SA604A_15 Datasheet, PDF (8/31 Pages) NXP Semiconductors – High-performance low-power FM IF system

NXP Semiconductors
SA604A
High-performance low-power FM IF system
11. Dynamic characteristics
Table 7. Dynamic characteristics
Typical reading at T_amb = 25 C; V_CC = 6 V, unless specified otherwise. IF frequency = 455 kHz; IF level = 47 dBm;
FM modulation = 1 kHz with 8 kHz peak deviation. Audio output with C-message weighted filter and de-emphasis capacitor.
Test circuit Figure 14. 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
input limiting -3 dB
test at pin IF_AMP_INPUT;
per 50 
-
92
-
dBm
_AM
AM rejection
80 % AM 1 kHz
30
34
-
dB
recovered audio level
15 nF de-emphasis; RMS value
80
175
260
mV
150 pF de-emphasis; RMS value
-
530
-
mV
THD
total harmonic distortion
34
42
-
dB
S/N
signal-to-noise ratio
no modulation for noise
-
73
-
dB
V_o(RSSI)
RSSI output voltage
RF level = 118 dBm
RF level = 68 dBm
[1] ₀
[1] _1.9
160
650
mV
2.65 3.1
V
RF level = 18 dBm
[1] _4.0
4.85 5.6
V
_RSSI(range) RSSI range
RSSI accuracy
R4 = 100 k (pin RSSI_OUTPUT)
-
90
-
dB
R4 = 100 k (pin RSSI_OUTPUT)
-
1.5 -
dB
Z_i(IF)
Z_o(IF)
Z_i(lim)
R_o
IF input impedance
IF output impedance
limiter input impedance
output resistance
unmuted audio
muted audio
1.4
1.6
-
k
0.85 1.0
-
k
1.4
1.6
-
k
-
58
-
k
-
58
-
k
[1] SA604 data sheet refers to power at 50  input termination; about 21 dB less power actually enters the internal 1.5 k input.
See Table 8.
The SA605 and SA604A are both derived from the same basic die. The SA605 performance plots are directly applicable to the SA604A.
Table 8. SA604 versus SA604A RSSI output voltage
SA604 (50 )
SA604A (1.5 k) / SA605 (1.5 k)
97 dBm
118 dBm
47 dBm
68 dBm
+3 dBm
18 dBm
SA604A
Product data sheet
All information provided in this document is subject to legal disclaimers.
Rev. 4.1 — 30 March 2015
© NXP Semiconductors N.V. 2015. All rights reserved.
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