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參數(shù)資料
| 型號(hào)： | ADS1241E/1K |
| 廠商： | Texas Instruments |
| 文件頁數(shù)： | 4/30頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC ADC 24-BIT SER PROGBL 28-SSOP |
| 產(chǎn)品培訓(xùn)模塊： | Data Converter Basics |
| 視頻文件： | Nuts and Bolts of the Delta-Sigma Converter |
| 標(biāo)準(zhǔn)包裝： | 1 |
| 位數(shù)： | 24 |
| 采樣率（每秒）： | 15 |
| 數(shù)據(jù)接口： | 串行，SPI? |
| 轉(zhuǎn)換器數(shù)目： | 1 |
| 功率耗散（最大）： | 1.9mW |
| 電壓電源： | 模擬和數(shù)字 |
| 工作溫度： | -40°C ~ 85°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 28-SSOP（0.209"，5.30mm 寬） |
| 供應(yīng)商設(shè)備封裝： | 28-SSOP |
| 包裝： | 標(biāo)準(zhǔn)包裝 |
| 輸入數(shù)目和類型： | 8 個(gè)單端，單極；4 個(gè)差分，單極 |
| 其它名稱： | 296-25895-6 |
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ADS1240, 1241
12
SBAS173F
www.ti.com
SELFGCAL. Afterwards set PGA = 64 and issue SELFOCAL.
For operation with a reference voltage greater than (AVDD –
1.5) volts, the buffer must also be turned off during gain self-
calibration to avoid exceeding the buffer input range.
System calibration corrects both internal and external offset
and gain errors. While performing system calibration, the
appropriate signal must be applied to the inputs. The system
offset calibration command (SYSOCAL) requires a zero input
differential signal (see Table IV, page 18). It then computes
the offset that nullifies the offset in the system. The system
gain calibration command (SYSGCAL) requires a positive
full-scale input signal. It then computes a value to nullify the
gain error in the system. Each of these calibrations takes two
tDATA periods to complete. System gain calibration is recom-
mended for the best gain calibration at higher PGAs.
Calibration should be performed after power on, a change in
temperature, or a change of the PGA. The RANGE bit (ACR bit
2) must be zero during calibration.
Calibration removes the effects of the ODAC; therefore, dis-
able the ODAC during calibration, and enable again after
calibration is complete.
At the completion of calibration, the DRDY signal goes low,
indicating the calibration is finished. The first data after
calibration should be discarded since it may be corrupt from
calibration data remaining in the filter. The second data is
always valid.
EXTERNAL VOLTAGE REFERENCE
The ADS1240 and ADS1241 require an external voltage
reference. The selection for the voltage reference value is
made through the ACR register.
The external voltage reference is differential and is repre-
sented by the voltage difference between the pins: +VREF
and –VREF. The absolute voltage on either pin, +VREF or
–VREF, can range from AGND to AVDD. However, the follow-
ing limitations apply:
For AVDD = 5.0V and RANGE = 0 in the ACR, the differential
VREF must not exceed 2.5V.
For AVDD = 5.0V and RANGE = 1 in the ACR, the differential
VREF must not exceed 5V.
For AVDD = 3.0V and RANGE = 0 in the ACR, the differential
VREF must not exceed 1.25V.
For AVDD = 3.0V and RANGE = 1 in the ACR, the differential
VREF must not exceed 2.5V.
CLOCK GENERATOR
The clock source for the ADS1240 and ADS1241 can be
provided from a crystal, oscillator, or external clock. When the
clock source is a crystal, external capacitors must be provided
to ensure start-up and stable clock frequency. This is shown in
both Figure 5 and Table II. XOUT is only for use with external
crystals and it should not be used as a clock driver for external
circuitry.
FIGURE 5. Crystal Connection.
CLOCK
PART
SOURCE
FREQUENCY
C1
C2
NUMBER
Crystal
2.4576
0-20pF
ECS, ECSD 2.45 - 32
Crystal
4.9152
0-20pF
ECS, ECSL 4.91
Crystal
4.9152
0-20pF
ECS, ECSD 4.91
Crystal
4.9152
0-20pF
CTS, MP 042 4M9182
TABLE II. Recommended Crystals.
DIGITAL FILTER
The ADS1240 and ADS1241 have a 1279 tap linear phase
Finite Impulse Response (FIR) digital filter that a user can
configure for various output data rates. When a 2.4576MHz
crystal is used, the device can be programmed for an output
data rate of 15Hz, 7.5Hz, or 3.75Hz. Under these conditions,
the digital filter rejects both 50Hz and 60Hz interference. Figure
6 shows the digital filter frequency response for data output
rates of 15Hz, 7.5Hz, and 3.75Hz.
If a different data output rate is desired, a different crystal
frequency can be used. However, the rejection frequencies
shift accordingly. For example, a 3.6864MHz master clock with
the default register condition has:
(3.6864MHz/2.4576MHz) 15Hz = 22.5Hz data output rate
and the first and second notch is:
1.5 (50Hz and 60Hz) = 75Hz and 90Hz
DATA I/O INTERFACE
The ADS1240 has four pins and the ADS1241 has eight pins
that serve a dual purpose as both analog inputs and data
I/O. These pins are powered from AVDD and are configured
through the IOCON, DIR, and DIO registers. These pins
can be individually configured as either analog inputs or data
I/O. See Figure 7 (page 14) for the equivalent schematic of
an Analog/Data I/O pin.
The IOCON register defines the pin as either an analog input
or data I/O. The power-up state is an analog input. If the pin
is configured as an analog input in the IOCON register, the
DIR and DIO registers have no effect on the state of the pin.
If the pin is configured as data I/O in the IOCON register,
then DIR and DIO are used to control the state of the pin.
The DIR register controls the direction of the data pin, either
as an input or output. If the pin is configured as an input in
the DIR register, then the corresponding DIO register bit
reflects the state of the pin. Make sure the pin is driven to a
C
1
Crystal
X
IN
X
OUT
C
2
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| ADS1241EG4 | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 24-Bit Anlg-to-Dig Converter 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 |
| ADS1241EVM | 功能描述:EVAL MODULE FOR ADS1241 RoHS:是 類別:編程器，開發(fā)系統(tǒng) >> 評(píng)估板 - 模數(shù)轉(zhuǎn)換器 (ADC) 系列:- 產(chǎn)品培訓(xùn)模塊:Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:1 系列:- ADC 的數(shù)量:1 位數(shù):12 采樣率（每秒）:94.4k 數(shù)據(jù)接口:USB 輸入范圍:±VREF/2 在以下條件下的電源（標(biāo)準(zhǔn)）:- 工作溫度:-40°C ~ 85°C 已用 IC / 零件:MAX11645 已供物品:板，軟件 |
| ADS1241-EVM | 制造商:TI 制造商全稱:Texas Instruments 功能描述:24-Bit ANALOG-TO-DIGITAL CONVERTER |
| ADS1241MEVM | 功能描述:數(shù)據(jù)轉(zhuǎn)換 IC 開發(fā)工具 ADS1241MEVM Eval Mod RoHS:否 制造商:Texas Instruments 產(chǎn)品:Demonstration Kits 類型:ADC 工具用于評(píng)估:ADS130E08 接口類型:SPI 工作電源電壓:- 6 V to + 6 V |
| ADS1242 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:24-Bit ANALOG-TO-DIGITAL CONVERTER |
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