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LTC2298CUP Datasheet(PDF) 11 Page - Linear Technology |
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LTC2298CUP Datasheet(HTML) 11 Page - Linear Technology |
11 / 28 page LTC2298/LTC2297/LTC2296 11 229876f PI FU CTIO S AINA+ (Pin 1): Channel A Positive Differential Analog Input. AINA– (Pin 2): Channel A Negative Differential Analog Input. REFHA (Pins 3, 4): Channel A High Reference. Short together and bypass to Pins 5, 6 with a 0.1µF ceramic chip capacitor as close to the pin as possible. Also bypass to Pins 5, 6 with an additional 2.2µF ceramic chip capacitor and to ground with a 1µF ceramic chip capacitor. REFLA (Pins 5, 6): Channel A Low Reference. Short together and bypass to Pins 3, 4 with a 0.1µF ceramic chip capacitor as close to the pin as possible. Also bypass to Pins 3, 4 with an additional 2.2µF ceramic chip capacitor and to ground with a 1µF ceramic chip capacitor. VDD (Pins 7, 10, 18, 63): Analog 3V Supply. Bypass to GND with 0.1µF ceramic chip capacitors. CLKA (Pin 8): Channel A Clock Input. The input sample starts on the positive edge. CLKB (Pin 9): Channel B Clock Input. The input sample starts on the positive edge. REFLB (Pins 11, 12): Channel B Low Reference. Short together and bypass to Pins 13, 14 with a 0.1µF ceramic chip capacitor as close to the pin as possible. Also bypass to Pins 13, 14 with an additional 2.2µF ceramic chip ca- pacitor and to ground with a 1µF ceramic chip capacitor. REFHB (Pins 13, 14): Channel B High Reference. Short together and bypass to Pins 11, 12 with a 0.1µF ceramic chip capacitor as close to the pin as possible. Also bypass to Pins 11, 12 with an additional 2.2µF ceramic chip ca- pacitor and to ground with a 1µF ceramic chip capacitor. AINB– (Pin 15): Channel B Negative Differential Analog Input. AINB+ (Pin 16): Channel B Positive Differential Analog Input. GND (Pins 17, 64): ADC Power Ground. SENSEB (Pin 19): Channel B Reference Programming Pin. Connecting SENSEB to VCMB selects the internal reference and a ±0.5V input range. VDD selects the internal reference and a ±1V input range. An external reference greater than 0.5V and less than 1V applied to SENSEB selects an input range of ±VSENSEB. ±1V is the largest valid input range. VCMB (Pin 20): Channel B 1.5V Output and Input Common Mode Bias. Bypass to ground with 2.2µF ceramic chip capacitor. Do not connect to VCMA. LTC2296: IOVDD vs Sample Rate, 5MHz Sine Wave Input, –1dB, OVDD = 1.8V LTC2296: IVDD vs Sample Rate, 5MHz Sine Wave Input, –1dB LTC2296: SFDR vs Input Level, fIN = 5MHz, 2V Range, 25Msps TYPICAL PERFOR A CE CHARACTERISTICS INPUT LEVEL (dBFS) –60 – 50 – 40 –20 –30 –10 0 2296 G13 120 110 100 90 80 70 60 50 40 30 20 dBFS dBc 90dBc SFDR REFERENCE LINE SAMPLE RATE (Msps) 2296 G14 70 60 50 40 30 0 10 20 515 25 30 35 2V RANGE 1V RANGE 0 10 20 515 25 30 35 SAMPLE RATE (Msps) 2296 G15 6 4 2 0 |
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