SA58641 Datasheet, PDF (4/17 Pages) NXP Semiconductors – High performance mixer FM IF system with high-speed RSSI

Philips Semiconductors
High performance mixer FM IF system
with high-speed RSSI
Objective data
SA58641
AC ELECTRICAL CHARACTERISTICS
T_amb = 25 °C; V_CC = +5 V, unless otherwise stated. RF frequency = 240.05 MHz + 14.5 dBV RF input step-up; IF frequency = 10.7 MHz;
RF level = –45 dBm; FM modulation = 1 kHz with ±125 kHz peak deviation. Audio output with C-message weighted filter and de-emphasis
capacitor. Test circuit Figure 1. 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
TEST CONDITIONS
LIMITS
UNITS
MIN
TYP
MAX
Mixer/Osc section (ext LO = 160mV_RMS)
f_IN
Input signal frequency
f_OSC External oscillator (buffer)
Noise figure at 240 MHz
500
MHz
500
MHz
12
dB
Third-order input intercept point
Matched f1=240.05 MHz; f2=240.35 MHz
–16
dBm
Conversion power gain
Matched 14.5 dBV step-up
8
11
dB
RF input resistance
Single-ended input
700
Ω
RF input capacitance
3.5
pF
Mixer output resistance
(Pin 20)
330
Ω
IF section
IF amp gain
330 Ω load
38
dB
Limiter gain
330 Ω load
54
dB
Input limiting –3dB
Test at Pin 18
–105
dBm
AM rejection
80% AM 1 kHz
50
dB
Data level
3 dB data bandwidth
R_LOAD = 100 kΩ
120
130
600
700
mV_RMS
kHz
SINAD sensitivity
RF level = –111 dBm
16
dB
THD Total harmonic distortion
–43
–38
dB
S/N Signal-to-noise ratio
No modulation for noise
60
dB
IF level = –90 dBm
0.6
1.0
V
IF RSSI output with buffer
IF level = –45 dBm
0.2
1.2
1.8
V
IF level = –10 dBm
0.8
1.6
2.3
V
IF RSSI output rise time
IF frequency = 10.7 MHz
(10kHz pulse, no 10.7MHz filter)
RF level = –56 dBm
1.2
µs
(no RSSI bypass capacitor)
RF level = –28 dBm
1.1
µs
IF RSSI output fall time
IF frequency = 10.7 MHz
(10 kHz pulse, no 10.7 MHz filter)
RF level = –56 dBm
2.0
µs
(no RSSI bypass capacitor)
RF level = –28 dBm
7.3
µs
RSSI range
70
dB
RSSI accuracy
±2.0
dB
IF input impedance
330
Ω
IF output impedance
330
Ω
Limiter input impedance
330
Ω
Limiter output impedance
300
Ω
Limiter output level with no load
RF/IF section (int LO)
130
mV_RMS
System RSSI output
RF level = –10 dBm
1.4
V
System SINAD
RF level = –95 dBm
12
dB
2004 Dec 16
4