LTC1279CSW datasheet(5/16 Pages) LINER

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LTC1279

Note 7: Integral nonlinearity is defined as the deviation of a code from a

straight line passing through the actual endpoints of the transfer curve. The

deviation is measured from the center of the quantization band.

Note 8: Bipolar offset is the offset voltage measured from – 1/2LSB when

the output code flickers between 0000 0000 0000 and 1111 1111 1111.

Note 9: Guaranteed by design, not subject to test.

Note 10: The AC test is for bipolar mode. The signal-to-noise plus

distortion ratio is about 1dB lower for unipolar mode, so the typical

S/(N + D) at 100kHz in unipolar mode is 71dB.

Note 11: Recommended operating conditions.

Note 12: AIN must not exceed VDD or fall below VSS by more than 50mV for

specified accuracy. Therefore the minimum supply voltage for the unipolar

mode is 4.95V. The minimum for the bipolar mode is 4.75V, – 2.45V.

Note 13: The falling CONVST edge starts a conversion. If CONVST returns

high at a bit decision point during the conversion it can create small errors.

For best performance ensure that CONVST returns high either within 120ns

after conversion start (i.e., before the first bit decision) or after BUSY rises

(i.e., after the last bit test). See mode 1a and 1b (Figures 12 and 13) timing

diagrams.

TI I G CHARACTERISTICS

The q indicates specifications which apply over the full operating

temperature range; all other limits and typicals TA = 25°C.

Note 1: Absolute maximum ratings are those values beyond which the life

of a device may be impaired.

Note 2: All voltage values are with respect to ground with DGND and

AGND wired together (unless otherwise noted).

Note 3: When the analog input voltage is taken below VSS (ground for

unipolar mode) or above VDD, it will be clamped by internal diodes. This

product can handle input currents greater than 80mA below VSS (ground

for unipolar mode) or above VDD without latch-up.

Note 4: When these pin voltages are taken below VSS (ground for unipolar

mode), they will be clamped by internal diodes. This product can handle

input currents greater than 60mA below VSS (ground for unipolar mode)

without latch-up. These pins are not clamped to VDD.

Note 5: AVDD = DVDD = VDD = 5V, (VSS = – 5V for bipolar mode), fSAMPLE =

600kHz, tr = tf = 5ns unless otherwise specified.

Note 6: Linearity, offset and full scale specifications apply for unipolar and

bipolar modes.

(Note 5)

TYPICAL PERFORMANCE CHARACTERISTICS

OUTPUT CODE

4096

1279 G02

1024

2048

3072

1.0

0.5

–0.5

–1.0

512

1536

2560

3584

fSAMPLE = 600kHz

OUTPUT CODE

4096

1279 G01

1024

2048

3072

1.0

0.5

–0.5

–1.0

512

1536

2560

3584

fSAMPLE = 600kHz

Integral Nonlinearity vs

Output Code

FREQUENCY (Hz)

10k

100k

1279 G03

fSAMPLE = 600kHz

NYQUIST

FREQUENCY

ENOBs and S/(N + D) vs

Input Frequency

Differential Nonlinearity vs

Output Code

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