Rainbow-electronics MAX1081 Bedienungsanleitung PDF herunterladen (Seite 22)

Signal-to-Noise Plus Distortion (SINAD)

SINAD is the ratio of the fundamental input frequency’s

RMS amplitude to RMS equivalent of all other ADC out-

put signals:

SINAD (dB) = 20

log (Signal

RMS

/ Noise

RMS

)

Effective Number of Bits (ENOB)

ENOB indicates the global accuracy of an ADC at a

specific input frequency and sampling rate. An ideal

ADC’s error consists only of quantization noise. With an

input range equal to the ADC’s full-scale range, calcu-

late ENOB as follows:

ENOB = (SINAD - 1.76) / 6.02

Total Harmonic Distortion (THD)

THD is the ratio of the RMS sum of the input signal’s

first five harmonics to the fundamental itself. This is

expressed as:

where V

is the fundamental amplitude, and V

through

are the amplitudes of the 2nd- through 5th-order

harmonics.

Spurious-Free Dynamic Range (SFDR)

SFDR is the ratio of the RMS amplitude of the funda-

mental (maximum signal component) to the RMS value

of the next-largest distortion component.

THD 20 log

VVVVV

=×

++++













MAX1080/MAX1081

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

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

22 ______________________________________________________________________________________

SCLK

DIN

DOUT

SSTRB

SEL2START SEL1 SEL0 PD1 PD0

UNI/BIP SGI/DIF

B8 S1

MSB

HIGH IMPEDANCE

Figure 19. MAX1080/MAX1081-to-TMS320 Serial Interface

PART

TEMP.

RANGE

PIN-

PACKAGE

MAX1080BEUP

MAX1081AEUP

MAX1081BEUP -40°C to +85°C

-40°C to +85°C

-40°C to +85°C 20 TSSOP

20 TSSOP

±1

±1/2

INL

(LSB)

±1

MAX1081ACUP

MAX1081BCUP 0°C to +70°C

0°C to +70°C 20 TSSOP

20 TSSOP

±1/2

±1

Ordering Information (continued)

Typical Operating Circuit

I/O

SCK (SK)

MOSI (SO)

MISO (SI)

SHDN

SSTRB

DOUT

DIN

SCLK

COM

GND

DD1

DD2

CH7

4.7µF

0.1µF

CH0

0 TO

+2.5V

ANALOG

INPUTS

MAX1080

MAX1081

CPU

+5V OR

+3V

REF

0.01µF

REFADJ

DD2

Chip Information

TRANSISTOR COUNT: 4286

PROCESS: BiCMOS

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

MAX1080/MAX1081 1

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