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| 型号： | ADS1241MEVM |
| 厂商： | Texas Instruments |
| 文件页数： | 15/30页 |
| 文件大小： | 0K |
| 描述： | EVALUATION MODULE FOR ADS1241M |
| 产品培训模块： | Data Converter Basics |
| 视频文件： | Nuts and Bolts of the Delta-Sigma Converter |
| 标准包装： | 1 |
| ADC 的数量： | 1 |
| 位数： | 24 |
| 采样率（每秒）： | 15 |
| 数据接口： | SPI? |
| 输入范围： | 0 ~ 2.5 V |
| 在以下条件下的电源（标准）： | 0.6mW @ 3V |
| 工作温度： | -40°C ~ 85°C |
| 已用 IC / 零件： | ADS1241M |
| 已供物品： | 板 |
| 产品目录页面： | 889 (CN2011-ZH PDF) |
| 相关产品： | ADS1241EG4-ND - IC ADC 24-BIT SER PROGBL 28-SSOP ADS1241E/1KG4-ND - IC ADC 24-BIT SER PROGBL 28-SSOP 296-25895-2-ND - IC ADC 24-BIT SER PROGBL 28-SSOP ADS1241E-ND - IC ADC 24-BIT SER PROGBL 28-SSOP |
| 其它名称： | 296-18358 |
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ADS1240, 1241
22
SBAS173F
www.ti.com
DEFINITION OF TERMS
An attempt has been made to be consistent with the termi-
nology used in this data sheet. In that regard, the definition
of each term is given as follows:
Analog Input Voltage—the voltage at any one analog input
relative to AGND.
Analog Input Differential Voltage—given by the following
equation: (IN+) – (IN–). Thus, a positive digital output is
produced whenever the analog input differential voltage is
positive, while a negative digital output is produced whenever
the differential is negative.
For example, when the converter is configured with a 2.5V
reference and placed in a gain setting of 1, the positive
full-scale output is produced when the analog input differen-
tial is 2.5V. The negative full-scale output is produced when
the differential is –2.5V. In each case, the actual input
voltages must remain within the AGND to AVDD range.
Conversion Cycle—the term
conversion cycle usually refers
to a discrete A/D conversion operation, such as that per-
formed by a successive approximation converter. As used
here, a conversion cycle refers to the tDATA time period.
Data Rate—The rate at which conversions are completed.
See definition for fDATA.
f
DATA
OSC
SPEED
DR
=
128 2
1280 2
SPEED = 0, 1
DR = 0, 1, 2
fOSC—the frequency of the crystal oscillator or CMOS com-
patible input signal at the XIN input of the ADS1240 and
ADS1241.
fMOD—the frequency or speed at which the modulator of the
ADS1240 and ADS1241 is running. This depends on the
SPEED bit as given by the following equation:
f
mfactor
SAMP
OSC
=
8
f
mfactor
SAMP
OSC
=
4
f
mfactor
SAMP
OSC
=
2
f
mfactor
SAMP
OSC
=
PGA SETTING
SAMPLING FREQUENCY
1, 2, 4, 8
16
32
64, 128
SPEED = 0
SPEED = 1
mfactor
128
256
pling capacitor. The value is given by one of the following
equations:
fDATA—the frequency of the digital output data produced by
the ADS1240 and ADS1241, fDATA is also referred to as the
Data Rate.
Full-Scale Range (FSR)—as with most A/D converters, the
full-scale range of the ADS1240 and ADS1241 is defined as
the input, that produces the positive full-scale digital output
minus the input, that produces the negative full-scale digital
output.
For example, when the converter is configured with a 2.5V
reference and is placed in a gain setting of 2, the full-scale
range is: [1.25V (positive full-scale) minus –1.25V (negative
full-scale)] = 2.5V.
Least Significant Bit (LSB) Weight—this is the theoretical
amount of voltage that the differential voltage at the analog
input has to change in order to observe a change in the
output data of one least significant bit. It is computed as
follows:
LSB Weight
Full Scale Range
N
=
21
–
where N is the number of bits in the digital output.
tDATA—the inverse of fDATA, or the period between each data
output.
5V SUPPLY ANALOG INPUT(1)
GENERAL EQUATIONS
DIFFERENTIAL
PGA OFFSET
FULL-SCALE
DIFFERENTIAL
PGA SHIFT
GAIN SETTING
FULL-SCALE RANGE
INPUT VOLTAGES(2)
RANGE
INPUT VOLTAGES(2)
RANGE
15V
±2.5V
±1.25V
22.5V
±1.25V
±0.625V
4
1.25V
±0.625V
±312.5mV
8
0.625V
±312.5mV
±156.25mV
16
312.5mV
±156.25mV
±78.125mV
32
156.25mV
±78.125mV
±39.0625mV
64
78.125mV
±39.0625mV
±19.531mV
128
39.0625mV
±19.531mV
±9.766mV
NOTES: (1) With a 2.5V reference. (2) Refer to electrical specification for analog input voltage range.
TABLE VI. Full-Scale Range versus PGA Setting.
2
V
PGA
REF
±V
PGA
REF
±
V
PGA
REF
2
RANGE = 0
RANGE = 1
V
PGA
REF
±
V
PGA
REF
2
±
V
PGA
REF
4
f
mfactor
f
MOD
OSC
SPEED
==
128 2
fSAMP—the frequency, or switching speed, of the input sam-
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