5

LTC1278

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: Recommended operating conditions.

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 12: 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

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).

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

specified.

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

bipolar modes.

(Note 5)

Integral Nonlinearity vs

Output Code

CODE

0

–1.0

–0.5

0

0.5

1.0

512 1024 1536 2048

LT1278 G1

2560 3072 3584 4096

CODE

0

–1.0

–0.5

0

0.5

1.0

512 1024 1536 2048

LT1278 G2

2560 3072 3584 4096

Differential Nonlinearity vs

Output Code

INPUT FREQUENCY (Hz)

10k

0

3

5

7

10

100k

1M

2M

LT1278 G4

1

4

6

9

12

11

62

56

74

68

8

2

NYQUIST

FREQUENCY

ENOBs and S/(N

+ D) vs

Input Frequency