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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： | 4/6頁 |
| 文件大小： | 184K |
| 代理商： | ADS950 |
ADS -950
4
Zero/Offset Adjust Procedure
1. Apply a train of pulses to the START CONVERT input
(pin 16) so that the converter is continuously converting.
2. For bipolar zero/offset adjust, apply –19μV to the ANALOG
INPUT (pin 4).
3. Adjust the offset potentiometer until the output code flickers
equally between 01 1111 1111 1111 1111 and 10 0000
0000 0000 0000.
Gain Adjust Procedure
1. Apply –4.999943V to the ANALOG INPUT (pin 4).
2. Adjust the gain potentiometer until all output bits are 1's
and the LSB flickers between 1 and 0.
3. To confirm proper operation of the device, vary the applied
input voltage to obtain the output coding listed in Table 2.
BIPLOAR
SCALE
INPUT VOLTAGE
±5V
MSB
LSB
+FS –1 LSB
+3/4 FS
+1/2 FS
0
–1/2 FS
–3/4 FS
–FS +1 LSB
–FS
+4.999962
+3.750000
+2.500000
+0.000000
–2.500000
–3.750000
–4.999962
–5.000000
00 0000 0000 0000 0000
00 0111 1111 1111 1111
00 1111 1111 1111 1111
01 1111 1111 1111 1111
10 1111 1111 1111 1111
11 0111 1111 1111 1111
11 1111 1111 1111 1110
11 1111 1111 1111 1111
OUTPUT CODING
COMPLEMENTARY
OFFSET BINARY
Table 2. Output Coding
CALIBRATION PROCEDURE
Connect the converter per Table 1 for the appropriate input
voltage range. Any offset/gain calibration procedures should
not be implemented until the device is fully warmed up. To
avoid interaction, adjust offset before gain. The ranges of
adjustment for the circuits in Figure 2 are guaranteed to
compensate for the ADS-950's initial accuracy errors and may
not be able to compensate for additional system errors.
A/D converters are calibrated by positioning their digital outputs
exactly on the transition point between two adjacent digital
output codes. This is accomplished by connecting LED's to the
digital outputs and performing adjustments until certain LED's
"flicker" equally between on and off. Other approaches employ
digital comparators or microcontrollers to detect when the
outputs change from one code to the next.
For the ADS-950, offset adjusting is normally accomplished
when the analog input is 0 minus LSB (–19μV). See Table 2
for the proper bipolar output coding.
Gain adjusting is accomplished when the analog input is at
nominal full scale minus 1LSB's (–4.999943V).
INPUT VOLTAGE
RANGE
ZERO ADJUST
(– LSB)
GAIN ADJUST
(–FS +1 LSB)
±5V
–19μV
–4.999943
Table 1. Input Connections
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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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