- 您现在的位置：买卖IC网 > PDF目录10571 > AD7452BRTZ-R2 (Analog Devices Inc)IC ADC 12BIT 555KSPS SOT23-8 PDF资料下载
参数资料
| 型号： | AD7452BRTZ-R2 |
| 厂商： | Analog Devices Inc |
| 文件页数： | 8/29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 |
第1页第2页第3页第4页第5页第6页第7页当前第8页第9页第10页第11页第12页第13页第14页第15页第16页第17页第18页第19页第20页第21页第22页第23页第24页第25页第26页第27页第28页第29页
AD7452
Rev. B | Page 15 of 28
different values of VREF for VDD = 5 V. It also gives the maximum
and minimum common-mode voltages for each reference value
according to Figure 23.
COMMON-MODE (CM)
CMMIN = 1V
CMMAX = 4V
2V p-p
VIN–
VIN+
REFERENCE = 2V
COMMON-MODE (CM)
CMMIN = 1.25V
CMMAX = 3.75V
2.5V p-p
VIN–
VIN+
REFERENCE = 2.5V
03154-A
-025
Figure 25. Examples of the Analog Inputs to VIN+ and VIN– for
Different Values of VREF for VDD = 5 V
Analog Input Structure
Figure 26 shows the equivalent circuit of the analog input
structure of the AD7452. The four diodes provide ESD
protection for the analog inputs. Care must be taken to ensure
that the analog input signals never exceed the supply rails by
more than 300 mV. This causes these diodes to become
forward-biased and start conducting into the substrate. These
diodes can conduct up to 10 mA without causing irreversible
damage to the part. The capacitors, C1 in Figure 26, are typically
4 pF and can primarily be attributed to pin capacitance. The
resistors are lumped components made up of the on resistance
of the switches. The value of these resistors is typically about
100 . The capacitors C2 are the ADC’s sampling capacitors
and have a typical capacitance of 16 pF.
C1
C2
R1
D
C1
C2
R1
D
VDD
03154-A
-026
VIN+
VIN–
Figure 26. Equivalent Analog Input Circuit
Conversion Phase—Switches Open; Track Phase—Switches Closed
For ac applications, removing high frequency components from
the analog input signal through the use of an RC low-pass filter
on the relevant analog input pins is recommended. In applica-
tions where harmonic distortion and signal-to-noise ratio are
critical, the analog input should be driven from a low imped-
ance source. Large source impedances significantly affect the ac
performance of the ADC. This may necessitate the use of an
input buffer amplifier. The choice of the op amp is a function of
the particular application.
When no amplifier is used to drive the analog input, the source
impedance should be limited to low values. The maximum
source impedance depends on the amount of total harmonic
distortion (THD) that can be tolerated. The THD increases as
the source impedance increases, and performance degrades.
Figure 27 shows a graph of the THD versus the analog input
signal frequency for different source impedances for VDD = 5 V.
INPUT FREQUENCY (kHz)
10
100
THD
(dB)
–40
–60
–100
277
–20
0
TA = 25°C
VDD = 5V
RIN = 510
RIN = 1k
RIN = 10
RIN = 300
–80
03154-A
-027
Figure 27. THD vs. Analog Input Frequency for Various
Source Impedances for VDD = 5 V
Figure 28 shows a graph of the THD versus the analog input
frequency for VDD of 5 V ± 5% and 3 V +20%/–10%, while
sampling at 555 kSPS with an SCLK of 10 MHz. In this case, the
source impedance is 10 .
10
100
THD
(dB)
–60
–65
–90
277
–55
–50
TA = 25°C
VDD = 4.75V
–70
VDD = 5.25V
VDD = 3.6V
VDD = 2.7V
–75
–80
–85
INPUT FREQUENCY (kHz)
03154-A
-028
Figure 28. THD vs. Analog Input Frequency for 3 V and 5 V Supply Voltages
相关PDF资料 |
PDF描述 |
|---|---|
| PX0921/04/S | CONN RCPT 4POS W/SOCKET |
| VE-JT4-MW-F3 | CONVERTER MOD DC/DC 48V 100W |
| SP3245ECY-L | IC TXRX RS233 28TSSOP |
| VE-JVY-MY-F4 | CONVERTER MOD DC/DC 3.3V 33W |
| VE-JT4-MW-F1 | CONVERTER MOD DC/DC 48V 100W |
相关代理商/技术参数 |
参数描述 |
|---|---|
| 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 |
发布紧急采购，3分钟左右您将得到回复。