19-0517; Rev 0; 6/06
12-Bit, 2.3Gsps, Multi-Nyquist DAC
with Selectable Frequency Response
MAX1692
General Description
Features
o Industry-Leading Dynamic Performance
SFDR = 68dBc at f = 1200MHz
The MAX19692 12-bit, 2.3Gsps digital-to-analog converter
(DAC) enables direct digital synthesis of high-frequency
and wideband signals in baseband and higher Nyquist
zones. It has been optimized for wideband communica-
tions and radar applications. It has excellent spurious and
noise performance and can be used for synthesis of wide-
band signals in the frequency range from DC to more than
2GHz. The 2.3Gsps update rate allows digital generation
of signals with more than 1GHz bandwidth. The selectable
frequency response enables signal output with high SNR
and excellent gain flatness in the first three Nyquist zones,
reducing the number of upconversion stages needed in a
radio transmitter. With its unique ability to generate broad-
band signals over a wide frequency range, the MAX19692
enables ultra-high data rate wireless modems and multi-
standard software radio transmitters.
OUT
Noise Density = -162dBm/Hz at 200MHz
o 1GHz Signal Bandwidth
o Frequency Response Modes: NRZ, RZ, RF
o High SNR and Exceptional Gain Flatness in
Nyquist Zones 1, 2, 3
o 4:1 Multiplexed LVDS Inputs (Up to 575MHz Each)
o Internal 50Ω Differential Output Termination
o Low Power: 760mW (f
= 1000MHz)
CLK
o Compact 11mm x 11mm, 169 CSBGA Package
o Evaluation Kit Available (Order MAX19692EVKIT)
Ordering Information
PART
TEMP RANGE
PACKAGE
PKG CODE
The MAX19692 features an update rate up to 2.3Gsps,
and has four 12-bit multiplexed low-voltage differential
signaling (LVDS) input ports that each operate up to
575MHz. The device accepts a clock at the DAC update
rate that can be either a sine wave or a square wave. The
input data rate is 1/4 the DAC update rate. The
MAX19692 provides an LVDS data clock output to simpli-
fy interfacing to FPGA or ASIC devices.
The MAX19692 has three frequency response
output modes:
• Non-Return-to-Zero (NRZ) mode is the most common
in the industry and provides highest dynamic range
and output power in the 1st Nyquist zone.
MAX19692EXW-D -40°C to +85°C 169 CSBGA X16911-1
Functional Diagram
RZ RF
DAP[11:0]
DAN[11:0]
12 x 2
AV
AV
DD3.3
FREQUENCY
RESPONSE
SELECT
CLK
DBP[11:0]
DBN[11:0]
12 x 2
12 x 2
V
DD1.8
DCP[11:0]
DCN[11:0]
4:1
GND
REGISTERED
MUX
12
DDP[11:0]
DDN[11:0]
12 x 2
OUTP
OUTN
DAC
DATACLKP
DATACLKN
2
/8
CLOCK
/16 DIVIDER
/4
CAL
• Return-to-Zero (RZ) mode trades off SNR for
improved gain flatness in the 1st, 2nd, and 3rd
Nyquist zones.
• Radio Frequency (RF) mode provides higher SNR
and excellent dynamic performance in the 2nd and
3rd Nyquist zones.
REFRES
REFIO
FSADJ
DACREF
CLKDIV
BANDGAP
REFERENCE
MAX19692
DELAY
CLKP
CLK
CLKN
The MAX19692 is a current-steering DAC with an inte-
grated, self-calibrated 50Ω differential output termina-
tion to ensure optimum dynamic performance. The
MAX19692 operates from 3.3V and 1.8V power sup-
plies and consumes 760mW at 1.0Gsps.
SELECTABLE FREQUENCY RESPONSE
0
-5
NRZ
RF
RZ
-10
-15
-20
-25
-30
-35
-40
Applications
Radar Waveform and
LO Signal Synthesis
Digital IF Generation in
X-Band Transmitters
Arbitrary Waveform
Generators
Direct Digital Synthesis
Automatic Test
Equipment
Direct Digital Generation
of Wideband RF Signals
Up to 2GHz
0
0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0
NORMALIZED TO DAC UPDATE RATE (f
f
)
CLK
Pin Configuration appears at end of data sheet.
OUT
________________________________________________________________ Maxim Integrated Products
1
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.
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