MAX5895_08 Datasheet, PDF (1/31 Pages) Maxim Integrated Products – 16-Bit, 500Msps Interpolating and Modulating Dual DAC with CMOS Inputs

19-3545; Rev 2; 10/08
EVAALVUAAILTAIOBNLEKIT
16-Bit, 500Msps Interpolating and Modulating
Dual DAC with CMOS Inputs
General Description
The MAX5895 programmable interpolating, modulating,
500Msps, dual digital-to-analog converter (DAC) offers
superior dynamic performance and is optimized for
high-performance, wideband single- and multicarrier
transmit applications. The device integrates a selectable
2x/4x/8x interpolating filter, a digital quadrature modula-
tor, and dual 16-bit high-speed DACs on a single IC. At
30MHz output frequency and 500Msps update rate, the
in-band SFDR is 88dBc while consuming 1.1W. The
device also delivers 71dB ACLR for four-carrier WCDMA
at a 61.44MHz output frequency.
The selectable interpolating filters allow lower input data
rates while taking advantage of the high DAC update
rates. These linear-phase interpolation filters ease
reconstruction filter requirements and enhance the
passband dynamic performance. Individual offset and
gain programmability allow the user to calibrate out local
oscillator (LO) feedthrough and sideband suppression
errors generated by analog quadrature modulators.
The MAX5895 features a f_IM/4 digital image-reject mod-
ulator. This modulator generates a quadrature-modulat-
ed IF signal that can be presented to an analog I/Q
modulator to complete the upconversion process. A
second digital modulation mode allows the signal to be
frequency-translated with image pairs at f_IM/2 or f_IM/4.
The MAX5895 features a standard 1.8V CMOS, 3.3V tol-
erant data input bus for easy interface. A 3.3V SPI™ port
is provided for mode configuration. The programmable
modes include the selection of 2x/4x/8x interpolating fil-
ters, f_IM/2, f_IM/4 or no digital quadrature modulation with
image rejection, channel gain and offset adjustment, and
offset binary or two’s complement data interface.
Pin-compatible 12- and 14-bit devices are also available.
Refer to the MAX5894 data sheet for the 14-bit version
and the MAX5893 data sheet for the 12-bit version.
Applications
Base Stations: 3G Multicarrier UMTS, CDMA, and GSM
Broadband Wireless Transmitters
Broadband Cable Infrastructure
Instrumentation and Automatic Test Equipment (ATE)
Analog Quadrature Modulation Architectures
Pin Configuration appears at end of data sheet.
SPI is a trademark of Motorola, Inc.
cdma2000 is a registered trademark of the Telecommunications
Industry Association.
Features
o 71dB ACLR at f_OUT = 61.44MHz (Four-Carrier
WCDMA)
o Meets Multicarrier UMTS, cdma2000^®, GSM
Spectral Masks (f_OUT = 122MHz)
o Noise Spectral Density = -158dBFS/Hz at
f_OUT = 16MHz
o 92dBc SFDR at Low-IF Frequency (10MHz)
o 90dBc SFDR at High-IF Frequency (50MHz)
o Low Power: 511mW (f_CLK = 100MHz)
o User Programmable
Selectable 2x, 4x, or 8x Interpolating Filters
< 0.01dB Passband Ripple
> 99dB Stopband Rejection
Selectable Real or Complex Modulator Operation
Selectable Modulator LO Frequency: OFF, f_IM/2, or
f_IM/4
Selectable Output Filter: Lowpass or Highpass
Channel Gain and Offset Adjustment
o EV Kit Available (Order the MAX5895 EV Kit)
Ordering Information
PART
TEMP RANGE
PIN-PACKAGE
MAX5895EGK-D
-40°C to +85°C
68 QFN-EP*
MAX5895EGK+D
-40°C to +85°C
68 QFN-EP*
D = Dry pack.
*EP = Exposed pad.
+Denotes a lead-free/RoHS-compliant package.
Selector Guide
PART
MAX5893
MAX5894
MAX5895
MAX5898
RESOLUTION
(BITS)
12
14
16
16
DAC UPDATE
RATE (Msps)
500
500
500
500
INPUT
LOGIC
CMOS
CMOS
CMOS
LVDS
Simplified Diagram
DATA
PORT A
DATACLK
DATA
PORT B
OUTI
DAC
DAC
OUTQ
________________________________________________________________ Maxim Integrated Products 1
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.