Datasheet

ManualsBrandsMAXIM INTEGRATED ManualsData collecting ICsData acquisition IC - DA converter (DAC) QSOP 28

General Description

The MAX5182 is a dual, 10-bit, alternate-phase-update,

current-output digital-to-analog converter (DAC)

designed for superior performance in systems requiring

analog signal reconstruction with low distortion and

low-power operation. The MAX5185 provides equal

specifications with on-chip output resistors for voltage-

output operation. Both devices are designed for 10pV-s

glitch operation, to reduce distortion and minimize

unwanted spurious signal components at the output. An

on-board +1.2V bandgap circuit provides a well-regu-

lated, low-noise reference that can be disabled for

external reference operation.

The MAX5182/MAX5185 are designed to provide a high

level of signal integrity for the least amount of power dis-

sipation. Both DACs operate from a +2.7V to +3.3V sin-

gle supply. Additionally, these DACs have three modes

of operation: normal, low-power standby, and complete

shutdown. A full shutdown provides the lowest possible

power dissipation with a maximum shutdown current of

1µA. Fast wake-up time (0.5µs) from standby mode to

full DAC operation allows for power conservation by

activating the DACs only when required.

The MAX5182/MAX5185 are available in a 28-pin QSOP

package and are specified for the extended (-40°C to

+85°C) temperature range. For pin-compatible 8-bit

versions, refer to the MAX5188/MAX5191 data sheet.

Applications

Signal Reconstruction

Digital Signal Processing

Arbitrary Waveform Generators (AWGs)

Imaging Applications

Features

♦ +2.7V to +3.3V Single-Supply Operation

♦ Wide Spurious-Free Dynamic Range: 70dB at

OUT

= 2.2MHz

♦ Fully-Differential Outputs for Each DAC

♦ ±0.5% FSR Gain Mismatch Between DAC Outputs

♦ Low-Current Standby or Full-Shutdown Modes

♦ Internal +1.2V Low-Noise Bandgap Reference

♦ Small 28-Pin QSOP Package

MAX5182/MAX5185

Dual, 10-Bit, 40MHz Current/Voltage

Alternate-Phase Output DACs

________________________________________________________________ Maxim Integrated Products 1

CREF2

OUT2P

OUT2N

REFO

REFR

DGND

REN

N.C.

CLK

DACEN

AGND

OUT1N

OUT1P

CREF1

QSOP

TOP VIEW

MAX5182

MAX5185

19-1578; Rev 3; 12/01

PART

MAX5182BEEI

-40°C to +85°C

TEMP. RANGE PIN-PACKAGE

28 QSOP

Pin Configuration

Ordering Information

MAX5185BEEI

-40°C to +85°C 28 QSOP

For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at

1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.

Summary of content (14 pages)

