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參數(shù)資料
| 型號(hào)： | AD7874 |
| 廠商： | Analog Devices, Inc. |
| 英文描述： | 4-Channel, 12-Bit Simultaneous Sampling Data Acquisition System(LC2MOS 4通道,12位同時(shí)采樣DAS) |
| 中文描述： | 4通道，12位同時(shí)采樣數(shù)據(jù)采集系統(tǒng)（LC2MOS 4通道，12位同時(shí)采樣DAS）的 |
| 文件頁(yè)數(shù)： | 13/16頁(yè) |
| 文件大小： | 427K |
| 代理商： | AD7874 |
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AD7874
REV. C
–13–
MULT IPLE AD7874s
Figure 18 shows a system where a number of AD7874s can be
configured to handle multiple input channels. T his type of con-
figuration is common in applications such as sonar, radar, etc.
T he AD7874 is specified with maximum and minimum limits on
aperture delay. T his means that the user knows the maximum
difference in the sampling instant between all channels. T his al-
lows the user to maintain relative phase information between the
different channels.
A common read signal from the microprocessor drives the
RD
input of all AD7874s. Each AD7874 is designated a unique ad-
dress selected by the address decoder. T he reference output of
AD7874 number 1 is used to drive the reference input of all
other AD7874s in the circuit shown in Figure 18. One REF
OUT pin can drive several AD7874 REF IN pins. Alternatively,
an external or system reference can be used to drive all REF IN
inputs. A common reference ensures good full-scale tracking be-
tween all channels.
AD7874(1)
AD7874(2)
AD7874(n)
CS
RD
CS
RD
CS
RD
RD
ADDRESS
REF OUT
REF IN
REF IN
ADDRESS
DECODE
V
CH5
V
CH6
V
CH7
V
CH8
V
CH1
V
CH2
V
CH3
V
CH4
V
CHm
V
CHm+1
V
CHm+2
V
CHm+3
Figure 18. Multiple AD7874s in Multichannel System
DAT A ACQUISIT ION BOARD
Figure 20 shows the AD7874 in a data acquisition circuit. T he
corresponding printed circuit board (PCB) layout and silkscreen
are shown in Figures 21 to 23. A 26-contact IDC connector pro-
vides for a microprocessor connection to the board.
A component grid is provided near the analog inputs on the
PCB which may be used to provide antialiasing filters for the
analog input channels or to provide signal conditioning circuitry.
T o facilitate this option, four shorting plugs (labeled LK 1 to
LK 4 on the PCB) are provided on the analog inputs, one plug
per input. If the shorting plug for a particular channel is used,
the input signal connects to the buffer amplifier driving the ana-
log input of the ADC. If the shorting plug is omitted, a wire link
can be used to connect the input signal to the PCB component
grid.
Microprocessor connections to the board are made via a 26-
contact IDC connector, SK T 8, the pinout for which is shown in
Figure 19. T his connector contains all data, control and status
signals of the AD7874 (with the exception of the CLK input
and the
CONVST
input which are provided via SK T 5 and
SK T 7, respectively). It also contains decoded R/
W
and
STRB
inputs which are necessary for T MS32020 interfacing (and also
for 68000 interfacing although pin labels on the 68000 are dif-
ferent). Note that the AD7874
CS
input must be decoded prior
to the AD7874 evaluation board.
SK T 1, SK T 2, SK T 3 and SK T 4 provide the inputs for V
IN1
,
V
IN2
, V
IN3
, V
IN4
respectively. Assuming LK 1 to LK 4 are in
place, these input signals are fed to four buffer amplifiers, IC1,
before being applied to the AD7874. T he use of an external
clock source is optional; there is a shorting plug (LK 5) on the
AD7874 CLK input which must be connected to either –5 V
(for the ADCs own internal clock) or to SK T 5. SK T 6 and
SK T 7 provide the reference and
CONVST
inputs respectively.
Shorting plug LK 6 provides the option of using the external ref-
erence or the ADCs own internal reference.
