MAX1421(2001) 데이터 시트보기 (PDF) - Maxim Integrated

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MAX1421
(Rev.:2001)

12-Bit, 40Msps, +3.3V, Low-Power ADC with Internal Reference

Maxim Integrated 

12-Bit, 40Msps, +3.3V, Low-Power ADC

with Internal Reference

ELECTRICAL CHARACTERISTICS (continued)

(VAVDD = VDVDD = +3.3V, AGND = DGND = 0, VIN = ±1.024V, differential input voltage at -0.5dB FS, internal reference,

fCLK = 40MHz (50% duty cycle), digital output load CL ≈ 10pF, TA = TMIN to TMAX, unless otherwise noted. Typical values are at

TA = +25°C.)

PARAMETER

SYMBOL

CONDITIONS

MIN TYP MAX UNITS

Pipeline Delay (Latency)

Aperture Delay

Aperture Jitter

Data Output Delay

Bus Enable Time

Bus Disable Time

Figure 5

tAD

Figure 9

tAJ

Figure 9

tOD

Figure 5

tBE

Figure 4

tBD

Figure 4

7

fCLK

cycles

2

ns

2

ps

5

10

14

ns

5

ns

5

ns

Note 1: Internal reference, REFIN bypassed to AGND with a combination of 0.22µF in parallel with 1nF capacitor.

Note 2: External +2.048V reference applied to REFIN.

Note 3: Internal reference disabled. VREFIN = 0, VREFP = +2.162V, VCML = +1.65V, and VREFN = +1.138V.

Note 4: IMD is measured with respect to either of the fundamental tones.

Note 5: Specifies the common-mode range of the differential input signal supplied to the MAX1421.

Note 6: VDIFF = VREFP - VREFN

Note 7: Input bandwidth is measured at a 3dB level.

Note 8: VREFIN is internally biased to +2.048V through a 10kΩ resistor.

Note 9: Measured as the ratio of the change in mid-scale offset voltage for a ± 5% change in VAVDD using the internal reference.

Typical Operating Characteristics

(VAVDD = VDVDD = +3.3V, AGND = DGND = 0, VIN = ±1.024V, differential input voltage, fCLK = 40MHz (50% duty cycle), digital output

load CL = 10pF, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.)

FFT PLOT, 4096-POINT RECORD,

DIFFERENTIAL INPUT

0

fIN = 7.5439934MHz

AIN = -0.45dB FS

-20

FFT PLOT, 4096-POINT RECORD,

DIFFERENTIAL INPUT

0

fIN = 19.9047628MHz

AIN = -0.50dB FS

-20

FFT PLOT, 4096-POINT RECORD,

DIFFERENTIAL INPUT

0

fIN = 38.5440183MHz

AIN = -0.49dB FS

-20

-40

-40

-40

HD2

HD2

HD3

-60

HD2

HD3

-60

-60

HD3

-80

-80

-80

-100

-100

-100

-120

0

5

10

15

20

ANALOG INPUT FREQUENCY (MHz)

-120

0

5

10

15

20

ANALOG INPUT FREQUENCY (MHz)

-120

0

5

10

15

20

ANALOG INPUT FREQUENCY (MHz)

_______________________________________________________________________________________ 5

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