Rainbow-electronics MAX1081 Bedienungsanleitung PDF herunterladen (Seite 21)

MAX1080/MAX1081

300ksps/400ksps, Single-Supply, Low-Power,

8-Channel, Serial 10-Bit ADCs with Internal Reference

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Aperture Width

Aperture width (t

) is the time the T/H circuit requires

to disconnect the hold capacitor from the input circuit

(for instance, to turn off the sampling bridge and put

the T/H unit in hold mode).

Aperture Jitter

Aperture jitter (t

) is the sample-to-sample variation in

the time between the samples.

Aperture Delay

Aperture delay (t

) is the time defined between the

rising edge of the sampling clock and the instant when

an actual sample is taken.

Signal-to-Noise Ratio (SNR)

For a waveform perfectly reconstructed from digital

samples, the 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 only by quantization error and

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

SNR = (6.02

N + 1.76)dB

In reality, there are other noise sources besides quanti-

zation noise, including thermal noise, reference noise,

clock jitter, etc. Therefore, SNR is calculated by taking

the ratio of the RMS signal to the RMS noise, which

includes all spectral components minus the fundamen-

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

MAX1080

MAX1081

MC683XX

CH0

CH1

CH2

CH3

CH4

CH5

CH6

CH7

COM

SHDN

DD2

DD1

SCLK

DIN

SSTRB

DOUT

GND

REFADJ

REF

DD1

(POWER SUPPLIES)

SCK

PCS0

MOSI

MISO

0.1µF

10µF

(GND)

4.7µF

0.01µF

ANALOG

INPUTS

+5V

+3V

+5V

+3V

Figure 17. QSPI Connections

CLKX

CLKR

FSR

SCLK

DIN

DOUT

SSTRB

TMS320LC3x

MAX1080

MAX1081

Figure 18. MAX1080/MAX1081-to-TMS320 Serial Interface

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

MAX1080/MAX1081 1

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