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參數(shù)資料
| 型號： | ADM3222AN |
| 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： | DUAL LINE TRANSCEIVER, PDIP18 |
| 封裝： | PLASTIC, MS-001, DIP-18 |
| 文件頁數(shù)： | 6/8頁 |
| 文件大小： | 153K |
| 代理商： | ADM3222AN |
ADM3202/ADM3222/ADM1385
–6–
REV. A
GENERAL DESCRIPTION
The ADM3202/ADM3222/ADM1385 are RS-232 line drivers/
receivers. Step-up voltage converters coupled with level shifting
transmitters and receivers allow RS-232 levels to be developed
while operating from a single +3.3 V supply.
CMOS technology is used to keep the power dissipation to an
absolute minimum, allowing maximum battery life in portable
applications.
The ADM3202/ADM3222/ADM1385 is a modification, en-
hancement and improvement to the AD230–AD241 family and
its derivatives. It is essentially plug-in compatible and does not
have materially different applications.
CIRCUIT DESCRIPTION
The internal circuitry consists of three main sections. These are:
1. A charge pump voltage converter
2. 3.3 V logic to EIA-232 transmitters
3. EIA-232 to 5 V logic receivers.
Charge Pump DC-DC Voltage Converter
The charge pump voltage converter consists of a 200 kHz oscil-
lator and a switching matrix. The converter generates a
±
6.6 V
supply from the input +3.3 V level. This is done in two stages
using a switched capacitor technique as illustrated below. First,
the +3.3 V input supply is doubled to +6.6 V using capacitor
C1 as the charge storage element. The +6.6 V level is then
inverted to generate –6.6 V using C2 as the storage element. C3
is shown connected between V+ and V
CC
, but is equally effec-
tive if connected between V+ and GND.
Capacitors C3 and C4 are used to reduce the output ripple.
Their values are not critical and can be increased if desired.
Capacitor C3 is shown connected between V+ and V
CC
. It is
also acceptable to connect this capacitor between V+ and GND.
If desired, larger capacitors (up to 10
μ
F) can be used for
capacitors C1–C4.
+3.3V TO +6.6V
VOLTAGE
DOUBLER
C1+
C1
–
C5
0.1 F
+
V
CC
V+
0.1 F
10V
+
+0.1 F
6.3V
+3.3V INPUT
+6.6V TO
–
6.6V
VOLTAGE
INVERTER
C2+
C2
–
+
V
–
0.1 F
10V
+
C4
0.1 F
10V
T1
OUT
T1
IN
T2
OUT
T2
IN
EIA/TIA-232
OUTPUTS
R1
OUT
R2
OUT
R1
IN
R2
IN
EIA/TIA-232
INPUTS
*
CMOS
INPUTS
CMOS
OUTPUTS
ADM3202
GND
*
INTERNAL 5k PULL-DOWN RESISTOR
ON EACH RS-232 INPUT
+3.3V TO +6.6V
VOLTAGE
DOUBLER
C1+
C1
–
C5
0.1 F
+
V
CC
V+
0.1 F
10V
+
+0.1 F
6.3V
+3.3V INPUT
+6.6V TO
–
6.6V
VOLTAGE
INVERTER
C2+
C2
–
+
V
–
0.1 F
10V
+
C4
0.1 F
10V
T1
OUT
T1
IN
T2
OUT
T2
IN
EIA/TIA-232
OUTPUTS
R1
OUT
R2
OUT
R1
IN
R2
IN
EIA/TIA-232
INPUTS
*
CMOS
INPUTS
CMOS
OUTPUTS
ADM3222
GND
*
INTERNAL 5k PULL-DOWN RESISTOR
ON EACH RS-232 INPUT
T1
T2
R2
R1
T1
T2
R2
R1
EN
SD
+3.3V TO +6.6V
VOLTAGE
DOUBLER
C1+
C1
–
C5
0.1 F
+
V
CC
V+
0.1 F
10V
+
C3
0.1 F
6.3V
+3.3V INPUT
+6.6V TO
–
6.6V
VOLTAGE
INVERTER
C2+
C2
–
+
V
–
0.1 F
10V
+
C4
0.1 F
10V
T1
OUT
T1
IN
T2
OUT
T2
IN
EIA/TIA-232
OUTPUTS
R1
OUT
R2
OUT
R1
IN
R2
IN
EIA/TIA-232
INPUTS
*
CMOS
INPUTS
CMOS
OUTPUTS
ADM1385
GND
*
INTERNAL 5k PULL-DOWN RESISTOR
ON EACH RS-232 INPUT
T1
T2
R2
R1
DD
SD
+
Figure 8. Typical Operating Circuits
1 s/DIV
T1
2V/DIV
T1
5V/DIV
Figure 7. 230 kbps Data Transmission
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| ADM3222ANZ | 功能描述:IC TXRX RS232 3.3V W/SD 18-DIP RoHS:是 類別:集成電路 (IC) >> 接口 - 驅動器，接收器，收發(fā)器 系列:- 產(chǎn)品培訓模塊:RS-232 & USB Transceiver 標準包裝:2,000 系列:- 類型:收發(fā)器 驅動器/接收器數(shù):1/1 規(guī)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 |
| ADM3222ARS | 功能描述:IC TX/RX RS-232 3.3V W/SD 20SSOP RoHS:否 類別:集成電路 (IC) >> 接口 - 驅動器，接收器，收發(fā)器 系列:- 標準包裝:121 系列:- 類型:收發(fā)器 驅動器/接收器數(shù):1/1 規(guī)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 |
| ADM3222ARS-REEL | 功能描述:IC TXRX RS232 3.3V W/SD 20SSOP RoHS:否 類別:集成電路 (IC) >> 接口 - 驅動器，接收器，收發(fā)器 系列:- 標準包裝:121 系列:- 類型:收發(fā)器 驅動器/接收器數(shù):1/1 規(guī)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 |
| ADM3222ARS-REEL7 | 功能描述:IC TXRX RS232 3.3V W/SD 20SSOP RoHS:否 類別:集成電路 (IC) >> 接口 - 驅動器，接收器，收發(fā)器 系列:- 標準包裝:121 系列:- 類型:收發(fā)器 驅動器/接收器數(shù):1/1 規(guī)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 |
| ADM3222ARSZ | 功能描述:IC TX/RX RS-232 3.3V W/SD 20SSOP RoHS:是 類別:集成電路 (IC) >> 接口 - 驅動器，接收器，收發(fā)器 系列:- 產(chǎn)品培訓模塊:RS-232 & USB Transceiver 標準包裝:2,000 系列:- 類型:收發(fā)器 驅動器/接收器數(shù):1/1 規(guī)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 |
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