Overview
The ADM1385ARS-REEL7, 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, especially in battery-powered and portable devices. The ADM1385 is part of the ADM3202/ADM3222/ADM1385 family, which offers low power consumption and enhanced features such as shutdown facilities and ESD protection.
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 | 12 | mA | No load, RL = 3 kΩ to GND |
| Shutdown Supply Current | 0.01 | 0.5 | - | μA | SD = low, VOUT = 12 V |
| Logic Input Threshold Low, VINL | - | 0.8 | - | V | - |
| Logic Input Threshold High, VINH | - | 2.0 | - | V | - |
| CMOS Output Voltage Low, VOL | - | 0.4 | - | V | IOUT = 1.6 mA |
| 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 |
| Receiver Propagation Delay TPHL | 0.4 | 1 | - | μs | - |
| Receiver Output Enable Time | - | 200 ns | - | - | - |
| Receiver Output Disable Time | - | 200 ns | - | - | - |
| Transition Region Slew Rate | 5.5 | 10 | 30 | V/μs | - |
Key Features
- Operates from a single 3.3 V power supply.
- Low power consumption with a shutdown facility (ADM3222 and ADM1385).
- High-speed data transmission up to 460 kbps.
- ESD protection to IEC 1000-4-2 (801.2) on RS-232 pins (ADM3202 only): ±8 kV contact discharge, ±15 kV air gap discharge.
- CMOS technology for minimal power dissipation.
- Available in various packages including PDIP, SOIC_N, SOIC_W, SSOP, and TSSOP.
- Internally generated positive and negative supplies (+6 V and -6 V nominal) using a charge pump voltage converter.
- Full compliance with EIA-232E specifications.
Applications
- General-purpose RS-232 data links.
- Portable instruments.
- Printers.
- Palmtop computers and PDAs.
- Battery-powered devices due to low power consumption and shutdown facilities.
Q & A
- What is the operating voltage range of the ADM1385?
The ADM1385 operates within a voltage range of 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 ADM1385 supports a maximum data rate of 460 kbps. - What type of ESD protection does the ADM3202 offer?
The ADM3202 offers ESD protection to IEC 1000-4-2 (801.2) on RS-232 pins, with ±8 kV contact discharge and ±15 kV air gap discharge. - What are the typical power supply currents for the ADM1385?
The typical power supply current is 3 mA (no load) and 12 mA (RL = 3 kΩ to GND). - What is the shutdown supply current for the ADM1385?
The shutdown supply current is 0.01 μA to 0.5 μA when SD = low and VOUT = 12 V. - In what packages is the ADM1385 available?
The ADM1385 is available in PDIP, SOIC_N, SOIC_W, SSOP, and TSSOP packages. - What is the typical logic input threshold for the ADM1385?
The typical logic input threshold low (VINL) is 0.8 V, and the typical logic input threshold high (VINH) is 2.0 V. - What is the CMOS output voltage low for the ADM1385?
The CMOS output voltage low (VOL) is typically 0.4 V at IOUT = 1.6 mA. - What is the RS-232 output short-circuit current for the ADM1385?
The RS-232 output short-circuit current is ±15 mA. - What is the operating temperature range for the ADM1385?
The operating temperature range is -40°C to 85°C.
