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参数资料
| 型号： | AD678JD |
| 厂商： | Analog Devices Inc |
| 文件页数： | 14/14页 |
| 文件大小： | 0K |
| 描述： | IC ADC 12BIT SAMPLING 28-CDIP |
| 标准包装： | 1 |
| 位数： | 12 |
| 采样率（每秒）： | 200k |
| 数据接口： | 并联 |
| 转换器数目： | 2 |
| 功率耗散（最大）： | 745mW |
| 电压电源： | 模拟和数字，双 ± |
| 工作温度： | 0°C ~ 70°C |
| 安装类型： | 通孔 |
| 封装/外壳： | 28-CDIP（0.605"，15.37mm） |
| 供应商设备封装： | 28-CDIP |
| 包装： | 管件 |
| 输入数目和类型： | 1 个单端，单极；1 个单端，双极 |
AD678
REV. C
–9–
CONVERSION CONTROL
In synchronous mode (SYNC = HIGH), both Chip Select (
CS)
and Start Convert (
SC) must be brought LOW to start a con-
version.
CS should be LOW t
SC before SC is brought LOW. In
asynchronous mode (SYNC = LOW), a conversion is started by
bringing
SC low, regardless of the state of CS.
Before a conversion is started, End-of-Convert (EOC) is HIGH,
and the sample-hold is in track mode. After a conversion is
started, the sample-hold goes into hold mode and EOC goes
LOW, signifying that a conversion is in progress. During the
conversion, the sample-hold will go back into track mode and
start acquiring the next sample. EOC goes HIGH when the con-
version is finished.
In track mode, the sample-hold will settle to
±0.01% (12 bits)
in 1
s maximum. The acquisition time does not affect the
throughput rate as the AD678 goes back into track mode more
than 1
s before the next conversion. In multichannel systems,
the input channel can be switched as soon as EOC goes LOW if
the maximum throughput rate is needed.
12-Bit Mode Coding Format (1 LSB = 2.44 mV)
Unipolar Coding
Bipolar Coding
(Straight Binary)
(Twos Complement)
VIN*
Output Code
VIN*
Output Code
0 V
000 . . . 0
–5.000 V
100 . . . 0
5.000 V
100 . . . 0
–0.002 V
111 . . . 1
9.9976 V
111 . . . 1
+0.000 V
000 . . . 0
+2.500 V
010 . . . 0
+4.9976 V
011 . . . 1
*Code center.
OUTPUT ENABLE TRUTH TABLES
12-BIT MODE (12/
8 = HIGH)
INPUTS
OUTPUT
(
CS U OE)
DB11–DB0
1
High Z
0
Enable 12-Bit Output
8-BIT MODE (12/
8 = LOW)
INPUTS
OUTPUTS
R/
L HBE (CS U OE)
DB11 . . . DB4
X
1
High Z
1
0
0 000a b c d
Unipolar
1
0
e f
g h i
j
k l
Mode
0
a b c d e f
g h
0
1
0
i
j
k l
0000
1
0
a aaaab c d
Bipolar
1
0
e f
g h i
j
k 1
Mode
0
a b c d e f
g h
0
1
0
i
j
k l
0000
NOTES
1 = HIGH voltage level.
a = MSB.
0 = LOW voltage level.
1 = LSB.
X = Don’t care.
U = Logical OR.
END-OF-CONVERT
In asynchronous mode, End-of-Convert (EOC) is an open drain
output (requiring a minimum 3 k
pull-up resistor) enabled by
End-of-Convert ENable (
EOCEN). In synchronous mode,
EOC is a three-state output which is enabled by
EOCEN and
CS. See the Conversion Status Truth Table for details. Access
(tBA) and float (tFD) timing specifications do not apply in asyn-
chronous mode where they are a function of the time constant
formed by the 10 pF output capacitance and the pull-up
resistor.
START CONVERSION TRUTH TABLE
INPUTS
SYNC
CS
SC
STATUS
1
X
No Conversion
Synchronous
1
0
Start Conversion
Mode
1
0
Start Conversion
(Not Recommended)
1
0
Continuous Conversion
(Not Recommended)
0
X
1
No Conversion
Asynchronous
0
X
Start Conversion
Mode
0
X
0
Continuous Conversion
(Not Recommended)
NOTES
1 = HIGH voltage level.
0 = LOW voltage level.
X = Don’t care.
X = HIGH to LOW transition. Must stay low for t = tCP.
CONVERSION STATUS TRUTH TABLE
INPUTS
OUTPUT
SYNC
CS EOCEN EOC
STATUS
1
0
Converting
1
0
1
Not Converting
Synchronous
1
X
High Z
Either
Mode
1
X
1
High Z
Either
0
X
0
Converting
Asynchronous 0
X
0
High Z
Not Converting
Mode*
0
X
1
High Z
Either
NOTES
l = HIGH voltage level.
0 = LOW voltage level.
X = Don’t care.
*EOC requires a pull-up resistor in asynchronous mode.
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| AD678JN | 制造商:Analog Devices 功能描述:ADC Single Flash 200ksps 12-bit Parallel 28-Pin PDIP W 制造商:Rochester Electronics LLC 功能描述:IC - 12-BIT SAMPLING ADC - Bulk 制造商:Analog Devices 功能描述:SEMICONDUCTORSLINEAR ((NS)) |
| AD678JNZ | 功能描述:IC ADC 12BIT SAMPLING 28-DIP RoHS:是 类别:集成电路 (IC) >> 数据采集 - 模数转换器 系列:- 标准包装:1 系列:- 位数:14 采样率（每秒）:83k 数据接口:串行，并联 转换器数目:1 功率耗散（最大）:95mW 电压电源:双 ± 工作温度:0°C ~ 70°C 安装类型:通孔 封装/外壳:28-DIP（0.600"，15.24mm） 供应商设备封装:28-PDIP 包装:管件 输入数目和类型:1 个单端，双极 |
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| AD678KD | 功能描述:IC ADC 12BIT SAMPLING 28-CDIP RoHS:否 类别:集成电路 (IC) >> 数据采集 - 模数转换器 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:250 系列:- 位数:12 采样率（每秒）:1.8M 数据接口:并联 转换器数目:1 功率耗散（最大）:1.82W 电压电源:模拟和数字 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:48-LQFP 供应商设备封装:48-LQFP（7x7） 包装:管件 输入数目和类型:2 个单端，单极 |
| AD678KN | 制造商:Analog Devices 功能描述:ADC Single Flash 200ksps 12-bit Parallel 28-Pin PDIP W |
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