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LTC2495 Datasheet(PDF) 10 Page - Linear Technology |
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LTC2495 Datasheet(HTML) 10 Page - Linear Technology |
10 / 32 page LTC2495 10 2495f GND (Pins 1, 4, 6, 31, 32, 33, 34): Ground. Multiple ground pins internally connected for optimum ground cur- rent flow and VCC decoupling. Connect each one of these pins to a common ground plane through a low impedance connection. All seven pins must be connected to ground for proper operation. SCL (Pin 2): Serial Clock Pin of the I2C Interface. The LTC2495 can only act as a slave and the SCL pin only ac- cepts an external serial clock. Data is shifted into the SDA pin on the rising edges of the SCL clock and output through the SDA pin on the falling edges of the SCL clock. SDA (Pin 3): Bidirectional Serial Data Line of the I2C Inter- face. In the transmitter mode (Read), the conversion result is output through the SDA pin, while in the receiver mode (Write), the device channel select and configuration bits are input through the SDA pin. The pin is high impedance during the data input mode and is an open drain output (requires an appropriate pull-up device to VCC) during the data output mode. NC (Pin 5): No Connect. This pin can be left floating or tied to GND. COM (Pin 7): The Common Negative Input (IN–) for All Single-Ended Multiplexer Configurations. The voltage on CH0-CH15 and COM pins can have any value between GND – 0.3V to VCC + 0.3V. Within these limits, the two selected inputs (IN+ and IN– ) provide a bipolar input range VIN = (IN + – IN–) from –0.5 • VREF/Gain to 0.5 • VREF/Gain. Outside this input range, the converter produces unique over-range and under-range output codes. CH0 to CH15 (Pin 8-Pin 23): Analog Inputs. May be pro- grammed for single-ended or differential mode. MUXOUTP (Pin 24): Positive Multiplexer Output. Connect to the input of external buffer/amplifier or short directly to ADCINP. ADCINP (Pin 25): Positive ADC Input. Connect to the output of a buffer/amplifier driven by MUXOUTP or short directly to MUXOUTP. TYPICAL PERFORMANCE CHARACTERISTICS PSRR vs Frequency at VCC (2x Speed Mode) PSRR vs Frequency at VCC (2x Speed Mode) PIN FUNCTIONS PSRR vs Frequency at VCC (2x Speed Mode) FREQUENCY AT VCC (Hz) 1 0 –20 –40 –60 –80 –100 –120 –140 1k 100k 2495 G36 10 100 10k 1M VCC = 4.1V DC REF+ = 2.5V REF– = GND IN+ = GND IN– = GND FO = GND TA = 25°C FREQUENCY AT VCC (Hz) 0 –140 –120 –80 –60 –40 0 20 100 140 2495 G37 –100 –20 80 180 220 200 40 60 120 160 VCC = 4.1V DC ±1.4V REF+ = 2.5V REF– = GND IN+ = GND IN– = GND FO = GND TA = 25°C FREQUENCY AT VCC (Hz) 30600 –60 –40 0 30750 2495 G38 –80 –100 30650 30700 30800 –120 –140 –20 VCC = 4.1V DC ±0.7V REF+ = 2.5V REF– = GND IN+ = GND IN– = GND FO = GND TA = 25°C |
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