below
are tested using automatic test equipment to assure consistent electrical characteristics. The limits do not represent the
ultimate performance limits of the device. Use of an optimized RF layout improves many of the listed parameters.
Symbol
Parameter
Conditions
Min
Typ
Max
Unit
Mixer/oscillator section (external LO = 300 mV)
fi
input frequency
-
500
150
5.0
10
13
-
MHz
MHz
dB
fosc
oscillator frequency
noise figure
-
-
NF
at 45 MHz
-
-
IP3i
Gp(conv)
input third-order intercept point
conversion power gain
FL1 = 45.0 MHz; FL2 = 45.06 MHz
matched 14.5 dBV step-up
50 source
-
-
dBm
dB
10
-
15
1.7
4.7
3.5
1.5
-
dB
Ri(RF)
RF input resistance
RF input capacitance
mixer output resistance
single-ended input
3.0
-
-
k
Ci(RF)
4.0
-
pF
Ro(mix)
IF section
Gamp(IF)
Glim
MIXER_OUT pin
1.25
k
IF amplifier gain
limiter gain
50 source
50 source
-
-
-
39.7
62.5
113
-
-
-
dB
dB
Pi(IF)
IF input power
for 3 dB input limiting sensitivity;
dBm
R17 = 5.1 k; test at IF_AMP_IN pin
AM
AM rejection
audio level
80 % AM 1 kHz
29
80
34
43
dB
RMS value; R10 = 100 k;
150
260
mV
15 nF de-emphasis
unmuted audio level
R11 = 100 k; 150 pF de-emphasis
-
480
16
-
-
-
-
mV
dB
dB
dB
SINAD
THD
signal-to-noise-and-distortion ratio RF level 118 dB
-
total harmonic distortion
34
42
73
S/N
signal-to-noise ratio
RSSI output voltage
no modulation for noise
-
[1]
Vo(RSSI)
IF; R9 = 100 k
IF level = 118 dBm
0
160
2.5
4.8
90
650
mV
V
IF level = 68 dBm
1.9
3.1
IF level = 18 dBm
4.0
5.6
V
RSSI(range) RSSI range
R9 = 100 k; IF_AMP_OUT pin
R9 = 100 k; IF_AMP_OUT pin
-
-
-
-
-
-
-
-
dB
dB
k
k
k
k
k
RSSI
Zi(IF)
Zo(IF)
Zi(lim)
Ro
RSSI variation
-
1.5
1.6
1.0
1.6
58
IF input impedance
IF output impedance
limiter input impedance
output resistance
1.40
0.85
1.40
-
unmuted audio
muted audio
-
58
SA605
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© NXP Semiconductors N.V. 2014. All rights reserved.
Product data sheet
Rev. 5 — 14 November 2014
7 of 25