PAGE 1
9-1578; Rev 3; 12/01 Dual, 10-Bit, 40MHz Current/Voltage Alternate-Phase Output DACs The MAX5182/MAX5185 are designed to provide a high level of signal integrity for the least amount of power dissipation. Both DACs operate from a +2.7V to +3.3V single supply. Additionally, these DACs have three modes of operation: normal, low-power standby, and complete shutdown. A full shutdown provides the lowest possible power dissipation with a maximum shutdown current of 1µA. Fast wake-up time (0.
PAGE 2
MAX5182/MAX5185 Dual, 10-Bit, 40MHz Current/Voltage Alternate-Phase Output DACs ABSOLUTE MAXIMUM RATINGS AVDD, DVDD to AGND, DGND .................................-0.3V to +6V Digital Inputs to DGND.............................................-0.3V to +6V OUT1P, OUT1N, OUT2P, OUT2N, CREF1, CREF2 to AGND ...................................................-0.3V to +6V VREF to AGND ..........................................................-0.3V to +6V AGND to DGND..............................................
PAGE 3
Dual, 10-Bit, 40MHz Current/Voltage Alternate-Phase Output DACs (AVDD = DVDD = +3V ±10%, AGND = DGND = 0, fCLK = 40MHz, IFS = 1mA, 400Ω differential output, CL = 5pF, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS 2.7 1.2 1.
PAGE 4
Typical Operating Characteristics (AVDD = DVDD = +3V, AGND = DGND = 0, 400Ω differential output, IFS = 1mA, CL = 5pF, TA = +25°C, unless otherwise noted.) DIFFERENTIAL NONLINEARITY vs. INPUT CODE 0.3 0.4 0.2 DNL (LSB) 0.2 0.1 0 0.1 -0.1 0 -0.1 -0.2 0 128 256 384 512 640 768 896 1024 2.50 MAX5182 2.25 128 256 384 512 640 768 896 1024 2.5 4.0 4.5 5.0 SUPPLY VOLTAGE (V) ANALOG SUPPLY CURRENT vs. TEMPERATURE DIGITAL SUPPLY CURRENT vs. SUPPLY VOLTAGE DIGITAL SUPPLY CURRENT vs.
PAGE 5
Dual, 10-Bit, 40MHz Current/Voltage Alternate-Phase Output DACs 1.26 MAX5182 1.25 MAX5185 MAX5182 1.26 1.25 MAX5185 1.24 1.24 2.5 3.0 3.5 4.0 4.5 5.0 -40 5.
PAGE 6
Typical Operating Characteristics (continued) (AVDD = DVDD = +3V, AGND = DGND = 0, 400Ω differential output, IFS = 1mA, CL = 5pF, TA = +25°C, unless otherwise noted.) SPURIOUS-FREE DYNAMIC RANGE vs. OUTPUT FREQUENCY AND CLOCK FREQUENCY, DAC2 78 78 fCLK = 20MHz 76 62.5 62.0 fCLK = 60MHz SFDR (dBc) 72 68 72 fCLK = 10MHz 70 fCLK = 50MHz fCLK = 10MHz SINAD (dB) 74 74 70 MAX5182/85-23 76 fCLK = 50MHz fCLK = 20MHz fCLK = 40MHz SIGNAL-TO-NOISE PLUS DISTORTION vs.
PAGE 7
Dual, 10-Bit, 40MHz Current/Voltage Alternate-Phase Output DACs PIN NAME FUNCTION 1 CREF1 Reference Bias Bypass, DAC1 2 OUT1P Positive Analog Output, DAC1. Current output for MAX5182; voltage output for MAX5185. 3 OUT1N Negative Analog Output, DAC1. Current output for MAX5182; voltage output for MAX5185. 4 AGND Analog Ground 5 AVDD Analog Positive Supply, +2.7V to +3.
PAGE 8
MAX5182/MAX5185 Dual, 10-Bit, 40MHz Current/Voltage Alternate-Phase Output DACs REN AVDD AGND CS DACEN PD 1.2V REF REFO CREF1 CURRENTSOURCE ARRAY REFR CREF2 OUT1P 9.6k* OUT1N DAC 1 SWITCHES OUT2P DAC 2 SWITCHES MSB DECODE MSB DECODE INPUT LATCHES INPUT LATCHES MAX5182 MAX5185 DVDD *INTERNAL 400Ω AND 9.6kΩ RESISTORS FOR MAX5185 ONLY. 400Ω * 400Ω * 400Ω * 400Ω * OUTPUT LATCHES OUTPUT LATCHES CLK OUT2N DGND D9–D0 Figure 1.
PAGE 9
Dual, 10-Bit, 40MHz Current/Voltage Alternate-Phase Output DACs MAX5182/MAX5185 OPTIONAL EXTERNAL BUFFER FOR HEAVIER LOADS DGND REN +1.2V BANDGAP REFERENCE MAX4040 REFO CCOMP* AGND REFR IREF = VREF CURRENTSOURCE ARRAY IREF RSET RSET IFS RSET ** 9.6k AGND MAX5182 MAX5185 *COMPENSATION CAPACITOR (COMP ≈ 100nF) **9.6kΩ REFERENCE CURRENT-SET RESISTOR INTERNAL TO MAX5185 ONLY. USE EXTERNAL RSET FOR MAX5182. Figure 2. Setting IFS with the Internal +1.
PAGE 10
MAX5182/MAX5185 Dual, 10-Bit, 40MHz Current/Voltage Alternate-Phase Output DACs tCLK tCL tCH CLK N-1 D0–D9 N-1 DAC1 DAC2 DAC1 tDS1 tDS1 N N DAC2 N-2 N-2 OUT2 N+1 DAC1 DAC2 tDH2 tDH1 OUT1 N+1 N-1 N-1 N N Figure 4. Timing Diagram Table 1.
PAGE 11
Dual, 10-Bit, 40MHz Current/Voltage Alternate-Phase Output DACs Applications Information Static and Dynamic Performance Definitions Integral Nonlinearity Integral nonlinearity (INL) (Figure 5a) is the deviation of the values on an actual transfer function from either a best-straight-line fit (closest approximation to the actual transfer curve) or a line drawn between the endpoints of the transfer function, once offset and gain errors have been nullified.
PAGE 12
MAX5182/MAX5185 Dual, 10-Bit, 40MHz Current/Voltage Alternate-Phase Output DACs Gain Error Gain error (Figure 5d) is the difference between the ideal and the actual full-scale output voltage on the transfer curve, after nullifying the offset error. This error alters the slope of the transfer function and corresponds to the same percentage error in each step.
PAGE 13
Dual, 10-Bit, 40MHz Current/Voltage Alternate-Phase Output DACs AVDD +3V 10µF AVDD 0.1µF 0.1µF 10µF MAX5182/MAX5185 +3V 0.1µF 0.1µF AVDD 402Ω DVDD CREF1 CREF2 +5V 402Ω OUT1P CLK OUTPUT1 400Ω* MAX4108 MAX5182 MAX5185 D0–D9 -5V OUT1N 402Ω 402Ω 400Ω* 402Ω REFO 402Ω 0.1µF +5V OUT2P OUTPUT2 400Ω* REFR MAX4108 -5V RSET** OUT2N 402Ω 402Ω 400Ω* DGND REN AGND *400Ω RESISTORS INTERNAL TO MAX5185 ONLY. **MAX5182 ONLY. Figure 6.
PAGE 14
Dual, 10-Bit, 40MHz Current/Voltage Alternate-Phase Output DACs QSOP.EPS MAX5182/MAX5185 Package Information Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.