SA676 查看數據表（PDF） - NXP Semiconductors.
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SA676 Datasheet PDF : 22 Pages
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NXP Semiconductors
SA676
Low-voltage mixer FM IF system
11. Dynamic characteristics
Table 6. Dynamic characteristics
Tamb = 25 C; VCC = 3 V; unless specified otherwise. RF frequency = 45 MHz + 14.5 dBV RF input step-up.
IF frequency = 455 kHz; R17 = 2.4 k and R18 = 3.3 k. RF level = 45 dBm; FM modulation = 1 kHz with 5 kHz peak
deviation. Audio output with de-emphasis filter and C-message weighted filter. Test circuit Figure 9. 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 will improve many of the listed parameters.
Symbol Parameter
Conditions
Min Typ Max Unit
Mixer/oscillator section (external LO = 220 mV RMS value)
fi
input frequency
fosc
oscillator frequency
NF
noise figure
at 45 MHz
-
100 -
MHz
-
100 -
MHz
-
7.0 -
dB
IP3I
input third-order intercept point 50 source;
f1 = 45.0 MHz; f2 = 45.06 MHz;
input RF level = 52 dBm
-
10 -
dBm
Gp(conv) conversion power gain
matched 14.5 dBV step-up
50 source
10
17
-
dB
-
2.5 -
dB
Ri(RF)
Ci(RF)
Ro(mix)
IF section
RF input resistance
RF input capacitance
mixer output resistance
single-ended input
MIXER_OUT pin
-
8
-
k
-
3.0 4.0 pF
1.25 1.5 -
k
Gamp(IF)
Glim
AM
Vo(aud)
SINAD
IF amplifier gain
50 source
limiter gain
50 source
AM rejection
30 % AM 1 kHz
audio output voltage
gain of two
signal-to-noise-and-distortion ratio IF level 110 dBm
-
44
-
dB
-
58
-
dB
-
50
-
dB
60
120 -
mV
-
17
-
dB
THD
total harmonic distortion
-
55 -
dB
S/N
signal-to-noise ratio
no modulation for noise
-
60
-
dB
Vo(RSSI) RSSI output voltage
IF; R9 = 2 k
IF level = 110 dBm
[1]
-
0.5 0.9 V
IF level = 50 dBm
-
1.7 2.2 V
RSSI(range) RSSI range
Zi(IF)
IF input impedance
Zo(IF)
IF output impedance
Zi(lim)
limiter input impedance
Zo(lim)
limiter output impedance
Vo(RMS) RMS output voltage
RF/IF section (internal LO)
IF_AMP_IN pin
IF_AMP_OUT pin
LIMITER_IN pin
LIMITER_OUT pin
LIMITER_OUT pin
-
70
-
dB
1.3 1.5 -
k
-
0.3 -
k
1.3 1.5 -
k
-
0.3 -
k
-
130 -
mV
SINAD signal-to-noise-and-distortion ratio system; RF level = 114 dBm
-
12
-
dB
[1] The generator source impedance is 50 , but the SA676 input impedance at IF_AMP_IN (pin 18) is 1500 . As a result, IF level refers
to the actual signal that enters the SA676 input (IF_AMP_IN, pin 18), which is about 21 dB less than the ‘available power’ at the
generator.
SA676
Product data sheet
All information provided in this document is subject to legal disclaimers.
Rev. 3 — 19 July 2012
© NXP B.V. 2012. All rights reserved.
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