Rainbow-electronics MAX1338 User Manual download pdf (Page 20)

MAX1338

Gain Error

Gain error indicates how well the slope of the actual

transfer function matches the slope of the ideal transfer

function. For the MAX1338, the gain error is the differ-

ence between the measured positive full-scale and

negative full-scale transition points minus the difference

between the ideal positive full-scale and negative full-

scale bipolar transition points.

Signal-to-Noise Ratio (SNR)

SNR is a measure of the converter’s noise characteris-

tics. For a waveform perfectly reconstructed from digi-

tal samples, SNR is the ratio of the full-scale analog

input (RMS value) to the RMS quantization error (resid-

ual error). The ideal, theoretical minimum analog-to-dig-

ital noise is caused by quantization noise error only and

results directly from the ADC’s resolution (N bits):

14-Bit, 4-Channel, Software-Programmable,

Multiranging, Simultaneous-Sampling ADC

20 ______________________________________________________________________________________

4 x V

REFADC

4 x V

REF

1 LSB =

TWO'S COMPLEMENT BINARY OUTPUT CODE

-8192 -8190 +8191+8189

0x2000

0x2001

0x2002

0x2003

0x1FFF

0x1FFE

0x1FFD

0x1FFC

0x3FFF

0x0000

0x0001

INPUT VOLTAGE (V

AIN_+

- V

AIN_-

IN LSBs)

-1 +1

Figure 9. ±5V Transfer Function

2 x V

REFADC

2 x V

REF

1 LSB =

TWO'S COMPLEMENT BINARY OUTPUT CODE

-8192 -8190 +8191+8189

0x2000

0x2001

0x2002

0x2003

0x1FFF

0x1FFE

0x1FFD

0x1FFC

0x3FFF

0x0000

0x0001

INPUT VOLTAGE (V

AIN_+

- V

AIN_-

IN LSBs)

-1 +1

Figure 10. ±2.5V Transfer Function

REFADC

REF

1 LSB =

TWO'S COMPLEMENT BINARY OUTPUT CODE

-8192 -8190 +8191+8189

0x2000

0x2001

0x2002

0x2003

0x1FFF

0x1FFE

0x1FFD

0x1FFC

0x3FFF

0x0000

0x0001

INPUT VOLTAGE (V

AIN_+

- V

AIN_-

IN LSBs)

-1 +1

Figure 11. ±1.25V Transfer Function

DIGITAL POWER SUPPLIES

AGND

DGND

+5V

DIGITAL

CIRCUITS

FERRITE

BEAD

+5V

GND

MAX1338

+5V

+3V

GND

AGND

ANALOG

POWER SUPPLY

DRV

DRGND

Figure 12. Power-Supply Grounding and Bypassing

1 2 ... 15 16 17 18 19 20 21 22 23 24

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Rainbow-electronics MAX1338 User Manual Page 20

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