Datasheet LTC1414 (Analog Devices) - 5

LTC1414
W U TYPICAL PERFOR A CE CHARACTERISTICS Spurious-Free Dynamic Range vs Differential Nonlinearity vs Input Frequency Intermodulation Distortion Plot Output Code
0 0 2.0 –10 fSAMPLE = 2.2MHz fIN1 = 80.566kHz –20 –20 fIN2 = 97.753kHz 1.0 –30 –40 –40 –50 –60 0 –60 DNL (LSBs) –70 AMPLITUDE (dB) –80 –1.0 –80 –100 SPURIOUS-FREE DYNAMIC RANGE (dB) –90 –100 –120 –2.0 10k 100k 1M 10M 0 200 400 600 800 1000 0 4096 8192 12288 16384 INPUT FREQUENCY (Hz) FREQUENCY (kHz) OUTPUT CODE 1414 G04 1414 F05a 1414 G06
Integral Nonlinearity vs Output Power Supply Feedthrough vs Input Common Mode Rejection vs Code Ripple Frequency Input Frequency
2.0 80 0 VSS (VRIPPLE = 0.02V) 70 V –20 DD (VRIPPLE = 0.2V) OGND (VRIPPLE = 0.5V) 1.0 60 OVDD (VRIPPLE = 0.5V) –40 50 0 40 –60 INL (LSBs) 30 –80 FEEDTHROUGH (dB) –1.0 20 AMPLITUDE OF POWER SUPPLY –100 COMMON MODE REJECTION (dB) 10 –2.0 –120 0 0 4096 8192 12288 16384 1k 10k 100k 1M 10M 0 2M 4M 6M 8M 10M OUTPUT CODE INPUT FREQUENCY (Hz) RIPPLE FREQUENCY (Hz) 1414 G07 LTC1414 • F12 1414 G08
U U U PIN FUNCTIONS A + IN (Pin 1):
Positive Analog Input. ± 2.5V input range
OGND (Pin 14):
Digital Ground for the Output Drivers. Tie when A – – IN is grounded. ±2.5V differential if AIN is driven to AGND differentially with A + IN .
D5 to D0 (Pins 15 to 20):
Data Outputs.
A – IN (Pin 2):
Negative Analog Input. Can be grounded or
OV
driven differentially with A +
DD (Pin 21):
Positive Supply for the Output Drivers. Tie IN . to Pin 28 when driving 5V logic. For 3V logic, tie to supply
VREF (Pin 3):
2.5V Reference Output. of the logic being driven.
REFCOMP (Pin 4):
4.06V Reference Bypass Pin.
DVDD (Pin 22):
5V Positive Supply. Tie to Pin 28. Bypass to AGND with 10µF ceramic or 10µF tantalum in
DGND (Pin 23):
Digital Ground. Tie to AGND. parallel with 0.1µF ceramic.
CONVST (Pin 24):
Conversion Start Signal. This active low
AGND (Pin 5):
Analog Ground. signal starts a conversion on its falling edge.
D13 to D6 (Pins 6 to 13):
Data Outputs. 5