AS1500_1 AMSCO
Document overview
- Manufacturer or author: Provided By digicamel.com
- PDF pages: 14
Technical content
1 General Description
programming rates up to 10MHz. The AS1500 is available in four different resistor values. industrial temperature range of –40º to +125º.
2 Key Features
3 Applications
as a replacement for mechanical potentiometers. Figure 1. Application Diagram
10 Bit
4 Pin Assignments
Figure 2. Pin Assignments (Top View) Table 1. Pin Description input register is loaded into the DAC register. CK 5 Serial Clock Input, Positive Edge Triggered. VCC 6 Positive power supply, specified for operation at both 3V and 5V.
6 VCC
5 Absolute Maximum Ratings
Table 2. Absolute Maximum Ratings State Surface Mount Devices”. packages is matte tin (100% Sn). ESD 1 kV HBM MIL-Std883E 3015.7methods.
6 Electrical Characteristics
VCC = 3V±10% or 5V±10%, VA = VCC, VB = 0V, –40ºC ≤ TA ≤ +125ºC unless otherwise noted. Table 3. Electrical Characteristics – 10k and 20k Versions
1 Max Units
3 VAB = VCC, Wiper = No Connect 500 ppm/ºC
4 RWB, VCC = 5V, VA = No Connect -1 ±1/4 +1 LSB
VCC = 3V±10% or 5V±10%, VA = VCC, VB = 0V, –40ºC ≤ TA ≤ +125ºC unless otherwise noted.
- Typicals represent average readings at 25ºC and VCC = 5V.
- Wiper is not connected. IAB = 350µA for the 10kΩ version and 175µA for the 20kΩ version.
- All Tempcos are guaranteed by design and not subject to production test.
- Terminal A is not connected. IW = 350µA for the 10kΩ version and 175µA for the 20kΩ version.
- Resistor terminals A, B, W have no limitations on polarity with respect to each other.
- All capacitances are guaranteed by design and not subject to production test. Resistor-terminal capacitance
- Worst-case supply current consumed when input logic level at 2.4V, standard characteristic of CMOS logic.
- PDISS is calculated from (IDD×VCC). CMOS logic level inputs result in minimum power dissipation.
- All dynamic characteristics are guaranteed by design and not subject to production test. All dynamic characteris-
Table 4. Electrical Characteristics – 50k and 100k Versions
VCC = 3V±10% or 5V±10%, VA = VCC, VB = 0V, –40ºC ≤ TA ≤ +125ºC unless otherwise noted.
- Typicals represent average readings at 25ºC and VCC = 5V.
- Wiper is not connected. IAB = 70µA for the 50kΩ version and 35µA for the 100kΩ version.
- All Tempcos are guaranteed by design and not subject to production test.
- Terminal A is not connected. IW = 70µA for the 50kΩ version and 35µA for the 100kΩ version.
- Resistor terminals A, B, W have no limitations on polarity with respect to each other.
- All capacitances are guaranteed by design and not subject to production test. Resistor-terminal capacitance
- Worst-case supply current consumed when input logic level at 2.4V, standard characteristic of CMOS logic.
- PDISS is calculated from (IDD×VCC). CMOS logic level inputs result in minimum power dissipation.
- All dynamic characteristics are guaranteed by design and not subject to production test. All dynamic characteris-
Table 5. Switching Characteristics
- Typicals represent average readings at 25ºC and VCC=5V.
- Guaranteed by design and not subject to production test. Resistor-terminal capacitance tests are measured with
2.5V bias on the measured terminal. The remaining resistor terminals are left open circuit.
- See timing diagram for location of measured values. All input control voltages are specified with tR = tF = 1ns
VCC=3V or 5V. To avoid false clocking, a minimum input logic slew rate of 1V/µs should be maintained.
