DS1267-010 Dual Digital Potentiometer Chip Overview

Device Specifications

• Operating Voltage: 4.5V to 5.5V
• Temperature Range: -40°C to +85°C
• Package Options:14-pin DIP (300-mil)16-pin SOIC (300-mil)20-pin TSSOP (173-mil)
• Resistance Value: 10 kΩ
• Number of Positions: 256 positions per potentiometer
• Interface: 3-wire serial port (RST, CLK, DQ)
• Operating Temperature Range: Industrial: -40°C to +85°C

Features

• Ultra-low Power Consumption: Quiet, pumpless design
• Two Digitally Controlled Potentiometers: Each with 256 positions
• Serial Port: For setting and reading both potentiometers
• Stacked Configuration: Connectable in series for increased total resistance
• Temperature Compensation: ±0.3 LSB relative linearity
• Cascade Operation: Multiple devices can be controlled over a single 3-wire bus

Pin Assignment

Operation

The DS1267-010 consists of two digitally controlled potentiometers, each with 256 resistive sections. The position of the wiper on the resistive array is set by an 8-bit value. Communication and control are achieved via a 3-wire serial port interface, which allows reading and writing of the wiper positions. The device can be configured in a stacked mode to double the total resistance and achieve 9-bit resolution.

Applications

• Variable Gain Amplifiers: As shown in Figure 7, the DS1267-010 can be used in an inverting variable gain amplifier configuration.
• Fixed Gain Attenuators: As shown in Figure 8, the device can be used to attenuate incoming signals in a fixed gain attenuator setup.

Electrical Characteristics

• Supply Current (ICC): 22 µA to 650 µA
• Wiper Resistance (RW): 400 Ω to 1000 Ω
• Input Leakage (ILI): ±1 µA
• Output Leakage (ILO): ±1 µA
• Standby Current (ISTBY): 22 µA

Analog Resistor Characteristics

• End-to-End Resistor Tolerance: ±20%
• Absolute Linearity: ±0.75 LSB
• Relative Linearity: ±0.3 LSB
• Temperature Coefficient: 750 ppm/°C
• -3 dB Cutoff Frequency: 1 MHz

Timing Characteristics

• CLK Frequency (fCLK): Up to 10 MHz
• Data Setup Time (tDC): 30 ns
• Data Hold Time (tCDH): 10 ns
• Propagation Delay (tPLH, tPHL): 50 ns

Notes

• The DS1267-010 is designed for low-power applications requiring precise control of resistance values.
• The device supports both absolute and relative linearity specifications, ensuring accurate performance across its operating range.
• Multiple DS1267-010 devices can be cascaded to extend the control range while maintaining a single serial interface.