Datasheet LTC1415 (Analog Devices) - 6

LTC1415
W U TYPICAL PERFORMANCE CHARACTERISTICS Power Supply Feedthrough vs Input Common Mode Rejection Ripple Frequency vs Input Frequency
0 80 –10 70 –20 60 –30 –40 50 –50 40 –60 30 –70 VDD 20 –80 DGND COMMON MODE REJECTION (dB) –90 10 OVDD –100 0 AMPLITUDE OF POWER SUPPLY FEEDTHROUGH (dB) 1k 10k 100k 1M 2M 1k 10k 100k 1M 2M RIPPLE FREQUENCY (Hz) INPUT FREQUENCY (Hz) LTC1415 • TPC08 LTC1415 • TPC09
U U U PI FU CTIO S + A RD (Pin 22):
Read Input. This enables the output
IN (Pin 1):
Positive Analog Input, 0V to 4.096V. drivers when CS is low.
– AIN (Pin 2):
Negative Analog Input, 0V to 4.096V.
CONVST (Pin 23):
Conversion Start Signal. This active
VREF (Pin 3):
2.50V Reference Output. low signal starts a conversion on its falling edge.
REFCOMP (Pin 4):
Bypass to AGND with 10µF tantalum
CS (Pin 24):
The Chip Select input must be low for the in parallel with 0.1µF or 10µF ceramic. ADC to recognize CONVST and RD inputs.
AGND (Pin 5):
Analog Ground.
BUSY (Pin 25):
The BUSY output shows the converter
D11 to D4 (Pins 6 to 13):
Three-State Data Outputs. status. It is low when a conversion is in progress. Its
DGND (Pin 14):
Digital Ground. rising edge may be used to latch the output data.
D3 to D0 (Pins 15 to 18):
Three-State Data Outputs.
0VDD (Pin 26):
Digital output buffer supply. Short to Pin
OGND (Pin 19):
Digital Output Buffer Ground. 28 for 5V output. Tie to 3V for driving 3V logic.
NAP/SLP (Pin 20):
Power Shutdown Mode. High for
DVDD (Pin 27):
5V Positive Supply. Short to Pin 28. quick wake-up Nap mode.
AVDD (Pin 28):
5V Positive Supply. Bypass to AGND
SHDN (Pin 21):
Power Shutdown Input. A low logic with 10µF tantalum in parallel with 0.1µF or 10µF ceramic. level will invoke the Shutdown mode selected by the NAP/SLP pin. Tie high if unused. 6