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LTC2473IDD Datasheet(PDF) 6 Page - Linear Technology |
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LTC2473IDD Datasheet(HTML) 6 Page - Linear Technology |
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6 / 20 page  LTC2471/LTC2473 6 24713f 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 compensa- tion pin (COMP). REFOUT must not 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. A0 (Pin 3): Chip Address Control Pin. The A0 pin can be tied to GND or VCC. If A0 is tied to GND, the LTC2471/ LTC2473 I2C address is 0010100. If A0 is tied to VCC, the LTC2471/LTC2473 I2C address is 1010100. GND (Pins 4, 7, 11, (Exposed Pad Pin 13 – DFN Package Only)): Ground. Connect exposed pad directly to the ground plane through a low impedance connection. SCL (Pin 5): Serial Clock Input of the I2C Interface. The LTC2471/LTC2473 can only act as an I2C slave and the SCL pin only accepts an external serial clock. Data is shifted into the SDA pin on the rising edges of SCL and output through the SDA pin on the falling edges of SCL. SDA (Pin 6): Bidirectional Serial Data Line of the I2C Inter- face. The conversion result is output through the SDA pin. The pin is high impedance unless the LTC2471/LTC2473 is in the data output mode. While the LTC2471/LTC2473 is in the data output mode, SDA is an open drain pull down (which requires an external 1.7k pull-up resistor to VCC). REF– (Pin 8): Negative Reference Input to the ADC. The voltage on this pin sets the zero input to the ADC. This pin should tie directly to ground or the ground sense of the input sensor. IN+ (LTC2473), IN (LTC2471) (Pin 9): Positive input volt- age for the LTC2473 differential device. ADC input for the LTC2471 single-ended device. IN– (LTC2473), GND (LTC2471) (Pin 10): Negative input voltage for the LTC2473 differential device. GND for the LTC2471 single-ended device. VCC (Pin 12): Positive Supply Voltage. Bypass to GND with a 10μF capacitor in parallel with a low-series-inductance 0.1μF capacitor located as close to pin 12 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 24713 G010 –120 –100 –80 –60 –40 –20 TA = 25°C TEMPERATURE (°C) –50 24713 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 24713 G12 1.250305 1.250310 1.250315 1.250320 1.250325 1.250330 1.250335 TA = 25°C |
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