LTC1411 查看數據表（PDF） - Linear Technology

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LTC1411

Single Supply 14-Bit 2.5Msps ADC

Linear Technology 

LTC1411

TYPICAL PERFOR A CE CHARACTERISTICS

4096 Points FFT Plot (1MHz)

0

SINAD = 75dB

–20

SFDR = 81dB

fSAMPLE = 2.5MHz

fIN = 1MHz

–40

–60

–80

–100

–120

–140

0

250 500 750 1000 1250

FREQUENCY (kHz)

1411 G15

Acquisition Time

vs Source Resistance

100

10

1

0.1

0.01

1

10 100 1000 10000 100000

SOURCE RESISTANCE (Ω)

1411 G16

PI FU CTIO S

AIN+ (Pin 1): Positive Analog Input. The ADC converts the

difference voltage between AIN+ and AIN– with program-

mable input ranges of ±1.8V, ±1.27V, ±0.9V and ±0.64V

depending on PGA selection. AIN+ has common mode

range between 0V and VDD.

AIN– (Pin 2): Negative Analog Input. This pin can be tied

to the REFOUT pin of the ADC or tied to an external DC

voltage. This voltage is also the bipolar zero for the ADC.

AIN– has common mode range between 0V and VDD.

REFOUT (Pin 3): 2.5V Reference Output. Bypass to AGND1

with a 22µF tantalum capacitor if REFOUT is tied to AIN–.

No capacitor is needed if the external reference is used to

drive AIN–.

REFIN (Pin 4): Reference Buffer Input. This pin can be

tied to REFOUT or to an external reference if more

precision is required.

REFCOM1 (Pin 5): Noise Reduction Pin. Put a 10µF

bypass capacitor at this pin to reduce the noise going into

the reference buffer.

REFCOM2 (Pin 6): 4.05V Reference Compensation Pin.

Bypass to AGND1 with a 10µF tantalum capacitor in

parallel with a 0.1µF ceramic.

AGND (Pins 7 to 9): Analog Ground. AGND1 is the ground

for the reference. AGND2 is the ground for the comparator

and AGND3 is the ground for the remaining analog

circuitry.

AVP (Pin 10): 5V Analog Power Supply. Bypass to AGND

with a 10µF tantalum capacitor.

AVM (Pin 11): Analog and Digital Substrate Pin. Tie this

pin to AGND.

D13 to D0 (Pins 12 to 25): Digital Data Outputs. D13 is the

MSB (Most Significant Bit).

OTR (Pin 26): Out-of-the-Range Pin. This pin can be used

in conjunction with D13 to determine if a signal is less than

or greater than the analog input range. If D13 is low and

OTR is high, the analog input to the ADC exceeds the

maximum voltage of the input range.

BUSY (Pin 27): Busy Output. Converter status pin. It is

low during conversion.

OGND (Pin 28): Digital Ground for Output Drivers (Data

Bits, OTR and BUSY).

OVDD (Pin 29): 3V or 5V Digital Power Supply for Output

Drivers (Data Bits, OTR and BUSY). Bypass to OGND with

a 10µF tantalum capacitor.

1411f

6

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