LTC1402IGN datasheet(7/24 Pages) LINER

7 / 24 page

LTC1402

PIN FUNCTIONS

AVDD (Pin 1): 5V Analog Power Supply. Bypass to AGND1

and solid analog ground plane with 10

µF ceramic (or 10µF

tantalum in parallel with 0.1

µF ceramic).

AGND1 (Pin 2): Analog Ground. Tie to solid analog ground

plane. The analog ground plane should be solid and have

no cuts near the LTC1402.

AIN+ (Pin 3): Positive Analog Signal Input. 0V to 4.096V in

unipolar mode and

±2.048V in bipolar mode when AIN– is

grounded. Both of these ranges operate fully differentially

with respect to AIN–. (Note 3)

AIN– (Pin4):NegativeAnalogSignalInput.Canbegrounded

or driven differentially with AIN+. Identical to AIN+, except

that it inverts the input signal. (Note 3)

VREF (Pin 5): 4.096V Reference Voltage Output. Bypass to

AGND1 and solid analog ground plane with 10

µF ceramic

(or 10

µF tantalum in parallel with 0.1µF ceramic).

AGND2 (Pin 6): Analog Ground Return for the Reference

and Internal CDAC. AGND2 could be overdriven externally

above ground. Tie to solid analog ground plane.

Differential Nonlinearity

vs Output Code (Unipolar)

Integral Nonlinearity

vs Output Code (Unipolar)

Negative Power Supply Rejection

for VREF

Positive Power Supply Rejection

for VREF

CODE

0.50

4096

1402 G16

–0.50

–1.00

1024

2048

3072

512

1536

2560

3584

1.00

–0.25

0.25

–0.75

0.75

fSAMPLE = 2.2MHz

CODE

0.50

4096

1402 G17

–0.50

–1.00

1024

2048

3072

512

1536

2560

3584

1.00

–0.25

0.25

–0.75

0.75

fSAMPLE = 2.2MHz

VSS (V)

–5

4.065

4.070

4.075

4.080

4.085

4.090

4.095

– 4

–3

–2

–1

1402 G19

VDD (V)

4.5

4.065

4.070

4.075

4.080

4.085

4.090

4.095

4.75

5.0

5.25

5.5

5.75

1402 G21

6.0

Differential Nonlinearity

vs Output Code (Bipolar)

Integral Nonlinearity

vs Output Code (Bipolar)

CODE

0.50

4096

1402 G14

–0.50

–1.00

1024

2048

3072

512

1536

2560

3584

1.00

–0.25

0.25

–0.75

0.75

fSAMPLE = 2.2MHz

CODE

0.50

4096

1402 G15

–0.50

–1.00

1024

2048

3072

512

1536

2560

3584

1.00

–0.25

0.25

–0.75

0.75

fSAMPLE = 2.2MHz

TYPICAL PERFOR A CE CHARACTERISTICS (Bipolar Mode Plots Run with Dual ±5V Supplies.

Unipolar Mode Plots Run with a Single 5V Supply. VDD = 5V, VSS = – 5V for Bipolar, VDD = 5V, VSS = 0V for Unipolar), TA = 25°C.

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