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LTC2470CDDPBF Datasheet(PDF) 6 Page - Linear Technology |
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LTC2470CDDPBF Datasheet(HTML) 6 Page - Linear Technology |
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6 / 20 page  LTC2470/LTC2472 6 24702f PIN FUNCTIONS REFOUT (Pin 1): Reference Output Pin. Nominally 1.25V, this voltage sets the full-scale input range of the ADC. For noise and reference stability connect to a 0.1μF capacitor tied to GND. This capacitor value must be less than or equal to the capacitor tied to the reference compensation pin (COMP). REFOUT cannot be overdriven by an external reference. COMP (Pin 2): Internal Reference Compensation Pin. For low noise and reference stability, tie a 0.1μF capacitor to GND. CS (Pin 3): Chip Select (Active LOW) Digital Input. A LOW on this pin enables the SDO output. A HIGH on this pin places the SDO output pin in a high impedance state and any inputs on SDI and SCK will be ignored. SDI (Pin 4): Serial Data Input Pin. This pin is used to pro- gram the sleep mode and the 250sps/1ksps output rate. SCK (Pin 5): Serial Clock Input. SCK synchronizes the serial data input/output. Once the conversion is complete, a new data bit is produced at the SDO pin following each SCK falling edge. Data is shifted into the SDI pin on each rising edge of SCK. SDO (Pin 6): Three-State Serial Data Output. SDO is used for serial data output during the DATA INPUT/OUTPUT state. This pin goes Hi-Z when CS is high. GND (Pins 7, 11, Exposed Pad Pin 13 – DFN Package): Ground. Connect directly to the ground plane through a low impedance connection. REF– (Pin 8): Negative Reference Input to the ADC. The voltage on this pin sets the zero input to the ADC. This pin should be tied directly to ground or the ground sense of the input sensor. IN+ (LTC2472), IN (LTC2470) (Pin 9): Positive input volt- age for the LTC2472 differential device. ADC input for the LTC2470 single-ended device. IN– (LTC2472), GND (LTC2470) (Pin 10): Negative input voltage for the LTC2472 differential device. GND for the LTC2470 single-ended device. VCC (Pin 12): Positive Supply Voltage. Bypass to GND with a 10μF capacitor in parallel with a low-series-induc- tance 0.1μF capacitor located as close to the device as possible. TYPICAL PERFORMANCE CHARACTERISTICS (T A = 25°C, unless otherwise noted) Power Supply Rejection vs Frequency Applied to VCC Conversion Time vs Temperature 10 100 1k 1 100k 1M 10k 10M FREQUENCY AT VCC (Hz) 0 24702 G010 –120 –100 –80 –60 –40 –20 TA = 25°C TEMPERATURE (°C) –50 24702 G11 4.4 4.0 4.1 4.2 4.3 3.9 3.8 –25 25 50 75 0 100 VCC = 2.7V VCC = 4.1V VCC = 5.5V VREF vs VCC 2.0 3.5 2.5 4.0 3.0 5.0 5.5 4.5 6.0 VCC (V) 1.250345 1.250340 24702 G12 1.250305 1.250310 1.250315 1.250320 1.250325 1.250330 1.250335 TA = 25°C |
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