Datasheet LTC1420 (Analog Devices) - 6

LTC1420
W U TYPICAL PERFOR A CE CHARACTERISTICS IDD vs Clock Frequency ISS vs Clock Frequency
52 1.4 50 1.2 1.0 48 VREF = 4.096V 0.8 (mA) 46 (mA) I DD V I SS 0.6 REF = 2.048V 44 0.4 42 0.2 40 0 0 2 4 6 8 10 0 2 4 6 8 10 CLOCK FREQUENCY (MHz) CLOCK FREQUENCY (MHz) 1420 G10 1420 G11
CMRR vs Input Frequency LTC1420 Nonaveraged 4096 Point FFT
90 0 fSAMPLE = 10Msps 80 fIN = 5.048828125MHz –20 SFDR = 83.2dB 70 SINAD = 71dB VIN = 4VP-P 60 –40 ±5V SUPPLIES 50 –60 40 CMRR (dB) 30 AMPLITUDE (dB) –80 20 –100 10 0 –120 0.01 0.1 1 10 0 1 2 3 4 5 INPUT FREQUENCY (MHz) FREQUENCY (MHz) 1420 G12 1420 G13
U U U PIN FUNCTIONS + AIN (Pin 1):
Positive Analog Input.
GND (Pin 6):
DAC Reference Ground.
– AIN (Pin 2):
Negative Analog Input.
VDD (Pin 7):
Analog 5V Supply. Bypass to GND with a 1µF to 10
V
µF ceramic.
CM (Pin 3):
2.5V Reference Output.Optional input com- mon mode for single supply operation. Bypass to GND
GND (Pin 8):
Analog Power Ground. with a 1µF to 10µF ceramic.
D11 to D0 (Pins 9 to 20):
Data Outputs. The output format
SENSE (Pin 4):
Reference Programming Pin. Ground is two’s complement. selects VREF = 4.096V. Short to VREF for 2.048V. Connect
OGND (Pin 21):
Output Logic Ground. Tie to GND. SENSE to VDD to drive VREF with an external reference.
OV V DD (Pin 22):
Positive Supply for the Output Logic.
REF (Pin 5):
DAC Reference. Bypass to GND with a 1µF to Connect to Pin 23 for 5V logic. If not shorted to Pin 23, 10µF ceramic. bypass to GND with a 1µF ceramic. 1420fa 6