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參數(shù)資料
| 型號： | AD7778ASZ |
| 廠商： | Analog Devices Inc |
| 文件頁數(shù)： | 3/12頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC ADC 10BIT 8CHAN HS 44-MQFP |
| 標(biāo)準(zhǔn)包裝： | 1 |
| 位數(shù)： | 10 |
| 采樣率（每秒）： | 378k |
| 數(shù)據(jù)接口： | 并聯(lián) |
| 轉(zhuǎn)換器數(shù)目： | 1 |
| 電壓電源： | 單電源 |
| 工作溫度： | -40°C ~ 85°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 44-QFP |
| 供應(yīng)商設(shè)備封裝： | 44-MQFP（10x10） |
| 包裝： | 托盤 |
| 輸入數(shù)目和類型： | 8 個(gè)單端，單極 |
AD7776/AD7777/AD7778
–11–
REV. A
RTN is tied to REFOUT, then the analog input range becomes
0 V to 2 V. The fixed 2 V analog input voltage span of the ADC
can range from 1 V to 3 V (RTN = 0 V) to 0 V to 2 V (RTN =
2 V), i.e., with proper biasing, an input signal range from 0.3 V
to 2.3 V can be covered. Both the relative accuracy and differen-
tial nonlinearity performance remain essentially unchanged in
this mode, while the SNR and THD performance are typically
2 dB to 3 dB worse than standard.
Changing the Analog Input Voltage Range
By biasing the RTN pin above AGND, it is possible to change
the analog input voltage range from its VBIAS
± VSWING format to
a more traditional 0 V to VREF range. The new input range can
be described as
VtoV
REFIN
OFFSET
+
()
where 0 V
≤ VOFFSET ≤ 1 V. To produce this range, the RTN pin
must be biased to (REFIN – 2 VOFFSET). For instance, if
OUTLINE DIMENSIONS
24-Lead Standard Small Outline Package [SOIC]
Wide Body
(RW-24)
Dimensions shown in millimeters and (inches)
CONTROLLING DIMENSIONS ARE IN MILLIMETERS; INCH DIMENSIONS
(IN PARENTHESES) ARE ROUNDED-OFF MILLIMETER EQUIVALENTS FOR
REFERENCE ONLY AND ARE NOT APPROPRIATE FOR USE IN DESIGN
COMPLIANT TO JEDEC STANDARDS MS-013AD
0.32 (0.0126)
0.23 (0.0091)
8
0
0.75 (0.0295)
0.25 (0.0098)
45
1.27 (0.0500)
0.40 (0.0157)
SEATING
PLANE
0.30 (0.0118)
0.10 (0.0039)
0.51 (0.020)
0.33 (0.013)
2.65 (0.1043)
2.35 (0.0925)
1.27 (0.0500)
BSC
24
13
12
1
10.65 (0.4193)
10.00 (0.3937)
7.60 (0.2992)
7.40 (0.2913)
15.60 (0.6142)
15.20 (0.5984)
COPLANARITY
0.10
28-Lead Standard Small Outline Package [SOIC]
Wide Body
(RW-28)
Dimensions shown in millimeters and (inches)
CONTROLLING DIMENSIONS ARE IN MILLIMETERS; INCH DIMENSIONS
(IN PARENTHESES) ARE ROUNDED-OFF MILLIMETER EQUIVALENTS FOR
REFERENCE ONLY AND ARE NOT APPROPRIATE FOR USE IN DESIGN
COMPLIANT TO JEDEC STANDARDS MS-013AE
0.32 (0.0126)
0.23 (0.0091)
8
0
0.75 (0.0295)
0.25 (0.0098)
45
1.27 (0.0500)
0.40 (0.0157)
SEATING
PLANE
0.30 (0.0118)
0.10 (0.0039)
0.51 (0.0201)
0.33 (0.0130)
2.65 (0.1043)
2.35 (0.0925)
1.27 (0.0500)
BSC
28
15
14
1
18.10 (0.7126)
17.70 (0.6969)
10.65 (0.4193)
10.00 (0.3937)
7.60 (0.2992)
7.40 (0.2913)
COPLANARITY
0.10
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