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| 型号： | MAX14778ETP+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 2/15页 |
| 文件大小： | 0K |
| 描述： | IC MULTIPLEXER 4X1 20TQFN-EP |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program Low Voltage Analog Switches Overview |
| 标准包装： | 1 |
| 功能： | 多路复用器 |
| 电路： | 2 x 4:1 |
| 导通状态电阻： | 1.5 欧姆 |
| 电压电源： | 单电源 |
| 电压 - 电源，单路/双路(±)： | 3 V ~ 5.5 V |
| 电流 - 电源： | 4.27mA |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 20-WQFN 裸露焊盘 |
| 供应商设备封装： | 20-TQFN-EP（5x5） |
| 包装： | 标准包装 |
| 其它名称： | MAX14778ETP+TDKR |
MAX14778
Dual ±25V Above- and Below-the-Rails
4:1 Analog Multiplexer
10
Maxim Integrated
Truth Tables
Table 1. MUX A Channel Selection
Table 2. MUX B Channel Selection
X = Don’t care
Detailed Description
The MAX14778 dual 4:1 analog multiplexer integrates
bias circuitry to provide a Q25V analog voltage range
with a single 3.0 to 5.5V supply. This extended input
range allows multiplexing different communications
signals such as RS-232, RS-485, audio and USB 1.1 onto
the same connector.
Integrated Bias Generation
The MAX14778 contains a total of three charge pumps to
generate bias voltages for the internal switches: a 5V regu-
lated charge pump, a positive high-voltage (+35V) charge
pump, and a negative high-voltage (-27V) charge pump.
When VDD is above 4.7V (typ), the 5V regulated charge
pump is bypassed and VDD provides the input for the high-
voltage charge pumps, reducing overall supply current.
An external 100nF capacitor is required for each high-
voltage charge pump between VP/VN and GND.
Analog Signal Levels
The MAX14778 transmits signals of up to Q25V with a
single 3.0 to 5.5V supply due to integrated bias circuitry.
The device features 1.5 (max) on-resistance and 3mI
(typ) flatness for analog signals between -25V and +25V
(see the Typical Operating Characteristics). The current
flow through the multiplexers can be bidirectional, allow-
ing operation either as a multiplexer or demultiplexer.
Digital Interface
The MAX14778 has two digital select inputs for each
MUX: SA1 and SA0 control MUX A; SB1 and SB0 control
MUX B. Drive the digital select inputs high or low to select
which input (A_, B_) is connected to the common termi-
nal (ACOM, BCOM) for each MUX. See the Truth Tables
for more information.
Each MUX features an independent enable input (ENA
and ENB). Drive ENA or ENB low to disconnect all inputs
from the common terminal for that MUX, regardless of the
status of the select inputs or the other enable input.
Applications Information
Connector Sharing
The MAX14778 supports a Q25V analog signal range
independently for each input/output, allowing physical
connector sharing between interface types that have
differing signal ranges.
The multiprotocol connector-sharing application in the
Typical Operating Circuits shows an application with
RS-232, half-duplex RS-485, full-speed USB 1.1, and
audio signals sharing the same connector. The device
allows signals to pass over the entire signal range speci-
fied by each standard while safely isolating the unused
transceivers.
ENA
SA1
SA0
ACOM
CONNECTED TO
0
X
Open
1
0
A0
1
0
1
A1
1
0
A2
1
A3
ENB
SB1
SB0
BCOM
CONNECTED TO
0
X
Open
1
0
B0
1
0
1
B1
1
0
B2
1
B3
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX14778EVKIT# | 制造商:Maxim Integrated Products 功能描述:EVALUATION KIT - Boxed Product (Development Kits) |
| MAX14780EEPA+ | 功能描述:RS-422/RS-485 接口 IC PROFIBUS RS-485 Transceiver RoHS:否 制造商:Maxim Integrated 数据速率:1136 Kbps 工作电源电压:3 V to 5.5 V 电源电流:5.9 mA 工作温度范围:- 40 C to + 85 C 安装风格:SMD/SMT 封装 / 箱体:SOIC-28 封装:Tube |
| MAX14780EESA+ | 功能描述:RS-422/RS-485 接口 IC PROFIBUS RS-485 Transceiver RoHS:否 制造商:Maxim Integrated 数据速率:1136 Kbps 工作电源电压:3 V to 5.5 V 电源电流:5.9 mA 工作温度范围:- 40 C to + 85 C 安装风格:SMD/SMT 封装 / 箱体:SOIC-28 封装:Tube |
| MAX14780EESA+T | 功能描述:RS-422/RS-485 接口 IC PROFIBUS RS-485 Transceiver RoHS:否 制造商:Maxim Integrated 数据速率:1136 Kbps 工作电源电压:3 V to 5.5 V 电源电流:5.9 mA 工作温度范围:- 40 C to + 85 C 安装风格:SMD/SMT 封装 / 箱体:SOIC-28 封装:Tube |
| MAX14783EASA+ | 制造商:Maxim Integrated Products 功能描述:HALF DUPLEX, DUAL VOLTAGE (3V TO 5.5V), HIGH ESD HBM (+/-35K - Rail/Tube 制造商:Maxim Integrated Products 功能描述:IC TXRX RS485/422 ESD 8SO |
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