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| 型號(hào)： | AD670KN |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | ADC |
| 英文描述： | Low Cost Signal Conditioning 8-Bit ADC |
| 中文描述： | 2-CH 8-BIT SUCCESSIVE APPROXIMATION ADC, PARALLEL ACCESS, PDIP20 |
| 封裝： | PLASTIC, DIP-20 |
| 文件頁數(shù)： | 4/12頁 |
| 文件大小： | 364K |
| 代理商： | AD670KN |
AD670
REV. A
–4–
ORDERING GUIDE
Temperature
Range
Relative Accuracy
@ +25
8
C
Gain Accuracy
@ +25
8
C
Model
1
Package Option
2
AD670JN
AD670JP
AD670KN
AD670KP
AD670AD
AD670BD
AD670SD
0
°
C to +70
°
C
0
°
C to +70
°
C
0
°
C to +70
°
C
0
°
C to +70
°
C
–40
°
C to +85
°
C
–40
°
C to +85
°
C
–55
°
C to +125
°
C
±
1/2 LSB
±
1/2 LSB
±
1/4 LSB
±
1/4 LSB
±
1/2 LSB
±
1/4 LSB
±
1/2 LSB
±
1.5 LSB
±
1.5 LSB
±
0.75 LSB
±
0.75 LSB
±
1.5 LSB
±
0.75 LSB
±
1.5 LSB
Plastic DIP (N-20)
PLCC (P-20A)
Plastic DIP (N-20)
PLCC (P-20A)
Ceramic DIP (D-20)
Ceramic DIP (D-20)
Ceramic DIP (D-20)
NOTES
1
For details on grade and package offerings screened in accordance with MIL-STD-883 refer to the Analog Devices
Military Products Databook.
2
D = Ceramic DIP; N = Plastic DIP; P = Plastic Leaded Chip Carrier.
Figure 1. AD670 Block Diagram and Terminal
Configuration (AII Packages)
ABSOLUTE MAXIMUM RATINGS
*
V
CC
to Ground . . . . . . . . . . . . . . . . . . . . . . . . . . .0 V to +7.5 V
Digital Inputs (Pins 11–15) . . . . . . . . . . .–0.5 V to V
CC
+0.5 V
Digital Outputs (Pins 1–9) . Momentary Short to V
CC
or Ground
Analog Inputs (Pins 16–19) . . . . . . . . . . . . . . . –30 V to +30 V
Power Dissipation . . . . . . . . . . . . . . . . . . . . . . . . . . . .450 mW
Storage Temperature Range . . . . . . . . . . . . .–65
°
C to +150
°
C
Lead Temperature (Soldering, 10 sec) . . . . . . . . . . . . . +300
°
C
*Stresses above those listed under “Absolute Maximum Ratings” may cause
permanent damage to the device. This is a stress rating only and functional
operation of the device at them or any other conditions above those indicated in
the operational sections of this specification is not implied. Exposure to absolute
maximum rating conditions for extended periods may affect device reliability.
CIRCUIT OPERATION/FUNCTIONAL DESCRIPTION
The AD670 is a functionally complete 8-bit signal conditioning
A/D converter with microprocessor compatibility. The input
section uses an instrumentation amplifier to accomplish the
voltage to current conversion. This front end provides a high
impedance, low bias current differential amplifier. The com-
mon-mode range allows the user to directly interface the device
to a variety of transducers.
The AID conversions are controlled by R/
W
,
CS
, and
CE
. The
R/
W
line directs the converter to read or start a conversion. A
minimum write/start pulse of 300 ns is required on either
CE
or
CS
. The STATUS line goes high, indicating that a conversion is
in process. The conversion thus begun, the internal 8-bit DAC
is sequenced from MSB to LSB using a novel successive ap-
proximation technique. In conventional designs, the DAC is
stepped through the bits by a clock. This can be thought of as a
static design since the speed at which the DAC is sequenced is
determined solely by the clock. No clock is used in the AD670.
Instead, a “dynamic SAR” is created consisting of a string of in-
verters with taps along the delay line. Sections of the delay line
between taps act as one shots. The pulses are used to set and re-
set the DAC’s bits and strobe the comparator. When strobed,
the comparator then determines whether the addition of each
successively weighted bit current causes the DAC current sum
to be greater or less than the input current. If the sum is less,
the bit is turned off. After all bits are tested, the SAR holds an
8-bit code representing the input signal to within 1/2 LSB
accuracy. Ease of implementation and reduced dependence on
process related variables make this an attractive approach to a
successive approximation design.
The SAR provides an end-of-conversion signal to the control
logic which then brings the STATUS line low. Data outputs re-
main in a high impedance state until R/
W
is brought high with
CE
and
CS
low and allows the converter to be read. Bringing
CE
or
CS
high during the valid data period ends the read cycle.
The output buffers cannot be enabled during a conversion. Any
convert start commands will be ignored until the conversion
cycle is completed; once a conversion cycle has been started it
cannot be stopped or restarted.
The AD670 provides the user with a great deal of flexibility by
offering two input spans and formats and a choice of output
codes. Input format and input range can each be selected. The
BPO/
UPO
pin controls a switch which injects a bipolar offset
current of a value equal to the MSB less 1/2 LSB into the sum-
ming node of the comparator to offset the DAC output. Two
precision 10 to 1 attenuators are included on board to provide
input range selection of 0 V to 2.55 V or 0 mV to 255 mV. Ad-
ditional ranges of –1.28 V to 1.27 V and –128 mV to 127 mV
are possible if the BPO/
UPO
switch is high when the conversion
is started. Finally, output coding can be chosen using the FOR-
MAT pin when the conversion is started. In the bipolar mode
and with a Logic 1 on FORMAT, the output is in two’s comple-
ment; with a Logic 0, the output is offset binary.
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| AD670KNZ | 功能描述:IC ADC 8BIT SGNL COND 20DIP RoHS:是 類別:集成電路 (IC) >> 數(shù)據(jù)采集 - 模數(shù)轉(zhuǎn)換器 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:2,500 系列:- 位數(shù):12 采樣率（每秒）:3M 數(shù)據(jù)接口:- 轉(zhuǎn)換器數(shù)目:- 功率耗散（最大）:- 電壓電源:- 工作溫度:- 安裝類型:表面貼裝 封裝/外殼:SOT-23-6 供應(yīng)商設(shè)備封裝:SOT-23-6 包裝:帶卷 (TR) 輸入數(shù)目和類型:- |
| AD670KP | 制造商:Analog Devices 功能描述:ADC Single SAR 8-bit Parallel 20-Pin PLCC |
| AD670KPZ | 功能描述:IC ADC 8BIT SIGNAL COND 20-PLCC 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:- 位數(shù):14 采樣率（每秒）:83k 數(shù)據(jù)接口:串行，并聯(lián) 轉(zhuǎn)換器數(shù)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(yīng)商設(shè)備封裝:28-PDIP 包裝:管件 輸入數(shù)目和類型:1 個(gè)單端，雙極 |
| AD670SD | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| AD670SD/883B | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 8-B Signal Condition RoHS:否 制造商:Analog Devices 通道數(shù)量: 結(jié)構(gòu): 轉(zhuǎn)換速率: 分辨率: 輸入類型: 信噪比: 接口類型: 工作電源電壓: 最大工作溫度: 安裝風(fēng)格: 封裝 / 箱體: |
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