AD7874BQ

更新时间： 2024-01-28 06:36:27

品牌	Logo	应用领域
亚德诺 - ADI		转换器信息通信管理
页数	文件大小	规格书
16页	417K
描述
LC2MOS 4-Channel, 12-Bit Simultaneous Sampling Data Acquisition System

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AD7874BQ 技术参数

Source Url Status Check Date：	2013-05-01 14:56:21.354	是否无铅：	含铅
是否Rohs认证：	不符合	生命周期：	Active
零件包装代码：	DIP	包装说明：	DIP, DIP28,.6
针数：	28	Reach Compliance Code：	not_compliant
ECCN代码：	EAR99	HTS代码：	8542.39.00.01
风险等级：	1.54	Is Samacsys：	N
最大模拟输入电压：	15 V	最小模拟输入电压：	10 V
最长转换时间：	35 µs	转换器类型：	ADC, SUCCESSIVE APPROXIMATION
JESD-30 代码：	R-GDIP-T28	JESD-609代码：	e0
长度：	37.84 mm	最大线性误差 (EL)：	0.024%
标称负供电电压：	-5 V	模拟输入通道数量：	4
位数：	12	功能数量：	1
端子数量：	28	最高工作温度：	125 °C
最低工作温度：	-55 °C	输出位码：	2'S COMPLEMENT BINARY
封装主体材料：	CERAMIC, GLASS-SEALED	封装代码：	DIP
封装等效代码：	DIP28,.6	封装形状：	RECTANGULAR
封装形式：	IN-LINE	峰值回流温度（摄氏度）：	NOT APPLICABLE
电源：	+-5 V	认证状态：	Not Qualified
采样速率：	0.029 MHz	采样并保持/跟踪并保持：	TRACK
筛选级别：	MIL-STD-883 Class B	座面最大高度：	5.59 mm
子类别：	Analog to Digital Converters	最大压摆率：	18 mA
标称供电电压：	5 V	表面贴装：	NO
技术：	CMOS	温度等级：	MILITARY
端子面层：	Tin/Lead (Sn63Pb37)	端子形式：	THROUGH-HOLE
端子节距：	2.54 mm	端子位置：	DUAL
处于峰值回流温度下的最长时间：	NOT APPLICABLE	宽度：	13.2 mm
Base Number Matches：	1

AD7874BQ 数据手册

AD7874

MULTIP LE AD 7874s

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.

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.

Microprocessor connections to the board are made via a 26-

contact IDC connector, SKT 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 SKT 5 and

SKT 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.

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.

SKT 1, SKT 2, SKT 3 and SKT 4 provide the inputs for V_IN1

_IN2, V_IN3, V_IN4respectively. Assuming LK1 to LK4 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 (LK5) on the

AD7874 CLK input which must be connected to either –5 V

(for the ADCs own internal clock) or to SKT 5. SKT 6 and

SKT 7 provide the reference and CONVST inputs respectively.

Shorting plug LK6 provides the option of using the external ref-

erence or the ADCs own internal reference.

CH1

CH2

CH3

CH4

AD7874(1)

REF OUT

R/W

STRB

N/C

CH5

CH6

CH7

CH8

N/C

INT

AD7874(2)

ADDRESS

DECODE

N/C

DB10

DB8

DB6

DB4

DB2

DB0

N/C

ADDRESS

DB11

REF IN

DB9

DB7

DB5

DB3

DB1

REF IN

CHm

CHm+1

CHm+2

CHm+3

AD7874(n)

GND

Figure 18. Multiple AD7874s in Multichannel System

Figure 19. SKT8, IDC Connector Pinout

P O WER SUP P LY CO NNECTIO NS

D ATA ACQ UISITIO N BO ARD

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.

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 SKT 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.

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 LK1 to

LK4 on the PCB) are provided on the analog inputs, one plug

per input. If the shorting plug for a particular channel is used,

REV. C

–13–

1...10 11 121314 15 16

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与AD7874BQ相关器件

型号	品牌	描述	获取价格	数据表
AD7874BQ/883B	ADI	ADC, Successive Approximation	获取价格
AD7874BR	ADI	LC2MOS 4-Channel, 12-Bit Simultaneous Sampling Data Acquisition System	获取价格
AD7874BR	ROCHESTER	4-CH 12-BIT SUCCESSIVE APPROXIMATION ADC, PARALLEL ACCESS, PDSO28, SOIC-28	获取价格
AD7874BR-REEL	ADI	IC 4-CH 12-BIT SUCCESSIVE APPROXIMATION ADC, PARALLEL ACCESS, PDSO28, SOIC-28, Analog to D	获取价格
AD7874BRZ	ADI	暂无描述	获取价格
AD7874BRZ-REEL	ADI	4-CH 12-BIT SUCCESSIVE APPROXIMATION ADC, PARALLEL ACCESS, PDSO28, SOIC-28	获取价格

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