AD9773-EB Analog Devices Inc, AD9773-EB Datasheet - Page 4

• Manufacturer Part Number: AD9773-EB
• Description: BOARD EVAL FOR AD9773
• Manufacturer: Analog Devices Inc
• Series: TxDAC®r

Specifications of AD9773-EB

• Rohs Status: RoHS non-compliant
• Number Of Dac's: 2
• Number Of Bits: 12
• Outputs And Type: 2, Differential
• Sampling Rate (per Second): 160M
• Data Interface: Parallel
• Settling Time: 11ns
• Dac Type: Current
• Voltage Supply Source: Analog and Digital
• Operating Temperature: -40°C ~ 85°C
• Utilized Ic / Part: AD9773

AD9773
GENERAL DESCRIPTION
The AD9773
compatible, high performance, programmable 2×/4×/8×
interpolating TxDAC+® family. The AD977x family features
a serial port interface (SPI) that provides a high level of
programmability, thus allowing for enhanced system-level
options. These options include selectable 2×/4×/8× interpo-
lation filters; f
with image rejection; a direct IF mode; programmable channel
gain and offset control; programmable internal clock divider;
straight binary or twos complement data interface; and a single-
port or dual-port data interface.
The selectable 2×/4×/8× interpolation filters simplify the
requirements of the reconstruction filters while simultaneously
enhancing the TxDAC+ family’s pass-band noise/distortion
performance. The independent channel gain and offset adjust
registers allow the user to calibrate LO feedthrough and side-
band suppression errors associated with analog quadrature
modulators. The 6 dB of gain adjustment range can also be
used to control the output power level of each DAC.
The AD9773 features the ability to perform f
digital modulation and image rejection when combined with an
analog quadrature modulator. In this mode, the AD9773
accepts I and Q complex data (representing a single or multi-
carrier waveform), generates a quadrature modulated IF signal
along with its orthogonal representation via its dual DACs, and
presents these two reconstructed orthogonal IF carriers to an
analog quadrature modulator to complete the image rejection
upconversion process. Another digital modulation mode (for
example, the direct IF mode) allows the original baseband
signal representation to be frequency translated such that pairs
of images fall at multiples of one-half the DAC update rate.
The AD977x family includes a flexible clock interface accepting
differential or single-ended sine wave or digital logic inputs.
An internal PLL clock multiplier is included and generates the
necessary on-chip high frequency clocks. It can also be disabled
to allow the use of a higher performance external clock source.
An internal programmable divider simplifies clock generation
in the converter when using an external clock source. A flexible
data input interface allows for straight binary or twos complement
formats and supports single-port interleaved or dual-port data.
1
Protected by U.S. Patent Numbers 5,568,145; 5,689,257; and 5,703,519. Other
patents pending.
1
S
is the 12-bit member of the AD977x pin-
/2, f
S
/4, or f
S
/8 digital quadrature modulation
S
/2, f
S
/4, and f
S
/8
Rev. D | Page 4 of 60
Dual high performance DAC outputs provide a differential
current output programmable over a 2 mA to 20 mA range. The
AD9773 is manufactured on an advanced 0.35 micron CMOS
process, operates from a single supply of 3.1 V to 3.5 V, and
consumes 1.2 W of power.
Targeted at a wide dynamic range, multicarrier, and multi-
standard systems, the superb baseband performance of the
AD9773 is ideal for wide band CDMA, multicarrier CDMA,
multicarrier TDMA, multicarrier GSM, and high performance
systems employing high order QAM modulation schemes. The
image rejection feature simplifies and can help to reduce the
number of signal band filters needed in a transmit signal chain.
The direct IF mode helps to eliminate a costly mixer stage for a
variety of communications systems.
PRODUCT HIGHLIGHTS
1.
2.
3.
4.
5.
6.
7.
8.
9.
10. Flexible clock input with single-ended or differential input,
11. Low power: Complete CMOS DAC operates on 1.2 W from a
12. On-chip voltage reference: The AD9773 includes a 1.20 V
13. 80-lead thin quad flat package, exposed pad (TQFP_EP).
The AD9773 is the 12-bit member of the AD977x pin
compatible, high performance, programmable 2×/4×/8×
interpolating TxDAC+ family.
Direct IF transmission is possible for 70 MHz + IFs
through a novel digital mixing process.
f
selectable image rejection simplify/remove cascaded SAW
filter stages.
A 2×/4×/8× user selectable interpolating filter eases data
rate and output signal reconstruction filter requirements.
User selectable twos complement/straight binary
data coding.
User programmable channel gain control over 1 dB range
in 0.01 dB increments.
User programmable channel offset control ±10% over
the FSR.
Ultrahigh speed 400 MSPS DAC conversion rate.
Internal clock divider provides data rate clock for
easy interfacing.
CMOS, or 1 V p-p LO sine wave input capability.
3.1 V to 3.5 V single supply. The 20 mA full-scale current can
be reduced for lower power operation, and several sleep
functions reduce power during idle periods.
temperature compensated band gap voltage reference.
S
/2, f
S
/4, and f
S
/8 digital quadrature modulation and user