参数资料
型号: EVAL-AD7321CBZ
厂商: Analog Devices Inc
文件页数: 14/37页
文件大小: 0K
描述: BOARD EVALUATION FOR AD7321
标准包装: 1
系列: iCMOS®
ADC 的数量: 1
位数: 12
采样率(每秒): 500k
数据接口: 串行
输入范围: ±10 V
在以下条件下的电源(标准): 17mW @ 500kSPS
工作温度: -40°C ~ 85°C
已用 IC / 零件: AD7321
已供物品: 板,CD
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AD7321BRUZ-REEL7-ND - IC ADC 12BIT+ SAR 2CHAN 14TSSOP
AD7321BRUZ-ND - IC ADC 12BIT+ SAR 2CHAN 14TSSOP
AD7321
Data Sheet
Rev. B | Page 20 of 36
±16.5V VDD/VSS
±12V VDD/VSS
5
–6
V
CO
M
RANG
E
(
V
)
4
3
2
1
0
–1
–2
–3
–4
–5
VCC = 3V
VREF = 3V
±2.5V
RANGE
±10V
RANGE
±5V RANGE
±2.5V
RANGE
±5V RANGE
±10V
RANGE
05399-
045
Figure 35. Common-Mode Range for VCC = 3 V and REFIN/OUT = 3 V
±16.5V VDD/VSS
±12V VDD/VSS
V
CO
M
RANG
E
(
V
)
VCC = 5V
VREF = 3V
8
–4
6
4
2
0
–2
±2.5V
RANGE
±10V
RANGE
±5V RANGE
±2.5V
RANGE
±5V RANGE
±10V
RANGE
05399-
046
Figure 36. Common-Mode Range for VCC = 5 V and REFIN/OUT = 3 V
6
–8
4
2
0
–2
–4
–6
±16.5V VDD/VSS
±12V VDD/VSS
V
CO
M
RANG
E
(
V
)
VCC = 3V
VREF = 2.5V
±2.5V
RANGE
±10V
RANGE
±5V RANGE
±2.5V
RANGE
±5V RANGE
±10V
RANGE
05399-
047
Figure 37. Common-Mode Range for VCC = 3 V and REFIN/OUT = 2.5 V
8
–8
6
4
2
0
–2
–4
–6
±16.5V VDD/VSS
±12V VDD/VSS
V
CO
M
RANG
E
(
V
)
VCC = 5V
VREF = 2.5V
±2.5V
RANGE
±10V
RANGE
±5V RANGE
±2.5V
RANGE
±5V RANGE
±10V
RANGE
05399-
048
Figure 38. Common-Mode Range for VCC = 5 V and REFIN/OUT = 2.5 V
Pseudo Differential Inputs
The AD7321 can have one pseudo differential pair. 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 a pseudo ground. Pseudo differential inputs separate
the analog input signal ground from the ADC ground, allowing
cancellation of dc common-mode voltages.
When a conversion takes place, the pseudo ground corresponds
to Code 4096, and the maximum amplitude corresponds to
Code +4095.
AD73211
VIN+
V+
V–
VDD
VSS
VCC
5V
1ADDITIONAL PINS OMITTED FOR CLARITY.
VIN
05399-
028
Figure 39. Pseudo Differential Inputs
Figure 40 and Figure 41 show the typical voltage range on the
VIN pin for the different analog input ranges when configured
in the pseudo differential mode.
For example, when the AD7321 is configured to operate in
pseudo differential mode and the ±5 V range is selected with
±16.5 V VDD/VSS supplies and 5 V VCC, the voltage on the VIN
pin can vary from 6.5 V to +6.5 V.
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