NCD2400M Wide Capacitance Range, Non-volatile Digital Programmable Capacitor INTEGRATED CIRCUITS DIVISION Features Description DC to 150MHz frequency range The NCD2400M is a dedicated electronic calibrator for 512-state digital programmable capacitor oscillators, with reliable performance at 105C as Series or shunt configuration required by OCXO applications. = 12.5pF to 194pF (15.5:1 tuning ratio) in C shunt This product can be used in series or shunt discrete 355fF steps configuration to support a wide variety of tuning circuit C = 1.7pF to 194pF in discrete 376fF steps series topologies. 2 2-wire (I C Fast-mode compatible) serial interface Digitally controlled capacitance trimming information is EEPROM non-volatile memory 2 communicated via a 2-wire, I C Fast-mode compatible Wide power supply range (2.5V to 5.5V) interface. The preferred power-up default capacitance Operation ambient temperature to 105C value can be stored in the internal, re-programmable, 2 x 2 x 0.65 mm 6-pin DFN package non-volatile memory. Applications Ordering Information OCXOs Part Description Oscillators Tunable RF stages Standard product, Chip ID = 0x60, NCD2400MTR Filter tuning DFN-6 in Tape & Reel (3000/Reel) Capacitive sensor trimming Special order, Contact Factory for details, Measurement equipment NCD2400M1TR Chip ID = 0x61, DFN-6 in Tape & Reel (3000/Reel) Figure 1. NCD2400M Block Diagram V DD V+ NCD2400M V+ CP DIGITAL SDA INTERFACE C 0 V+ AND MEMORY SCL CN GND DS-NCD2400M-R01 www.ixysic.com 1NCD2400M INTEGRATED CIRCUITS DIVISION 1. Specifications 3 1.1 Package Pinout 3 1.2 Pin Descriptions 3 1.3 Absolute Maximum Ratings . 3 1.4 Recommended Operating Conditions . 3 1.5 ESD Rating . 3 1.6 General Conditions for Electrical Characteristics . 4 1.7 Capacitor Electrical Characteristics . 4 1.8 Digital Interface: Electrical Characteristics of SDA and SCL 5 1.9 Digital Interface: AC Characteristics 5 1.10 Power Supply 5 2. Performance Data . 6 3. Functional Description 11 3.1 Introduction 11 3.2 Capacitive Digital to Analog Converter (CDAC) . 12 3.3 Non-Volatile Memory Configuration 13 3.4 Device Address . 13 3.5 Operating Modes 13 3.5.1 Volatile Mode . 13 3.5.2 Non-Volatile Mode . 13 2 3.6 I C Serial Interface . 13 3.6.1 Write Commands 14 3.6.2 Write Volatile Register Operation 14 3.6.3 Write Non-Volatile Memory Operation 15 3.6.4 Read Operation 17 3.6.5 Set Non-Volatile Mode Operation 18 3.6.6 Electrical and Timing Considerations . 19 3.6.7 Application Diagrams . 19 3.7 Capacitor Interface Electrical and Biasing Considerations 19 4. Capacitance Determination and Programming Procedure . 20 5. Manufacturing Information . 21 5.1 Moisture Sensitivity 21 5.2 ESD Sensitivity . 21 5.3 Soldering Profile . 21 5.4 Board Wash 21 5.5 Mechanical Dimensions . 22 5.5.1 Package Dimensions . 22 5.5.2 Tape & Reel Specification 22 2 www.ixysic.com R01