SA624D 查看數據表（PDF） - Philips Electronics
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SA624D Datasheet PDF : 15 Pages
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Philips Semiconductors
High performance low power FM IF system with
high-speed RSSI
Product specification
SA624
AC ELECTRICAL CHARACTERISTICS
Typical reading at TA = 25°C; VCC = +6V, unless otherwise stated. IF frequency = 455kHz; IF level = -47dBm; 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 parameters.
LIMITS
SYMBOL
PARAMETER
TEST CONDITIONS
SA624
UNITS
MIN
TYP
MAX
Input limiting -3dB
Test at Pin 16
-92
dBm/50Ω
AM rejection
80% AM 1kHz
30
34
dB
THD
Recovered audio level
Recovered audio level
Total harmonic distortion
15nF de-emphasis
150pF de-emphasis
80
175
260
mVRMS
530
mVRMS
-34
-42
dB
S/N
Signal-to-noise ratio
No modulation for noise
73
dB
RF level = -118dBm
0
160
650
mV
RSSI output1
RF level = -68dBm
1.9
2.65
3.1
V
RF level = -18dBm
4.0
4.85
5.6
V
IF freq. = 455kHz
IF level = -44dBm
1.1
µs
RSSI output rise time
IF level = -16dBm
1.2
µs
(10kHz pulse, no IF filter)
IF freq. = 10.7MHz
IF level = -44dBm
1.2
µs
IF level = -16dBm
1.1
µs
IF freq. = 455kHz
IF level = -44dBm
1.3
µs
RSSI output fall time
IF level = -16dBm
4.7
µs
(10kHz pulse, no IF filter)
IF freq. = 10.7MHz
IF level = -44dBm
1.6
µs
IF level = -16dBm
4.2
µs
RSSI range
R4 = 100k (Pin 5)
90
dB
RSSI accuracy
R4 = 100k (Pin 5)
+1.5
dB
IF input impedance
1.4
1.6
kΩ
IF output impedance
0.85
1.0
kΩ
Limiter input impedance
1.4
1.6
kΩ
Limiter output impedance
300
Ω
Limiter output level no load
Unmuted audio output resistance
280
mVRMS
58
kΩ
Muted audio output resistance
58
kΩ
NOTE:
1. SA604 data sheets refer to power at 50Ω input termination; about 21dB less power actually enters the internal 1.5k input.
SA604 (50)
SA624 (1.5k)/SA605 (1.5k
-97dBm
-118dBm
-47dBm
-68dBm
+3dBm
-18dBm
1997 Nov 07
4
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