AD9222 Analog Devices, AD9222 Datasheet - Page 42

• Manufacturer Part Number: AD9222
• Description: Octal, 12-Bit, 40/50/65 MSPS Serial LVDS 1.8 V A/D Converter
• Manufacturer: Analog Devices

Specifications of AD9222

• Resolution (bits): 12bit
• # Chan: 8
• Sample Rate: 65MSPS
• Interface: LVDS,Ser
• Analog Input Type: Diff-Uni
• Ain Range: 2 V p-p
• Adc Architecture: Pipelined
• Pkg Type: CSP

AD9222
ALTERNATIVE ANALOG INPUT DRIVE
CONFIGURATION
The following is a brief description of the alternative analog
input drive configuration using the
drive option is in use, some components may need to be
populated, in which case all the necessary components are listed
in Table 17. For more details on the
including how it works and its optional pin settings, consult the
AD8334
To configure the analog input to drive the VGA instead of the
default transformer option, the following components need to
be removed and/or changed.
•
•
•
•
•
•
In this configuration, L505 to L520 and L605 to L620 are
populated with 0 Ω resistors to allow signal connection and use
of a filter if additional requirements are necessary.
Remove R102, R115, R128, R141, R161, R162, R163, R164,
R202, R208, R218, R225, R234, R241, R252, R259, T101,
T102, T103, T104, T201, T202, T203, and T204 in the
default analog input path.
Populate R101, R114, R127, R140, R201, R217, R233, and
R251 with 0 Ω resistors in the analog input path.
Populate R152, R153, R154, R155, R156, R157, R158, R159,
R215, R216, R229, R230, R247, R248, R263, R264, C103,
C105, C110, C112, C117, C119, C124, C126, C203, C205,
C210, C212, C217, C219, C224, and C226 with 10 kΩ
resistors to provide an input common-mode level to the
ADC analog inputs.
Populate R105, R113, R118, R124, R131, R137, R151, R160,
R205, R213, R221, R222, R237, R238, R255, and R256 with
0 Ω resistors in the ADC analog input path to connect the
VGA outputs.
Remove R515, R520, R527, R532, R615, R620, R627, and
R632 on the
Remove R512, R524, R612, and R624 to set the
mode and
require this to be different. Consult the
for more information on these functions.
data sheet.
AD8334
AD8334
HILO pin low. Some applications may
analog outputs.
AD8334
AD8334
dual VGA. If this
AD8334
dual VGA,
AD8334
data sheet
Rev. F | Page 42 of 60
In this example, a 16 MHz, two-pole low-pass filter was applied
to the
removed and/or changed:
•
•
•
AD8334 = Maximum Gain Setting, Analog Input Signal = −1.03 dBFS, SNR =
Figure 89. AD9222 FFT Example Results Using 16 MHz, Two-Pole Low-Pass
Figure 88. Example Filter Configured for16 MHz, Two-Pole Low-Pass Filter
Filter Applied to the AD8334 Outputs (f
Remove L507, L508, L511, L512, L515, L516, L519, L520,
L607, L608, L611, L612, L615, L616, L619, and L620 on the
AD8334
Populate L507, L508, L511, L512, L515, L516, L519, L520,
L607, L608, L611, L612, L615, L616, L619, and L620 with
680 nH inductors.
Populate C543, C547, C551, C555, C643, C647, C651, and
C655 with a 68 pF capacitor.
AD8334
–100
–120
–20
–40
–60
–80
0
0
analog outputs.
outputs. The following components need to be
2.5
5.0
680nH
680nH
60.8 dBc, SFDR = 67.02 dBc)
7.5
FREQUENCY (MHz)
10.0
12.5
AD8334 = MAX GAIN SETTING
SAMPLE
68pF
15.0
= 50 MSPS, AIN = 3.5 MHz,
17.5
f
SAMPLE
Data Sheet
AIN = 3.5MHz
20.0
= 50MSPS
22.5
25.0