參數(shù)資料
型號： AD9259ABCPZ-50
廠商： Analog Devices Inc
文件頁數(shù)： 29/52頁
文件大?。?/td> 0K
描述： IC ADC 14BIT SRL 50MSPS 48LFCSP
標(biāo)準(zhǔn)包裝： 1
位數(shù)： 14
采樣率（每秒）： 50M
數(shù)據(jù)接口： 串行，SPI?
轉(zhuǎn)換器數(shù)目： 4
功率耗散（最大）： 409mW
電壓電源： 模擬和數(shù)字
工作溫度： -40°C ~ 85°C
安裝類型： 表面貼裝
封裝/外殼： 48-VFQFN 裸露焊盤，CSP
供應(yīng)商設(shè)備封裝： 48-LFCSP-VQ（7x7）
包裝： 托盤
輸入數(shù)目和類型： 8 個(gè)單端，單極；4 個(gè)差分，單極
Data Sheet
AD9259
Rev. E | Page 35 of 52
EVALUATION BOARD
The AD9259 evaluation board provides all of the support cir-
cuitry required to operate the ADC in its various modes and
configurations. The converter can be driven differentially using a
transformer (default) or a AD8332 driver. The ADC can also be
driven in a single-ended fashion. Separate power pins are provided
to isolate the DUT from the drive circuitry of the AD8332. Each
input configuration can be selected by changing the connection
of various jumpers (see Figure 62 to Figure 66). Figure 60 shows
the typical bench characterization setup used to evaluate the ac
performance of the AD9259. It is critical that the signal sources
used for the analog input and clock have very low phase noise
(<1 ps rms jitter) to realize the optimum performance of the
converter. Proper filtering of the analog input signal to remove
harmonics and lower the integrated or broadband noise at the
input is also necessary to achieve the specified noise performance.
See Figure 62 to Figure 70 for the complete schematics and
layout diagrams demonstrating the routing and grounding
techniques that should be applied at the system level.
POWER SUPPLIES
This evaluation board has a wall-mountable switching power
supply that provides a 6 V, 2 A maximum output. Connect the
supply to the rated 100 V ac to 240 V ac wall outlet at 47 Hz to
63 Hz. The other end of the supply is a 2.1 mm inner diameter
jack that connects to the PCB at P503. Once on the PC board,
the 6 V supply is fused and conditioned before connecting to
three low dropout linear regulators that supply the proper bias
to each of the various sections on the board.
When operating the evaluation board in a nondefault condition,
L504 to L507 can be removed to disconnect the switching
power supply. This enables the user to bias each section of the
board individually. Use P501 to connect a different supply for
each section. At least one 1.8 V supply is needed for AVDD_DUT
and DRVDD_DUT; however, it is recommended that separate
supplies be used for analog and digital signals and that each
supply have a current capability of 1 A. To operate the evaluation
board using the VGA option, a separate 5.0 V analog supply
(AVDD_5 V) is needed. To operate the evaluation board using
the SPI and alternate clock options, a separate 3.3 V analog
supply (AVDD_3.3 V) is needed in addition to the other
supplies.
INPUT SIGNALS
When connecting the clock and analog source to the evaluation
board, use clean signal generators with low phase noise, such as
Rohde & Schwarz SMA or HP8644 signal generators or the
equivalent, as well as a 1 m, shielded, RG-58, 50 coaxial cable.
Enter the desired frequency and amplitude from the ADC speci-
fications tables. Typically, most Analog Devices, Inc., evaluation
boards can accept approximately 2.8 V p-p or 13 dBm sine wave
input for the clock. When connecting the analog input source, it
is recommended to use a multipole, narrow-band, band-pass
filter with 50 terminations. Good choices of such band-pass
filters are available from TTE, Allen Avionics, and K&L
Microwave, Inc. The filter should be connected directly to the
evaluation board if possible.
OUTPUT SIGNALS
The default setup uses the Analog Devices HSC-ADC-FIFO5-
INTZ to interface with the Analog Devices standard dual-
channel FIFO data capture board (HCS-ADC-EVALCZ). Two
of the eight channels can be evaluated at the same time. For
more information on the channel settings and optional settings
of these boards, visit www.analog.com/FIFO.
ROHDE & SCHWARZ,
SMA,
2V p-p SIGNAL
SYNTHESIZER
ROHDE & SCHWARZ,
SMA,
2V p-p SIGNAL
SYNTHESIZER
BAND-PASS
FILTER
XFMR
INPUT
CLK
CH A TO CH D
14-BIT
SERIAL
LVDS
USB
CONNECTION
AD9259
EVALUATION BOARD
HSC-ADC-EVALCZ
FIFO DATA
CAPTURE
BOARD
PC
RUNNING
ADC
ANALYZER
AND SPI
USER
SOFTWARE
1.8V
–
+
–
+
A
V
DD_DUT
A
V
DD_3.
3V
D
R
V
DD_DUT
G
ND
G
ND
–
+
5.0V
G
ND
A
V
DD_5V
1.8V
6V DC
2A MAX
WALL OUTLET
100V TO 240V AC
47Hz TO 63Hz
SWITCHING
POWER
SUPPLY
–
+
G
ND
3.3V
–
+
V
CC
G
ND
3.3V
SPI
05965-
014
INTERPOSER
BOARD
SPI
Figure 60. Evaluation Board Connection
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