Overview
The ADM1385ARSZ-REEL, produced by Analog Devices Inc., is a high-speed, 2-channel RS-232/V.28 interface transceiver. This device operates from a single 3.3 V power supply, making it suitable for a variety of applications where low power consumption is crucial. The ADM1385 is designed to meet EIA-232E specifications and is an upgrade for older models such as the MAX3222/MAX3232 and LTC1385. It features a charge pump voltage converter, level-shifting transmitters, and receivers, enabling RS-232 levels to be developed from a single 3.3 V supply. This component is particularly useful in portable instruments, printers, and other battery-powered devices due to its low power consumption and high efficiency.
Key Specifications
| Parameter | Min | Typ | Max | Unit | Test Conditions/Comments |
|---|---|---|---|---|---|
| Operating Voltage Range | 3.0 | 3.3 | 5.5 | V | VCC |
| Power Supply Current | 1.3 | 3 | 8-12 | mA | No load, RL = 3 kΩ to GND |
| Shutdown Supply Current | 0.01 | 0.5 | μA | SD = low | |
| Logic Input Threshold Low, VINL | 0.8 | V | TIN | ||
| Logic Input Threshold High, VINH | 2.0 | V | TIN | ||
| CMOS Output Voltage Low, VOL | 0.4 | V | IOUT = 1.6 mA | ||
| CMOS Output Voltage High, VOH | ±2 | V | VOUT | ||
| RS-232 Output Short-Circuit Current | ±15 | mA | |||
| Maximum Data Rate | 460 | kbps | VCC = 3.3 V, RL = 3 kΩ to 7 kΩ, CL = 50 pF to 1000 pF | ||
| Transmitter Propagation Delay | 0.3 | 1.2 | μs | RL = 3 kΩ, CL = 1000 pF |
Key Features
- Operates from a single 3.3 V power supply, meeting EIA-232E specifications.
- Low power consumption with shutdown mode available (ADM1385).
- High-speed data transmission up to 460 kbps.
- ESD protection to IEC 1000-4-2 (801.2) on RS-232 pins (ADM3202 only).
- Available in various package options: PDIP, SOIC_N, SOIC_W, SSOP, and TSSOP.
- CMOS technology for minimal power dissipation, ideal for battery-powered devices.
- Internal charge pump voltage converter and level-shifting transmitters and receivers.
- Plug-in compatible with older models like MAX3222/MAX3232 and LTC1385.
Applications
- General-purpose RS-232 data links.
- Portable instruments.
- Printers.
- Palmtop computers and PDAs.
- Battery-powered devices where low power consumption is critical.
Q & A
- What is the operating voltage range of the ADM1385?
The operating voltage range is 3.0 V to 5.5 V, with a typical voltage of 3.3 V.
- What is the maximum data rate supported by the ADM1385?
The maximum data rate is 460 kbps.
- Does the ADM1385 have ESD protection?
Yes, the ADM3202 version has ESD protection to IEC 1000-4-2 (801.2) on RS-232 pins.
- What are the available package options for the ADM1385?
The ADM1385 is available in PDIP, SOIC_N, SOIC_W, SSOP, and TSSOP packages.
- Is the ADM1385 suitable for battery-powered devices?
Yes, it is designed with CMOS technology to minimize power dissipation, making it ideal for battery-powered devices.
- What is the typical power supply current of the ADM1385?
The typical power supply current is 3 mA with no load, and 8-12 mA with RL = 3 kΩ to GND.
- Does the ADM1385 have a shutdown mode?
Yes, the ADM1385 has a low power shutdown mode available.
- What is the RS-232 output short-circuit current of the ADM1385?
The RS-232 output short-circuit current is ±15 mA.
- Is the ADM1385 compatible with older RS-232 transceivers?
Yes, it is plug-in compatible with older models like MAX3222/MAX3232 and LTC1385.
- What is the typical transmitter propagation delay of the ADM1385?
The typical transmitter propagation delay is 0.3 to 1.2 μs with RL = 3 kΩ and CL = 1000 pF.
