参数资料
型号: AD7322BRUZ-REEL
厂商: Analog Devices Inc
文件页数: 13/37页
文件大小: 0K
描述: IC ADC 12BIT+SAR 2CHAN 14-TSSOP
标准包装: 2,500
位数: 12
采样率(每秒): 1M
数据接口: DSP,MICROWIRE?,QSPI?,串行,SPI?
转换器数目: 1
功率耗散(最大): 30mW
电压电源: 双 ±
工作温度: -40°C ~ 85°C
安装类型: 表面贴装
封装/外壳: 14-TSSOP(0.173",4.40mm 宽)
供应商设备封装: 14-TSSOP
包装: 带卷 (TR)
输入数目和类型: 2 个单端,单极;2 个单端,双极;1 个差分,单极;1 个差分,双极
配用: EVAL-AD7322CBZ-ND - BOARD EVALUATION FOR AD7322
Data Sheet
AD7322
Rev. B | Page 19 of 36
When a conversion takes place, the common mode is rejected,
resulting in a noise-free signal of amplitude 2 × (4 × VREF) to
+2 × (4 × VREF), corresponding to Digital Code 4096 to
Digital Code +4095.
±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
04863-
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
04863-
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
04863-
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
04863-
048
Figure 38. Common-Mode Range for VCC = 5 V and REFIN/OUT = 2.5 V
Pseudo Differential Inputs
The AD7322 can have one pseudo differential pair. The VIN+
input is 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 input. 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. Figure 39 shows the
AD7322 configured in pseudo differential mode.
When a conversion takes place, the pseudo ground corresponds
to Code 4096 and the maximum amplitude corresponds to
Code +4095.
AD73221
VIN+
V+
V–
VDD
VSS
VCC
5V
VIN
04863-
028
1ADDITIONAL PINS OMITTED FOR CLARITY.
NOTES
1. VIN+ REFERS TO VIN0 AND VIN– REFERS TO VIN1.
Figure 39. Pseudo Differential Inputs
Figure 40 and Figure 41 show the typical voltage range on the
VIN input for the different analog input ranges when
configured in the pseudo differential mode.
For example, when the AD7322 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
input can vary from 6.5 V to +6.5 V.
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