SA625DK データシートの表示（PDF） - Philips Electronics
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SA625DK Datasheet PDF : 14 Pages
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Philips Semiconductors
High performance low power mixer FM IF system
with high-speed RSSI
Product specification
SA625
AC ELECTRICAL CHARACTERISTICS
TA = 25°C; VCC = +6V, unless otherwise stated. RF frequency = 45MHz + 14.5dBV RF input step-up; IF frequency = 455kHz; R17 = 5.1k; RF
level = -45dBm; FM modulation = 1kHz with ±8kHz peak deviation. Audio output with C-message weighted filter and de-emphasis capacitor.
Test circuit Figure 3. The parameters listed below are tested using automatic test equipment to assure consistent electrical characterristics.
The limits do not represent the ultimate performance limits of the device. Use of an optimized RF layout will improve many of the listed parame-
ters.
LIMITS
SYMBOL
PARAMETER
TEST CONDITIONS
SA625
UNITS
MIN
TYP
MAX
Mixer/Osc section (ext LO = 300mV)
fIN
fOSC
Input signal frequency
Crystal oscillator frequency
Noise figure at 45MHz
500
MHz
150
MHz
5.0
dB
Third-order input intercept point
f1 = 45.0; f2 = 45.06MHz
-10
dBm
Conversion power gain
Matched 14.5dBV step-up
10
13
15
dB
50Ω source
-1.7
dB
RF input resistance
Single-ended input
3.0
4.7
kΩ
RF input capacitance
3.5
4.0
pF
Mixer output resistance
(Pin 20)
1.25
1.5
kΩ
IF section
IF amp gain
50Ω source
39.7
dB
Limiter gain
50Ω source
62.5
dB
Input limiting -3dB, R17 = 5.1k
AM rejection
Test at Pin 18
80% AM 1kHz
-113
dBm
29
34
43
dB
Audio level, R10 = 100k
Unmuted audio level, R11 = 100k
SINAD sensitivity
15nF de-emphasis
150pF de-emphasis
RF level -118dB
80
150
260
mVRMS
480
mV
16
dB
THD
Total harmonic distortion
-34
-42
dB
S/N
Signal-to-noise ratio
No modulation for noise
73
dB
IF RSSI output, R9 = 100kΩ1
IF level = -118dBm
IF level = -68dBm
0
160
650
mV
1.9
2.5
3.1
V
IF level = -18dBm
4.0
4.8
5.6
V
IF frequency = 455kHz
RF level = -56dBm
1.2
µs
IF RSSI output rise time
RF level = -28dBm
1.2
µs
(10kHz pulse, no 455kHz filter)
IF frequency = 10.7MHz
(no RSSI bypass capacitor)
RF level = -56dBm
1.2
µs
RF level = -28dBm
1.1
µs
IF frequency = 455kHz
RF level = -56dBm
2.1
µs
IF RSSI output fall time
RF level = -28dBm
7.6
µs
(10kHz pulse, no 455kHz filter)
IF frequency = 10.7MHz
(no RSSI bypass capacitor)
RF level = -56dBm
2.0
µs
RF level = -28dBm
7.3
µs
RSSI range
RSSI accuracy
IF input impedance
R9 = 100kΩ Pin 16
90
dB
R9 = 100kΩ Pin 16
+1.5
dB
1.40
1.6
kΩ
IF output impedance
0.85
1.0
kΩ
Limiter intput impedance
1.40
1.6
kΩ
Limiter output impedance
300
Ω
Limiter output level with no load
280
mVRMS
1997 Nov 07
4
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