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参数资料
| 型号： | AD7575JNZ |
| 厂商： | Analog Devices Inc |
| 文件页数： | 11/12页 |
| 文件大小： | 0K |
| 描述： | IC ADC 8BIT LC2MOS W/HOLD 18DIP |
| 标准包装： | 20 |
| 位数： | 8 |
| 采样率（每秒）： | 50k |
| 数据接口： | 并联 |
| 转换器数目： | 1 |
| 功率耗散（最大）： | 15mW |
| 电压电源： | 单电源 |
| 工作温度： | 0°C ~ 70°C |
| 安装类型： | 通孔 |
| 封装/外壳： | 18-DIP（0.300"，7.62mm） |
| 供应商设备封装： | 18-PDIP |
| 包装： | 管件 |
| 输入数目和类型： | 1 个单端，单极；1 个单端，双极 |
AD7575
–8–
REV. B
INTERNAL/EXTERNAL CLOCK
The AD7575 can be used with its own internal clock or with an
externally applied clock. In either case, the clock signal appear-
ing at the CLK pin is divided internally by two to provide an
internal clock signal for the AD7575. A single conversion lasts
for 20 input clock cycles (10 internal clock cycles).
INTERNAL CLOCK
Clock pulses are generated by the action of the external capaci-
tor (CCLK) charging through an external resistor (RCLK) and
discharging through an internal switch. When a conversion is
complete, the internal clock stops operating. In addition to
conversion, the internal clock also controls the automatic inter-
nal reset of the SAR. This reset occurs at the start of each con-
version cycle during the first internal clock pulse.
Nominal conversion times versus temperature for the recom-
mended RCLK and CCLK combination are shown in Figure 13.
AMBIENT TEMPERATURE – C
14
7
–55
+125
–25
CONVERSION
TIME
–
s
0
+25
+50
+75
+100
13
11
10
9
8
12
RCLK = 100k
CCLK = 100pF
Figure 13. Typical Conversion Times vs. Temperature
Using Internal Clock
The internal clock is useful because it provides a convenient
clock source for the AD7575. Due to process variations, the
actual operating frequency for this RCLK/CCLK combination can
vary from device to device by up to
±50%. For this reason it is
recommended that an external clock be used in the following
situations:
1. Applications requiring a conversion time that is within 50% of
5
s, the minimum conversion time for specified accuracy. A
clock frequency of 4 MHz at the CLK pin gives a conversion
time of 5
s.
2. Applications where time related software constraints cannot
accommodate time differences that may occur due to unit to
unit clock frequency variations or temperature.
EXTERNAL CLOCK
The CLK input of the AD7575 may be driven directly from
74 HC, 4000B series buffers (such as 4049) or from LS TTL
with a 5.6 k
pull-up resistor. When conversion is complete, the
internal clock is disabled even if the external clock is still ap-
plied. This means that the external clock can continue to run
between conversions without being disabled. The mark/space
ratio of the external clock can vary from 70/30 to 30/70.
The AD7575 is specified for operation at a 5
s conversion rate;
with a 4 MHz input clock frequency. If the part is operated at
slower clock frequencies, it may result in slightly degraded accu-
racy performance from the part. This is a result of leakage ef-
fects on the hold capacitor. Figure 14 shows a typical plot of
accuracy versus conversion time for the AD7575.
CONVERSION TIME –
s
2.5
5
10000
RELATIVE
ACCURACY
–
LSB
50
500
2.0
1.5
1.0
0.5
0
100
1000
5000
10
TA = +25 C
AD7575KN
Figure 14. Accuracy vs. Conversion Time
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相关代理商/技术参数 |
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|---|---|
| AD7575JP | 制造商:Analog Devices 功能描述:ADC Single SAR 8-bit Parallel 20-Pin PLCC 制造商:Rochester Electronics LLC 功能描述:CMOS CONVERTER IC - Bulk |
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| AD7575JPZ | 功能描述:IC ADC 8BIT TRACK&HOLD 20-PLCC RoHS:是 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:2,500 系列:- 位数:12 采样率（每秒）:3M 数据接口:- 转换器数目:- 功率耗散（最大）:- 电压电源:- 工作温度:- 安装类型:表面贴装 封装/外壳:SOT-23-6 供应商设备封装:SOT-23-6 包装:带卷 (TR) 输入数目和类型:- |
| AD7575JPZ-REEL | 功能描述:IC ADC 8BIT LC2MOS W/HOLD 20PLCC RoHS:是 类别:集成电路 (IC) >> 数据采集 - 模数转换器 系列:- 标准包装:1,000 系列:- 位数:16 采样率（每秒）:45k 数据接口:串行 转换器数目:2 功率耗散（最大）:315mW 电压电源:模拟和数字 工作温度:0°C ~ 70°C 安装类型:表面贴装 封装/外壳:28-SOIC（0.295"，7.50mm 宽） 供应商设备封装:28-SOIC W 包装:带卷 (TR) 输入数目和类型:2 个单端，单极 |
| AD7575JR | 制造商:Analog Devices 功能描述:ADC Single SAR 8-bit Parallel 18-Pin SOIC 制造商:Rochester Electronics LLC 功能描述:8 BIT ADC IC - Bulk |
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