AD8400
PRODUCTIONSingle-Channel Digital Potentiometer
- Part Models
- 8
- 1ku List Price
- Starting From $1.76
Part Details
- 256-Position
- Replaces 1,2 or 4 Potentiometers
- 1 kΩ, 10 kΩ, 50 kΩ, 100 kΩ
- Power Shutdown - Less than 5 µA
- 3-Wire SPI-Compatible Serial
- Data Input
- 10 MHz Update Data Loading Rate
- 2.7 V to 5.5 V Single-Supply Operation
- Midscale Preset
The AD8400 / AD8402 / AD8403 provide a single, dual or quad channel, 256 position digitally controlled variable resistor (VR) device. These devices perform the same electronic adjustment function as a potentiometer or variable resistor. The AD8400 contains a single variable resistor in the compact SO-8 package. The AD8402 contains two independent variable resistors in saving SO-14 surface mount package. The AD8403 contains four independent variable resistors in 24-lead PDIP, SOIC and TSSOP packages. Each part contains a fixed resistor with a wiper contact that taps the fixed resistor value at a point determined by a digital code loaded into the controlling serial input register. The resistance between the wiper and either endpoint of the fixed resistor varies linearly with respect to the digital code transferred into the VR latch. Each variable resistor offers a completely programmable value of resistance, between the A terminal and the wiper or the B terminal and the wiper. The fixed A to B terminal resistance of 1 kOhm, 10 kOhm, 50 kOhm or 100 kOhm has a ±1% channel-to-channel matching tolerance with a nominal temperature coefficient of 500 ppm/°C. A unique switching circuit minimizes the high glitch inherent in traditional switched resistor designs avoiding any make-before-break or break-before-make operation.
Each VR has its own VR latch that holds its programmed resistance value. These VR latches are updated from an SPI compatible serial-to-parallel shift register that is loaded from a standard 3-wire serial-input digital interface. Ten data bits make up the data word clocked into the serial input register. The data word is decoded where the first two bits determine the address of the VR latch to be loaded, the last eight bits are data. A serial data output pin at the opposite end of the serial register allows simple daisy-chaining in multiple VR applications without additional external decoding logic.
APPLICATIONS
- Mechanical potentiometer replacement
- Programmable filters, delays, time constants
- Volume control, panning
- Line impedance matching
- Power supply adjustment
Documentation
Data Sheet 1
User Guide 1
Application Note 5
Technical Articles 1
Frequently Asked Question 1
Product Selection Guide 1
Device Drivers 1
Webcast 2
ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal. View our quality and reliability program and certifications for more information.
| Part Model | Pin/Package Drawing | Documentation | CAD Symbols, Footprints, and 3D Models |
|---|---|---|---|
| AD8400ARZ1 | 8-Lead SOIC | ||
| AD8400ARZ1-REEL | 8-Lead SOIC | ||
| AD8400ARZ10 | 8-Lead SOIC | ||
| AD8400ARZ10-REEL | 8-Lead SOIC | ||
| AD8400ARZ100 | 8-Lead SOIC | ||
| AD8400ARZ100-REEL | 8-Lead SOIC | ||
| AD8400ARZ50 | 8-Lead SOIC | ||
| AD8400ARZ50-REEL | 8-Lead SOIC |
| Part Models | Product Lifecycle | PCN |
|---|---|---|
|
Jul 19, 2010 - 10_0179 AD8400, AD8402, AD8403 datasheet correction |
||
| AD8400ARZ1 | PRODUCTION | |
| AD8400ARZ1-REEL | PRODUCTION | |
| AD8400ARZ10 | PRODUCTION | |
| AD8400ARZ10-REEL | PRODUCTION | |
| AD8400ARZ100 | PRODUCTION | |
| AD8400ARZ100-REEL | PRODUCTION | |
| AD8400ARZ50 | PRODUCTION | |
| AD8400ARZ50-REEL | PRODUCTION | |
This is the most up-to-date revision of the Data Sheet.
Software Resources
Device Drivers 1
Evaluation Software 0
Can't find the software or driver you need?
Evaluation Kits
AD8403 Evaluation Board