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| 型号： | AD7864ASZ-2 |
| 厂商： | Analog Devices Inc |
| 文件页数： | 13/28页 |
| 文件大小： | 0K |
| 描述： | IC ADC 12BIT PAR 520K 4CH 44MQFP |
| 标准包装： | 1 |
| 位数： | 12 |
| 采样率（每秒）： | 520k |
| 数据接口： | 并联 |
| 转换器数目： | 1 |
| 功率耗散（最大）： | 120mW |
| 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： | 44-QFP |
| 供应商设备封装： | 44-MQFP（10x10） |
| 包装： | 托盘 |
| 输入数目和类型： | 4 个差分，单极 |
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AD7864
Rev. D | Page 20 of 28
OFFSET AND FULL-SCALE ADJUSTMENT
In most digital signal processing (DSP) applications, offset and
full-scale errors have little or no effect on system performance.
Offset error can always be eliminated in the analog domain by
ac coupling. Full-scale error effect is linear and does not cause
problems as long as the input signal is within the full dynamic
range of the ADC. Invariably, some applications require that the
input signal spans the full analog input dynamic range. In such
applications, offset and full-scale error have to be adjusted to zero.
Figure 15 shows a circuit that can be used to adjust the offset
and full-scale errors on the AD7864 (VINxA on the AD7864-1
version is shown for example purposes only). Where adjustment
is required, offset error must be adjusted before full-scale error.
This is achieved by trimming the offset of the op amp driving
the analog input of the AD7864 while the input voltage is 1/2
LSB below analog ground. The trim procedure is as follows:
adjust the op amp offset voltage until the ADC output code
flickers between 1111 1111 1111 and 0000 0000 0000.
Adjust gain error at either the first code transition (ADC
negative full scale) or the last code transition (ADC positive full
scale). The trim procedures for both cases are as follows.
POSITIVE FULL-SCALE ADJUST
Apply a voltage of 9.9927 V (FS 3/2 LSB) at V1 and adjust R2
until the ADC output code flickers between 0111 1111 1110 and
0111 1111 1111.
NEGATIVE FULL-SCALE ADJUST
Apply a voltage of 9.9976 V (FS + 1/2 LSB) at V1 and adjust
R2 until the ADC output code flickers between 1000 0000 0000
and 1000 0000 0001.
An alternative scheme for adjusting full-scale error in systems
that use an external reference is to adjust the voltage at the VREF
pin until the full-scale error for any of the channels is adjusted
out. Good full-scale matching of the channels ensures small
full-scale errors on the other channels.
V1
R1
10k
R2
500
R3
10k
AGND
AD7864-1*
*ADDITIONAL PINS OMITTED FOR CLARITY.
INPUT
RANGE = ±10V
10k
R5
10k
R4
VINxA
01
34
1-
0
15
Figure 15. Full-Scale Adjust Circuit
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相关代理商/技术参数 |
参数描述 |
|---|---|
| AD7864ASZ-22 | 制造商:AD 制造商全称:Analog Devices 功能描述:4-Channel, Simultaneous Sampling, High Speed, 12-Bit ADC |
| AD7864ASZ-2REEL | 功能描述:IC ADC 12BIT PAR 520K 4CH 44MQFP 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: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 |
| AD7864ASZ-2REEL2 | 制造商:AD 制造商全称:Analog Devices 功能描述:4-Channel, Simultaneous Sampling, High Speed, 12-Bit ADC |
| AD7864ASZ-3 | 功能描述:IC ADC 12BIT PAR 520K 4CH 44MQFP RoHS:是 类别:集成电路 (IC) >> 数据采集 - 模数转换器 系列:- 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 |
| AD7864ASZ-32 | 制造商:AD 制造商全称:Analog Devices 功能描述:4-Channel, Simultaneous Sampling, High Speed, 12-Bit ADC |
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