AD9772AASTZ Analog Devices Inc, AD9772AASTZ Datasheet - Page 31

• Manufacturer Part Number: AD9772AASTZ
• Description: IC DAC 14BIT 160MSPS 48-LQFP
• Manufacturer: Analog Devices Inc
• Series: TxDAC+®r

Specifications of AD9772AASTZ

• Data Interface: Parallel
• Settling Time: 11ns
• Number Of Bits: 14
• Number Of Converters: 1
• Voltage Supply Source: Analog and Digital
• Power Dissipation (max): 272mW
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 48-LQFP
• Resolution (bits): 14bit
• Sampling Rate: 160MSPS
• Input Channel Type: Parallel
• Supply Voltage Range - Analog: 3.1V To 3.5V
• Supply Current: 37mA
• Digital Ic Case Style: QFP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• For Use With: AD9772A-EB - BOARD EVAL FOR AD9772A
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant, Lead free / RoHS Compliant

Regardless of which image is selected for a given application, the
adjacent images must be sufficiently filtered. In most cases, a SAW
filter providing differential inputs represents the optimum device
for this purpose. For single-ended SAW filters, a balanced-to-
unbalanced RF transformer is recommended. The high output
impedance of the AD9772A provides a certain amount of
flexibility in selecting the optimum resistive load, R
as any matching network.
For many applications, the data update rate for the DAC (that is,
f
clock (for example, GSM − 13 MHz). Furthermore, these
applications prefer to use standard IF frequencies, which offer a
large selection of SAW filter choices with various pass bands
(for example, 70 MHz). In addition, these applications may
benefit from the AD9772A’s direct IF mode capabilities when used
in conjunction with a digital upconverter, such as the AD6622.
Because the AD6622 can digitally synthesize and tune up to four
modulated carriers, it is possible to judiciously tune these carriers
in a region falling within the pass band an IF filter while the
AD9772A is reconstructing a waveform. Figure 59 shows an
example in which four carriers are tuned around 18 MHz with a
digital upconverter operating at 52 MSPS such that when
reconstructed by the AD9772A in the IF mode, these carriers fall
around a 70 MHz IF.
DATA
) must be a fixed integer multiple of a system reference
LOAD
, as well
Rev. C | Page 31 of 40
Figure 59. Spectral Plot of Four Carriers at 60 MHz IF with f
–110
–10
–20
–30
–40
–50
–60
–70
–80
–90
66
68
FREQUENCY (MHz)
PLLVDD = 0
70
72
AD9772A
DATA
74
= 52 MSPS,