SA636 Datasheet, PDF (13/17 Pages) NXP Semiconductors – Low voltage high performance mixer FM IF system with high-speed RSSI

Philips Semiconductors
Low voltage high performance mixer FM IF system
with high-speed RSSI
Product specification
SA636
Table 1. DECT Application Circuit Electrical Characteristics
RF frequency = 110.592MHz; IF frequency = 9.8MHz; RF level = -45dBm; FM modulation = 100kHz with ±288kHz peak deviation.
SYMBOL
PARAMETER
TEST CONDITIONS
TYPICAL
Mixer/Osc section (ext LO = 160mV_RMS)
PG
Conversion power gain
13
NF
Noise Figure at 110MHz
12
IIP3
Third order input intercept
Matched f1 = 110.592; f2 = 110.892MHz
-15
R_IN
RF input resistance
690
C_IN
RF input capacitance
3.6
IF section
IF amp gain
330Ω load
38
Limiter amp gain
330Ω load
54
Data level
3dB data bandwidth
R_LOAD = 3kΩ
130
700
RF/IF section (internal LO)
System RSSI output
RF level = -10dBm
1.4
System S/N¹
RF level = -83dBm
10
NOTE:
1. 10dB S/N corresponds to BER = 10^-3.
UNITS
dB
dB
dBm
Ω
pF
dB
dB
mV_RMS
kHz
V
dB
RF GENERATOR
110.592MHz
LO / GENERATOR
120.392MHz
SA636 DEMO BOARD
RSSI DATA
DC VOLTMETER
V_CC = 3V
SCOPE
SPECTRUM
ANALYZER
SR00502
Figure 11. SA636 Application Circuit Test Set Up
NOTES:
1. RF generator: Set your RF generator at 110.592MHz, use a 100kHz modulation frequency and a ±288kHz deviation.
2. Layout: The layout is very critical in the performance of the receiver. We highly recommend our demo board layout.
3. RSSI: The smallest RSSI voltage (i.e., when no RF input is present and the input is terminated) is a measure of the quality of the layout and
design. If the lowest RSSI voltage is 500mV or higher, it means the receiver is in regenerative mode. In that case, the receiver sensitivity
will be worse than expected.
4. Supply bypass and shielding: All of the inductors, the quad tank, and their shield must be grounded. A 0.1µF bypass capacitor on the
supply pin improves sensitivity.
1997 Nov 07
13