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參數資料
| 型號： | ADS950 |
| 廠商： | Electronic Theatre Controls, Inc. |
| 元件分類： | 串行ADC |
| 英文描述： | 18-Bit, 500kHz, Low-Power Sampling A/D Converters |
| 中文描述： | 18位，為500kHz，低功耗采樣A / D轉換器 |
| 文件頁數： | 3/6頁 |
| 文件大小： | 184K |
| 代理商： | ADS950 |
ADS -950
3
+25°C
TYP.
0 to +70°C
TYP.
–55 to +125°C
TYP.
ANALOG OUTPUT
MIN.
MAX.
MIN.
MAX.
MIN.
MAX.
UNITS
Internal Reference
Voltage
Drift
External Current
+4.95
—
—
+5.0
±30
1
+5.05
—
—
+4.95
—
—
+5.0
±30
1
+5.05
—
—
+4.95
—
—
+5.0
±30
1
+5.05
—
—
Volts
ppm/°C
mA
DIGITAL OUTPUTS
Logic Levels
Logic "1"
Logic "0"
Logic Loading "1"
Logic Loading "0"
Output Coding
+2.4
—
—
—
—
—
—
—
—
+0.4
–4
+4
+2.4
—
—
—
—
—
—
—
—
+0.4
–4
+4
+2.4
—
—
—
—
—
—
—
—
+0.4
–4
+4
Volts
Volts
mA
mA
Complementary Offset Binary
POWER REQUIREMENTS
Power Supply Ranges
+15V Supply
–15V Supply
+5V Supply
–5V Supply
Power Supply Currents
+15V Supply
–15V Supply
+5V Supply
–5V Supply
Power Dissipation
Power Supply Rejection
+14.5
–14.5
+4.75
–4.75
+15.0
–15.0
+5.0
–5.0
+15.5
–15.5
+5.25
–5.25
+14.5
–14.5
+4.75
–4.75
+15.0
–15.0
+5.0
–5.0
+15.5
–15.5
+5.25
–5.25
+14.5
–14.5
+4.75
–4.75
+15.0
–15.0
+5.0
–5.0
+15.5
–15.5
+5.25
–5.25
Volts
Volts
Volts
Volts
—
—
—
—
—
—
+29
–15
+104
–54
1.45
—
—
—
—
—
1.65
±0.05
—
—
—
—
—
—
+29
–15
+104
–54
1.45
—
—
—
—
—
1.65
±0.05
—
—
—
—
—
—
+29
–15
+104
–54
1.45
—
—
—
—
—
1.65
±0.05
mA
mA
mA
mA
Watts
%FSR/%V
THERMAL REQUIREMENTS
All DATEL sampling A/D converters are fully characterized and
specified over operating temperature (case) ranges of 0 to
+70°C and –55 to +125°C. All room-temperature (T
A
= +25°C)
production testing is performed without the use of heat sinks or
forced-air cooling. Thermal impedance figures for each device
are listed in their respective specification tables.
These devices do not normally require heat sinks, however,
standard precautionary design and layout procedures should be
used to ensure devices do not overheat. The ground and power
planes beneath the package, as well as all pcb signal runs to
and from the device, should be as heavy as possible to help
conduct heat away from the package. Electrically-insulating,
thermally-conductive "pads" may be installed underneath the
package. Devices should be soldered to boards rather than
"socketed", and of course, minimal air flow over the surface can
greatly help reduce the package temperature.
TECHNICAL NOTES
1. Obtaining fully specified performance from the ADS-950
requires careful attention to pc-card layout and power
supply decoupling. The device's analog and digital ground
systems are not connected to each other internally. For
optimal performance, tie all ground pins (3, 12 and 13)
directly to a large
analog
ground plane beneath the
package.
Bypass all power supplies and the +5V REFERENCE
OUTPUT (pin 5) to ground with 10μF tantalum capacitors in
parallel with 0.1μF ceramic capacitors. Locate the bypass
capacitors as close to the unit as possible. Tie a 47μF
capacitor between COMPENSATION (pin 7) and ground.
2. The ADS-950 achieves its specified accuracies without the
need for external calibration. If required, the device's small
initial errors can be reduced to zero using the adjustment
circuitry shown in Figure 2. When using this circuitry, or any
similar offset and gain calibration hardware, make adjust-
ments following warmup. To avoid interaction, always adjust
offset before gain. Float pin 6 if not using gain adjust
circuits.
Footnotes:
All power supplies must be on before applying a start convert pulse. All
supplies and the clock (START CONVERT) must be present during warmup
periods. The device must be continuously converting during this time.
This is the time required before the A/D output data is valid once the analog input
is back within the specified range.
6.02
(SNR + Distortion) – 1.76 + 20 log
Full Scale Amplitude
Actual Input Amplitude
Contact DATEL for other input voltage ranges.
A 500kHz clock with a 1μsec positive pulse width (50% duty cycle) is
used for all production testing. Any duty cycle may be used as long as a
mnimumpositive pulse width of 20nsec is maintained. For applications
requiring lower sampling rates, clock frequencies lower than 1MHz
may be used.
Effective bits is equal to:
3. Applying a start convert pulse while a conversion is in
progress (EOC = logic "1") will initiate a new and probably
inaccurate conversion cycle. Data for the interrupted and
subsequent conversions will be invalid.
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相關代理商/技術參數 |
參數描述 |
|---|---|
| ADS-950MC | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:18-Bit, 500kHz, Low-Power Sampling A/D Converters |
| ADS-950MM | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:18-Bit, 500kHz, Low-Power Sampling A/D Converters |
| ADS-951 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:18-Bit, 1MHz, Low-Power Sampling A/D Converters |
| ADS-951MC | 功能描述:模數轉換器 - ADC 0 to +70C 1.45W A/D 32pinTDIP 18Bit 1MHz RoHS:否 制造商:Texas Instruments 通道數量:2 結構:Sigma-Delta 轉換速率:125 SPs to 8 KSPs 分辨率:24 bit 輸入類型:Differential 信噪比:107 dB 接口類型:SPI 工作電源電壓:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:VQFN-32 |
| ADS-951ME | 制造商:Murata Power Solutions 功能描述:Dual ADC 2-Step Flash 1Msps 18-bit Parallel 32-Pin TDIP |
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