AD9705 Analog Devices, AD9705 Datasheet - Page 41

• Manufacturer Part Number: AD9705
• Manufacturer: Analog Devices

Specifications of AD9705

• Resolution (bits): 10bit
• Dac Update Rate: 175MSPS
• Dac Settling Time: 11ns
• Max Pos Supply (v): +3.6V
• Single-supply: Yes
• Dac Type: Current Out
• Dac Input Format: Par

Data Sheet
DIFFERENTIAL BUFFERED OUTPUT USING AN OP
AMP
A dual op amp (see the circuit shown in Figure 90) can be used in
a differential version of the single-ended buffer shown in Figure 89.
The same R-C network is used to form a 1-pole differential,
low-pass filter to isolate the op amp inputs from the high
frequency images produced by the DAC outputs. The feedback
resistors, R
formula:
The common-mode voltage of the output is determined by the
following formula:
The maximum and minimum voltages out of the amplifier are,
respectively, the following:
V
V
V
V
OUT
MIN
CM
MAX
AD9704/AD9705
AD9706/AD9707
= V
= R
=
FB
=
V
, determine the peak signal swing by the following
V
FB
MAX
MAX
Figure 90. Single-Supply Differential Buffer
REF
× I
− V
IOUTA
IOUTB
REFIO
OTCM
−
×
FS
V
⎛
⎜
⎜
⎝
OUT
1
OUT
2
+
21
19
23
20
R
R
FB
B
R
R
S
⎞
⎟
⎟
⎠
S
C
R
R
B
B
ADA4841-2
ADA4841-2
–
+
+
–
R
R
C
C
FB
FB
F
F
V
V
OUT
OUT
Rev. B | Page 41 of 44
EVALUATION BOARD
The
connects to the Analog Devices DAC pattern generator (DPG)
to allow for quick evaluation. The DPG generates Analog Devices
provided and user created digital vectors that are input into the
AD9704/AD9705/AD9706/AD9707
provided with the evaluation board allows the user to program
the registers in the product and the DPG. The AD9704/AD9705/
AD9706/AD9707
port that also provides the
SPI port interface.
AD9704/AD9705/AD9706/AD9707
AD9704/AD9705/AD9706/AD9707
evaluation board is powered from a PC USB
AD9704/AD9705/AD9706/AD9707
at speed. A software suite
evaluation board