參數(shù)資料
型號: AD9251BCPZ-40
廠商: Analog Devices Inc
文件頁數(shù): 16/36頁
文件大小: 0K
描述: IC ADC 14BIT 40MSPS 64LFCSP
標(biāo)準(zhǔn)包裝: 1
位數(shù): 14
采樣率(每秒): 40M
數(shù)據(jù)接口: 串行,SPI?
轉(zhuǎn)換器數(shù)目: 2
功率耗散(最大): 105.5mW
電壓電源: 模擬和數(shù)字
工作溫度: -40°C ~ 85°C
安裝類型: 表面貼裝
封裝/外殼: 64-VFQFN 裸露焊盤,CSP
供應(yīng)商設(shè)備封裝: 64-LFCSP-VQ(9x9)
包裝: 托盤
輸入數(shù)目和類型: 4 個單端,單極;2 個差分,單極
AD9251
Rev. A | Page 23 of 36
VOLTAGE REFERENCE
A stable and accurate 1.0 V voltage reference is built into the
AD9251. The VREF can be configured using either the internal
1.0 V reference or an externally applied 1.0 V reference voltage.
The various reference modes are summarized in the sections that
follow. The Reference Decoupling section describes the best
practices PCB layout of the reference.
Internal Reference Connection
A comparator within the AD9251 detects the potential at the
SENSE pin and configures the reference into two possible
modes, which are summarized in Table 10. If SENSE is grounded,
the reference amplifier switch is connected to the internal resistor
divider (see Figure 46), setting VREF to 1.0 V.
VREF
SENSE
0.5V
ADC
SELECT
LOGIC
0.1F
1.0F
VIN–A/VIN–B
VIN+A/VIN+B
ADC
CORE
07
93
8-
0
12
Figure 46. Internal Reference Configuration
If the internal reference of the AD9251 is used to drive multiple
converters to improve gain matching, the loading of the reference
by the other converters must be considered. Figure 47 shows
how the internal reference voltage is affected by loading.
0
–3.0
02
LOAD CURRENT (mA)
RE
F
E
RE
NCE
V
O
L
T
AG
E
RR
O
R
(
%
)
.0
–0.5
–1.0
–1.5
–2.0
–2.5
0.2
0.4
0.6
0.8
1.0
1.4
1.6
1.8
1.2
0
793
8-
0
14
INTERNAL VREF = 0.993V
Figure 47. VREF Accuracy vs. Load Current
Table 10. Reference Configuration Summary
Selected Mode
SENSE Voltage (V)
Resulting VREF (V)
Resulting Differential Span (V p-p)
Fixed Internal Reference
AGND to 0.2
1.0 internal
2.0
Fixed External Reference
AVDD
1.0 applied to external VREF pin
2.0
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