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AD7992 bảng dữ liệu(PDF) 6 Page - Analog Devices |
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AD7992 bảng dữ liệu(HTML) 6 Page - Analog Devices |
6 / 21 page AD7992 –6– REV. PrH PRELIMINARYTECHNICAL DATA PIN FUNCTION DESCRIPTION Pin Mnemonic Function AGND Analog Ground. Ground reference point for all circuitry on the AD7992. All analog input signals should be referred to this GND voltage. V DD Power Supply Input. The VDD range for the AD7992 is from +2.7V to +5.5V. VIN2/REFIN Analog Input 2 / Voltage Reference Input. In single-channel mode, this pin becomes the reference voltage input, and an external reference should be applied at this pin. The external reference input range is 1.2V to VDD. A 1 µF capacitor should be tied between this pin and AGND. If bit D6 is set to 1 in the Configuration Register the AD7992 will operate in single channel mode. In dual Channel mode, D6 in configuration register is 0, this pin provides the second analog input channel. The reference voltage for the AD7992 is taken from the power supply voltage in dual channel mode. VIN1 Analog Input 1. Single-ended analog input channel. The input range is 0V to REFIN. A S Logic Input. Address Select input which selects one of three I 2C addresses for the AD7992 as shown in Table I. CONVST Logic Input Signal. Convert Start Signal. This is an edge triggered logic input. The rising edge of this signal powers up the part. The power up time for the part is 1 µs. The falling edge of CONVST places the track/hold into hold mode and initiates a conversion. A power up time of at least 1 µs must be allowed for the CONVST high pulse, otherwise the conver- sion result will be invalid. (See Modes of Operation Section) ALERT/BUSY Digital Output, selectable as an ALERT or BUSY output function. When configured as an ALERT output, this pin acts as an Out of Range Indicator, and if enabled it becomes active when the conversion result violates the DATAHIGH or DATALOW values. See Limit Registers section. When configured as a BUSY output, this pin becomes active when a conversion is in progress. Open-Drain Output. External pull-up resister required. S D A Digital I/O. Serial Bus Bi-directional Data. Open-drain output. External pull-up resistor required. S C L Digital Input. Serial Bus Clock. Open Drain. External pull-up resistor required. AD7992 PIN CONFIGURATION MSOP Table I. I 2C Address Selection Part Number AS Pin I 2C Address AD7992-0 G N D 010 0001 AD7992-0 V DD 010 0010 AD7992-1 G N D 010 0011 AD7992-1 V DD 010 0100 AD7992-X 1 Float 010 0000 Note:- 1. If the AS pin is left floating on any of the AD7992 parts the device address will be 010 0000. This will give each AD7992 device three differ- ent address options. AD7992 TOP VIEW 1 2 3 4 7 8 9 10 CONVST SDA SCL VDD AGND VIN1 (Not to Scale) ALERT 6 5 AGND VIN2 / REFIN AS |
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Mô tả tương tự - AD7992 |
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