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APPLICATION INFORMATION

Detailed Description

Bandgap

Reference

1.2 V

Control Amp

Current

Source

Array

Output

Current

Switches

DAC

Latch

+

Drivers

Decoder

Input

Latches

LVDS

Input

Interface

Clock Distribution

SLEEP

EXTIO

BIASJ

D[13:0]A

D[13:0]B

CLK

CLKC

DGND(2x)

14

14

AGND(4x)

0.1 F

m

1 k

Ω

1:4

Clock

Input

R

T

200

Ω

3.3V

(AV

3.3V

(AV

3.3V

(AV

100

Ω

50

Ω

50

Ω

I

OUT

I

OUT

1:1

Output

R

LOAD

50

Ω

DAC5675-EP

DAC5675-EP

SGLS381A – OCTOBER 2006 – REVISED OCTOBER 2006

Figure 13 shows a simplified block diagram of the current steering DAC5675. The DAC5675 consists of a

segmented array of NPN-transistor current sources, capable of delivering a full-scale output current up to

20 mA. Differential current switches direct the current of each current source to either one of the complementary

output nodes IOUT1 or IOUT2. The complementary current output enables differential operation, canceling out

common-mode noise sources (digital feedthrough, on-chip, and PCB noise), dc offsets, and even-order

distortion components, and doubling signal output power.

20 mA down to 2 mA by using the appropriate bias resistor value.

Figure 13. Application Schematic

13

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