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參數(shù)資料
| 型號(hào)： | AD9228 |
| 廠商： | Analog Devices, Inc. |
| 英文描述： | Quad, 12-bit, 40/65 MSPS Serial LVDS 1.8 V A/D Converter |
| 中文描述： | 四，12位，六十五分之四十○MSPS的串行LVDS 1.8弗吉尼亞州/ D轉(zhuǎn)換器 |
| 文件頁(yè)數(shù)： | 27/52頁(yè) |
| 文件大小： | 1659K |
| 代理商： | AD9228 |
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AD9228
Rev. 0 | Page 27 of 52
0
90
70
75
85
80
65
75
50
55
65
70
60
2
18
20
22
24
4
6
8
12
14
16
10
S
RESISTANCE (k
)
S
SNR
SFDR
Figure 62. SFDR vs. RBIAS
3
8
13
18
23
I
RESISTANCE (k
)
0
0
100
200
400
600
500
300
Figure 63. IAVDD vs. RBIAS
Voltage Reference
A stable and accurate 0.5 V voltage reference is built into the
AD9228. This is gained up by a factor of 2 internally, setting
V
REF
to 1.0 V, which results in a full-scale differential input span
of 2 V p-p. The V
REF
is set internally by default; however, the
VREF pin can be driven externally with a 1.0 V reference to
achieve more accuracy.
When applying the decoupling capacitors to the VREF, REFT,
and REFB pins, use ceramic low ESR capacitors. These capacitors
should be close to the ADC pins and on the same layer of the
PCB as the AD9228. The recommended capacitor values and
configurations for the AD9228 reference pin can be found in
Figure 64.
Table 12. Reference Settings
Selected
Mode
External
Reference
Internal,
2 V p-p FSR
SENSE
Voltage
AVDD
Resulting
VREF (V)
N/A
Resulting
Differential
Span (V p-p)
2 × external
reference
2.0
AGND to 0.2 V
1.0
Internal Reference Operation
A comparator within the AD9228 detects the potential at the
SENSE pin and configures the reference. If SENSE is grounded,
the reference amplifier switch is connected to the internal
resistor divider (see Figure 64), setting VREF to 1 V.
The REFT and REFB pins establish their input span of the ADC
core from the reference configuration. The analog input full-
scale range of the ADC equals twice the voltage at the reference
pin for either an internal or an external reference configuration.
If the reference of the AD9228 is used to drive multiple
converters to improve gain matching, the loading of the refer-
ence by the other converters must be considered. Figure 66
depicts how the internal reference voltage is affected by loading.
1μF
0.1μF
V
REF
SENSE
0.5V
REFT
0.1μF
0.1μF
2.2μF
0.1μF
REFB
SELECT
LOGIC
ADC
CORE
+
0
VIN–
VIN+
Figure 64. Internal Reference Configuration
1μF
0.1μF
V
REF
SENSE
AVDD
0.5V
REFT
0.1μF
0.1μF
2.2μF
0.1μF
REFB
SELECT
LOGIC
ADC
CORE
+
0
VIN–
VIN+
Figure 65. External Reference Operation
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| AD9228_07 | 制造商:AD 制造商全稱:Analog Devices 功能描述:Quad, 12-Bit, 40/65 MSPS Serial LVDS 1.8 V A/D Converter |
| AD9228-65EB | 制造商:Analog Devices 功能描述: |
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| AD9228-65EBZ | 功能描述:BOARD EVAL FOR AD9228 RoHS:是 類別:編程器，開(kāi)發(fā)系統(tǒng) >> 評(píng)估板 - 模數(shù)轉(zhuǎn)換器 (ADC) 系列:- 產(chǎn)品培訓(xùn)模塊:Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:1 系列:- ADC 的數(shù)量:1 位數(shù):12 采樣率（每秒）:94.4k 數(shù)據(jù)接口:USB 輸入范圍:±VREF/2 在以下條件下的電源（標(biāo)準(zhǔn)）:- 工作溫度:-40°C ~ 85°C 已用 IC / 零件:MAX11645 已供物品:板，軟件 |
| AD9228ABCPZ-40 | 功能描述:IC ADC 12BIT SPI/SRL 40M 48LFCSP RoHS:是 類別:集成電路 (IC) >> 數(shù)據(jù)采集 - 模數(shù)轉(zhuǎn)換器 系列:- 其它有關(guān)文件:TSA1204 View All Specifications 標(biāo)準(zhǔn)包裝:1 系列:- 位數(shù):12 采樣率（每秒）:20M 數(shù)據(jù)接口:并聯(lián) 轉(zhuǎn)換器數(shù)目:2 功率耗散（最大）:155mW 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:48-TQFP 供應(yīng)商設(shè)備封裝:48-TQFP（7x7） 包裝:Digi-Reel® 輸入數(shù)目和類型:4 個(gè)單端，單極；2 個(gè)差分，單極 產(chǎn)品目錄頁(yè)面:1156 (CN2011-ZH PDF) 其它名稱:497-5435-6 |
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