MAX1300(2010) View Datasheet(PDF) - Maxim Integrated

Part Name

Description

Manufacturer

MAX1300
(Rev.:2010)

8- and 4-Channel, ±3 x VREF Multirange Inputs, Serial 16-Bit ADCs

Maxim Integrated 

8- and 4-Channel, ±3 x VREF Multirange Inputs,

Serial 16-Bit ADCs

Unipolar Offset Error

-FSR to 0V

When a zero-scale analog input voltage is applied to

the converter inputs, the digital output is all ones

(0xFFFF). Ideally, the transition from 0xFFFF to 0xFFFE

occurs at AGND1 - 0.5 LSB. Unipolar offset error is the

amount of deviation between the measured zero-scale

transition point and the ideal zero-scale transition point,

with all untested channels grounded.

0V to +FSR

When a zero-scale analog input voltage is applied to

the converter inputs, the digital output is all zeros

(0x0000). Ideally, the transition from 0x0000 to 0x0001

occurs at AGND1 + 0.5 LSB. Unipolar offset error is the

amount of deviation between the measured zero-scale

transition point and the ideal zero-scale transition point,

with all untested channels grounded.

Bipolar Offset Error

When a zero-scale analog input voltage is applied to the

converter inputs, the digital output is a one followed by

all zeros (0x8000). Ideally, the transition from 0x7FFF to

0x8000 occurs at (2N-1 - 0.5)LSB. Bipolar offset error is

the amount of deviation between the measured midscale

transition point and the ideal midscale transition point,

with untested channels grounded.

Gain Error

When a positive full-scale voltage is applied to the con-

verter inputs, the digital output is all ones (0xFFFF). The

transition from 0xFFFE to 0xFFFF occurs at 1.5 LSB

below full scale. Gain error is the amount of deviation

between the measured full-scale transition point and

the ideal full-scale transition point with the offset error

removed and all untested channels grounded.

Unipolar Endpoint Overlap

Unipolar endpoint overlap is the change in offset when

switching between complementary input voltage

ranges. For example, the difference between the volt-

age that results in a 0xFFFF output in the -3 x VREF/2 to

0V input voltage range and the voltage that results in a

0x0000 output in the 0 to +3 x VREF/2 input voltage

range is the unipolar endpoint overlap. The unipolar

endpoint overlap is positive for the MAX1300/MAX1301,

preventing loss of signal or a dead zone when switch-

ing between adjacent analog input voltage ranges.

Small-Signal Bandwidth

A 100mVP-P sine wave is applied to the ADC, and the

input frequency is then swept up to the point where the

amplitude of the digitized conversion result has

decreased by -3dB.

Full-Power Bandwidth

A 95% of full-scale sine wave is applied to the ADC,

and the input frequency is then swept up to the point

where the amplitude of the digitized conversion result

has decreased by -3dB.

Common-Mode Rejection Ratio (CMRR)

CMRR is the ability of a device to reject a signal that is

“common” to or applied to both input terminals. The

common-mode signal can be either an AC or a DC sig-

nal or a combination of the two. CMR is expressed in

decibels. Common-mode rejection ratio is the ratio of

the differential signal gain to the common-mode signal

gain. CMRR applies only to differential operation.

Power-Supply Rejection Ratio (PSRR)

PSRR is the ratio of the output-voltage shift to the

power-supply-voltage shift for a fixed input voltage. For

the MAX1300/MAX1301, AVDD1 can vary from 4.75V to

5.25V. PSRR is expressed in decibels and is calculated

using the following equation:

⎛

PSRR[dB] = 20 × log⎜

5.25V − 4.75V

⎞

⎟

⎝ VOUT(5.25V) − VOUT(4.75V)⎠

For the MAX1300/MAX1301, PSRR is tested in bipolar

operation with the analog inputs grounded.

Aperture Jitter

Aperture jitter, tAJ, is the statistical distribution of the

variation in the sampling instant (Figure 21).

Aperture Delay

Aperture delay, tAD, is the time from the falling edge of

SCLK to the sampling instant (Figure 21).

Signal-to-Noise Ratio (SNR)

SNR is computed by taking the ratio of the RMS signal

to the RMS noise. RMS noise includes all spectral com-

ponents to the Nyquist frequency excluding the funda-

mental, the first five harmonics, and the DC offset.

Signal-to-Noise Plus Distortion (SINAD)

SINAD is computed by taking the ratio of the RMS sig-

nal to the RMS noise plus distortion. RMS noise plus

distortion includes all spectral components to the

Nyquist frequency excluding the fundamental and the

DC offset.

SINAD(dB)

=

20 ×

⎛

log⎝⎜

SignalRMS

NoiseRMS

⎞

⎠⎟

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