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| 型号： | ADM3101EACPZ-REEL |
| 厂商： | Analog Devices Inc |
| 文件页数： | 11/12页 |
| 文件大小： | 0K |
| 描述： | IC TXRX RS-232 3.3V 15KV 12LFCSP |
| 标准包装： | 5,000 |
| 类型： | 收发器 |
| 驱动器/接收器数： | 1/1 |
| 规程： | RS232 |
| 电源电压： | 3 V ~ 3.6 V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 12-VFQFN 裸露焊盘，CSP |
| 供应商设备封装： | 12-LFCSP-VQ |
| 包装： | 带卷 (TR) |
ADM3101E
Rev. C | Page 8 of 12
THEORY OF OPERATION
The ADM3101E is a single-channel RS-232 line driver/receiver.
Step-up voltage converters, coupled with level shifting trans-
mitters 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.
CIRCUIT DESCRIPTION
The internal circuitry consists of the following main sections:
A charge pump voltage converter
A 3.3 V logic to an EIA/TIA-232E transmitter
An EIA/TIA-232E to a 3.3 V logic receiver
ADM3101E
GND
+3.3V INPUT
+
C1
0.1F
16V
C2
0.1F
16V
+
T
R
+3.3V TO +6.6V
VOLTAGE DOUBLER
+6.6V TO –6.6V
VOLTAGE INVERTER
C1+
C1–
C2+
C2–
TIN
ROUT
CMOS
INPUT
CMOS
OUTPUT
RIN
VCC
V+
V–
TOUT
C5
0.1F
C3
0.1F
6.3V
C4
0.1F
16V
EIA/TIA-232E
OUTPUT
EIA/TIA-232E
INPUT*
*INTERNAL 5k PULL-DOWN
RESISTOR ON THE RS-232 INPUT.
0
67
66
-01
1
Figure 12. Typical Operating Circuit
Charge Pump 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 (when unloaded) from the 3.3 V input level. This is achieved
in two stages by using a switched capacitor technique, as illustrated
to +6.6 V by using 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 VCC but is
equally effective if connected between V+ and GND.
The C3 and C4 capacitors are used to reduce the output ripple.
The values are not critical and can be increased, if desired. Larger
capacitors (up to 10 μF) can also be used in place of the C1, C2,
C3, and C4 capacitors.
GND
C3
C1
S1
S2
S3
S4
V+ = 2VCC
+
INTERNAL
OSCILLATOR
VCC
06
76
6-
0
12
Figure 13. Charge Pump Voltage Doubler
GND
C4
C2
S1
S2
S3
S4
GND
+
INTERNAL
OSCILLATOR
V+
V– = –(V+)
FROM
VOLTAGE
DOUBLER
06
76
6-
0
13
Figure 14. Charge Pump Voltage Inverter
3.3 V Logic to EIA/TIA-232E Transmitter
The transmitter driver converts the 3.3 V logic input levels
into RS-232 output levels. When driving an RS-232 load with
VCC = 3.3 V, the output voltage swing is typically ±6 V. Internally,
the TIN pin has a weak pull-up that allows it to be driven by an
open-drain output, but the maximum operating data rate is
reduced when the TIN pin is driven by an open-drain pin.
EIA/TIA-232E to 3.3 V Logic Receiver
The receiver is an inverting level shifter that accepts the RS-232
input level and translates it into a 3.3 V logic output level. The
input has an internal 5 kΩ pull-down resistor to ground and is
protected against overvoltages of up to ±30 V. An unconnected
input is pulled to 0 V by the internal 5 kΩ pull-down resistor,
which, therefore, results in a Logic 1 output level for an uncon-
nected input or for an input connected to GND.
The receiver has a Schmitt trigger input with a hysteresis level
of 0.4 V, which ensures error-free reception for both a noisy
input and for an input with slow transition times.
CMOS Input Voltage Thresholds
The CMOS input and output pins (TIN and ROUT) of the
ADM3101E are designed to interface with 1.8 V logic
thresholds when VCC = 3.3 V.
The CMOS input and output pins (TIN and ROUT) of the
ADM3101E are also designed to interface with TTL/CMOS
logic thresholds when VCC = 5 V.
ESD Protection on RS-232 and CMOS I/O Pins
All RS-232 (TOUT and RIN) and CMOS (TIN and ROUT) inputs
and outputs are protected against electrostatic discharges (up
to ±15 kV).
HIGH BAUD RATE
The ADM3101E features high slew rates, permitting data trans-
mission at rates well in excess of the EIA/RS-232 specifications.
The RS-232 voltage levels are maintained at data rates of up to
460 kbps, even under worst-case loading conditions, when TIN is
driven by a push-pull output. The slew rate is internally controlled
to less than 30 V/μs to minimize EMI interference.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| ADM3101EACPZ-REEL1 | 制造商:AD 制造商全称:Analog Devices 功能描述:?±15 kV ESD Protected, 3.3 V Single-Channel RS-232 Line Driver/Receiver |
| ADM3101EARQZ | 功能描述:IC TXRX RS-232 3.3V 15KV 16QSOP RoHS:是 类别:集成电路 (IC) >> 接口 - 驱动器，接收器，收发器 系列:- 标准包装:1 系列:- 类型:线路收发器 驱动器/接收器数:5/3 规程:RS232 电源电压:3 V ~ 5.5 V 安装类型:表面贴装 封装/外壳:28-SOIC（0.295"，7.50mm 宽） 供应商设备封装:28-SOIC 包装:Digi-Reel® 产品目录页面:918 (CN2011-ZH PDF) 其它名称:296-25096-6 |
| ADM3101EARQZ | 制造商:Analog Devices 功能描述:IC RS232 TXRX 460KBPS 5.5V QSOP-16 制造商:Analog Devices 功能描述:IC, RS232 TXRX, 460KBPS, 5.5V, QSOP-16 |
| ADM3101EARQZ1 | 制造商:AD 制造商全称:Analog Devices 功能描述:?±15 kV ESD Protected, 3.3 V Single-Channel RS-232 Line Driver/Receiver |
| ADM3101EARQZ-REEL | 功能描述:IC TXRX RS-232 3.3V 15KV 16QSOP RoHS:是 类别:集成电路 (IC) >> 接口 - 驱动器，接收器，收发器 系列:- 标准包装:121 系列:- 类型:收发器 驱动器/接收器数:1/1 规程:RS422，RS485 电源电压:3 V ~ 3.6 V 安装类型:表面贴装 封装/外壳:10-WFDFN 裸露焊盘 供应商设备封装:10-DFN（3x3） 包装:管件 |
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