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| 型号： | AD7864BSZ-1REEL |
| 厂商： | Analog Devices Inc |
| 文件页数： | 5/28页 |
| 文件大小： | 0K |
| 描述： | IC ADC 12BIT DUAL 4CHAN 44-MQFP |
| 标准包装： | 800 |
| 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： | 带卷 (TR) |
| 输入数目和类型： | 4 个差分，双极 |
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AD7864
Rev. D | Page 13 of 28
CIRCUIT DESCRIPTION
ANALOG INPUT
Table 5. Ideal Input/Output Code Table for the AD7864-1
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
The AD7864 is offered in three models: the AD7864-1, where
each input can be configured for ±10 V or a ±5 V input voltage
range; the AD7864-3, which handles the input voltage range of
±2.5 V; and the AD7864-2, where each input can be configured
to have a 0 V to +2.5 V or 0 V to +5 V input voltage range.
AD7864-1
Figure 4 shows the analog input section of the AD7864-1. Each
input can be configured for ±5 V or ±10 V operation on the
AD7864-1. For ±5 V (AD7864-1) operation, the VINxA and VINxB
inputs are tied together and the input voltage is applied to both.
For ±10 V (AD7864-1) operation, the VINxB input is tied to AGND
and the input voltage is applied to the VINxA input. The VINxA and
VINxB inputs are symmetrical and fully interchangeable. Thus for
ease of printed circuit board (PCB) layout on the ±10 V range,
the input voltage may be applied to the VINxB input while the
VINxA input is tied to AGND.
1 FSR is full-scale range and is 20 V for the ±10 V range and +10 V for the ±5 V
range, with VREF = 2.5 V.
2 1 LSB = FSR/4096 = 4.883 mV (±10 V for the AD7864-1) and 2.441 mV (±5 V
for the AD7864-1) with VREF = 2.5 V.
AD7864-2
Figure 5 shows the analog input section of the AD7864-2. Each
input can be configured for 0 V to 5 V operation or 0 V to 2.5 V
operation. For 0 V to 5 V operation, the VINxB input is tied to
AGND and the input voltage is applied to the VINxA input. For
0 V to 2.5 V operation, the VINxA and VINxB inputs are tied together
and the input voltage is applied to both. The VINxA and VINxB
inputs are symmetrical and fully interchangeable. Thus for ease
of PCB layout on the 0 V to 5 V range, the input voltage may be
applied to the VINxB input while the VINxA input is tied to AGND.
2.5V
REFERENCE
T/H
TO ADC
REFERENCE
CIRCUITRY
6k
R2
R3
TO INTERNAL
COMPARATOR
AD7864-1
R1
R4
AGND
VIN1B
VIN1A
VREF
01
34
1-
00
4
For the AD7864-2, R1 = 6 kΩ and R2 = 6 kΩ. The designed
code transitions occur on successive integer least significant bit
values. Output coding is straight (natural) binary with 1 LSB =
FSR/4096 = 2.5 V/4096 = 0.61 mV, and 5 V/4096 = 1.22 mV, for
the 0 V to 2.5 V and 0 V to 5 V options, respectively.
Figure 4. AD7864-1 Analog Input Structure
Table 6 shows the ideal input and output transfer function for
the AD7864-2.
For the AD7864-1, R1 = 6 kΩ, R2 = 24 kΩ, R3 = 24 kΩ, and
R4 = 12 kΩ. The resistor input stage is followed by the high
input impedance stage of the track-and-hold amplifier.
2.5V
REFERENCE
T/H
TO ADC
REFERENCE
CIRCUITRY
R2
TO INTERNAL
COMPARATOR
AD7864-2
R1
6k
VIN1B
VIN1A
VREF
0
134
1-
0
05
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 forth). Least significant bit size is given
by the formula 1 LSB = FSR/4096. For the ±5 V range, 1 LSB =
10 V/4096 = 2.44 mV. For the ±10 V range, 1 LSB = 20 V/4096 =
4.88 mV. Output coding is twos complement binary with 1 LSB =
FSR/4096. The ideal input/output transfer function for the
AD7864-1 is shown in Table 5.
Figure 5. AD7864-2 Analog Input Structure
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