Rainbow-electronics MAX1383 Manual do Utilizador descarregar pdf (Página 3)

MAX1377/MAX1379/MAX1383

Dual, 12-Bit, 1.25Msps Simultaneous-Sampling

ADCs with Serial Interface

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ELECTRICAL CHARACTERISTICS—MAX1377 (continued)

AVDD

= 2.7V to 3.6V, V

= 1.8V to AVDD, f

SCLK

= 20MHz (50% duty cycle), V

REF

= 2.048V, REFSEL = V

, S/D = DGND, C

REF

1µF; T

= T

MIN

to T

MAX

, unless otherwise noted. Typical values are at T

= +25°C.)

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

Track-and-Hold Acquisition Time t

ACQ

125 ns

Aperture Delay 2ns

Aperture-Delay Matching 2ns

Aperture Jitter (Note 5) 30 ps

External Clock Frequency f

SCLK

20 MHz

ANALOG INPUTS (AIN1A, AIN1B, AIN2A, AIN2B)

Input Range U/B = 0, V

AIN_A

- RGND 0 V

REF

Differential Input Range U/B = 1, V

AIN_A

- V

AIN_B

-V

REF

/2 +V

REF

/2 V

Absolute Voltage Range 0 AVDD V

DC Leakage Current ±1 µA

Input Impedance 34 kΩ

Input Capacitance At each analog input 16 pF

EXTERNAL REFERENCE (REFSEL = 1)

Absolute Input Voltage Range V

REF

1.0

AVDD

+ 0.05

Input Capacitance 50 pF

DC Leakage Current ±1 µA

Input Current Time averaged at maximum throughput rate 800 µA

INTERNAL REFERENCE (REFSEL = 0)

Reference Voltage Level 2.028 2.048 2.068 V

SOURCE

= 0 to 1mA 1

Load Regulation

SINK

= 0 to 50µA 1

mV/mA

Voltage Temperature Coefficient ±50.0 ppm/

DIGITAL INPUTS (SCLK, CNVST, U/B, S/D, SEL, REFSEL)

Input-Voltage Low V

0.3 x

Input-Voltage High V

0.7 x

Input Leakage Current I

±10 µA

DIGITAL OUTPUT (DOUT1, DOUT2)

Output Load Capacitance C

DOUT

For stated timing performance 30 pF

Output-Voltage Low V

SINK

= 5mA 0.4 V

Output-Voltage High V

SOURCE

= 1mA, V

≥ 2.7V

- 0.5V

Output Leakage Current I

High-impedance mode (Figure 9) ±0.2 µA

POWER REQUIREMENTS

Analog Supply Voltage AVDD 2.7 3.0 3.6 V

Digital Supply Voltage V

1.8 AVDD V

1 2 3 4 5 6 7 8 ... 21 22

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