AD9704 datasheet(41/52 Pages) AD

Part #	AD9704

Description	8-/10-/12-/14-Bit, 175 MSPS TxDAC D/A Converters

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AD9704/AD9705/AD9706/AD9707

Rev. 0 | Page 41 of 52

DIFFERENTIAL BUFFERED OUTPUT

USING AN OP AMP

A dual op amp (see the circuit shown in Figure 92) can be used

in a differential version of the single-ended buffer shown in

Figure 91. The same R-C network is used to form a 1-pole

differential, low-pass filter to isolate the op amp inputs from the

high frequency images produced by the DAC outputs. The feed-

back resistors, RFB, determine the peak differential output

voltage by the formula

FS

FB

OUT

I

R

V

×

=

The maximum and minimum voltages out of the amplifier are

)

1

(

B

FB

REF

MAX

R

V

+

×

=

OUT

MAX

MIN

V

−

=

respectively. The common-mode voltage of the output is

determined by the formula

2

OUT

MAX

CM

V

−

=

AD9704/AD9705

AD9706/AD9707

IOUTA

IOUTB

RFB

ADA4841

VOUT

REFIO 23

21

RS

OTCM 19

CF

C

ADA4841

RFB

RB

CF

RS

RB

20

Figure 92. Single-Supply Differential Buffer

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