参数资料
| 型号： | AD7927BRU |
| 厂商： | Analog Devices Inc |
| 文件页数： | 8/28页 |
| 文件大小： | 0K |
| 描述： | IC ADC 12BIT 8CH 200KSPS 20TSSOP |
| 标准包装： | 75 |
| 位数： | 12 |
| 采样率（每秒）： | 200k |
| 数据接口： | DSP，MICROWIRE?，QSPI?，串行，SPI? |
| 转换器数目： | 1 |
| 功率耗散（最大）： | 7.5mW |
| 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： | 20-TSSOP（0.173"，4.40mm 宽） |
| 供应商设备封装： | 20-TSSOP |
| 包装： | 管件 |
| 输入数目和类型： | 8 个单端，单极 |
| 配用： | EVAL-AD7927CBZ-ND - BOARD EVALUATION FOR AD7927 |
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
AD7927
Data Sheet
Rev. D | Page 16 of 28
For ac applications, removing high frequency components from
the analog input signal is recommended by use of an RC low-
pass filter on the relevant analog input pin. In applications where
harmonic distortion and signal-to-noise ratio are critical, the
analog input should be driven from a low impedance 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, limit
the source impedance to low values. The maximum source
impedance depends on the amount of THD that can be
tolerated. The THD increases as the source impedance
increases, and performance degrades (see Figure 8).
R1
D1
D2
AVDD
VIN
C2
30pF
C1
4pF
CONVERSION PHASE: SWITCH OPEN
TRACK PHASE: SWITCH CLOSED
03
08
8-
01
6
Figure 16. Equivalent Analog Input Circuit
ADC TRANSFER FUNCTION
The output coding of the AD7927 is either straight binary
or twos complement, depending on the status of the LSB in
the control register. The designed code transitions occur at
successive LSB values (that is, 1 LSB, 2 LSBs, and so forth).
The LSB size is REFIN/4096 for the AD7927. The ideal transfer
characteristic for the AD7927 when straight binary coding is
selected is shown in Figure 17, and the ideal transfer characteristic
for the AD7927 when twos complement coding is selected is
shown in Figure 18.
000…000
0V
ANALOG INPUT
111…111
000…001
000…010
111…110
111…000
011…111
1LSB
1LSB = VREF/4096
+VREF – 1LSB
NOTES
VREF IS EITHER REFIN OR 2 × REFIN.
03
08
8-
0
17
Figure 17. Straight Binary Transfer Characteristic
A
DC
CO
DE
ANALOG INPUT
100…000
011…111
100…001
100…010
011…110
000…001
111…111
000…000
1LSB = 2 × VREF/4096
+VREF – 1LSB
–VREF + 1LSB
VREF – 1LSB
03
08
8-
01
8
Figure 18. Twos Complement Transfer Characteristic with REFIN ± REFIN
Input Range
HANDLING BIPOLAR INPUT SIGNALS
Figure 19 shows how useful the combination of the 2 × REFIN
input range and the twos complement output coding scheme
is for handling bipolar input signals. If the bipolar input signal
is biased about REFIN and twos complement output coding is
selected, then REFIN becomes the zero code point, REFIN is
negative full scale and +REFIN becomes positive full scale, with
a dynamic range of 2 × REFIN.
R3
R2
R4
AD7927
V
DOUT
011…111
000…000
100…000
(= 0V)
0V
V
VREF
0.1F
R1
R1 = R2 = R3 = R4
AVDD
REFIN
VIN0
VIN7
VDRIVE
TWOS
COMPLEMENT
VDD
DSP/
MICROPROCESSOR
+REFIN
REFIN
–REFIN
(= 2 × REFIN)
03
08
8-
0
19
Figure 19. Handling Bipolar Signals
相关PDF资料 |
PDF描述 |
|---|---|
| AD7934BRUZ | IC ADC 12BIT 4CH 1.5MSPS 28TSSOP |
| AD7938BCPZ-6 | IC ADC 12BIT 8CH 625KSPS 32LFCSP |
| AD7938BCPZ | IC ADC 12BIT 8CH 1.5MSPS 32LFCSP |
| AD7940BRM | IC ADC 14BIT UNIPOLAR 8-MSOP |
| AD7942BRMZ-RL7 | IC ADC 14BIT 250KSPS 10-MSOP |
相关代理商/技术参数 |
参数描述 |
|---|---|
| AD7927BRU-REEL | 制造商:Analog Devices 功能描述:ADC Single SAR 200ksps 12-bit Serial 20-Pin TSSOP T/R 制造商:Analog Devices 功能描述:ADC SGL SAR 200KSPS 12-BIT SERL 20TSSOP - Tape and Reel |
| AD7927BRU-REEL7 | 制造商:Analog Devices 功能描述:ADC Single SAR 200ksps 12-bit Serial 20-Pin TSSOP T/R |
| AD7927BRUZ | 功能描述:IC ADC 12BIT 8CH 200KSPS 20TSSOP 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 系列:microPOWER™ 位数:8 采样率（每秒）:1M 数据接口:串行，SPI? 转换器数目:1 功率耗散（最大）:- 电压电源:模拟和数字 工作温度:-40°C ~ 125°C 安装类型:表面贴装 封装/外壳:24-VFQFN 裸露焊盘 供应商设备封装:24-VQFN 裸露焊盘（4x4） 包装:Digi-Reel® 输入数目和类型:8 个单端，单极 产品目录页面:892 (CN2011-ZH PDF) 其它名称:296-25851-6 |
| AD7927BRUZ | 制造商:Analog Devices 功能描述:IC 12BIT ADC SMD 7927 TSSOP20 |
| AD7927BRUZ-REEL | 功能描述:IC ADC 12BIT 8CH W/SEQ 20TSSOP 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 |
发布紧急采购，3分钟左右您将得到回复。