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參數(shù)資料
| 型號(hào)： | AD9481-PCBZ |
| 廠商： | Analog Devices Inc |
| 文件頁數(shù)： | 15/28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 22 of 28
OPTIONAL XTAL
The PCB has been designed to accommodate an optional
crystal oscillator that can serve as a convenient clock source.
The footprint can accept both through-hole and surface-mount
devices, including Vectron XO-400 and Vectron VCC6 family
oscillators.
05045-038
VCC
OUT–
OUT+
GND
Figure 38. XTAL Footprint
To use either crystal, populate C38 and C40 with 0.1 F capaci-
tors. Populate R48 and R49 with 0 resistors. Place R50, R51,
R59, and R60 with 1 k resistors. Remove C6 and C5. If the
Vectron VCC6 family crystal is being used, populate R57 with a
10 resistor. If using the XO-400 crystal, place jumper E21 or
E22 to E23.
VOLTAGE REFERENCE
The AD9481 has an internal 1 V reference mode. The ADC uses
the internal 1 V reference as the default when sense is set to
ground. An optional on-board external 1.0 V reference
(ADR510) can be used by setting the sense jumper to AVDD, by
placing a jumper on E5 to E3, and by placing a 0 resistor on
R55. When using an external programmable reference, (R20,
R30) remove the sense jumper.
DATA OUTPUTS
The ADC outputs are buffered on the PCB by LVT574 latches
on the data outputs. The latch outputs have series terminating
resistors at the output pins to minimize reflections.
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