参数资料
型号: EVAL-AD7682EDZ
厂商: Analog Devices Inc
文件页数: 9/32页
文件大小: 0K
描述: BOARD EVAL AD7682
标准包装: 1
系列: PulSAR®
ADC 的数量: 1
位数: 16
采样率(每秒): 250k
数据接口: 串行
输入范围: ±VREF
在以下条件下的电源(标准): 12.5mW @ 250kSPS,5V
工作温度: -40°C ~ 85°C
已用 IC / 零件: AD7682
已供物品:
Data Sheet
AD7682/AD7689
Rev. D | Page 17 of 32
TRANSFER FUNCTIONS
With the inputs configured for unipolar range (single-ended,
COM with ground sense, or paired differentially with INx as
ground sense), the data output is straight binary.
With the inputs configured for bipolar range (COM = VREF/2 or
paired differentially with INx = VREF/2), the data outputs are
twos complement.
The ideal transfer characteristic for the AD7682/AD7689 is
shown in Figure 25 and for both unipolar and bipolar ranges
with the internal 4.096 V reference.
100...000
100...001
100...010
011...101
011...110
011...111
TWOS
COMPLEMENT
STRAIGHT
BINARY
000...000
000...001
000...010
111...101
111...110
111...111
A
DC
CO
DE
ANALOG INPUT
+FSR – 1.5LSB
+FSR – 1LSB
–FSR + 1LSB
–FSR
–FSR + 0.5LSB
07353-
027
Figure 25. ADC Ideal Transfer Function
Table 8. Output Codes and Ideal Input Voltages
Description
FSR 1 LSB
Midscale + 1 LSB
2.048063 V
0x8001
62.5 μV
0x0001
Midscale
2.048 V
0x8000
0 V
0x0000
Midscale 1 LSB
2.047938 V
0x7FFF
62.5 μV
0xFFFF
FSR + 1 LSB
62.5 μV
0x0001
2.047938 V
0x8001
FSR
0 V
2.048 V
0x80004
1 With COM or INx = 0 V or all INx referenced to GND.
2 With COM or INx = VREF /2.
3 This is also the code for an overranged analog input ((INx+) (INx), or COM, above VREF GND).
4 This is also the code for an underranged analog input ((INx+) (INx), or COM, below GND).
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