EVRDA012M4-HD 데이터 시트보기 (PDF) - Unspecified

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EVRDA012M4-HD

12 Bit 1.3 GS/s 4:1 MUXDAC

Unspecified 

RDA012M4 DATASHEET

DS_0012PB1-2805

Theory of Operation

For best dynamic and static performance, the

DAC employs 6-bit segmentation. The 3.3V

NMOS compatible 12-bit digital data inputs are

latched by a master-slave flip-flop immediately

after the input buffer to reduce the data skew.

The four-channel data are combined together by

the 48:12 MUX and latched again. The 6 MSB

data bits are decoded into thermometer code by

a two-stage decoding block, and the 6 LSB data

bits are transported through the delay equalizer

block. The digital data are synchronized again

by a second master slave flip-flop to reduce the

switching glitch. The decoded 6 MSB data drive

63 identical current switches, and the 6 LSB

data drive 6 current switches. The output nodes

from the LSB current switches are connected to

the analog output through an R-2R ladder to

generate the binary output.

The DAC output full-scale voltage follows the

relationship VFS = 0.3xVREF. An internal

reference circuit with approximately -10dB

supply rejection is integrated on chip for

application convenience. The reference pin is

provided for monitoring and for bypass

purposes. To band-limit the noise on the

reference voltage, the reference pin should be

bypassed to the GNDA node with capacitance >

100pF. The VREF pin can also be used to

override the internal reference with an accurate,

temperature-compensated external voltage

reference.

The timing diagram is shown in figure 3. The

1.3GHz external clock (HCLKI) is divided by 2

and 4 resulting in the MUX internal selection

signals S0 and S1. A low-speed clock (LCLKO)

is provided to drive the external digital. The

four-channel data input are latched with an

internal clock that is synchronized with the

LCLKO. Controlled by S0 and S1, input data are

fed to the 1.3GS/s DAC in the order shown.

Figure 4 - Input Timing Diagram.

Rockwell Scientific reserves the right to make changes to its product specifications at any time without notice.

The information furnished herein is believed to be accurate; however, no responsibility is assumed for its use.

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