The part number "ADM202EARNZ" refers to a RS-232 transceiver manufactured by Analog Devices. This part is designed for communication between devices using the RS-232 serial protocol, which is a common standard for data transmission between computers and peripheral devices.
Package Type:
The ADM202EARNZ is typically available in a 20-pin SOIC (Small Outline Integrated Circuit) package. This means it has 20 pins (also referred to as legs or leads) which are used to connect the IC to a circuit.
Pin Function Specifications and Circuit Principle:
Below is the detailed pinout of the ADM202EARNZ in a 20-pin SOIC package. Each pin has a specific function that facilitates the communication process, often used in serial communication applications.
Here is the complete list of the pin functions:
Pin Number Pin Name Function Description 1 T2OUT Transmit Data Output for the second transmitter (T2). 2 R2IN Receive Data Input for the second receiver (R2). 3 R2OUT Receive Data Output for the second transmitter (R2). 4 T2IN Transmit Data Input for the second transmitter (T2). 5 T1OUT Transmit Data Output for the first transmitter (T1). 6 R1IN Receive Data Input for the first receiver (R1). 7 R1OUT Receive Data Output for the first transmitter (R1). 8 T1IN Transmit Data Input for the first transmitter (T1). 9 VCC Supply voltage for the IC. Typically +5V. 10 GND Ground reference pin. 11 C1+ Positive terminal of the first charge pump capacitor . 12 C1- Negative terminal of the first charge pump capacitor. 13 C2+ Positive terminal of the second charge pump capacitor. 14 C2- Negative terminal of the second charge pump capacitor. 15 RI Ring Indicator. A signal used to detect a telephone ring. 16 DCD Data Carrier Detect. Indicates the presence of a carrier signal. 17 DSR Data Set Ready. Indicates if the device is ready for communication. 18 CTS Clear To Send. A flow control signal. 19 RTS Request To Send. A flow control signal. 20 NC No connection. This pin is not used and can be left floating.Circuit Principle:
The ADM202EARNZ works by transmitting and receiving serial data using RS-232 voltage levels. It uses a series of charge pumps to generate the required voltage levels (typically +12V and -12V) from a single supply voltage, usually +5V. It supports communication for both TTL (Transistor-Transistor Logic) and RS-232 signals, making it versatile for a variety of applications like connecting computers, modems, or industrial equipment.
FAQ (Frequently Asked Questions):
1. What is the supply voltage for ADM202EARNZ? The supply voltage for the ADM202EARNZ is typically +5V (VCC).
2. What is the package type of ADM202EARNZ? The ADM202EARNZ is available in a 20-pin SOIC package.
3. How many pins does the ADM202EARNZ have? The ADM202EARNZ has 20 pins.
4. Can I use ADM202EARNZ with TTL voltage levels? Yes, the ADM202EARNZ can interface with TTL voltage levels and RS-232 voltage levels.
5. What are the main features of the ADM202EARNZ? The main features include low power consumption, full-duplex communication, and multiple transmit and receive data channels.
6. How does the ADM202EARNZ handle voltage conversion? The ADM202EARNZ uses charge pump circuits to convert a +5V supply into the ±12V required for RS-232 communication.
7. What is the maximum data rate supported by the ADM202EARNZ? The maximum data rate supported is typically up to 250 kbps.
8. Can I use this IC for both half-duplex and full-duplex communication? Yes, the ADM202EARNZ supports full-duplex communication.
9. What is the purpose of the DCD pin? The DCD (Data Carrier Detect) pin is used to indicate the presence of a carrier signal in the communication channel.
10. What does the CTS pin represent? The CTS (Clear To Send) pin is used for flow control, indicating whether the receiving device is ready to accept data.
11. How can I use the RI pin? The RI (Ring Indicator) pin is used to detect an incoming call or ring signal, often in modem applications.
12. Is there a way to disable unused pins? Unused pins, such as NC (No Connection), can be left floating or grounded.
13. What is the purpose of the C1+ and C1- pins? These pins are for the charge pump capacitor to generate the required voltage for the RS-232 communication.
14. Does the ADM202EARNZ require external components? Yes, the ADM202EARNZ requires external capacitors for voltage regulation and charge pump operation.
15. What is the R1IN pin used for? The R1IN pin is the first receiver input used to receive serial data.
16. How does the ADM202EARNZ ensure data integrity? It ensures data integrity by providing voltage level conversion, and by using clear signals like CTS/RTS and DSR.
17. What does the RTS pin indicate? The RTS (Request To Send) pin is used for flow control, signaling that data is ready to be transmitted.
18. How can I connect the ADM202EARNZ to a computer? The ADM202EARNZ can be used to connect the computer's serial port to peripheral devices like modems or other RS-232 compatible equipment.
19. Is the ADM202EARNZ compatible with all RS-232 devices? Yes, it is compatible with most devices that use the RS-232 standard for serial communication.
20. What are the recommended operating conditions for the ADM202EARNZ? The recommended operating conditions include a +5V supply and standard RS-232 voltage levels.
Conclusion:
The ADM202EARNZ is a reliable and widely used RS-232 transceiver IC suitable for various applications requiring serial communication. It features a 20-pin SOIC package and offers flexible functionality, including voltage conversion, flow control, and dual transmitter/receiver support.