DB10
DB8
DB6
DB4
DB2
DB0
GND
R/W
RD
CS
1
3
5
7
9
13
15
17
19
25
23
21
11
N/C
N/C
2
4
6
8
10
14
16
18
20
26
24
22
12
DB11
DB9
DB7
DB5
DB3
DB1
GND
STRB
INT
N/C
N/C
N/C
5V
+
5V
+
Figure 19. SKT8, IDC Connector Pinout
POWE R SUPPLY CONNE CT IONS
T he PCB requires two analog power supplies and one 5 V digi-
tal supply. T he analog supplies are labeled V+ and V– and the
range for both supplies is 12 V to 15 V (see silkscreen in Figure
23). Connection to the 5 V digital supply is made via SK T 8.
T he +5 V supply and the –5 V supply required by the AD7874
are generated from voltage regulators (IC3 and IC4) on the V+
and V– supplies.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| AD7874AN | 功能描述:IC DAS 12BIT 4CH LC2MOS 28-DIP RoHS:否 類(lèi)別:集成電路 (IC) >> 數(shù)據(jù)采集 - ADCs/DAC - 專(zhuān)用型 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:50 系列:- 類(lèi)型:數(shù)據(jù)采集系統(tǒng)（DAS） 分辨率（位）:16 b 采樣率（每秒）:21.94k 數(shù)據(jù)接口:MICROWIRE?，QSPI?，串行，SPI? 電壓電源:模擬和數(shù)字 電源電壓:1.8 V ~ 3.6 V 工作溫度:-40°C ~ 85°C 安裝類(lèi)型:表面貼裝 封裝/外殼:40-WFQFN 裸露焊盤(pán) 供應(yīng)商設(shè)備封裝:40-TQFN-EP（6x6） 包裝:托盤(pán) |
| AD7874ANZ | 功能描述:IC DAS 12BIT 4CH LC2MOS 28-DIP RoHS:是 類(lèi)別:集成電路 (IC) >> 數(shù)據(jù)采集 - ADCs/DAC - 專(zhuān)用型 系列:- 產(chǎn)品培訓(xùn)模塊:Data Converter Basics 標(biāo)準(zhǔn)包裝:1 系列:- 類(lèi)型:電機(jī)控制 分辨率（位）:12 b 采樣率（每秒）:1M 數(shù)據(jù)接口:串行，并聯(lián) 電壓電源:單電源 電源電壓:2.7 V ~ 3.6 V，4.5 V ~ 5.5 V 工作溫度:-40°C ~ 85°C 安裝類(lèi)型:表面貼裝 封裝/外殼:100-TQFP 供應(yīng)商設(shè)備封裝:100-TQFP（14x14） 包裝:剪切帶 (CT) 其它名稱(chēng):296-18373-1 |
| AD7874ANZ | 制造商:Analog Devices 功能描述:IC 12-BIT ADC |
| AD7874AQ | 功能描述:IC DAS 12BIT 4CH 5V 28-CDIP RoHS:否 類(lèi)別:集成電路 (IC) >> 數(shù)據(jù)采集 - ADCs/DAC - 專(zhuān)用型 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:50 系列:- 類(lèi)型:數(shù)據(jù)采集系統(tǒng)（DAS） 分辨率（位）:16 b 采樣率（每秒）:21.94k 數(shù)據(jù)接口:MICROWIRE?，QSPI?，串行，SPI? 電壓電源:模擬和數(shù)字 電源電壓:1.8 V ~ 3.6 V 工作溫度:-40°C ~ 85°C 安裝類(lèi)型:表面貼裝 封裝/外殼:40-WFQFN 裸露焊盤(pán) 供應(yīng)商設(shè)備封裝:40-TQFN-EP（6x6） 包裝:托盤(pán) |
| AD7874AR | 功能描述:IC DAS 12BIT 4CH LC2MOS 28-SOIC RoHS:否 類(lèi)別:集成電路 (IC) >> 數(shù)據(jù)采集 - ADCs/DAC - 專(zhuān)用型 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:50 系列:- 類(lèi)型:數(shù)據(jù)采集系統(tǒng)（DAS） 分辨率（位）:16 b 采樣率（每秒）:21.94k 數(shù)據(jù)接口:MICROWIRE?，QSPI?，串行，SPI? 電壓電源:模擬和數(shù)字 電源電壓:1.8 V ~ 3.6 V 工作溫度:-40°C ~ 85°C 安裝類(lèi)型:表面貼裝 封裝/外殼:40-WFQFN 裸露焊盤(pán) 供應(yīng)商設(shè)備封裝:40-TQFN-EP（6x6） 包裝:托盤(pán) |
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