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IOUTX

+

+

DGND

VDD

RFBX

AGNDX

Analog

Power

Supply

Load

15 V

2R

5 V

R

15 V

VEE

VCC

VOUT

A1

DGND

VREFX

R

R

R

2R

2R

2R

R

5 k

Ω

S2

S1

Digitalinterface onnectionsareomittedforclarity.

SwitchesS1andS2areclosed;V

mustbepowered.

DD

c

14

D0

D1

D2

D3

D4

D5

D6

D7

D8

D9

D10

D11

D12

D13

A0

A1

A

B

DAC

Decode

Input

Register

Input

Register

DACA

Register

DACB

Register

R

R

R

R

DACA

DACB

Set

MSB

Set

MSB

Power-On

Reset

DGND

MSB

LDAC

RS

V

DD

V

AB

REF

R A

FB

I

A

OUT

A

A

GND

A

B

GND

I

B

OUT

R B

FB

CS

CLK

SDI

EN

DAC8802

SBAS351B – AUGUST 2005 – REVISED FEBRUARY 2007

Figure 15 shows the gain vs frequency performance at various attenuation settings using a 3 pF external

feedback capacitor connected across the IOUTX and RFBX terminals. In order to maintain good analog

performance, power supply bypassing of 0.01 µF, in parallel with 1 µF, is recommended. Under these

conditions, a clean power supply with low ripple voltage capability should be used. Switching power supplies is

usually not suitable for this application due to the higher ripple voltage and PSS frequency-dependent

characteristics. It is best to derive the DAC8802 5-V supply from the system analog supply voltages (do not use

the digital 5-V supply); see Figure 31.

Figure 31. Recommended Kelvin-Sensed Hookup

Figure 32. System Level Digital Interfacing

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