Rainbow-electronics MAX5886 Bedienungsanleitung PDF herunterladen (Seite 10)

MAX5886

3.3V, 12-Bit, 500Msps High Dynamic

Performance DAC with Differential LVDS Inputs

10 ______________________________________________________________________________________

Figure 3 displays a simplified diagram of the

MAX5886’s internal output structure.

Clock Inputs (CLKP, CLKN)

The MAX5886 features a flexible differential clock input

(CLKP, CLKN) operating from separate supplies

(VCLK, CLKGND) to achieve the lowest possible jitter

performance. The two clock inputs can be driven from

a single-ended or a differential clock source. For sin-

gle-ended operation, CLKP should be driven by a logic

source, while CLKN should be bypassed to AGND with

a 0.1µF capacitor.

The CLKP and CLKN pins are internally biased to 1.5V.

This allows the user to AC-couple clock sources directly

to the device without external resistors to define the DC

level. The input resistance of CLKP and CLKN is >5kΩ.

See Figure 4 for a convenient and quick way to apply a

differential signal created from a single-ended source

(e.g., HP 8662A signal generator) and a wideband

transformer. These inputs can also be driven from an

LVDS-compatible clock source; however, it is recom-

mended to use sinewave or AC-coupled ECL drive for

best performance.

Data Timing Relationship

Figure 5 shows the timing relationship between differ-

ential, digital LVDS data, clock, and output signals. The

MAX5886 features a 1.8ns hold, a -0.8ns setup, and a

1.8ns propagation delay time. There is a four-clock-

cycle latency between CLKP/CLKN transitioning

high/low and IOUTP/IOUTN.

LVDS-Compatible Digital Inputs

(B0P–B11P, B0N–B11N)

The MAX5886 features LVDS receivers on the bus input

interface. These LVDS inputs (B0P/N through B11P/N)

allow for a low-differential voltage swing with low con-

stant power consumption across a large range of

frequencies. Their differential characteristic supports

the transmission of high-speed data patterns without

the negative effects of electromagnetic interference

(EMI). All MAX5886 LVDS inputs feature on-chip termi-

nation with differential 100Ω resistors. See Figure 6 for

a simplified block diagram of the LVDS inputs.

0.1µF

1.2V

REFERENCE

10kΩ

REF

SET

DACREF

FSADJ

REFIO

REF

= V

REFIO

SET

CURRENT-STEERING

DAC

IOUTP

IOUTN

Figure 2. Reference Architecture, Internal Reference

Configuration

OUT

IOUTN IOUTP

CURRENT

SOURCES

CURRENT

SWITCHES

Figure 3. Simplified Analog Output Structure

SINGLE-ENDED

CLOCK SOURCE

(e.g., HP 8662A)

1:1

WIDEBAND RF TRANSFORMER

PERFORMS SINGLE-ENDED TO

DIFFERENTIAL CONVERSION.

DAC

CLKP

0.1µF

CLKN

CLKGND

25Ω

Figure 4. Differential Clock Signal Generation

1 2 ... 5 6 7 8 9 10 11 12 13 14 15 16 17 18

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