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參數(shù)資料
| 型號： | ADS7804PB |
| 英文描述： | 12-Bit 10ms Sampling CMOS ANALOG-to-DIGITAL CONVERTER |
| 中文描述： | 12位10ms的采樣CMOS模擬數(shù)字轉(zhuǎn)換器 |
| 文件頁數(shù)： | 8/10頁 |
| 文件大?。?/td> | 182K |
| 代理商： | ADS7804PB |
8
ADS7804
INPUT RANGES
The ADS7804 offers a standard
±
10V input range. Figure 6
shows the necessary circuit connections for the ADS7804
with and without hardware trim. Offset and full scale error
(1)
specifications are tested and guaranteed with the fixed resis-
tors shown in Figure 6b. Adjustments for offset and gain are
described in the
Calibration
section of this data sheet.
The offset and gain are adjusted internally to allow external
trimming with a single supply. The external resistors com-
pensate for this adjustment and can be left out if the offset
and gain will be corrected in software (refer to the
Calibra-
tion
section).
The nominal input impedance of 23k
results from the
combination of the internal resistor network shown on the
front page of the product data sheet and the external resistors.
The input resistor divider network provides inherent overvolt-
age protection guaranteed to at least
±
25V. The 1% resistors
used for the external circuitry do not compromise the accuracy
or drift of the converter. They have little influence relative to
the internal resistors, and tighter tolerances are not required.
NOTE: (1) Full scale error includes offset and gain errors measured at both +FS
and –FS.
CALIBRATION
The ADS7804 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 ADS7804, install the
proper resistors and potentiometers as shown in Figure 6a. The
calibration range is
±
15mV for the offset and
±
60mV for the
gain.
SOFTWARE CALIBRATION
To calibrate the offset and gain of the ADS7804 in software,
no external resistors are required. See the
No Calibration
section for details on the effects of the external resistors. Refer
to Table V for range of offset and gain errors with and without
external resistors.
NO CALIBRATION
See Figure 6b for circuit connections. The external resistors
shown in Figure 6b may not be necessary in some applica-
tions. These resistors provide compensation for an internal
adjustment of the offset and gain which allows calibration
with a single supply. The nominal transfer function of the
ADS7804 will be bound by the shaded region seen in Figure
7 with a typical offset of –30mV and a typical gain error of
–1.5%. Refer to Table V for range of offset and gain errors
with and without external resistors.
WITH
WITHOUT
EXTERNAL
RESISTORS
EXTERNAL
RESISTORS
UNITS
BPZ
–10 < BPZ < 10
–2 < BPZ < 2
–45 < BPZ < 5
–8 < BPZ < 1
mV
LSBs
Gain
Error
–0.5 < error < 0.5
–0.25 < error < 0.25
(1)
–0.6 < error < –0.55
–0.45 < error < –0.3
(1)
% of FSR
NOTE: (1) High Grade.
TABLE VII. Bipolar Offset and Gain Errors With and
Without External Resistors.
FIGURE 6. Circuit Diagram With and Without External Resistors.
a)
±
10V With Hardware
Trim
b)
±
10V Without Hardware
Trim
NOTE: Use 1% metal film resistors.
200
1
2
3
4
5
AGND2
CAP
REF
AGND1
V
IN
+
2.2μF
+5V
50k
50k
33.2k
576k
+
2.2μF
Gain
±10V
Offset
200
1
2
3
4
5
AGND2
CAP
REF
AGND1
V
IN
+
2.2μF
33.2k
±10V
+
2.2μF
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ADS7804PBG4 | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 12B 10us Sampling CMOS ADC RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 結(jié)構(gòu):Sigma-Delta 轉(zhuǎn)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(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-32 |
| ADS7804PG4 | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 12-Bit 10us Sampling CMOS RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 結(jié)構(gòu):Sigma-Delta 轉(zhuǎn)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(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-32 |
| ADS7804U | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 12-Bit 10us Sampling CMOS RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 結(jié)構(gòu):Sigma-Delta 轉(zhuǎn)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(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-32 |
| ADS7804U/1K | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 12-Bit 10us Sampling CMOS RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 結(jié)構(gòu):Sigma-Delta 轉(zhuǎn)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(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-32 |
| ADS7804U/1KE4 | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 12-Bit 10us Sampling CMOS RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 結(jié)構(gòu):Sigma-Delta 轉(zhuǎn)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(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-32 |
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