參數(shù)資料
型號: AD7785BRUZ
廠商: Analog Devices Inc
文件頁數(shù): 3/32頁
文件大?。?/td> 0K
描述: IC ADC 20BIT SIGMA-DELTA 16TSSOP
標(biāo)準(zhǔn)包裝: 96
位數(shù): 20
采樣率(每秒): 470
數(shù)據(jù)接口: MICROWIRE?,QSPI?,串行,SPI?
轉(zhuǎn)換器數(shù)目: 1
電壓電源: 模擬和數(shù)字
工作溫度: -40°C ~ 105°C
安裝類型: 表面貼裝
封裝/外殼: 16-TSSOP(0.173",4.40mm 寬)
供應(yīng)商設(shè)備封裝: 16-TSSOP
包裝: 管件
輸入數(shù)目和類型: 3 個(gè)差分,單極;3 個(gè)差分,雙極
產(chǎn)品目錄頁面: 779 (CN2011-ZH PDF)
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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