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参数资料
| 型号： | AD1671JQ |
| 厂商： | Analog Devices Inc |
| 文件页数： | 3/16页 |
| 文件大小： | 0K |
| 描述： | IC ADC SNGL 12BIT 28-CDIP |
| 标准包装： | 1 |
| 位数： | 12 |
| 采样率（每秒）： | 1.25M |
| 数据接口： | 并联 |
| 转换器数目： | 2 |
| 功率耗散（最大）： | 750mW |
| 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（0.600"，15.24mm） |
| 供应商设备封装： | 28-CDIP |
| 包装： | 管件 |
| 输入数目和类型： | 2 个单端，双极；2 个单端，单极 |
AD1671
REV. B
–11–
Table III. Output Data Format
Input
Analog
Digital
Range
Coding
Input
l
Output
OTR
2
0 V to +2.5 V
Straight Binary
≤ –0.0003 V
0000 0000 0000
1
0 V
0000 0000 0000
0
+2.5 V
1111 1111 1111
0
≥ +2.5003 V
1111 1111 1111
1
0 V to +5 V
Straight Binary
≤ –0.0006 V
0000 0000 0000
1
0 V
0000 0000 0000
0
+5 V
1111 1111 1111
0
≥ +5.0006 V
1111 1111 1111
1
–2.5 V to +2.5 V
Offset Binary
≤ –2.5006 V
0000 0000 0000
1
–2.5 V
0000 0000 0000
0
+2.5 V
1111 1111 1111
0
≥ +2.4994 V
1111 1111 1111
1
–5 V to +5 V
Offset Binary
≤ –5.0012 V
0000 0000 0000
1
–5 V
0000 0000 0000
0
+5 V
1111 1111 1111
0
≥ +4.9988 V
1111 1111 1111
1
–2.5 V to +2.5 V
Twos Complement
≤ –2.5006 V
1000 0000 0000
1
(Using MSB)
–2.5 V
1000 0000 0000
0
+2.5 V
0111 1111 1111
0
≥ +2.4994 V
0111 1111 1111
1
–5 V to +5 V
Twos Complement
≤ –5.0012 V
1000 0000 0000
1
(Using MSB)
–5 V
1000 0000 0000
0
+5 V
0111 1111 1111
0
≥ +4.9988 V
0111 1111 1111
1
NOTES
1Voltages listed are with offset and gain errors adjusted to zero.
2Typical performance.
OUTPUT DATA FORMAT
The AD1671 provides both MSB and MSB outputs, delivering
data in positive true straight binary for unipolar input ranges
and positive true offset binary or twos complement for bipolar
input ranges. Straight binary coding is used for systems that ac-
cept positive-only signals. If straight binary coding is used with
bipolar input signals, a 0 V input would result in a binary output
of 2048. The application software would have to subtract 2048
to determine the true input voltage. Host registers typically per-
form math on signed integers and assume data is in that format.
Twos complement format minimizes software overhead which is
especially important in high speed data transfers, such as a
DMA operation. The CPU is not bogged down performing data
conversion steps, hence the total system throughput is increased.
OPTIONAL EXTERNAL REFERENCE
The AD1671 includes an onboard +2.5 V reference. The refer-
ence input pin (REF IN) can be connected to reference output
pin (REF OUT) or a standard external +2.5 V reference can be
selected to meet specific system requirements. Fast switching in-
put dependent currents are modulated at the reference input.
The reference input voltage can be held with the use of a capaci-
tor. To prevent the AD1671’s onboard reference from oscil-
lating when not connected to REF IN, REF OUT must be
connected to +5 V. It is possible to connect REF OUT to +5 V
due to its output circuit implementation which shuts down the
reference.
ILOGIC VS. CONVERSION RATE
Figure 15 is the typical logic supply current vs. conversion rate
for various capacitor loads on the digital outputs.
6.5
6.0
5.5
5.0
4.5
4.0
3.5
3.0
2.5
2.0
1.5
1.0
0.5
1M
CONVERSION RATE – Hz
mA
1k
10k
100k
CL = 50pF
CL = 30pF
CL = 0pF
Figure 15. ILOGIC vs. Conversion Rate for Various
Capacitive Loads on the Digital Outputs
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相关代理商/技术参数 |
参数描述 |
|---|---|
| AD1671K | 制造商:AD 制造商全称:Analog Devices 功能描述:Complete 12-Bit 1.25 MSPS Monolithic A/D Converter |
| AD1671KP | 功能描述:IC ADC SNGL 12BIT 28PLCC 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 |
| AD1671KPZ | 制造商:Analog Devices 功能描述:ADC Single Pipelined 1.25Msps 12-bit Parallel 28-Pin PLCC 制造商:Analog Devices 功能描述:IC, 12-BIT 1.25 MSPS ADC - Rail/Tube |
| AD1671KQ | 功能描述:IC ADC SNGL 12BIT 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 |
| AD1671S | 制造商:AD 制造商全称:Analog Devices 功能描述:Complete 12-Bit 1.25 MSPS Monolithic A/D Converter |
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