7 Detailed Description
word for the resistor value. The first two bits A1 and A0 have to be low to program the resistor value (see Table 6). 3). A detailed block diagram is shown in Figure 4. Table 6. Serial data format (10 bits) Figure 3. Timing Diagram Figure 4. Detailed Timing Diagram
00 MSB Data LSB
the zero-scale condition the wiper resistance of 100Ω remains present. symmetrical. The relation between them is shown in Figure 5. Figure 5. RWA and RWB versa code Table 7. RDAC-Codes WB
word. In Table 8 the resistor values between the wiper and terminal B for AS1500 are given for specific codes Dx. Figure 6. Equivalent RDAC Circuit temperature coefficient is determined by the internal resistor ratio. Therefore the temperature drift is only 15ppm/°C. Table 8. RDAC-Codes WA
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Applications
The digital potentiometer can replace in many applications the analog trimming potentiometer. The digital potentiometer is not sensitive to vibrations and shocks. It has an extremely small form-factor and can be adjusted very fast (e.g. AS1500 has an update rate of 600kHz). Furthermore the temperature drift, resolution and noise are significant better and cannot be achieved with a mechanical trimming potentiometer. Due to the programmability the resistor settings can be stored in the system memory, so that after a power down the exact settings can be recalled easily. All analog signals must remain within 0 to VCC range. For standard potentiometer applications the wiper output can be used directly. In the case of a low impedance load, a buffer shall be used.
8 Package Drawings and Markings
Figure 7. 8-pin SOIC Package
- Lead coplanarity should be 0 to 0.10mm (.004”) max.
- Package surface finishing:
(2.1) Top: matte (charmilles #18-30). (2.2) All sides: matte (charmilles #18-30). (2.3) Bottom: smooth or matte (charmilles #18-30).
- All dimensions exclusive of mold flash, and end flash from the pack-
age body shall not exceed 0.24mm (0.10”) per side (D).
- Details of pin #1 identifier are optional but must be located within
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9 Ordering Information
Table 9. Model Resistor Delivery Form Package Description AS1500 10k Ω Tubes 8-pin SOIC 8-bit Digital Potentiometer AS1501 20k Ω Tubes 8-pin SOIC 8-bit Digital Potentiometer AS1502 50k Ω Tubes 8-pin SOIC 8-bit Digital Potentiometer AS1503 100k Ω Tubes 8-pin SOIC 8-bit Digital Potentiometer AS1500-T 10k Ω T&R 8-pin SOIC 8-bit Digital Potentiometer AS1501-T 20k Ω T&R 8-pin SOIC 8-bit Digital Potentiometer AS1502-T 50k Ω T&R 8-pin SOIC 8-bit Digital Potentiometer AS1503-T 100k Ω T&R 8-pin SOIC 8-bit Digital Potentiometer
www.austriamicrosystems.com Revision 1.01 14 - 14 AS1500 Data Sheet - Ordering Information Copyrights Copyright © 1997-2008, austriamicrosystems AG, Schloss Premstaetten, 8141 Unterpremstaetten, Austria-Europe. Trademarks Registered ®. All rights reserved. The material herein may not be reproduced, adapted, merged, translated, stored, or used without the prior written consent of the copyright owner. All products and companies mentioned are trademarks or registered trademarks of their respective companies. Disclaimer Devices sold by austriamicrosystems AG are covered by the warranty and patent indemnification provisions appearing in its Term of Sale. austriamicrosystems AG makes no warranty, express, statutory, implied, or by description regarding the information set forth herein or regarding the freedom of the described devices from patent infringement. austriamicrosystems AG reserves the right to change specifications and prices at any time and without notice. Therefore, prior to designing this product into a system, it is necessary to check with austriamicrosystems AG for current information. This product is intended for use in normal commercial applications. Applications requiring extended temperature range, unusual environmental requirements, or high reliability applications, such as military, medical life-support or life-sustaining equipment are specifically not recommended without additional processing by austriamicrosystems AG for each application. For shipments of less than 100 parts the manufacturing flow might show deviations from the standard production flow, such as test flow or test location. The information furnished here by austriamicrosystems AG is believed to be correct and accurate. However, austriamicrosystems AG shall not be liable to recipient or any third party for any damages, including but not limited to personal injury, property damage, loss of profits, loss of use, interruption of business or indirect, special, incidental or consequential damages, of any kind, in connection with or arising out of the furnishing, performance or use of the technical data herein. No obligation or liability to recipient or any third party shall arise or flow out of austriamicrosystems AG rendering of technical or other services. Contact Information Headquarters austriamicrosystems AG A-8141 Schloss Premstaetten, Austria Tel: +43 (0) 3136 500 0 Fax: +43 (0) 3136 525 01 For Sales Offices, Distributors and Representatives, please visit: http://www.austriamicrosystems.com/contact-us