- 您現在的位置：買賣IC網 > PDF目錄373918 > AD7824BQ (ANALOG DEVICES INC) 1.2V, 12 Bit 200KSPS, Serial ADC 6-SOT-23 -40 to 85 PDF資料下載
參數資料
| 型號： | AD7824BQ |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | ADC |
| 英文描述： | 1.2V, 12 Bit 200KSPS, Serial ADC 6-SOT-23 -40 to 85 |
| 中文描述： | 4-CH 8-BIT FLASH METHOD ADC, PARALLEL ACCESS, CDIP24 |
| 封裝： | HERMETIC SEALED, CERDIP-24 |
| 文件頁數： | 6/16頁 |
| 文件大小： | 270K |
| 代理商： | AD7824BQ |
AD7824/AD7828
–6–
REV. F
OPERATIONAL DIAGRAM
The AD7824 is a 4-channel 8-bit ADC and the AD7828 is an
8-channel 8-bit ADC. Operational diagrams for both of these
devices are shown in Figures 3 and 4. The addition of just a 5 V
reference allows the devices to perform the analog-to-digital function.
24
23
22
21
20
19
18
17
16
15
14
13
1
2
3
4
5
6
7
8
9
10
11
12
AD7824
NC = NO CONNECT
AIN4
V
DD
NC
AIN3
AIN2
A0
AIN1
A1
NC
DB7
DB0
DB6
DB1
DB5
DB2
DB4
DB3
CS
RD
RDY
INT
V
REF
(+)
V
REF
(–)
GND
ANALOG INPUTS
0V TO 5V
P 4LSB
DATA BUS
P CONTROL INPUT
STATUS OUTPUT
P ADDRESS
BUS
P 4MSB
DATA BUS
P CONTROL INPUT
STATUS OUTPUT
5V
5V
Figure 3. AD7824 Operational Diagram
28
27
26
25
24
23
22
21
20
19
18
17
16
15
1
2
3
4
5
6
7
8
9
10
11
12
13
14
AD7828
NC = NO CONNECT
AIN6
AIN7
AIN5
AIN8
AIN4
V
DD
A0
AIN3
AIN2
A1
AIN1
A2
NC
DB7
DB0
DB6
DB1
DB5
DB2
DB4
DB3
CS
RD
RDY
INT
V
REF
(+)
V
REF
(–)
GND
ANALOG INPUTS
0V TO 5V
P 4LSB
DATA BUS
P CONTROL INPUT
STATUS OUTPUT
ANALOG INPUTS
0V TO 5V
P ADDRESS
BUS
P 4MSB
DATA BUS
P CONTROL INPUT
STATUS OUTPUT
5V
5V
Figure 4. AD7828 Operational Diagram
CIRCUIT INFORMATION
BASIC DESCRIPTION
The AD7824/AD7828 uses a half-flash conversion technique
whereby two 4-bit flash ADCs are used to achieve an 8-bit result.
Each 4-bit flash ADC contains 15 comparators that compare
the unknown input to a reference ladder to get a 4-bit result.
For a full 8-bit reading to be realized, the upper 4-bit flash, the
most significant (MS) flash, performs a conversion to provide
the four most significant data bits. An internal DAC, driven by
the four MSBs, then recreates an analog approximation of the
input voltage. This analog result is subtracted from the input,
and the difference is converted by the lower flash ADC, the least
significant (LS) flash, to provide the four least significant bits of
the output data. The most significant flash ADC also has one
additional comparator to detect overrange on the analog input.
APPLYING THE AD7824/AD7828
REFERENCE AND INPUT
The two reference inputs on the AD7824/AD7828 are fully differ-
ential and define the zero to full-scale input range of the ADC.
As a result, the span of the analog input voltage for all channels
can easily be varied. By reducing the reference span, V
REF
(+) to
V
REF
(–), to less than 5 V, the sensitivity of the converter can be
increased (e.g., if V
REF
= 2 V then 1 LSB = 7.8 mV). The input/
reference arrangement also facilitates ratiometric operation.
This reference flexibility also allows the input channel voltage
span to be offset from zero. The voltage at V
REF
(–) sets the
input level for all channels, which produces a digital output of
all zeroes. Therefore, although the analog inputs are not them-
selves differential, they have nearly differential input capability
in most measurement applications because of the reference
design. Figures 5 to 7 show some of the configurations that are
possible.
AD7824
*
AD7828
*
AIN1
GND
V
DD
V
REF
(+)
V
REF
(–)
47 F
0.1 F
V
IN
(–)
V
IN
(+)
5V
ADDITIONAL PINS OMITTED FOR CLARITY.
ONLY CHANNEL 1 SHOWN.
*
Figure 5. Power Supply as Reference
AD7824
*
AD7828
*
AIN1
GND
V
DD
V
REF
(+)
V
REF
(–)
47 F
0.1 F
V
IN
(–)
V
IN
(+)
5V
ADDITIONAL PINS OMITTED FOR CLARITY.
ONLY CHANNEL 1 SHOWN.
*
AD580
0.1 F
10 F
Figure 6. External Reference Using the AD580, Full-Scale
Input is 2.5 V
AD7824
*
AD7828
*
AIN1
GND
V
DD
V
REF
(+)
V
REF
(–)
47 F
0.1 F
V
IN
(+)
5V
ADDITIONAL PINS OMITTED FOR CLARITY.
ONLY CHANNEL 1 SHOWN.
*
DB7
DB0
DATA
V1
V2
DATA = V
IN
(+)
Figure 7. Input Not Referenced to GND
相關PDF資料 |
PDF描述 |
|---|---|
| AD7828LRS | LC2MOS High Speed 4- & 8-Channel 8-Bit ADCs |
| AD7834 | 14-Bit Quad DAC(14位四D/A轉換器) |
| AD7835 | 14-Bit Quad DAC(14位四D/A轉換器) |
| AD7837AR | LC2MOS Complete, Dual 12-Bit MDACs |
| AD7837BN | LC2MOS Complete, Dual 12-Bit MDACs |
相關代理商/技術參數 |
參數描述 |
|---|---|
| AD7824BQ/+ | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Single-Ended Data Acquisition System |
| AD7824CQ | 功能描述:IC ADC 8BIT LC2MOS 4CH HS 24CDIP RoHS:否 類別:集成電路 (IC) >> 數據采集 - 模數轉換器 系列:- 標準包裝:1 系列:- 位數:14 采樣率（每秒）:83k 數據接口:串行，并聯 轉換器數目:1 功率耗散（最大）:95mW 電壓電源:雙 ± 工作溫度:0°C ~ 70°C 安裝類型:通孔 封裝/外殼:28-DIP（0.600"，15.24mm） 供應商設備封裝:28-PDIP 包裝:管件 輸入數目和類型:1 個單端，雙極 |
| AD7824CQ/+ | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Single-Ended Data Acquisition System |
| AD7824KCWG | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Single-Ended Data Acquisition System |
| AD7824KN | 功能描述:IC ADC 8BIT LC2MOS 4CH HS 24DIP RoHS:否 類別:集成電路 (IC) >> 數據采集 - 模數轉換器 系列:- 標準包裝:1 系列:- 位數:14 采樣率（每秒）:83k 數據接口:串行，并聯 轉換器數目:1 功率耗散（最大）:95mW 電壓電源:雙 ± 工作溫度:0°C ~ 70°C 安裝類型:通孔 封裝/外殼:28-DIP（0.600"，15.24mm） 供應商設備封裝:28-PDIP 包裝:管件 輸入數目和類型:1 個單端，雙極 |
發布緊急采購，3分鐘左右您將得到回復。