Rainbow-electronics MAX5886 Manual do Utilizador descarregar pdf (Página 9)

MAX5886

3.3V, 12-Bit, 500Msps High Dynamic

Performance DAC with Differential LVDS Inputs

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ended output voltages. The differential voltage existing

between IOUTP and IOUTN can also be converted to a

single-ended voltage using a transformer or a differen-

tial amplifier configuration. If no transformer is used, the

output should have a 50Ω termination to the analog

ground and a 50Ω resistor between the outputs.

Although not recommended because of additional

noise pickup from the ground plane, for single-ended

operation IOUTP should be selected as the output, with

IOUTN connected to AGND. Note that a single-ended

output configuration has a higher 2nd-order harmonic

distortion at high output frequencies than a differential

output configuration.

1.2V

REFERENCE

CURRENT-STEERING

DAC

FUNCTION

SELECTION

BLOCK

AGND

SEL0DGND

REFIO

FSADJ

CLKN

CLKP

IOUTP

IOUTN

SEGMENT SHUFFLING/LATCH

DECODER

LVDS RECEIVER/INPUT LATCH

DIFFERENTIAL DIGITAL INPUTS B0 THROUGH B11

MAX5886

Figure 1. Simplified MAX5886 Block Diagram

SET

(kΩ)

FULL-SCALE CURRENT

OUT

(mA)

REFERENCE CURRENT

REF

(µA)

CALCULATED 1% EIA STD

OUTPUT VOLTAGE

IOUTP/N

* (mV

P-P

)

2 62.5 19.2 19.1 100

5 156.25 7.68 7.5 250

10 312.5 3.84 3.83 500

15 468.75 2.56 2.55 750

20 625 1.92 1.91 1000

Table 1. I

OUT

and R

SET

Selection Matrix Based on a Typical 1.200V Reference Voltage

*Terminated into a 50Ω load.

1 2 3 4 5 6 7 8 9 10 11 12 13 14 ... 17 18

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