参数资料
型号: AD7785BRUZ-REEL
厂商: Analog Devices Inc
文件页数: 3/32页
文件大小: 0K
描述: IC ADC 20BIT 3CH LN LP 16-TSSOP
标准包装: 2,500
位数: 20
采样率(每秒): 470
数据接口: MICROWIRE?,QSPI?,串行,SPI?
转换器数目: 1
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: 16-TSSOP(0.173",4.40mm 宽)
供应商设备封装: 16-TSSOP
包装: 带卷 (TR)
输入数目和类型: 3 个差分,单极;3 个差分,双极
配用: EVAL-AD7785EBZ-ND - BOARD EVALUATION FOR AD7785
AD7785
Rev. 0 | Page 11 of 32
OUTPUT NOISE AND RESOLUTION SPECIFICATIONS
EXTERNAL REFERENCE
Table 5 shows the output rms noise of the AD7785 for some of
the update rates and gain settings. The numbers given are for
the bipolar input range with an external 2.5 V reference. These
numbers are typical and are generated with a differential input
voltage of 0 V. Table 6 shows the effective resolution, with the
output peak-to-peak (p-p) resolution shown in parentheses. It is
important to note that the effective resolution is calculated
using the rms noise, while the p-p resolution is based on the p-p
noise. The p-p resolution represents the resolution for which
there is no code flicker. These numbers are typical and are
rounded to the nearest LSB.
Table 5. Output RMS Noise (μV) vs. Gain and Output Update Rate Using an External 2.5 V Reference
Update Rate (Hz)
Gain of 1
Gain of 2
Gain of 4
Gain of 8
Gain of 16
Gain of 32
Gain of 64
Gain of 128
4.17
0.64
0.6
0.29
0.22
0.1
0.065
0.039
0.041
8.33
1.04
0.96
0.38
0.26
0.13
0.078
0.057
0.055
16.7
1.55
1.45
0.54
0.36
0.18
0.11
0.087
0.086
33.2
2.3
2.13
0.74
0.5
0.23
0.17
0.124
0.118
62
2.95
2.85
0.92
0.58
0.29
0.2
0.153
0.144
123
4.89
4.74
1.49
1
0.48
0.32
0.265
0.283
242
11.76
9.5
4.02
1.96
0.88
0.45
0.379
0.397
470
11.33
9.44
3.07
1.79
0.99
0.63
0.568
0.593
Table 6. Typical Resolution (Bits) vs. Gain and Output Update Rate Using an External 2.5 V Reference
Update Rate (Hz)
Gain of 1
Gain of 2
Gain of 4
Gain of 8
Gain of 16
Gain of 32
Gain of 64
Gain of 128
4.17
20 (20)
20 (19.5)
20 (19)
20 (18.5)
20 (17.5)
8.33
20 (19.5)
20 (19)
20 (18.5)
20 (18)
19.5 (17)
16.7
20 (19)
20 (18)
20 (18.5)
20 (18)
20 (17.5)
19 (16.5)
33.2
20 (18.5)
20 (17.5)
20 (18)
20 (17.5)
20 (18)
20 (17.5)
19 (16.5)
18.5 (16)
62
20 (18)
19.5 (17)
20 (18)
20 (17.5)
19.5 (17)
19 (16.5)
18 (15.5)
123
20 (17.5)
19 (16.5)
19.5 (17)
19 (16.5)
19.5 (17)
19 (16.5)
18 (15.5)
17 (14.5)
242
18.5 (16)
18 (15.5)
18.5 (16)
17.5 (15)
16.5 (14)
470
18.5 (16)
18 (15.5)
18.5 (16)
18 (15.5)
17 (14.5)
16 (13.5)
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