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| 型号： | AD7951BCPZRL |
| 厂商： | Analog Devices Inc |
| 文件页数： | 13/32页 |
| 文件大小： | 0K |
| 描述： | IC ADC 14BIT 1MSPS 48-LFCSP |
| 标准包装： | 2,500 |
| 系列： | PulSAR® |
| 位数： | 14 |
| 采样率（每秒）： | 1M |
| 数据接口： | 串行，并联 |
| 转换器数目： | 1 |
| 功率耗散（最大）： | 260mW |
| 电压电源： | 模拟和数字，双 ± |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 48-VFQFN 裸露焊盘，CSP |
| 供应商设备封装： | 48-LFCSP-VQ（7x7） |
| 包装： | 带卷 (TR) |
| 输入数目和类型： | 1 个差分，双极 |
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AD7951
Data Sheet
Rev. A | Page 20 of 32
ANALOG INPUTS
Input Range Selection
In parallel mode and serial hardware mode, the input range is
selected by using the BIPOLAR (bipolar) and TEN (10 Volt
Configuration section and Software Configuration section for
programming the mode selection with either pins or configuration
register. Note that when using the configuration register, the
BIPOLAR and TEN inputs are don’t cares and should be tied to
either high or low.
Input Structure
Figure 28 shows an equivalent circuit for the input structure of
the AD7951.
D1
RIN
CIN
D2
IN+ OR IN–
VEE
VCC
CPIN
AGND
D3
D4
AVDD
0V TO 5V
RANGE ONLY
0
63
96
-0
28
Figure 28. AD7951 Simplified Analog Input
The four diodes, D1 to D4, provide ESD protection for the analog
inputs, IN+ and IN. Care must be taken to ensure that the analog
input signal never exceeds the supply rails by more than 0.3 V,
because this causes the diodes to become forward-biased and to
start conducting current. These diodes can handle a forward-
biased current of 120 mA maximum. For instance, these conditions
could eventually occur when the input buffer’s U1 supplies are
different from AVDD, VCC, and VEE. In such a case, an input
buffer with a short-circuit current limitation can be used to protect
the part although most op amps’ short circuit current is <100 mA.
Note that D3 and D4 are only used in the 0 V to 5 V range to
allow for additional protection in applications that are switching
from the higher voltage ranges.
This analog input structure allows the sampling of the differential
signal between IN+ and IN. By using this differential input,
small signals common to both inputs are rejected as shown in
Figure 29, which represents the typical CMRR over frequency.
For instance, by using IN to sense a remote signal ground,
ground potential differences between the sensor and the local
ADC ground are eliminated.
100
0
1
10000
FREQUENCY (kHz)
CM
RR
(
d
B
)
90
80
70
60
50
40
30
20
10
100
1000
06
39
6-
0
29
Figure 29. Analog Input CMRR vs. Frequency
During the acquisition phase for ac signals, the impedance of
the analog inputs, IN+ and IN, can be modeled as a parallel
combination of Capacitor CPIN and the network formed by the
series connection of RIN and CIN. CPIN is primarily the pin
capacitance. RIN is typically 70 Ω and is a lumped component
comprised of serial resistors and the on resistance of the switches.
CIN is primarily the ADC sampling capacitor and depending on the
input range selected is typically 48 pF in the 0 V to 5 V range,
typically 24 pF in the 0 V to 10 V and ±5 V ranges and typically
12 pF in the ±10 V range. During the conversion phase, when the
switches are opened, the input impedance is limited to CPIN.
Since the input impedance of the AD7951 is very high, it can be
directly driven by a low impedance source without gain error.
To further improve the noise filtering achieved by the AD7951
analog input circuit, an external, one-pole RC filter between the
amplifier’s outputs and the ADC analog inputs can be used, as
shown in Figure 27. However, large source impedances signifi-
cantly affect the ac performance, especially total harmonic
distortion (THD). The maximum source impedance depends on
the amount of THD that can be tolerated. The THD degrades as
a function of the source impedance and the maximum input
frequency.
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| AD7951BSTZ | 功能描述:IC ADC 14BIT 1MSPS 48-LQFP RoHS:是 类别:集成电路 (IC) >> 数据采集 - 模数转换器 系列:PulSAR® 其它有关文件:TSA1204 View All Specifications 标准包装:1 系列:- 位数:12 采样率（每秒）:20M 数据接口:并联 转换器数目:2 功率耗散（最大）:155mW 电压电源:模拟和数字 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:48-TQFP 供应商设备封装:48-TQFP（7x7） 包装:Digi-Reel® 输入数目和类型:4 个单端，单极；2 个差分，单极 产品目录页面:1156 (CN2011-ZH PDF) 其它名称:497-5435-6 |
| AD7951BSTZRL | 功能描述:IC ADC 14BIT 1MSPS 48-LQFP RoHS:是 类别:集成电路 (IC) >> 数据采集 - 模数转换器 系列:PulSAR® 标准包装:1,000 系列:- 位数:12 采样率（每秒）:300k 数据接口:并联 转换器数目:1 功率耗散（最大）:75mW 电压电源:单电源 工作温度:0°C ~ 70°C 安装类型:表面贴装 封装/外壳:24-SOIC（0.295"，7.50mm 宽） 供应商设备封装:24-SOIC 包装:带卷 (TR) 输入数目和类型:1 个单端，单极；1 个单端，双极 |
| AD7952 | 制造商:AD 制造商全称:Analog Devices 功能描述:14-Bit, 1 MSPS, Differential, Programmable Input PulSAR ADC |
| AD7952BCPZ | 功能描述:IC ADC 14BIT DIFF 1MSPS 48LFCSP RoHS:是 类别:集成电路 (IC) >> 数据采集 - 模数转换器 系列:PulSAR® 标准包装:1,000 系列:- 位数:12 采样率（每秒）:300k 数据接口:并联 转换器数目:1 功率耗散（最大）:75mW 电压电源:单电源 工作温度:0°C ~ 70°C 安装类型:表面贴装 封装/外壳:24-SOIC（0.295"，7.50mm 宽） 供应商设备封装:24-SOIC 包装:带卷 (TR) 输入数目和类型:1 个单端，单极；1 个单端，双极 |
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