NOT RECOMMENDED FOR NEW DESIGNS RECOMMENDED REPLACEMENT PART ISL23425 DATASHEET ISL23348 FN7903 Rev 1.00 Quad, 128 Tap, Low Voltage Digitally Controlled Potentiometer (XDCP) August 24, 2011 The ISL23348 is a volatile, low voltage, low noise, low power, Features 128 tap, quad digitally controlled potentiometer (DCP) with an 2 Four potentiometers per package I C Bus interface. It integrates four DCP cores, wiper switches and control logic on a monolithic CMOS integrated 128 resistor taps circuit. 10k 50kor 100k total resistance 2 Each digitally controlled potentiometer is implemented with a I C serial interface combination of resistor elements and CMOS switches. The - No additional level translator for low bus supply position of the wipers are controlled by the user through the 2 - Three address pins allow up to eight devices per bus I C bus interface. Each potentiometer has an associated volatile Wiper Register (WRi, i = 0, 1, 2, 3) that can be directly Maximum supply current without serial bus activity written to and read by the user. The contents of the WRi (standby) controls the position of the wiper. When powered on, the wiper - 5A V and V = 5V CC LOGIC of each DCP will always commence at mid-scale (64 tap - 2A V and V = 1.7V CC LOGIC position). Shutdown mode The low voltage, low power consumption, and small package - Forces the DCP into an end-to-end open circuit and RWi is of the ISL23348 make it an ideal choice for use in battery connected to RLi internally operated equipment. In addition, the ISL23348 has a V LOGIC - Reduces power consumption by disconnecting the DCP pin allowing down to 1.2V bus operation, independent from the resistor from the circuit V value. This allows for low logic levels to be connected CC directly to the ISL23348 without passing through a voltage Power supply level shifter. -V = 1.7V to 5.5V analog power supply CC 2 The DCP can be used as a three-terminal potentiometer or as a -V = 1.2V to 5.5V I C bus/logic power supply LOGIC two-terminal variable resistor in a wide variety of applications Wiper resistance: 70 typical V = 3.3V including control, parameter adjustments, and signal processing. CC Power-on preset to mid-scale (64 tap position) Applications Extended industrial temperature range: -40C to +125C Power supply margining 20 Ld TSSOP or 20 QFN packages Trimming sensor circuits Pb-free (RoHS compliant) Gain adjustment in battery powered instruments RF power amplifier bias compensation 10000 VREF 8000 RH1 6000 - VREF M 1 DCP RW1 4000 OF + ISL23348 ISL28114 2000 RL1 0 032 64 96 128 TAP POSITION (DECIMAL) FIGURE 2. V ADJUSTMENT FIGURE 1. FORWARD AND BACKWARD RESISTANCE vs TAP REF POSITION, 10k DCP FN7903 Rev 1.00 Page 1 of 19 August 24, 2011 RESISTANCE ()ISL23348 Block Diagram V V LOGIC CC RH0 WR0 RW0 VOLATILE SCL REGISTER POWER UP SDA RL0 INTERFACE RH1 I/O LEVEL CONTROL A0 WR1 BLOCK SHIFTER AND RW1 VOLATILE A1 STATUS REGISTER LOGIC A2 RL1 RH2 WR2 RW2 VOLATILE REGISTER RL2 RH3 WR3 RW3 VOLATILE REGISTER RL3 GND Pin Configurations Pin Descriptions ISL23348 TSSOP QFN SYMBOL DESCRIPTION (20 LD TSSOP) 1 19 RL0 DCP0 low terminal TOP VIEW 220 RW0 DCP0 wiper terminal RL0 1 20 RL3 31 V Analog power supply. RW0 2 19 RW3 CC Range 1.7V to 5.5V V 3 18 RH3 CC 4 2 RH0 DCP0 high terminal RH0 4 17 RL2 RL1 5 16 RW2 5 3 RL1 DCP1 low terminal RW1 6 15 RH2 64 RW1 DCP1 wiper terminal RH1 7 14 SCL 7 5 RH1 DCP1 high terminal GND 8 13 SDA 8 6 GND Ground pin V 9 12 A2 LOGIC 2 A0 10 11 A1 97 V I C bus /logic supply. Range 1.2V to 5.5V LOGIC 10 8 A0 Logic Pin - Hardwire slave address pin for 2 I C serial bus. ISL23348 Range: V or GND LOGIC (20 LD QFN) 11 9 A1 Logic Pin - Hardwire slave address pin for TOP VIEW 2 I C serial bus. Range: V or GND LOGIC 12 10 A2 Logic Pin - Hardwire slave address pin for 20 19 18 17 2 I C serial bus. V 1 6 RH3 Range: V or GND 16 CC LOGIC 13 11 SDA Logic Pin - Serial bus data input/open 15 RL2 RH0 2 drain output RW2 3 14 RL1 14 12 SCL Logic Pin - Serial bus clock input RH2 4 13 RW1 15 13 RH2 DCP2 high terminal 12 SCL 5 RH1 16 14 RW2 DCP2 wiper terminal 11 SDA GND 6 17 15 RL2 DCP2 low terminal 18 16 RH3 DCP3 high terminal 78 9 10 19 17 RW3 DCP3 wiper terminal 20 18 RL3 DCP3 low terminal FN7903 Rev 1.00 Page 2 of 19 August 24, 2011 V RW0 LOGIC RL0 A0 A1 RL3 A2 RW3