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参数资料
| 型号： | AD7856ARZ |
| 厂商： | Analog Devices Inc |
| 文件页数： | 9/32页 |
| 文件大小： | 0K |
| 描述： | IC ADC 14BIT 8CHAN 5V 24SOIC |
| 标准包装： | 31 |
| 位数： | 14 |
| 采样率（每秒）： | 285k |
| 数据接口： | 8051，QSPI?，串行，SPI? µP |
| 转换器数目： | 2 |
| 功率耗散（最大）： | 89.25mW |
| 电压电源： | 模拟和数字 |
| 工作温度： | -40°C ~ 105°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 W |
| 包装： | 管件 |
| 输入数目和类型： | 8 个单端，单极；4 个伪差分，单极 |
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AD7856
–17–
REV. A
AIN(+)
AIN(–)
AD7856
DOUT
TRACK AND HOLD
AMPLIFIER
STRAIGHT
BINARY
FORMAT
VIN = 0 TO VREF
Figure 14. 0 to VREF Input Configuration
Transfer Function
For the AD7856 input range the designed code transitions occur
midway between successive integer LSB values (i.e., 1/2 LSB,
3/2 LSBs, 5/2 LSBs . . . FS – 3/2 LSBs). The output coding
is straight binary, with 1 LSB = FS/16384 = 4.096 V/16384 =
0.25 mV when VREF = 4.096 V. The ideal input/output transfer
characteristic is shown in Figure 15.
+FS –1LSB
OUTPUT
CODE
0V
111...111
111...110
111...101
111...100
000...011
000...001
000...000
000...010
VIN = (AIN(+) – AIN(–)), INPUT VOLTAGE
1LSB
1LSB =
FS
16384
Figure 15. Transfer Characteristic
REFERENCE SECTION
For specified performance, it is recommended that when using
an external reference this reference should be between 4 V and
the analog supply AVDD. The connections for the relevant refer-
ence pins are shown in the typical connection diagrams. If the
internal reference is being used, the REFIN/REFOUT pin should
have a 100 nF capacitor connected to AGND very close to the
REFIN/REFOUT pin. These connections are shown in Figure 16.
If the internal reference is required for use external to the ADC,
it should be buffered at the REFIN/REFOUT pin and a 100 nF
capacitor connected from this pin to AGND. The typical noise
performance for the internal reference, with 5 V supplies is
150 nV/
√Hz @ 1 kHz and dc noise is 100 V p-p.
REFIN/REFOUT
AD7856
ANALOG
SUPPLY
+5V
AVDD
DVDD
0.01 F
0.1 F
10 F
CREF1
CREF2
0.01 F
0.1 F
10
470nF
Figure 16. Relevant Connections When Using Internal
Reference
The other option is that the REFIN/REFOUT pin be overdriven
by connecting it to an external reference. This is possible due to
the series resistance from the REFIN/REFOUT pin to the internal
reference. This external reference can have a range that includes
AVDD. When using AVDD as the reference source or when an
externally applied reference approaches AVDD, the 100 nF ca-
pacitor from the REFIN/REFOUT pin to AGND should be as
close as possible to the REFIN/REFOUT pin, and also the CREF1
pin should be connected to AVDD to keep this pin at the same
level as the reference. The connections for this arrangement are
shown in Figure 17. When using AVDD it may be necessary to
add a resistor in series with the AVDD supply. This will have the
effect of filtering the noise associated with the AVDD supply.
REFIN/REFOUT
AD7856
ANALOG
SUPPLY
+5V
AVDD
DVDD
0.01 F
0.1 F
10 F
CREF1
CREF2
0.01 F
0.1 F
10
470nF
Figure 17. Relevant Connections When Using AVDD as the
Reference
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相关代理商/技术参数 |
参数描述 |
|---|---|
| AD7856ARZ-REEL7 | 功能描述:IC ADC 14BIT 8CHAN 5V 24SOIC RoHS:是 类别:集成电路 (IC) >> 数据采集 - 模数转换器 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:2,500 系列:- 位数:12 采样率（每秒）:3M 数据接口:- 转换器数目:- 功率耗散（最大）:- 电压电源:- 工作温度:- 安装类型:表面贴装 封装/外壳:SOT-23-6 供应商设备封装:SOT-23-6 包装:带卷 (TR) 输入数目和类型:- |
| AD7856KR | 制造商:Analog Devices 功能描述:ADC Single SAR 285ksps 14-bit Serial 24-Pin SOIC W 制造商:Rochester Electronics LLC 功能描述:8 CH. 14-BIT 300 KSPS ADC I.C. - Bulk |
| AD7856KR-REEL | 功能描述:IC ADC 14BIT 8CH 5V 24-SOIC RoHS:否 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 |
| AD7856KR-REEL7 | 制造商:Analog Devices 功能描述:ADC Single SAR 285ksps 14-bit Serial 24-Pin SOIC W T/R 制造商:Rochester Electronics LLC 功能描述:8 CH. 14-BIT 300 KSPS ADC I.C. - Tape and Reel |
| AD7856KRZ | 功能描述:IC ADC 14BIT 8CHAN 5V 24SOIC 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 |
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