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| 型號： | AD9202 |
| 廠商： | Analog Devices, Inc. |
| 英文描述： | Complete 10-Bit, 32 MSPS, 90 mW CMOS A/D Converter(32MSPS,10位A/D轉(zhuǎn)換器) |
| 中文描述： | 完整的10位，32 MSPS的90毫瓦的CMOS A / D轉(zhuǎn)換（32MSPS，10位的A / D轉(zhuǎn)換器） |
| 文件頁數(shù)： | 17/24頁 |
| 文件大小： | 369K |
| 代理商： | AD9202 |
AD9202
–17–
REV. B
Figure 33 shows a simplified schematic of the AD9202 config-
ured in an IF sampling application. To reduce the complexity of
the digital demodulator in many quadrature demodulation ap-
plications, the IF frequency and/or sample rate are selected such
that the bandlimited IF signal aliases back into the center of the
ADC’s baseband region (i.e., F
S
/4). For example, if an IF sig-
nal centered at 45 MHz is sampled at 20 MSPS, an image of
this IF signal will be aliased back to 5.0 MHz which corre-
sponds to one quarter of the sample rate (i.e., F
S
/4). This
demodulation technique typically reduces the complexity of the
post digital demodulator ASIC which follows the ADC.
To maximize its distortion performance, the AD9202 is config-
ured in the differential mode with a 1 V span using a transformer.
The center tap of the transformer is biased at midsupply via a
resistor divider. Preceding the AD9202 is a bandpass filter as
well as a 32 dB gain stage. A large gain stage may be required
to compensate for the high insertion losses of a SAW filter used
for image rejection. The gain stage will also provide adequate
isolation for the SAW filter from the charge “kick back” currents
associated with AD9202’s input stage.
The gain stage can be realized using one or two cascaded
AD8009 op amps amplifiers. The AD8009 is a low cost, 1GHz,
current-feedback op amp having a 3rd order intercept character-
ized up to 250 MHz. A passive bandpass filter following the
AD8009 attenuates its dominant 2nd order distortion products
which would otherwise be aliased back into the AD9202’s
baseband region. Also, it reduces any out-of-band noise which
would also be aliased back due to the AD9202’s noise band-
width of 220+ MHz. Note, the bandpass filters specifications
are application dependent and will affect both the total distor-
tion and noise performance of this circuit.
The distortion and noise performance of an ADC at the given
IF frequency is of particular concern when evaluating an ADC
for a narrowband IF sampling application. Both single-tone and
dual-tone SFDR vs. amplitude are very useful in an assessing an
ADC’s noise performance and noise contribution due to aper-
ture jitter. In any application, one is advised to test several units
of the same device under the same conditions to evaluate the
given applications sensitivity to that particular device.
Figures 34–37 combine the dual-tone SFDR as well as single
tone SFDR and SNR performance at IF frequencies of 45 MHz,
70 MHz, 85 MHz and 135 MHz. Note, the SFDR vs. ampli-
tude data is referenced to dBFS while the single tone SNR data
is referenced to dBc. The performance characteristics in these
figures are representative of the AD9202 without the AD8009.
The AD9202 was operated in the differential mode (via trans-
former) with a 1 V span.
80
–40
–35
30
INPUT POWER LEVEL – dBFS
60
S
90
50
70
–30
–25
–20
–15
–10
–5
0
40
20
10
SNR
SINGLE-TONE SFDR
DUAL-TONE SFDR
Figure 34. SNR/SFDR for IF @ 45 MHz (Clock = 27.5 MHz)
80
–40
–35
30
INPUT POWER LEVEL – dBFS
60
S
90
50
70
–30
–25
–20
–15
–10
–5
0
40
20
10
SNR
SINGLE-TONE SFDR
DUAL-TONE SFDR
Figure 35. SNR/SFDR for IF @ 70 MHz (Clock = 31.1 MHz)
0.1
m
F
AIN
REFTS
AD9202
REFBS
REFSENSE
VREF
AVDD
200
V
1k
V
1k
V
50
V
93.1
V
280
V
50
V
22.1
V
200
V
SAW
FILTER
OUTPUT
50
V
BANDPASS
FILTER
G
1
= 20dB
G
2
= 12dB
L-C
MINI CIRCUITS
T4 - 6T
1:4
Figure 33. Simplified IF Sampling Circuit
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