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參數(shù)資料
| 型號(hào)： | AD7266ASU |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | ADC |
| 英文描述： | Differential Input, Dual 2 MSPS, 12-Bit, 3-Channel SAR ADC |
| 中文描述： | DUAL 3-CH 12-BIT SUCCESSIVE APPROXIMATION ADC, SERIAL ACCESS, PQFP32 |
| 封裝： | MS-026ABA, TQFP-32 |
| 文件頁(yè)數(shù)： | 6/17頁(yè) |
| 文件大?。?/td> | 752K |
| 代理商： | AD7266ASU |
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AD7266
Preliminary Technical Data
PIN CONFIGURATION AND FUNCTIONAL DESCRIPTIONS
0
AD7266
TOP VIEW
(Not to Scale)
1
DGND
2
REF SELECT
3
AV
DD
4
D
CAP
A
5
AGND
6
AGND
7
V
A1
8
V
A2
9
V
A
10
V
A
11
V
A
12
V
A
13
V
B
14
V
B
15
V
B
16
V
B
32
D
D
31
V
D
30
D
O
A
29
D
28
D
O
B
27
S
26
C
25
A
24
A1
23
A2
22
SGL/DIFF
21
RANGE
20
D
CAP
B
19
AGND
18
V
B1
17
V
B2
Figure 2. AD7266 Pin Configuration
Table 4. AD7266 Pin Function Descriptions
Pin No.
Mnemonic
4, 20
D
CAP
A,
D
CAP
B
Description
Decoupling capacitors (470nF recommended) are connected to these pins to decouple the reference buffer for
each respective ADC. The on-chip reference can be taken from these pins and applied externally to the rest of a
system. The range of the external reference is dependent on the analog input range selected. See the Reference
Configuration Options section.
Analog Inputs of ADC A. These may be programmed as six single-ended channels or three true differential analog
input channel pairs. See Table 6.
Analog Inputs of ADC B. These may be programmed as six single-ended channels or three true differential analog
input channel pairs. See Table 6.
Serial Clock. Logic Input. A serial clock input provides the SCLK for accessing the data from the AD7266. This clock
is also used as the clock source for the conversion process.
Analog Ground. Ground reference point for all analog circuitry on the AD7266. All analog input signals and any
external reference signal should be referred to this AGND voltage. All three of these AGND pins should connect to
the AGND plane of a system. The AGND and DGND voltages ideally should be at the same potential and must not
be more than 0.3 V apart, even on a transient basis.
Digital Supply Voltage, 2.7 V to 5.25 V. This is the supply voltage for all digital circuitry on the AD7266. The DV
DD
and AV
DD
voltages should ideally be at the same potential and must not be more than 0.3 V apart even on a
transient basis. This supply should be decoupled to DGND.
Logic power supply input. The voltage supplied at this pin determines at what voltage the interface will operate.
This pin should be decoupled to DGND. The voltage at this pin may be different to that at AV
DD
and DV
DD
but
should never exceed either by more than 0.3 V.
Digital Ground. This is the ground reference point for all digital circuitry on the AD7266. Both DGND pins should
connect to the DGND plane of a system. The DGND and AGND voltages should ideally be at the same potential
and must not be more than 0.3 V apart, even on a transient basis.
Analog Supply Voltage, 2.7 V to 5.25 V. This is the only supply voltage for all analog circuitry on the AD7266. The
AV
DD
and DV
DD
voltages should ideally be at the same potential and must not be more than 0.3 V apart, even on a
transient basis. This supply should be decoupled to AGND.
Chip Select. Active low logic input. This input provides the dual function of initiating conversions on the AD7266
and frames the serial data transfer.
Serial Data Outputs. The data output is supplied to this pin as a serial data stream. The bits are clocked out on the
falling edge of the SCLK input and 14 SCLKs are required to access the data. The data appears on both pins
simultaneously from the simultaneous conversions of both ADCs. The data stream consists of two leading zeros
followed by the 12 bits of conversion data. The data is provided MSB first. If CS is held low for 16 SCLK cycles
rather than 14, then two trailing zeros will appear after the 12 bits of data. If CS is held low for a further 16 SCLK
cycles after this on either D
OUT
A or D
OUT
B, the data from the other ADC follows on the D
OUT
pin. This allows data
from a simultaneous conversion on both ADCs to be gathered in serial format on either D
OUT
A or D
OUT
B alone
using only one serial port. See the Serial Interface section.
7–12
V
A1
–V
A6
18–13
V
B1
–V
B6
27
SCLK
5, 6, 19
AGND
32
DV
DD
31
V
DRIVE
1, 29
DGND
3
AV
DD
26
CS
30, 28
D
OUT
A,
D
OUT
B
Rev. PrG | Page 6 of 17
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| AD7266BCPZ | 功能描述:IC ADC 12BIT 3CH 2MSPS 32-LFCSP RoHS:是 類別:集成電路 (IC) >> 數(shù)據(jù)采集 - 模數(shù)轉(zhuǎn)換器 系列:- 標(biāo)準(zhǔn)包裝:1 系列:microPOWER™ 位數(shù):8 采樣率（每秒）:1M 數(shù)據(jù)接口:串行，SPI? 轉(zhuǎn)換器數(shù)目:1 功率耗散（最大）:- 電壓電源:模擬和數(shù)字 工作溫度:-40°C ~ 125°C 安裝類型:表面貼裝 封裝/外殼:24-VFQFN 裸露焊盤 供應(yīng)商設(shè)備封裝:24-VQFN 裸露焊盤（4x4） 包裝:Digi-Reel® 輸入數(shù)目和類型:8 個(gè)單端，單極 產(chǎn)品目錄頁(yè)面:892 (CN2011-ZH PDF) 其它名稱:296-25851-6 |
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