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LTC1411

1411f

TYPICAL PERFOR A CE CHARACTERISTICS

Acquisition Time

vs Source Resistance

4096 Points FFT Plot (1MHz)

FREQUENCY (kHz)

–40

–20

1000

1411 G15

–60

–80

250

500

750

1250

–100

–120

–140

SINAD = 75dB

SFDR = 81dB

fSAMPLE = 2.5MHz

fIN = 1MHz

SOURCE RESISTANCE (

Ω)

10000

1411 G16

0.1

0.01

100

1000

100000

100

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 22

µF 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 10

µF

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 10

µF tantalum capacitor in

parallel with a 0.1

µF ceramic.

PI FU CTIO S

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 10

µF 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 10

µF tantalum capacitor.

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