Datasheet LTC2381-16 (Analog Devices) - 8
| Manufacturer | Analog Devices |
| Description | 16-Bit, 250ksps, Low Power SAR ADC with Serial Interface |
| Pages / Page | 26 / 8 — PIN FUNCTIONS CHAIN (Pin 1):. RDL/SDI (Pin 12):. VDD (Pin 2):. SCK (Pin … |
| File Format / Size | PDF / 2.1 Mb |
| Document Language | English |
PIN FUNCTIONS CHAIN (Pin 1):. RDL/SDI (Pin 12):. VDD (Pin 2):. SCK (Pin 13):. GND (Pins 3, 6, 10 and 16):. SDO (Pin 14):
Model Line for this Datasheet
- LTC2381CDE-16#PBF LTC2381CDE-16#PBF LTC2381CDE-16#TRPBF LTC2381CDE-16#TRPBF LTC2381CMS-16#PBF LTC2381CMS-16#PBF LTC2381CMS-16#TRPBF LTC2381CMS-16#TRPBF LTC2381HMS-16#PBF LTC2381HMS-16#PBF LTC2381HMS-16#TRPBF LTC2381HMS-16#TRPBF LTC2381IDE-16#PBF LTC2381IDE-16#PBF LTC2381IDE-16#TRPBF LTC2381IDE-16#TRPBF LTC2381IMS-16#PBF LTC2381IMS-16#PBF LTC2381IMS-16#TRPBF LTC2381IMS-16#TRPBF
Text Version of Document
LTC2381-16
PIN FUNCTIONS CHAIN (Pin 1):
Chain Mode Selector Pin. When low, the
RDL/SDI (Pin 12):
When CHAIN is low, the part is in Nor- LTC2381-16 operates in Normal Mode and the RDL/SDI mal Mode and the pin is treated as a bus enabling input. input pin functions to enable or disable SDO. When high, When CHAIN is high, the part is in chain mode and the the LTC2381-16 operates in Chain Mode and the RDL/ pin is treated as a serial data input pin where data from SDI pin functions as SDI, the daisy chain serial data input. another ADC in the daisy chain is input.
VDD (Pin 2):
2.5V Digital Power Supply. The range of
SCK (Pin 13):
Serial Data Clock Input. When SDO is enabled, VDD is 2.375V to 2.625V. Bypass VDD to GND with a 10µF the conversion result or daisy chain data from another ADC ceramic capacitor. is shifted out on the rising edges of this clock MSB first.
GND (Pins 3, 6, 10 and 16):
Ground.
SDO (Pin 14):
Serial Data Output. The conversion result or
IN+, IN– (Pins 4, 5):
Positive and Negative Differential daisy chain data is output on this pin on each rising edge Analog Inputs. of SCK MSB first. The output data is in 2’s complement format.
REF (Pins 7, 8):
Reference Input. The range of REF is 2.4V to 2.6V. This pin is referred to the GND pin and should be
OVDD (Pin 15):
I/O Interface Digital Power. The range of decoupled closely to the pin with a 47µF ceramic capacitor OVDD is 1.71V to 5.25V. This supply is nominally set to (X5R, 0805 size). the same supply as the host interface (1.8V, 2.5V, 3.3V, or 5V). Bypass OVDD to GND with a 0.1µF capacitor.
CNV (Pin 9):
Convert Input. A rising edge on this input initiates a new conversion. When the conversion is done,
GND (Exposed Pad Pin 17 – DFN Package Only):
Ground. the part powers down as long as CNV is held high. When Exposed pad must be soldered directly to the ground plane. CNV is returned low, the part powers up in preparation for the next conversion.
BUSY (Pin 11):
BUSY indicator. Goes high at the start of a new conversion and returns low when the conversion has finished.
FUNCTIONAL BLOCK DIAGRAM
VDD = 2.5V REF = 2.5V OVDD = 1.8V to 5V LTC2381-16 CHAIN IN+ + SDO SPI RDL/SDI 16-BIT SAMPLING ADC PORT SCK IN– – CNV CONTROL LOGIC BUSY GND 238116 BD01 238116fa 8 For more information www.linear.com/LTC2381-16
PIN FUNCTIONS CHAIN (Pin 1):
Chain Mode Selector Pin. When low, the
RDL/SDI (Pin 12):
When CHAIN is low, the part is in Nor- LTC2381-16 operates in Normal Mode and the RDL/SDI mal Mode and the pin is treated as a bus enabling input. input pin functions to enable or disable SDO. When high, When CHAIN is high, the part is in chain mode and the the LTC2381-16 operates in Chain Mode and the RDL/ pin is treated as a serial data input pin where data from SDI pin functions as SDI, the daisy chain serial data input. another ADC in the daisy chain is input.
VDD (Pin 2):
2.5V Digital Power Supply. The range of
SCK (Pin 13):
Serial Data Clock Input. When SDO is enabled, VDD is 2.375V to 2.625V. Bypass VDD to GND with a 10µF the conversion result or daisy chain data from another ADC ceramic capacitor. is shifted out on the rising edges of this clock MSB first.
GND (Pins 3, 6, 10 and 16):
Ground.
SDO (Pin 14):
Serial Data Output. The conversion result or
IN+, IN– (Pins 4, 5):
Positive and Negative Differential daisy chain data is output on this pin on each rising edge Analog Inputs. of SCK MSB first. The output data is in 2’s complement format.
REF (Pins 7, 8):
Reference Input. The range of REF is 2.4V to 2.6V. This pin is referred to the GND pin and should be
OVDD (Pin 15):
I/O Interface Digital Power. The range of decoupled closely to the pin with a 47µF ceramic capacitor OVDD is 1.71V to 5.25V. This supply is nominally set to (X5R, 0805 size). the same supply as the host interface (1.8V, 2.5V, 3.3V, or 5V). Bypass OVDD to GND with a 0.1µF capacitor.
CNV (Pin 9):
Convert Input. A rising edge on this input initiates a new conversion. When the conversion is done,
GND (Exposed Pad Pin 17 – DFN Package Only):
Ground. the part powers down as long as CNV is held high. When Exposed pad must be soldered directly to the ground plane. CNV is returned low, the part powers up in preparation for the next conversion.
BUSY (Pin 11):
BUSY indicator. Goes high at the start of a new conversion and returns low when the conversion has finished.
FUNCTIONAL BLOCK DIAGRAM
VDD = 2.5V REF = 2.5V OVDD = 1.8V to 5V LTC2381-16 CHAIN IN+ + SDO SPI RDL/SDI 16-BIT SAMPLING ADC PORT SCK IN– – CNV CONTROL LOGIC BUSY GND 238116 BD01 238116fa 8 For more information www.linear.com/LTC2381-16
