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參數資料
| 型號： | ADS8504IB |
| 英文描述： | 12-BIT 250-KSPS SAMPLING CMOS ANALOG-TO-DIGITAL CONVERTER |
| 中文描述： | 12位250 kSPS的采樣CMOS模擬數字轉換器 |
| 文件頁數： | 13/19頁 |
| 文件大?。?/td> | 361K |
| 代理商： | ADS8504IB |
www.ti.com
APPLICATION INFORMATION
CALIBRATION
The ADS8504 can be trimmed in hardware or software. The offset should be trimmed before the gain since the
offset directly affects the gain. To achieve optimum performance, several iterations may be required.
Hardware Calibration
To calibrate the offset and gain of the ADS8504, install the proper resistors and potentiometers as shown in
Figure 23
(a).
Software Calibration
To calibrate the offset and gain of the ADS8504 in software, no external resistors are required. See the No
Calibration section for details on the effects of the external resistors. Refer to
Table 4
for range of offset and gain
errors with and without external resistors.
No Calibration
See
Figure 23
(b) for circuit connections. The external resistors shown in
Figure 23
(b) may not be necessary in
some applications. These resistors provide compensation for an internal adjustment of the offset and gain which
allows calibration with a single supply. Refer to
Table 4
for range of offset and gain errors with and without
external resistors.
1
2
3
4
5
AGND2
CAP
REF
AGND1
VIN
+
+5 V
+
Gain
Offset
1
2
3
4
5
AGND2
CAP
REF
AGND1
VIN
+
+
±
10 V
200
33.2 k
50 k
50 k
2.2
μ
F
2.2
μ
F
2.2
μ
F
2.2
μ
F
200
33.2 k
±
10 V
(a)
±
10 V With Hardware Trim
(b)
±
10 V Without Hardware Trim
Note: Use 1% metal film resistors.
576 k
REFERENCE
The ADS8504 can operate with its internal 2.5-V reference or an external reference. By applying an external
reference to pin 5, the internal reference can be bypassed. The reference voltage at REF is buffered internally
with the output on CAP (pin 4).
ADS8504
SLAS434–JUNE 2005
Table 4. Typical Offset (Bipolar Zero Error, BPZ) and Gain Errors With and Without External Resistors
WITH EXTERNAL RESISTORS
-4.88 < BPZ < 4.88
-1 < BPZ < 1
-0.25 < Error < 0.25
-0.25 < Error < 0.25
WITHOUT EXTERNAL RESISTORS
-56.6 < BPZ < -32.2
-11.6 < BPZ < -6.6
-2.5 < Error < -1.25
-3.5 < Error < -2.25
UNITS
mV
LSBs
BPZ
+Full scale
–Full scale
Gain error
% of FSR
Figure 23. Circuit Diagram With and Without External Trim Hardware
The internal reference has an 8 ppm/°C drift (typical) and accounts for approximately 20% of the full-scale error
(FSE = ±0.5%).
13
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相關代理商/技術參數 |
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| ADS8504IBDW | 功能描述:模數轉換器 - ADC 12-Bit 250kHz CMOS w/Parallel Interface 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 |
| ADS8504IBDWG4 | 功能描述:模數轉換器 - ADC 12-Bit 250kHz CMOS w/Parallel Interface 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 |
| ADS8504IBDWR | 功能描述:模數轉換器 - ADC 12-Bit 250kHz CMOS w/Parallel Interface 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 |
| ADS8504IBDWRG4 | 功能描述:模數轉換器 - ADC 12-Bit 250kHz CMOS w/Parallel Interface 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 |
| ADS8505 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:16-BIT 250-KSPS SAMPLING CMOS ANALOG-TO-DIGITAL CONVERTER |
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