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| 型号： | AD7864ASZ-3 |
| 厂商： | Analog Devices Inc |
| 文件页数： | 6/28页 |
| 文件大小： | 0K |
| 描述： | IC ADC 12BIT PAR 520K 4CH 44MQFP |
| 标准包装： | 1 |
| 位数： | 12 |
| 采样率（每秒）： | 520k |
| 数据接口： | 并联 |
| 转换器数目： | 1 |
| 功率耗散（最大）： | 120mW |
| 电压电源： | 模拟和数字 |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 44-QFP |
| 供应商设备封装： | 44-MQFP（10x10） |
| 包装： | 托盘 |
| 输入数目和类型： | 4 个差分，双极 |
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AD7864
Rev. D | Page 14 of 28
Table 6. Ideal Input/Output Code Table for the AD7864-2
Analog Input1
Digital Output Code Transition
+FSR 3/2 LSB2
111...110 to 111...111
+FSR 5/2 LSB
111...101 to 111...110
+FSR 7/2 LSB
111...100 to 111...101
AGND + 5/2 LSB
000...010 to 000...011
AGND + 3/2 LSB
000...001 to 000...010
AGND + 1/2 LSB
000...000 to 000...001
1 FSR is the full-scale range and is 0 V to 2.5 V and 0 V to 5 V for the AD7864-2
with VREF = 2.5 V.
2 1 LSB = FSR/4096 and is 0.61 mV (0 V to 2.5 V) and 1.22 mV (0 V to 5 V) for the
AD7864-2 with VREF = 2.5 V.
AD7864-3
Figure 6 shows the analog input section of the AD7864-3. The
analog input range is ±2.5 V on the VIN1A input. The VIN1B input
can be left unconnected, but if it is connected to a potential,
that potential must be AGND.
T/H
R2
AD7864-3
R1
2.5V
REFERENCE
TO ADC
REFERENCE
CIRCUITRY
TO INTERNAL
COMPARATOR
6k
VIN1B
VIN1A
VREF
01
34
1-
00
6
Figure 6. AD7864-3 Analog Input Structure
For the AD7864-3, R1 = 6 kΩ and R2 = 6 kΩ. As a result, drive
the VIN1A input from a low impedance source. The resistor input
stage is followed by the high input impedance stage of the track-
and-hold amplifier.
The designed code transitions take place midway between
successive integer least significant bit values (that is, 1/2 LSB,
3/2 LSB, 5/2 LSB, and so on). Least significant bit size is given by
the formula 1 LSB = FSR/4096. Output coding is twos comple-
ment binary with 1 LSB = FSR/4096 = 5 V/4096 = 1.22 mV. The
ideal input/ output transfer function for the AD7864-3 is shown
in Table 7.
Table 7. Ideal Input/Output Code Table for the AD7864-3
Analog Input1
Digital Output Code Transition
+FSR/2 3/2 LSB2
011...110 to 011...111
+FSR/2 5/2 LSB
011...101 to 011...110
+FSR/2 7/2 LSB
011...100 to 011...101
AGND + 3/2 LSB
000...001 to 000...010
AGND + 1/2 LSB
000...000 to 000...001
AGND 1/2 LSB
111...111 to 000...000
AGND 3/2 LSB
111...110 to 111...111
FSR/2 + 5/2 LSB
100...010 to 100...011
FSR/2 + 3/2 LSB
100...001 to 100...010
FSR/2 + 1/2 LSB
100...000 to 100...001
1 FSR is the full-scale range and is 5 V, with VREF = 2.5 V.
2 1 LSB = FSR/4096 = 1.22 mV (±2.5 V AD7864-3) with VREF = 2.5 V.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| AD7864ASZ-32 | 制造商:AD 制造商全称:Analog Devices 功能描述:4-Channel, Simultaneous Sampling, High Speed, 12-Bit ADC |
| AD7864ASZ-3REEL | 功能描述:IC ADC 12BIT PAR 520K 4CH 44MQFP 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 |
| AD7864ASZ-3REEL2 | 制造商:AD 制造商全称:Analog Devices 功能描述:4-Channel, Simultaneous Sampling, High Speed, 12-Bit ADC |
| AD7864BS-1 | 制造商:Analog Devices 功能描述:ADC Single SAR 520ksps 12-bit Parallel 44-Pin MQFP 制造商:Analog Devices 功能描述:IC 12-BIT ADC |
| AD7864BS-1REEL | 制造商:Analog Devices 功能描述:ADC Single SAR 520ksps 12-bit Parallel 44-Pin MQFP T/R |
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