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參數(shù)資料
| 型號： | EVAL-AD7329CBZ |
| 廠商： | Analog Devices Inc |
| 文件頁數(shù)： | 16/41頁 |
| 文件大?。?/td> | 0K |
| 描述： | BOARD EVALUATION FOR AD7329CBZ |
| 標(biāo)準(zhǔn)包裝： | 1 |
| 系列： | iCMOS® |
| ADC 的數(shù)量： | 1 |
| 位數(shù)： | 12 |
| 采樣率（每秒）： | 1M |
| 數(shù)據(jù)接口： | 串行 |
| 輸入范圍： | ±10 V |
| 在以下條件下的電源（標(biāo)準(zhǔn)）： | 30mW @ 1MSPS |
| 工作溫度： | -40°C ~ 85°C |
| 已用 IC / 零件： | AD7329 |
| 已供物品： | 板 |
| 相關(guān)產(chǎn)品： | AD7329BRUZ-REEL7-ND - IC ADC 12BIT+SAR 8CHAN 24-TSSOP AD7329BRUZ-REEL-ND - IC ADC 12BIT+SAR 8CHAN 24-TSSOP AD7329BRUZ-ND - IC ADC 12BIT 8CH MUX SPI 24TSSOP |
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AD7329
Data Sheet
Rev. B | Page 22 of 40
Pseudo Differential Inputs
The AD7329 can have four pseudo differential pairs or seven
pseudo differential inputs referenced to a common VIN pin.
The VIN+ inputs are coupled to the signal source and must have
an amplitude within the selected range for that channel, as
programmed in the range register. A dc input is applied to the
VIN pin. The voltage applied to this input provides an offset for
the VIN+ input from ground or pseudo ground. Pseudo differential
inputs separate the analog input signal ground from the ADC
ground, allowing cancellation of dc common-mode voltages.
Figure 42 shows the configuration of the AD7329 in pseudo
differential mode.
When a conversion takes place, the pseudo ground corresponds
to Code 4096 and the maximum amplitude corresponds to
Code +4095.
AD73291
VIN+
V+
V–
VDD
VSS
VCC
5V
1ADDITIONAL PINS OMITTED FOR CLARITY.
VIN–
05402-
039
Figure 42. Pseudo Differential Inputs
Figure 43 and Figure 44 show the typical voltage range on the
VIN pin for various analog input ranges when configured in
the pseudo differential mode.
For example, when the AD7329 is configured to operate in
pseudo differential mode and the ±5 V range is selected with
16.5 V VDD, 16.5 V VSS, and 5 V VCC, the voltage on the VIN
pin can vary from 6.5 V to +6.5 V.
05402-
040
8
–8
6
4
2
0
–2
–4
–6
±2.5V
RANGE
±10V
RANGE
±10V
RANGE
±5V RANGE
±2.5V
RANGE
±5V RANGE
0V TO +10V
RANGE
0V TO +10V
RANGE
±16.5V VDD/VSS
±12V VDD/VSS
VCC = 5V
VREF = 2.5V
Figure 43. Pseudo Differential Input Range with VCC = 5 V
05402-
041
±2.5V
RANGE
±10V
RANGE
±10V
RANGE
±5V RANGE
±2.5V
RANGE
±5V RANGE
0V TO +10V
RANGE
0V TO +10V
RANGE
±16.5V VDD/VSS
±12V VDD/VSS
4
–8
2
0
–2
–4
–6
VCC = 3V
VREF = 2.5V
Figure 44. Pseudo Differential Input Range with VCC = 3 V
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