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參數(shù)資料
| 型號： | AD9221ARSZ |
| 廠商： | Analog Devices Inc |
| 文件頁數(shù)： | 17/32頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC ADC 12BIT 1.5MSPS 28SSOP |
| 標準包裝： | 47 |
| 位數(shù)： | 12 |
| 采樣率（每秒）： | 1.5M |
| 數(shù)據(jù)接口： | 并聯(lián) |
| 轉換器數(shù)目： | 7 |
| 功率耗散（最大）： | 70mW |
| 電壓電源： | 單電源 |
| 工作溫度： | -40°C ~ 85°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 28-SSOP（0.209"，5.30mm 寬） |
| 供應商設備封裝： | 28-SSOP |
| 包裝： | 管件 |
| 輸入數(shù)目和類型： | 2 個單端，單極；1 個差分，單極 |
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REV. E
–24–
AD9221/AD9223/AD9220
1.25k
0.1 F
10 F
2.5k
+5V
U1
REF43
VREF(+)
VREF(–)
U3
DAC08
IOUT
0.1 F
2.5k
0.1 F
2.5k
0.1 F
2.5k
162
2.5k
RC
100
1.1k
2
39
U2A
1.25V
39mV
U2B
CH1
CH2
CH3
CH4
CH5
CH6
CH7
CH8
U6
ADG608
1.25V
OUT
VREF(+)
VREF(–)
U5
DAC08
IOUT
U4
2.5k
RC
100
39
AD9221/
AD9223/
AD9220
SENSE
VREF
VINA
VINB
BIT 1 – BIT 12
OTR
2.50V
RC
100
2.5k
39
Figure 35. Typical Multichannel Data Acquisition System
The offset calibration circuitry consists of a DAC, U5 and
the buffer amplifier, U4. The DAC is configured for a bipolar
adjustment span of
±64 LSB with a 1/2 LSB resolution span
with respect to the AD9221/AD9223/AD9220. Note that both
current outputs of U5 were configured to provide a bipolar
adjustment span. Also, RC is used to decouple the output of
both DACs, U3 and U5, from their respective op amps.
The calibration procedure consists of a two step process. First,
the bipolar offset is calibrated by selecting CH2, the 2.5 V sys-
tem reference, of the analog multiplexer and preloading the DAC,
U5, with a midscale code of 1000 0000. If possible, several
readings of the A/D should be taken and averaged to determine
the required digital offset adjustment code, U5. This averaged
offset code requires an extra bit of resolution since 1 LSB of U5
equates to 1/2 LSB of the AD9221/AD9223/AD9220. The
required offset correction code to U5 can then be determined.
Second, the system gain is calibrated by selecting CH2, a 1.25 V
input that corresponds to –FS of the A/D. Before the value is
read, U4 should be preloaded with a code of 00 (Hex). Several
readings can also be taken and averaged to determine the digital
gain adjustment code to U2A. In this case, 1 LSB of the A/D
corresponds to 1 LSB of U4.
Due to the AD9221/AD9223/AD9220’s excellent INL perfor-
mance, a two-point calibration procedure (i.e., –FS to midscale)
instead of an endpoint calibration procedure was chosen. Also,
since the bipolar offset is insensitive to any gain adjustment (due
to the differential SHA of the A/D), an iterative calibration
process is not required. The temperature stability of the circuit
is enhanced by selecting a dual precision op amp for U2 (e.g.,
OP293) and low temperature drift, thin film resistors. Note that
this application circuit was not built at the release of this data
sheet. Please consult Analog Devices for application assistance
or comments.
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相關代理商/技術參數(shù) |
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| AD9221ARSZ-REEL | 功能描述:IC ADC 12BIT 1.5MSPS 28SSOP RoHS:是 類別:集成電路 (IC) >> 數(shù)據(jù)采集 - 模數(shù)轉換器 系列:- 標準包裝:1,000 系列:- 位數(shù):12 采樣率（每秒）:300k 數(shù)據(jù)接口:并聯(lián) 轉換器數(shù)目:1 功率耗散（最大）:75mW 電壓電源:單電源 工作溫度:0°C ~ 70°C 安裝類型:表面貼裝 封裝/外殼:24-SOIC（0.295"，7.50mm 寬） 供應商設備封裝:24-SOIC 包裝:帶卷 (TR) 輸入數(shù)目和類型:1 個單端，單極；1 個單端，雙極 |
| AD9221ARZ | 功能描述:IC ADC 12BIT 1.5MSPS 28SOIC RoHS:是 類別:集成電路 (IC) >> 數(shù)據(jù)采集 - 模數(shù)轉換器 系列:- 其它有關文件:TSA1204 View All Specifications 標準包裝: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 供應商設備封裝:48-TQFP（7x7） 包裝:Digi-Reel® 輸入數(shù)目和類型:4 個單端，單極；2 個差分，單極 產品目錄頁面:1156 (CN2011-ZH PDF) 其它名稱:497-5435-6 |
| AD9221ARZ-REEL | 功能描述:IC ADC 12BIT 1.5MSPS 28SOIC RoHS:是 類別:集成電路 (IC) >> 數(shù)據(jù)采集 - 模數(shù)轉換器 系列:- 標準包裝:1,000 系列:- 位數(shù):12 采樣率（每秒）:300k 數(shù)據(jù)接口:并聯(lián) 轉換器數(shù)目:1 功率耗散（最大）:75mW 電壓電源:單電源 工作溫度:0°C ~ 70°C 安裝類型:表面貼裝 封裝/外殼:24-SOIC（0.295"，7.50mm 寬） 供應商設備封裝:24-SOIC 包裝:帶卷 (TR) 輸入數(shù)目和類型:1 個單端，單極；1 個單端，雙極 |
| AD9221-EB | 制造商:Analog Devices 功能描述: 制造商:Analog Devices 功能描述:EVAL KIT FOR COMPLETE 12-BIT 1.5/3.0/10.0MSPS MONOLITHIC A/D - Bulk |
| AD9222 | 制造商:AD 制造商全稱:Analog Devices 功能描述:Octal, 12-Bit, 40/50 MSPS Serial LVDS 1.8 V A/D Converter |
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