19-3545; Rev 2; 10/08
16-Bit, 500Msps Interpolating and Modulating
Dual DAC with CMOS Inputs
MAX895
General Description
Features
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.
o 71dB ACLR at f
= 61.44MHz (Four-Carrier
OUT
WCDMA)
®
o Meets Multicarrier UMTS, cdma2000 , GSM
Spectral Masks (f
= 122MHz)
OUT
o Noise Spectral Density = -158dBFS/Hz at
f
= 16MHz
OUT
o 92dBc SFDR at Low-IF Frequency (10MHz)
o 90dBc SFDR at High-IF Frequency (50MHz)
o Low Power: 511mW (f
o User Programmable
= 100MHz)
CLK
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.
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, fIM/2, or
fIM/4
Selectable Output Filter: Lowpass or Highpass
Channel Gain and Offset Adjustment
The MAX5895 features a f /4 digital image-reject mod-
IM
o EV Kit Available (Order the MAX5895 EV Kit)
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
Ordering Information
PART
TEMP RANGE
-40°C to +85°C
-40°C to +85°C
PIN-PACKAGE
frequency-translated with image pairs at f /2 or f /4.
IM
IM
MAX5895EGK-D
MAX5895EGK+D
D = Dry pack.
68 QFN-EP*
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-
68 QFN-EP*
*EP = Exposed pad.
ters, f /2, f /4 or no digital quadrature modulation with
IM
IM
+Denotes a lead-free/RoHS-compliant package.
image rejection, channel gain and offset adjustment, and
offset binary or two’s complement data interface.
Selector Guide
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.
RESOLUTION DAC UPDATE
INPUT
LOGIC
PART
(BITS)
RATE (Msps)
MAX5893
MAX5894
MAX5895
MAX5898
12
14
16
16
500
500
500
500
CMOS
CMOS
CMOS
LVDS
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
Simplified Diagram
OUTI
DAC
DATA
PORT A
Pin Configuration appears at end of data sheet.
DATACLK
DATA
PORT B
SPI is a trademark of Motorola, Inc.
cdma2000 is a registered trademark of the Telecommunications
Industry Association.
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.