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| 型号： | AD7829BRUZ-1 |
| 厂商： | Analog Devices Inc |
| 文件页数： | 4/20页 |
| 文件大小： | 0K |
| 描述： | IC ADC 8BIT 8CH 2MSPS 28-TSSOP |
| 标准包装： | 50 |
| 位数： | 8 |
| 采样率（每秒）： | 2M |
| 数据接口： | 并联 |
| 转换器数目： | 1 |
| 功率耗散（最大）： | 36mW |
| 电压电源： | 单电源 |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 28-TSSOP（0.173"，4.40mm 宽） |
| 供应商设备封装： | 28-TSSOP |
| 包装： | 管件 |
| 输入数目和类型： | 8 个单端，单极 |
AD7829-1
Rev. 0 | Page 12 of 20
VREF
VMID
VIN
R3
R4
R2
R1
V
0V
VIN
0V
2.5V
AD7829-1
2.5V
06
17
9-
0
12
5V
4V
3V
2V
1V
VDD = 5V
INPUT SIGNAL RANGE
FOR VARIOUS VMID
VMID = N/C (1.25V)
VMID = 2.5V
VMID = 3.75V
3V
2V
1V
VDD = 3V
INPUT SIGNAL RANGE
FOR VARIOUS VMID
VMID = N/C (1V)
VMID = 1.5V
VMID = 2V
0
61
79
-01
0
Figure 11. Accommodating Bipolar Signals Using External VMID
R2
VREF
VMID
VIN
EXTERNAL
2.5V
R3
R4
R1
V
0V
VIN
0V
VMID
06
17
9
-01
3
AD7829-1
Figure 9. Analog Input Span Variation with VMID
VMID can be used to remove offsets in a system by applying the
offset to the VMID pin, as shown in
Figure 12. Accommodating Bipolar Signals Using Internal VMID
Figure 10; or it can be used
to accommodate bipolar signals by applying VMID to a level-shifting
NOTE: Although there is a VREF pin from which a voltage
reference of 2.5 V can be sourced, or to which an external
reference can be applied, this does not provide an option of
varying the value of the voltage reference. As stated in the
specifications for the AD7829-1, the input voltage range at this
pin is 2.5 V ± 2%.
driven by an external source, the source can be directly tied to
the level-shifting circuitry (see Figure 11); however, if the internal
VMID, that is, the default value, is being used as an output, it must
be buffered before applying it to the level-shifting circuitry, because
the VMID pin has an impedance of approximately 6 kΩ (see
Analog Input Structure
Figure 13 shows an equivalent circuit of the analog input
structure of the AD7829-1. The two diodes, D1 and D2, provide
ESD protection for the analog inputs. Care must be taken to
ensure that the analog input signal never exceeds the supply
rails by more than 200 mV. This causes these diodes to become
forward biased and start conducting current into the substrate.
20 mA is the maximum current these diodes can conduct
without causing irreversible damage to the part. However, it is
worth noting that a small amount of current (1 mA) conducted
into the substrate due to an overvoltage on an unselected channel
can cause inaccurate conversions on a selected channel.
VIN
VMID
AD7829-1
VMID
VIN
VMID
0
61
79
-0
11
Figure 10. Removing Offsets Using VMID
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| AD7829BRUZ-1REEL7 | 功能描述:IC ADC 8BIT 8CH 2MSPS 28-TSSOP RoHS:是 类别:集成电路 (IC) >> 数据采集 - 模数转换器 系列:- 标准包装:1,000 系列:- 位数:16 采样率（每秒）:45k 数据接口:串行 转换器数目:2 功率耗散（最大）:315mW 电压电源:模拟和数字 工作温度:0°C ~ 70°C 安装类型:表面贴装 封装/外壳:28-SOIC（0.295"，7.50mm 宽） 供应商设备封装:28-SOIC W 包装:带卷 (TR) 输入数目和类型:2 个单端，单极 |
| AD7829BRUZ-REEL | 功能描述:IC ADC 8BIT 8CHAN 2MSPS 28TSSOP RoHS:是 类别:集成电路 (IC) >> 数据采集 - 模数转换器 系列:- 标准包装:1,000 系列:- 位数:16 采样率（每秒）:45k 数据接口:串行 转换器数目:2 功率耗散（最大）:315mW 电压电源:模拟和数字 工作温度:0°C ~ 70°C 安装类型:表面贴装 封装/外壳:28-SOIC（0.295"，7.50mm 宽） 供应商设备封装:28-SOIC W 包装:带卷 (TR) 输入数目和类型:2 个单端，单极 |
| AD7829BRUZ-REEL1 | 制造商:AD 制造商全称:Analog Devices 功能描述:3 V/5 V, 2 MSPS, 8-Bit, 1-/4-/8-Channel Sampling ADCs |
| AD7829BRUZ-REEL7 | 功能描述:IC ADC 8BIT 8CHAN 2MSPS 28TSSOP RoHS:是 类别:集成电路 (IC) >> 数据采集 - 模数转换器 系列:- 标准包装:1,000 系列:- 位数:16 采样率（每秒）:45k 数据接口:串行 转换器数目:2 功率耗散（最大）:315mW 电压电源:模拟和数字 工作温度:0°C ~ 70°C 安装类型:表面贴装 封装/外壳:28-SOIC（0.295"，7.50mm 宽） 供应商设备封装:28-SOIC W 包装:带卷 (TR) 输入数目和类型:2 个单端，单极 |
| AD7829BRUZ-REEL71 | 制造商:AD 制造商全称:Analog Devices 功能描述:3 V/5 V, 2 MSPS, 8-Bit, 1-/4-/8-Channel Sampling ADCs |
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