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參數資料
| 型號： | ADM208AN |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | 通用總線功能 |
| 英文描述： | 5V High-Speed RS-232 Transceivers with 0.1uF Capacitors |
| 中文描述： | QUAD LINE TRANSCEIVER, PDIP24 |
| 封裝： | PLASTIC, MO-095AG, DIP-24 |
| 文件頁數： | 13/16頁 |
| 文件大小： | 204K |
| 代理商： | ADM208AN |
ADM206E/ADM207E/ADM208E/ADM211E/ADM213E
REV. B
–13–
Conducted emissions are measured by monitoring the line
power supply. The equipment used consists of a LISN (Line
Impedance Stabilizing Network) which essentially presents a
fixed impedance at RF, and a spectrum analyzer. The spectrum
analyzer scans for emissions up to 30 MHz and a plot for the
ADM211E is shown in Figure 32.
S1
S2
C1
S4
S3
C3
V+ = 2V
CC
V
CC
INTERNAL
OSCILLATOR
GND
V
CC
Figure 30. Charge Pump Voltage Doubler
1
2
SWITCHING GLITCHES
Figure 31. Switching Glitches
LOG FREQUENCY – MHz
80
70
0
0.3
30
0.6
1
60
50
10
40
30
20
3
6
18
LIMIT
d
m
V
Figure 32. Conducted Emissions Plot
RADIATED EMISSIONS
Radiated emissions are measured at frequencies in excess of
30 MHz. RS-232 outputs designed for operation at high baud
rates while driving cables can radiate high frequency EM energy.
The reasons already discussed which cause conducted emissions
can also be responsible for radiated emissions. Fast RS-232
output transitions can radiate interference, especially when
lightly loaded and driving unshielded cables. Charge pump
devices are also prone to radiating noise due to the high fre-
quency oscillator and high voltages being switched by the charge
pump. The move towards smaller capacitors in order to con-
serve board space has resulted in higher frequency oscillators
being employed in the charge pump design. This has resulted in
higher levels of emission, both conducted and radiated.
The RS-232 outputs on the ADM2xxE products feature a con-
trolled slew rate in order to minimize the level of radiated emis-
sions, yet are fast enough to support data rates up to 230 kBaud.
DUT
TURNTABLE
RADIATED NOISE
ADJUSTABLE
ANTENNA
TO
RECEIVER
Figure 33. Radiated Emissions Test Setup
Figure 34 shows a plot of radiated emissions vs. frequency. This
shows that the levels of emissions are well within specifications
without the need for any additional shielding or filtering compo-
nents. The ADM2xxE was operated at maximum baud rates
and configured as in a typical RS-232 interface.
Testing for radiated emissions was carried out in a shielded
anechoic chamber.
START 30.0 MHz
STOP 200.0 MHz
LIMIT
d
m
V
80
70
60
50
40
30
20
10
0
Figure 34. Radiated Emissions Plot
相關PDF資料 |
PDF描述 |
|---|---|
| ADM208AR | 5V High-Speed RS-232 Transceivers with 0.1uF Capacitors |
| ADM207EAR | 5V High-Speed RS-232 Transceivers with 0.1uF Capacitors |
| ADM208 | 5V High-Speed RS-232 Transceivers with 0.1uF Capacitors |
| ADM211E | 5V High-Speed RS-232 Transceivers with 0.1uF Capacitors |
| ADM211EAR | 5V High-Speed RS-232 Transceivers with 0.1uF Capacitors |
相關代理商/技術參數 |
參數描述 |
|---|---|
| ADM208ANZ | 功能描述:IC TXRX RS-232 5V 0.1UF 24-DIP RoHS:是 類別:集成電路 (IC) >> 接口 - 驅動器，接收器，收發器 系列:- 產品培訓模塊:RS-232 & USB Transceiver 標準包裝:2,000 系列:- 類型:收發器 驅動器/接收器數:1/1 規程:RS232 電源電壓:3 V ~ 5.5 V 安裝類型:表面貼裝 封裝/外殼:16-SSOP（0.209"，5.30mm 寬） 供應商設備封裝:16-SSOP 包裝:帶卷 (TR) 其它名稱:296-19849-2 |
| ADM208AR | 功能描述:IC TX/RX RS-232 5V 0.1UF 24SOIC RoHS:否 類別:集成電路 (IC) >> 接口 - 驅動器，接收器，收發器 系列:- 標準包裝:27 系列:- 類型:收發器 驅動器/接收器數:3/3 規程:RS232，RS485 電源電壓:4.75 V ~ 5.25 V 安裝類型:表面貼裝 封裝/外殼:28-SOIC（0.295"，7.50mm 寬） 供應商設備封裝:28-SOIC 包裝:管件 |
| ADM208AR-REEL | 功能描述:IC TXRX RS-232 5V 0.1UF 24SOIC RoHS:否 類別:集成電路 (IC) >> 接口 - 驅動器，接收器，收發器 系列:- 標準包裝:121 系列:- 類型:收發器 驅動器/接收器數:1/1 規程:RS422，RS485 電源電壓:3 V ~ 3.6 V 安裝類型:表面貼裝 封裝/外殼:10-WFDFN 裸露焊盤 供應商設備封裝:10-DFN（3x3） 包裝:管件 |
| ADM208ARS | 制造商:Analog Devices 功能描述:Quad Transmitter/Receiver RS-232 24-Pin SSOP |
| ADM208ARS-REEL | 制造商:Analog Devices 功能描述:Quad Transmitter/Receiver RS-232 24-Pin SSOP T/R |
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