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| 型号： | AD7452BRTZ-R2 |
| 厂商： | Analog Devices Inc |
| 文件页数： | 10/29页 |
| 文件大小： | 0K |
| 描述： | IC ADC 12BIT 555KSPS SOT23-8 |
| 标准包装： | 1 |
| 位数： | 12 |
| 采样率（每秒）： | 555k |
| 数据接口： | DSP，MICROWIRE?，QSPI?，串行，SPI? |
| 转换器数目： | 1 |
| 功率耗散（最大）： | 7.25mW |
| 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： | SOT-23-8 |
| 供应商设备封装： | SOT-23-8 |
| 包装： | 标准包装 |
| 输入数目和类型： | 1 个差分，双极 |
| 产品目录页面： | 777 (CN2011-ZH PDF) |
| 其它名称： | AD7452BRTZ-R2DKR |
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AD7452
Rev. B | Page 17 of 28
Op Amp Pair
An op amp pair can be used to directly couple a differential
signal to the AD7452. The circuit configurations shown in
convert a single-ended signal into a differential signal for both a
bipolar and unipolar input signal, respectively.
The voltage applied to Point A sets up the common-mode
voltage. In both diagrams, it is connected in some way to the
reference, but any value in the common-mode range can be
input here to set up the common mode. The AD8022 is a
suitable dual op amp that could be used in this configuration to
provide differential drive to the AD7452.
Care must be taken when choosing the op amp because the
selection depends on the required power supply and the system
performance objectives. The driver circuits in Figure 30 and
Figure 31 are optimized for dc coupling applications that
require optimum distortion performance.
The differential op amp driver circuit in Figure 30 is configured
to convert and level shift a single-ended, ground-referenced
(bipolar) signal to a differential signal centered at the VREF level
of the ADC.
The circuit configuration shown in Figure 31 converts a
unipolar, single-ended signal into a differential signal.
GND
2
× V
REF p-p
EXTERNAL
VREF
VIN+
VIN–
AD7452
VREF
VDD
V+
V–
V+
V–
220
220
27
390
220
20k
10k
220
27
A
0.1
F
03154-
A-
030
Figure 30. Dual Op Amp Circuit to Convert a Single-Ended
Bipolar Signal into a Differential Signal
VREF
2
× V
REF p-p
EXTERNAL
VREF
VIN+
VIN–
AD7452
VREF
VDD
V+
V–
V+
V–
220
220
27
390
10k
220
27
GND
A
0.1
F
03154-
A-
031
Figure 31. Dual Op Amp Circuit to Convert a Single-Ended
Unipolar Signal into a Differential Signal
RF Transformer
In systems that do not need to be dc-coupled, an RF trans-
former with a center tap offers a good solution for generating
differential inputs. Figure 32 shows how a transformer is used
for single-ended-to-differential conversion. It provides the
benefits of operating the ADC in the differential mode without
contributing additional noise and distortion. An RF transformer
also has the benefit of providing electrical isolation between the
signal source and the ADC. A transformer can be used for most
ac applications. The center tap is used to shift the differential
signal to the common-mode level required; in this case, it is
connected to the reference so the common-mode level is the
value of the reference.
EXTERNAL
VREF (2.5 V)
R
C
VIN+
VIN–
AD7452
3.75V
2.5V
1.25V
3.75V
2.5V
1.25V
VREF
R
03154-A
-032
Figure 32. Using an RF Transformer to Generate Differential Inputs
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| AD7452BRTZ-REEL7 | 功能描述:IC ADC 12BIT DIF 555KSPS SOT23-8 RoHS:是 类别:集成电路 (IC) >> 数据采集 - 模数转换器 系列:- 标准包装:2,500 系列:- 位数:16 采样率（每秒）:15 数据接口:MICROWIRE?，串行，SPI? 转换器数目:1 功率耗散（最大）:480µW 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:38-WFQFN 裸露焊盘 供应商设备封装:38-QFN（5x7） 包装:带卷 (TR) 输入数目和类型:16 个单端，双极；8 个差分，双极 配用:DC1011A-C-ND - BOARD DELTA SIGMA ADC LTC2494 |
| AD7453 | 制造商:AD 制造商全称:Analog Devices 功能描述:Pseudo Differential, 555 kSPS, 12-Bit ADC in an 8-Lead SOT-23 |
| AD7453ART-REEL7 | 制造商:Analog Devices 功能描述: |
| AD7453ARTZ-REEL7 | 功能描述:IC ADC 12BIT DFF 600KSPS SOT23-8 RoHS:是 类别:集成电路 (IC) >> 数据采集 - 模数转换器 系列:- 标准包装:2,500 系列:- 位数:16 采样率（每秒）:15 数据接口:MICROWIRE?，串行，SPI? 转换器数目:1 功率耗散（最大）:480µW 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:38-WFQFN 裸露焊盘 供应商设备封装:38-QFN（5x7） 包装:带卷 (TR) 输入数目和类型:16 个单端，双极；8 个差分，双极 配用:DC1011A-C-ND - BOARD DELTA SIGMA ADC LTC2494 |
| AD7453BRT-R2 | 制造商:Analog Devices 功能描述:ADC Single SAR 555ksps 12-bit Serial 8-Pin SOT-23 T/R 制造商:Rochester Electronics LLC 功能描述:12-BIT P/DIFF I/PUT, 600KSPS ADC I.C. - Bulk |
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