Datasheet LTC1605 (Analog Devices) - 7

LTC1605
TYPICAL PERFORMANCE CHARACTERISTICS Total Harmonic Distortion vs SINAD vs Input Frequency Input Frequency
90 –70 89 88 –80 87 86 –90 85 SINAD (dB) 84 83 –100 82 TOTAL HARMONIC DISTORTION (dB) 81 –110 1 10 100 1 10 100 INPUT FREQUENCY (kHz) INPUT FREQUENCY (kHz) 1605 • TPC08 1605 • TPC09
PIN FUNCTIONS VIN (Pin 1):
Analog Input. Connect through a 200Ω resis-
R/C (Pin 24):
Read/Convert Input. With CS low, a falling tor to the analog input. Full-scale input range is ±10V. edge on R/C puts the internal sample-and-hold into the
AGND1 (Pin 2):
Analog Ground. Tie to analog ground plane. hold state and starts a conversion. With CS low, a rising edge on R/C enables the output data bits.
REF (Pin 3):
2.5V Reference Output. Bypass with 2.2µF tan- talum capacitor. Can be driven with an external reference.
CS (Pin 25):
ChipSelect. Internally OR’d with R/C. With R/C low, a falling edge on CS will initiate a conversion. With
CAP (Pin 4):
Reference Buffer Output. Bypass with 2.2µF R/C high, a falling edge on CS will enable the output data. tantalum capacitor.
BUSY (Pin 26):
Output Shows Converter Status. It is low
AGND2 (Pin 5):
Analog Ground. Tie to analog ground plane. when a conversion is in progress. Data valid on the rising
D15 to D8 (Pins 6 to 13):
Three-State Data Outputs. Hi-Z edge of BUSY. CS or R/C must be high when BUSY rises state when CS is high or when R/C is low. or another conversion will start without time for signal acquisition.
DGND (Pin 14):
Digital Ground.
V D7 to D0 (Pins 15 to 22):
Three-State Data Outputs. Hi-Z
ANA (Pin 27):
5V Analog Supply. Bypass to ground with a 0.1µF ceramic and a 10µF tantalum capacitor. state when CS is high or when R/C is low.
V BYTE (Pin 23):
Byte Select. With BYTE low, data will be
DIG (Pin 28):
5V Digital Supply. Connect directly to Pin 27. output with Pin 6 (D15) being the MSB and Pin 22 (D0) being the LSB. With BYTE high the upper eight bits and the lower eight bits will be switched. The MSB is output on Pin 15 and bit 8 is output on Pin 22. Bit 7 is output on Pin 6 and the LSB is output on Pin 13. 1605fd For more information www.linear.com/LTC1605 7 Document Outline Features Applications Typical Application Description Absolute Maximum Ratings Order Information Pin Configuration Converter Characteristics Analog Input Dynamic Accuracy Internal Reference Characteristics Digital Inputs and Outputs Timing Characteristics Power Requirements Typical Performance Characteristics Pin Functions Test Circuit Functional Block Diagram Applications Information Package Description Revision History Package Description Related Parts