MAX5189BEEI+ Datasheet MAX5189BEEI+ | P10-P12

MAX5186/MAX5189

Dual, 8-Bit, 40MHz, Current/Voltage,

Simultaneous-Output DACs

10 ______________________________________________________________________________________

SET

9.6kΩ

SET

COMP*

REFR

REF

REFO

MAX4040

AGND

DGND

1.2V

BANDGAP

REFERENCE

REN

CURRENT-

SOURCE ARRAY

*COMPENSATION CAPACITOR (C

COMP

= 100nF) **9.6kΩ REFERENCE CURRENT-SET RESISTOR

INTERNAL TO MAX5189 ONLY. USE EXTERNAL

SET

FOR MAX5186.

OPTIONAL EXTERNAL BUFFER

FOR HEAVIER LOADS

MAX5186

MAX5189

REF

SET

9.6kΩ

0.1µF10µF

SET

REFR

REFO

1.2V

BANDGAP

REFERENCE

REN

CURRENT-

SOURCE ARRAY

EXTERNAL

1.2V

REFERENCE

*9.6kΩ REFERENCE CURRENT-SET RESISTOR

INTERNAL TO MAX5189 ONLY. USE EXTERNAL

SET

FOR MAX5186.

MAX5186

MAX5189

MAX6520

AGND

DGND

Figure 2. Setting I

with the Internal 1.2V Reference and the Control Amplifier

Figure 3. MAX5186/MAX5189 with External Reference

MAX5186/MAX5189

Dual, 8-Bit, 40MHz, Current/Voltage,

Simultaneous-Output DACs

______________________________________________________________________________________ 11

Figure 4. Timing Diagram

X = Don’t care

Table 1. Power-Down Mode Selection

CLK

INPUT SAMPLE

N - 1

FOR DAC 1

DAC 1

N - 2

N + 1

N + 2

N - 2

N + 1

DS1

DS2

CLK

DAC 2

D0–D7

DAC 1 (N - 1)

DAC 2 (N) DAC 1 (N) DAC 2 (N + 1) DAC 1 (N + 1) DAC 2 (N + 2) DAC 1 (N + 2) DAC 2 (N + 3)

INPUT SAMPLE N

FOR DAC 2

UPDATES DAC 1

AND DAC 2 TO N

UPDATES DAC 1

AND DAC 2 TO N + 1

UPDATES DAC 1

AND DAC 2 TO N + 2

UPDATES DAC 1 AND

DAC 2 TO N - 1

PRELOADS SAMPLE N

FOR DAC 2

PRELOADS SAMPLE

N + 1 FOR DAC 2

PRELOADS SAMPLE

N + 2 FOR DAC 2

INPUT SAMPLE

N + 1

FOR DAC 2

INPUT SAMPLE

N + 2

FOR DAC 2

INPUT SAMPLE N

FOR DAC 1

INPUT SAMPLE

N + 1

FOR DAC 1

INPUT SAMPLE

N + 2

FOR DAC 1

DH1

DH2

N - 1

Digital Feedthrough

Digital feedthrough is the noise generated on a DAC’s

output when any digital input transitions. Proper board

layout and grounding will significantly reduce this

noise, but there will always be some feedthrough

caused by the DAC itself.

Total Harmonic Distortion

Total harmonic distortion (THD) is the ratio of the RMS

sum of the input signal’s N harmonics to the fundamen-

tal itself. This is expressed as:

where V

is the fundamental amplitude, and V

through

are the amplitudes of the 2nd- through Nth-order

harmonics.

Spurious-Free Dynamic Range (SFDR)

SFDR is the ratio of RMS amplitude of the carrier frequen-

cy (maximum signal component) to the RMS value of the

next largest noise or harmonic distortion component.

SFDR is usually measured in dBc with respect to the car-

rier frequency amplitude or in dBFS with respect to the

DAC’s full-scale range. Depending on its test condition,

SFDR is observed within a predefined window or to

Nyquist. In the case of the MAX5186/MAX5189, the SFDR

performance is measured for a 0dBFS output amplitude

and analyzed within the Nyquist window.

THD 20 log

(V V V V )

234 N

222 2

=×

++ +













... ...

AGND

High-Z

AGND

High-Z

MAX5189

MAX5186

ShutdownX1

Last state prior to standby modeWake-Up10

MAX5189

MAX5186

Standby00

OUTPUT STATE

POWER-DOWN

MODE

DACEN (DAC

ENABLE)

(POWER-DOWN SELECT)

MAX5186/MAX5189

Dual, 8-Bit, 40MHz, Current/Voltage,

Simultaneous-Output DACs

12 ______________________________________________________________________________________

REN AGNDDGND

**MAX5186 ONLY

OUT1P

CREF2

CREF1

CLK

OUT1N

OUT2P

OUT2N

0.1µF

0.1µF0.1µF

SET

*400Ω RESISTORS INTERNAL TO MAX5189 ONLY.

MAX5186

MAX5189

10µF

0.1µF

REFR

REFO

D0–D7

10µF

400Ω

-5V

402Ω

OUTPUT 1

MAX4108

400Ω*

400Ω

-5V

402Ω

OUTPUT 2

MAX4108

Figure 5. Differential to Single-Ended Conversion Using a Low-Distortion Amplifier

Differential to Single-Ended Conversion

The MAX4108 low-distortion, high-input bandwidth

amplifier may be used to generate a voltage from the

array current output of the MAX5186. The differential

voltage across OUT1P (or OUT2P) and OUT1N (or

OUT2N) is converted into a single-ended voltage by

designing an appropriate operational amplifier configu-

ration (Figure 5).

I/Q Reconstruction in a QAM Application

The MAX5186/MAX5189’s low distortion supports ana-

log reconstruction of in-phase (I) and quadrature (Q)

carrier components typically used in quadrature ampli-

tude modulation (QAM) architectures where I and Q

data are interleaved on a common data bus. A QAM

signal is both amplitude and phase modulated, created

by summing two independently modulated carriers of

identical frequency but different phase (90° phase dif-

ference).

In a typical QAM application (Figure 6), the modulation

occurs in the digital domain and the MAX5186/

MAX5189’s dual DACs may be used to reconstruct the

analog I and Q components.

The I/Q reconstruction system is completed by a quad-

rature modulator that combines the reconstructed I and

Q components with in-phase and quadrature carrier

frequencies and then sums both outputs to provide the

QAM signal.

P1-P3 P4-P6 P7-P9 P10-P12 P13-P14

MAX5189BEEI+

Mfr. #:

Buy MAX5189BEEI+

Manufacturer:

Maxim Integrated

Description:

Digital to Analog Converters - DAC 8-Bit 2Ch High Speed DAC

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MAX5189BEEI+