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LTC1603CG Datasheet(PDF) 6 Page - Linear Technology |
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LTC1603CG Datasheet(HTML) 6 Page - Linear Technology |
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6 / 20 page  6 LTC1603 1603f PIN FUNCTIONS AIN+ (Pin 1): Positive Analog Input. The ADC converts the difference voltage between AIN+ and AIN– with a differen- tial range of ±2.5V. AIN+ has a ±2.5V input range when AIN– is grounded. AIN– (Pin 2): Negative Analog Input. Can be grounded, tied to a DC voltage or driven differentially with AIN+. VREF (Pin 3): 2.5V Reference Output. Bypass to AGND with 2.2 µF tantalum in parallel with 0.1µF ceramic. REFCOMP (Pin 4): 4.375V Reference Compensation Pin. Bypass to AGND with 47 µF tantalum in parallel with 0.1µF ceramic. AGND (Pins 5 to 8): Analog Grounds. Tie to analog ground plane. DVDD (Pin 9): 5V Digital Power Supply. Bypass to DGND with 10 µF tantalum in parallel with 0.1µF ceramic. DGND (Pin 10): Digital Ground for Internal Logic. Tie to analog ground plane. D15 to D0 (Pins 11 to 26): Three-State Data Outputs. D15 is the Most Significant Bit. BUSY (Pin 27): The BUSY output shows the converter status. It is low when a conversion is in progress. Data is valid on the rising edge of BUSY. OGND (Pin 28): Digital Ground for Output Drivers. OVDD (Pin 29): Digital Power Supply for Output Drivers. Bypass to OGND with 10 µF tantalum in parallel with 0.1µF ceramic. RD (Pin 30): Read Input. A logic low enables the output drivers when CS is low. CONVST (Pin 31): Conversion Start Signal. This active low signal starts a conversion on its falling edge when CS is low. CS (Pin 32): The Chip Select Input. Must be low for the ADC to recognize CONVST and RD inputs. SHDN (Pin 33): Power Shutdown. Drive this pin low with CS low for nap mode. Drive this pin low with CS high for sleep mode. VSS (Pin 34): – 5V Negative Supply. Bypass to AGND with 10 µF tantalum in parallel with 0.1µF ceramic. AVDD (Pin 35): 5V Analog Power Supply. Bypass to AGND with 10 µF tantalum in parallel with 0.1µF ceramic. AVDD (Pin 36): 5V Analog Power Supply. Bypass to AGND with 10 µF tantalum in parallel with 0.1µF ceramic and connect this pin to Pin 35 with a 10 Ω resistor. |
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