LTC1068 Series Clock-Tunable Quad Second Order Filter Building Blocks
The LTC1068 product family consists of four monolithic clock-tunable filter building blocks. Each product contains four matched, low noise, high accuracy 2nd order switched-capacitor filter sections. An external clock tunes the center frequency of each section.
The products differ only in their clock-to-center frequency ratio (200:1, 100:1, 50:1, or 25:1). They are available in a 28-pin SSOP surface mount package and support operation with ±5V, single 5V, or single 3.3V power supplies.
| Number of Filter Sections | Four Identical 2nd Order Filter Sections |
|---|---|
| Center Frequency Error (Typ) | ±0.3% |
| Center Frequency Error (Max) | ±0.8% |
| Low Noise per Section | 50µVRMS to 90µVRMS |
| Low Power Supply Current | 4.5mA (Single 5V) |
| Package Type | 28-pin SSOP |
| Operating Temperature Range (LTC1068I) | -40°C to +85°C |
| Max Clock Frequency (Mode 1, Q≤2.0) | 5.6 MHz |
| DC Open-Loop Gain | 85 dB |
The standard model has a ratio of 100:1, while other variants include 200:1, 50:1, and 25:1.
Yes, the product supports operation with ±5V, single 5V, or single 3.3V power supplies.
Yes, designing filters with an LTC1068 product is fully supported by FilterCAD filter design software.