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參數(shù)資料
| 型號： | AD9260EB |
| 廠商： | Analog Devices, Inc. |
| 英文描述： | High-Speed Oversampling CMOS ADC with 16-Bit Resolution at a 2.5 MHz Output Word Rate |
| 中文描述： | 高速16位分辨率在2.5 MHz的輸出字速率采樣的CMOS模數(shù)轉(zhuǎn)換器 |
| 文件頁數(shù)： | 27/36頁 |
| 文件大?。?/td> | 572K |
| 代理商： | AD9260EB |
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AD9260
–27–
REV. B
The scaling is accomplished by properly attaching an external
resistor to the BIAS pin of the AD9260 as shown in Table IX.
R
EXT
is normally 2 k
for a clock speed of 20 MHz and scales
inversely with clock rate. Because BIAS is an external pin, mini-
mization of capacitance to this pin is recommended in order to
prevent instability of the bias pin amplifier.
AVDD
4R
3R
2R
R
MODE PIN
AVSS
E
LATCH
CLOCK
ENCODED MODE
Figure 62. Simplified Mode Pin Circuitry
BIAS CURRENT
REXT
BIAS PIN
1V
Figure 63. Simplified Bias Pin Circuitry
POWER DISSIPATION CONSIDERATIONS
The power dissipation of the AD9260 is dependent on its
application-specific configuration and operating conditions.
The analog power dissipation as shown in Figure 64 is primarily
a function of its power bias setting and sample rate. It remains
insensitive to the particular input waveform being digitized or
digital filter MODE setting. The digital power dissipation is
primarily a function of the digital supply setting (i.e., +3 V to
+5 V), the sample rate and, to a lesser extent, the MODE setting
and input waveform. Figures 65a and 65b show the total current
dissipation of the
“
combined
”
digital (DVDD) and digital driver
supply (DRVDD) for +3 V and +5 V supplies. Note, DVDD
and DRVDD are typically derived from the same supply bus
since no degradation in performance results. A 1 MHz full-
scale sine wave was used to ensure maximum digital activity in
the digital filters and the digital drivers had a fanout of one.
Note also that a twofold decrease in digital supply current re-
sults when the digital supply is reduced form +5 V to +3 V.
SAMPLE RATE
–
MSPS
I
A
–
5
30
70
90
110
130
10
15
20
50
FULL BIAS-2k
HALF BIAS-4k
QUARTER BIAS-8k
Figure 64. I
AVDD
vs. Sample Rate (AVDD = +5 V,
Mode 1
×
–4
×
)
8
2
4
1
SAMPLE RATE
–
MSPS
I
D
/
D
–
5
6
10
12
14
16
10
15
20
8
4
2
0
Figure 65a. I
DVDD
/I
DRVDD
vs. Sample Rate (DVDD = DRVDD =
3 V, f
IN
= 1 MHz)
8
2
4
1
SAMPLE RATE
–
MSPS
I
D
/
D
–
5
10
20
25
30
10
15
20
15
5
0
Figure 65b. I
DVDD
/I
DRVDD
vs. Sample Rate (DVDD = DRVDD
= 5 V, f
IN
= 1 MHz)
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| AD9260-EB | 制造商:Analog Devices 功能描述:Evaluation Board For AD9260 制造商:Analog Devices 功能描述:DEV TOOLS, EVAL BD FOR AD9260 - Bulk |
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