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參數(shù)資料
| 型號(hào)： | AD9481-PCBZ |
| 廠商： | Analog Devices Inc |
| 文件頁數(shù)： | 10/28頁 |
| 文件大?。?/td> | 0K |
| 描述： | BOARD EVAL 8BIT 250MSPS 44-TQFP |
| 標(biāo)準(zhǔn)包裝： | 1 |
| ADC 的數(shù)量： | 1 |
| 位數(shù)： | 8 |
| 采樣率（每秒）： | 250M |
| 數(shù)據(jù)接口： | 并聯(lián) |
| 輸入范圍： | 1 Vpp |
| 在以下條件下的電源（標(biāo)準(zhǔn)）： | 439mW @ 250MSPS |
| 工作溫度： | -40°C ~ 85°C |
| 已用 IC / 零件： | AD9481 |
| 已供物品： | 板 |
| 相關(guān)產(chǎn)品： | AD9481BSUZ-250-ND - IC ADC 8BIT 250MSPS 3.3V 44-TQFP |
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AD9481
Rev. 0 | Page 18 of 28
Fixed Reference
The internal reference can be configured for a differential span
of 1 V p-p (see Figure 34). It is recommended to place a 0.1 F
capacitor as close as possible to the VREF pin; a 10 F capacitor
is also required (see the PCB layout for guidance). If the internal
reference of the AD9481 is used to drive multiple converters to
improve gain matching, the loading of the reference by the
other converters must be considered. Figure 34 depicts how the
internal reference voltage is affected by loading.
TEMPERATURE (
°C)
VR
EF
(
V
)
1.0085
1.0080
1.0075
1.0060
1.0055
1.0065
1.0070
1.0050
1.0045
1.0040
1.0035
–40
–20
0
20
40
60
80
05045-033
Figure 32. Typical Reference Variation with Temperature
05045-034
0.1
F
10
F
VREF
SENSE
Figure 33. Internal Fixed Reference (1 V p-p)
IREF (mA)
%
CHANGE
IN
V
R
E
F
V
O
LTAGE
0
–0.1
–0.2
–0.4
–0.3
–0.5
0
0.5
1.5
1.0
2.0
2.5
3.0
05045-035
Figure 34. Internal VREF vs. Load Current
Table 8. Reference Configurations
SENSE Voltage
Resulting VREF
Reference
Differential Span
AVDD
N/A (external reference input)
External
1 × external reference voltage
0.5 V (Self-Biased)
0.5 × (1 + R1/R2) V
Programmable
1 × VREF (0.75 V p-p to 1.5 V p-p)
AGND to 0.2 V
1.0 V
Internal fixed
1 V p-p
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