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參數(shù)資料
| 型號： | SA624D |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | 接收器 |
| 英文描述： | High performance low power FM IF system with high-speed RSSI |
| 中文描述： | FM, AUDIO DEMODULATOR, PDSO16 |
| 封裝： | 3.90 MM, PLASTIC, SOT-109-1, MS-012AC, SO-16 |
| 文件頁數(shù)： | 11/15頁 |
| 文件大?。?/td> | 161K |
| 代理商： | SA624D |
Philips Semiconductors
Product specification
SA624
High performance low power FM IF system with
high-speed RSSI
1997 Nov 07
11
will require careful attention to limiter interstage component
selection. This will be especially true with high IF frequencies which
require insertion loss or impedance reduction for stability.
At low frequencies the RSSI makes an excellent logarithmic AC
voltmeter.
For data applications the RSSI is effective as an amplitude shift
keyed (ASK) data slicer. If a comparator is applied to the RSSI and
the threshold set slightly above the no signal level, when an in-band
signal is received the comparator will be sliced. Unlike FSK
demodulation, the maximum data rate is somewhat limited. An
internal capacitor limits the RSSI frequency response to about
100kHz. At high data rates the rise and fall times will not be
symmetrical.
The RSSI output is a current-to-voltage converter similar to the
audio outputs. However, an external resistor is required. With a
91k
resistor, the output characteristic is 0.5V for a 10dB change in
the input amplitude.
Additional Circuitry
Internal to the SA624 are voltage and current regulators which have
been temperature compensated to maintain the performance of the
device over a wide temperature range. These regulators are not
accessible to the user.
200
175
150
125
100
75
50
25
0
0.95
0.975
1.0
1.025
1.05
Φ
Q = 100
Q = 80
Q = 60
Q = 20
Q = 10
SR00451
Figure 12. Phase vs Normalized IF Frequency
ω
ω
1
= 1 +
ω
ω
1
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