参数资料
型号: AD9481-PCBZ
厂商: Analog Devices Inc
文件页数: 10/28页
文件大小: 0K
描述: BOARD EVAL 8BIT 250MSPS 44-TQFP
标准包装: 1
ADC 的数量: 1
位数: 8
采样率(每秒): 250M
数据接口: 并联
输入范围: 1 Vpp
在以下条件下的电源(标准): 439mW @ 250MSPS
工作温度: -40°C ~ 85°C
已用 IC / 零件: AD9481
已供物品:
相关产品: AD9481BSUZ-250-ND - IC ADC 8BIT 250MSPS 3.3V 44-TQFP
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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