参数资料
| 型号： | AD872AJD |
| 厂商： | Analog Devices Inc |
| 文件页数： | 4/20页 |
| 文件大小： | 0K |
| 描述： | IC ADC 12BIT 10MSPS 28-CDIP |
| 标准包装： | 1 |
| 位数： | 12 |
| 采样率（每秒）： | 10M |
| 数据接口： | 并联 |
| 转换器数目： | 7 |
| 功率耗散（最大）： | 1.3W |
| 电压电源： | 模拟和数字，双 ± |
| 工作温度： | 0°C ~ 70°C |
| 安装类型： | 通孔 |
| 封装/外壳： | 28-CDIP（0.605"，15.37mm） |
| 供应商设备封装： | 28-CDIP |
| 包装： | 管件 |
| 输入数目和类型： | 2 个单端，双极；1 个差分，双极 |
REV. A
–12–
AD872A
REF IN
REF GND
AD872A
+5V REF
2k
3.9k
R
RT
2.5V
5k
Figure 21. Optional +5 V Reference Input Circuit
REFERENCE GROUND
The REF GND pin provides the reference point for both the
reference input, and the reference output. When the internal
reference is operating, it will draw approximately 500
A of cur-
rent through the reference ground, so a low impedance path to
the external common is desirable. The AD872A can tolerate a
fairly large difference between REF GND and AGND, up to
+1 V, without any performance degradation.
REFERENCE OUTPUT
The AD872A features an onboard, curvature compensated
bandgap reference that has been laser trimmed for both absolute
value and temperature drift. The output stage of the reference
was designed to allow the use of an external capacitor to limit
the wideband noise. As Figure 22 illustrates, a 1
F capacitor on
the reference output is required for stability of the reference output
buffer. Note: If used, an external reference may become unstable
with this capacitor in place.
REF IN
REF GND
AD872A
0.1 F
REF OUT
+
1.0 F
Figure 22. Typical Reference Decoupling Connection
With this capacitor in place, the noise on the reference output is
approximately 28
V rms at room temperature. Figure 23 shows
the typical temperature drift performance of the reference, while
Figure 24 illustrates the variation in reference voltage with load
currents.
The output stage is designed to provide at least 2 mA of out-
put current, allowing a single reference to drive up to four
AD872As, or other external loads. The power supply rejection
of the reference is better than –54 dB at dc.
2.55
2.45
125
2.48
2.46
–35
2.47
–55
2.51
2.49
2.50
2.52
2.53
2.54
105
85
65
45
25
5
–15
TEMPERATURE – C
REFERENCE
VOLTAGE
–
Volts
Figure 23. Reference Output Voltage vs. Temperature
2.50
2.40
1M
2.46
2.42
10k
2.44
1k
2.48
100k
REFERENCE OUTPUT LOAD –
REFERENCE
VOLTAGE
–
V
Figure 24. Reference Output Voltage vs. Output Load
DIGITAL OUTPUTS
In 28-lead packages, the AD872A output data is presented in
twos complement format. Table III indicates offset binary and
twos complement output for various analog inputs.
Table III. Output Data Format
Analog Input
Digital Output
VINA–VINB
Offset Binary
Twos Complement OTR
≥0.999756 V
1111 1111 1111
0111 1111 1111
1
0.999268 V
1111 1111 1111
0111 1111 1111
0
0 V
1000 0000 0000
0000 0000 0000
0
–1 V
0000 0000 0000
1000 0000 0000
0
–1.000244 V
0000 0000 0000
1000 0000 0000
1
Users requiring offset binary encoding may simply invert the
MSB pin. In the 44-terminal surface mount packages, both
MSB and
MSB bits are provided.
The AD872A features a digital out-of-range (OTR) bit that goes
high when the input exceeds positive full scale or falls below
negative full scale. As Table III indicates, the output bits will be
set appropriately according to whether it is an out-of-range high
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相关代理商/技术参数 |
参数描述 |
|---|---|
| AD872AJE | 制造商:Rochester Electronics LLC 功能描述:IC, 12-BIT 10 MSPS ADC - Bulk |
| AD872ASD | 制造商:AD 制造商全称:Analog Devices 功能描述:Complete 12-Bit 10 MSPS Monolithic A/D Converter |
| AD872ASD/883B | 制造商:Analog Devices 功能描述:ADC Single Pipelined 10Msps 12-bit Parallel 28-Pin CDIP 制造商:Analog Devices 功能描述:ADC SGL PIPELINED 10MSPS 12-BIT PARALLEL 28CDIP - Rail/Tube 制造商:Rochester Electronics LLC 功能描述:IC, 12-BIT 10 MSPS ADC - Bulk 制造商:Analog Devices 功能描述:CONVERTER - ADC |
| AD872ASE | 制造商:AD 制造商全称:Analog Devices 功能描述:Complete 12-Bit 10 MSPS Monolithic A/D Converter |
| AD872ASE/883B | 制造商:Analog Devices 功能描述:ADC Single Pipelined 10Msps 12-bit Parallel 44-Pin LCC 制造商:Rochester Electronics LLC 功能描述:IC, 12-BIT 10 MSPS ADC - Bulk |
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