Rainbow-electronics MAX1208 Instrukcja Użytkownika Pobierz pdf (Strona 13)

MAX1208

12-Bit, 80Msps, 3.3V ADC

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PIN NAME FUNCTION

28 D2 CMOS Digital Output, Bit 2

29 D1 CMOS Digital Output, Bit 1

30 D0 CMOS Digital Output, Bit 0 ( LSB)

31, 32 I.C.

Internally Connected. Leave I.C. unconnected.

33 DAV

Data-Valid Output. DAV is a single-ended version of the input clock that is compensated to correct for

any input clock duty-cycle variations. DAV is typically used to latch the MAX1208 output data into an

external back-end digital circuit.

37 PD Power-Down Input. Force PD high for power-down mode. Force PD low for normal operation.

38 REFOUT

Internal Reference Voltage Output. For internal reference operation, connect REFOUT directly to REFIN

or use a resistive divider from REFOUT to set the voltage at REFIN. Bypass REFOUT to GND with a

≥0.1µF capacitor.

39 REFIN

Reference Input. In internal reference mode and buffered external reference mode, bypass REFIN to

GND with a ≥0.1µF capacitor. In these modes, V

REFP

- V

REFN

= V

REFIN

/ 2. For unbuffered external

reference-mode operation, connect REFIN to GND.

40 G/T

Output Format Select Input. Connect G/T to GND for the two’s complement digital output format.

Connect G/T to OV

or V

for the Gray code digital output format.

—EP

Exposed Paddle. The MAX1208 relies on the exposed paddle connection for a low-inductance ground

connection. Connect EP to GND to achieve specified performance. Use multiple vias to connect the

top-side PC board ground plane to the bottom-side PC board ground plane.

Pin Description (continued)

MAX1208

−

DIGITAL ERROR CORRECTION

FLASH

ADC

T/H

DAC

STAGE 2

D11–D0

INP

INN

STAGE 1

T/H

STAGE 9

STAGE 10

END OF PIPE

OUTPUT

DRIVERS

D11–D0

Figure 1. Pipeline Architecture—Stage Blocks

1 2 ... 8 9 10 11 12 13 14 15 16 17 18 ... 26 27

12-Bit, 80Msps, 3.3V ADC 1

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