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參數(shù)資料
| 型號： | AD7938BSUZ-6 |
| 廠商： | Analog Devices Inc |
| 文件頁數(shù)： | 15/32頁 |
| 文件大小： | 0K |
| 描述： | IC ADC 12BIT 8CHAN 32TQFP |
| 標準包裝： | 1 |
| 位數(shù)： | 12 |
| 采樣率（每秒）： | 625k |
| 數(shù)據(jù)接口： | 并聯(lián) |
| 轉換器數(shù)目： | 1 |
| 功率耗散（最大）： | 7.5mW |
| 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： | 32-TQFP |
| 供應商設備封裝： | 32-TQFP（7x7） |
| 包裝： | 托盤 |
| 輸入數(shù)目和類型： | 8 個單端，單極；4 個差分，單極；4 個偽差分，單極；7 偽差分，單極 |
| 配用： | EVAL-AD7938CBZ-ND - EVAL BOARD FOR AD7938 |
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AD7938-6
Data Sheet
Rev. C | Page 22 of 32
e
d r
en e is 2.5 V.
eference values is
f suitable voltage references from
Table 12. Examples of Suitable Voltage References
Reference
ting
)
For example, if operating in differential mode and the reference
is sourced from VDD, the 0 V to 2 × VREF range cannot be used.
This is because the analog input signal range now extends to 2 ×
VDD, which exceeds maximum rating conditions. In the pseudo
differential modes, the user must ensure that VREF + VIN ≤ VDD
when using the 0 V to VREF range, or when using the 2 × VREF
range that 2 × VREF +VIN ≤ VDD.
In all cases, the sp cifie
efer c
The performance of the part with different r
the analog input span and the common-mode voltage range.
Errors in the reference source result in gain errors in the
AD7938-6 transfer function and add to specified full-scale
errors on the part.
Table 12 lists examples o
Analog Devices that can be used. Figure 34 shows a typical
connection diagram for an external reference.
Output
Initial Accuracy
Opera
Voltage
(% Maximum)
Current (μA
2.5/3
0.04
1000
2.5
0.04
500
8
2.04
0.05
500
Digital Inputs
The digital inputs applied to the AD7938-6 are not limited by
the maximum ratings that limit the analog inputs. Instead, the
digital inputs applied can go to 7 V and are not restricted by the
VDD + 0.3 V limit as on the analog inputs.
Another advantage of the digital inputs not being restricted by
the VDD + 0.3 V limit is the fact that power supply sequencing
issues are avoided. If any of these inputs are applied before VDD,
there is no risk of latch-up as there would be on the analog
inputs if a signal greater than 0.3 V were applied prior to VDD.
VDRIVE Input
The AD7938-6 has a VDRIVE feature. VDRIVE controls the voltage
at which the parallel interface operates. VDRIVE allows the ADC
to easily interface to 3 V and 5 V processors.
For example, if the AD7938-6 is operated with an AVDD of 5 V
and the VDRIVE pin is powered from a 3 V supply, the AD7938-6
has better dynamic performance with a VDD of 5 V while still
being able to interface directly to 3 V processors. Care should
be taken to ensure VDRIVE does not exceed VDD by more than
0.3 V (see the Absolute Maximum Ratings section).
AD7938-6*
1
AD780
NC
8
0
475
1-
0
42
2
+VIN
NC
7
3
GND
6
4
TEMP
5
VREF
O/PSELECT
TRIM
VOUT
NC
2.5V
NC
VDD
NC = NO CONNECT
10nF
0.1F
*ADDITIONAL PINS OMITTED FOR CLARITY.
Figure 34. Typical VREF Connection Diagram
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| AD7938BSUZ-6REEL7 | 功能描述:IC ADC 12BIT 8CHAN 32TQFP 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 |
| AD7938BSUZ-REEL7 | 功能描述:IC ADC 12BIT 8CHAN 32TQFP 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 |
| AD7939 | 制造商:AD 制造商全稱:Analog Devices 功能描述:8-Channel, 1.5 MSPS, 12-Bit and 10-Bit Parallel ADCs with a Sequencer |
| AD7939BCP | 制造商:Analog Devices 功能描述:ADC Single SAR 1.5Msps 10-bit Parallel 32-Pin LFCSP EP |
| AD7939BCP-REEL | 制造商:Analog Devices 功能描述:ADC SGL SAR 1.5MSPS 10-BIT PARALLEL 32LFCSP EP - Tape and Reel |
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