Data Bus Circuit

A new approach to providing high-speed data outputs while minimizing performance limitations in ADC applications is the use of LVDS (low voltage differential signaling). ADI is incorporating LVDS output capability in a new 170 MSPS, 12-bit ADCthe AD9430and will include LVDS in some of its future high-speed ADCs and DACs (digital-to-analog converters)...

Standard for Electrical Characteristics of Backplane Transceiver Logic Interface Circuits validates BTL as the enabling technology for high speed busses. Driving backplanes with BTL means higher data rates and better noise margins than previously available...

Hand held computers are rapidly moving to 3V logic to save power. Yet higher voltage buses are still utilized elsewhere in the system for display driving and other functions. The LT1330 is functionally equivalent to the LT1237 but operates from 5V with a separate logic supply to interface directly with 3V logic...

This Application Note describes the two-endpoint case, using endpoints EP1 (TXFIFO-1) and EP3 (TXFIFO-2) for transmitting, and EP2 (RXFIFO-1) and EP4 (RXFIFO-2) for receiving data to/from the host. For simplicity, the packet data size is the same as the FIFO length (64 bytes each)...

The STE101P Transceiver is a high performance Fast Ethernet physical layer interface for 10Base-T and 100Base- TX applications designed for use with fiber optic cables (FX mode) over a continuous 125Mbps, 5B-encoded NRZI-format interface...

Because of the inherent characteristics of bipolar circuit techniques, which use differential pairs for logic state switching and an emitter follower for the output stage, the ECL (Emitter Coupled Logic) family has been widely used for high-speed signal interface (see Figure 1)...

The following description of how a receiver detects the transmission rate of an RS-232 interface does not describe the implementation of a receive-and-transmit routine. Instead, it describes a system consisting of a transmitter and a receiver. The transmitter (for example, a PC) transmits a character to the receiver. The receiver, a low-cost µC, detects the transmission rate and adjusts its software according to the new rate. The theory of implementation is simple...

PBUS is an RS485-like multi-drop bus for interconnecting PIC and other microcontroller-driven devices. Protocol and software is written by Jap. Just include a separate pbus library file into your project and add your command handlers for the specific device in a few lines...

The circuit in Figure 1 generates the required link-test pulses without RF emissions. The pulse must have a width of 60 to 130 nsec with a repetition frequency of 42 to 125 Hz. Pulse amplitude should be 500 mV to 3V. This test jig outputs pulses of about 1V, but you can easily change this level by changing the value of R2...

The circuit in Figure 1 provides a remote menu-selection switch matrix for PCs. It connects a linear, 8-bit switch to the RS-232C port; the RS-232C signal pins provide the circuit`s frugal power requirements. You can easily modify the circuit to read more switch inputs. The heart of the circuit is a 74HC165 8-bit, serial-output shift register...

The circuit in Figure 1 uses a MAX234 RS-232C driver, with the addition of a few capacitors and diodes, as a level translator. The circuit allows TTL-level signals to drive four power MOSFETs. The MAX234 is a line-driver chip that translates TTL-level signals to the RS-232C levels that serial communications require...

A circuit diagram shown above was used two small signal transistor, NPN and PNP transistors. Dash line separate transmitter and receiver circuit. For those who need only transmitter circuit can use above circuit (and GND (5) signal ). Technically the RS232C is -3V to -12V for logic `1` and +3V to +12V for logic `0`. The transmitter circuit uses PNP transistor, BC557. While in mark state the TxD signal is logic `1`, Q1 turns off. TxD (pin3) then provides -9V (depends on what converter chip being used for COM1, say) to RxD (pin2)...

The design in Fig 1 uses the Maxim MAX250 and MAX251 chip set and telecommunication-standard isolating components to provide a complete telecommunication-safety-standard isolated RS-232C interface. The MAX250 provides the TTL/CMOS logic interface and LED-driving capability. The device also provides a push-pull driver output to drive a power transformer. The MAX251 provides the rectifying circuit for the transformer`s output, as well as LED-to-RS-232C interfacing...

The circuit is a simple buffer which adds more driving capacity to PC serial port for the signal to go succesfully from PC computer to terminal server (other direction had no problems). The computer is connected to connector CON1 and the buffered output is available ar CON2. With this circuit the speed of RS232 connection to termial server could be succesfully raised for 9600 bps to 38400 bps...

A state-of-the-art silicon temperature sensor like MAX6577 measures a remote temperature far from the host system. The temperature sensor converts this temperature into a square wave with a frequency proportional to the absolute temperature of its package, while drawing little supply current from the power source. The amplitude of the output signal is equal to the power supply of the chip, and must be sent over a cable to the host system. The use of a RS-232 interface, low-power dedicated chip enables the communication, while providing power to the sensor...