参数资料
| 型号： | ADS1259BIPWR |
| 厂商： | Texas Instruments |
| 文件页数： | 7/48页 |
| 文件大小： | 0K |
| 描述： | IC ADC 24BIT SPI 14KSPS 20TSSOP |
| 标准包装： | 2,000 |
| 位数： | 24 |
| 采样率（每秒）： | 14k |
| 数据接口： | 串行，SPI? |
| 转换器数目： | 1 |
| 电压电源： | 模拟和数字，双 ± |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 20-TSSOP（0.173"，4.40mm 宽） |
| 供应商设备封装： | 20-TSSOP |
| 包装： | 带卷 (TR) |
| 输入数目和类型： | 2 个单端，单极；2 个单端，双极；1 个差分，单极；1 个差分，双极 |
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t
SAMPLE
MOD
=1/f
ON
OFF
S
1
S
2
OFF
ON
S
1
S
1
AVSS+2.5V
R
=R
||2R
=120k
R
=R
=500k
W
COM
EFFA
DIFF
EFFB
EFFA
AVSS+2.5V
R
=500kW
EFFA
R
=130kW
EFFB
(f
=0.9216MHz)
MOD
R
=500kW
EFFA
AINN
AINP
C
=2pF
A1
C =8pF
B
C
=2pF
A2
S
2
AVSS+2.5V
S
2
AVSS+2.5V
AINN
AINP
Equivalent
Circuit
AVDD
AVSS
R
=
EFF
f
C
MOD
X
1
ESDDiodes
andf
=f
/8
CLK
MOD
SBAS424D
– JUNE 2009 – REVISED AUGUST 2011
ANALOG INPUTS (AINP, AINN)
ESD diodes protect the analog inputs. To keep these
diodes from turning on, make sure the voltages on
The ADS1259 measures the differential input signal
the input pins do not go below AVSS by more than
VIN = (AINP – AINN) against the differential reference
300mV, and likewise do not exceed AVDD by more
VREF = (VREFP – VREFN) using internal capacitors
than 300mV.
that
are
continuously
charged
and
discharged.
Figure 37 shows the simplified schematic of the ADC
AVSS
– 300mV < (AINP or AINN) < AVDD + 300mV.
input circuitry; the right side of the figure illustrates
Note that the valid input range is:
the input circuitry with the capacitors and switches
replaced
by
an
equivalent
circuit.
AVSS
– 100mV < (AINP or AINN) < AVDD + 100mV
demonstrates the ON/OFF timings for the switches of
sampling phase. With switch S1 closed, CA1 charges
to AINP, CA2 charges to AINN, and CB charges to
(AINP
– AINN). For the discharge phase, S1 opens
first and then S2 closes. CA1 and CA2 discharge to
approximately to AVSS + 2.5V and CB discharges to
0V. This two-phase sample/discharge cycle repeats
with a period of tSAMPLE = 1/fMOD. fMOD is the operating
frequency of the modulator, where fMOD = fCLK/8.
Although
optimized
for
differential
signals,
the
The charging of the input sampling capacitors draws
ADS1259 inputs may be driven with a single-ended
a transient current from the source driving the
signal by fixing one input to AVSS or mid-supply. Full
ADS1259 ADC inputs. The average value of this
dynamic range is achieved when the inputs are
current can be used to calculate an effective
differentially driven
±VREF.
impedance (REFF) where REFF = VIN/IAVERAGE. These
impedances scale inversely with fMOD. For example, if
As a result of the switched-capacitor input structure of
fMOD is reduced by a factor of two, the impedances
the ADS1259, a buffer is recommended to drive the
double. Note that the sampling capacitors can vary
analog inputs. An input filter comprised of 20
to 50Ω
±15% over production lots and typically vary 1% with
resistors and 10nF capacitors should be used
temperature.
The
variations
of
the
sampling
between the buffer and the ADS1259 inputs.
capacitors have a corresponding effect on the analog
input impedance.
Figure 37. Simplified ADC Input Structure
Copyright
2009–2011, Texas Instruments Incorporated
15
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相关代理商/技术参数 |
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|---|---|
| ADS1259EVM | 功能描述:数据转换 IC 开发工具 ADS1259 Eval Mod RoHS:否 制造商:Texas Instruments 产品:Demonstration Kits 类型:ADC 工具用于评估:ADS130E08 接口类型:SPI 工作电源电压:- 6 V to + 6 V |
| ADS1259EVM | 制造商:Texas Instruments 功能描述:DEVELOPMENT TOOL |
| ADS1259EVM-PDK | 功能描述:数据转换 IC 开发工具 ADS1259 Perf Demo Kit RoHS:否 制造商:Texas Instruments 产品:Demonstration Kits 类型:ADC 工具用于评估:ADS130E08 接口类型:SPI 工作电源电压:- 6 V to + 6 V |
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