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參數(shù)資料
| 型號(hào)： | SA626DK |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | 接收器 |
| 英文描述： | Low voltage high performance mixer FM IF system with high-speed RSSI |
| 中文描述： | FM, AUDIO SINGLE CHIP RECEIVER, PDSO20 |
| 封裝： | PLASTIC, SHRINK, SO-20 |
| 文件頁(yè)數(shù)： | 12/16頁(yè) |
| 文件大?。?/td> | 231K |
| 代理商： | SA626DK |
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Philips Semiconductors
Product specification
SA626
Low voltage high performance mixer FM IF system
with high-speed RSSI
1997 Sept 25
12
RF GENERATOR
240MHz
HP8903A DISTORTION
ANALYZER
SCOPE
DC VOLTMETER
DE-EMPHASIS
FILTER
RSSI
AUDIO
SA626 DEMO BOARD
LO / GENERATOR
229.3MHz
V
CC
= 3V
C–MESSAGE
SR00479
Figure 10. SA626 Application Circuit Test Set Up
NOTES:
1. C-message: The C-message and de-emphasis filter combination has a peak gain of 10 for accurate measurements. Without the gain, the
measurements may be affected by the noise of the scope and HP8903A analyzer. The de-emphasis filter has a fixed -6dB/Octave slope
between 300Hz and 3kHz.
2. Ceramic filters: The ceramic filter can be SFE10.7MA5-A made by Murata which has 280kHz IF bandwidth.
3. RF generator: Set your RF generator at 240.000MHz, use a 1kHz modulation frequency and a 125kHz deviation.
4. Sensitivity: The measured typical sensitivity for 12dB SINAD should be 0.54
μ
V or –112dBm at the RF input.
5. Layout: The layout is very critical in the performance of the receiver. We highly recommend our demo board layout.
6. 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.
7. Supply bypass and shielding: All of the inductors, the quad tank, and their shield must be grounded. A 0.1
μ
F bypass capacitor on the
supply pin improves sensitivity.
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