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| 型号： | CS5521-ASZR |
| 厂商： | Cirrus Logic Inc |
| 文件页数： | 7/56页 |
| 文件大小： | 0K |
| 描述： | IC ADC 16BIT 2CH 20-SSOP |
| 标准包装： | 1,000 |
| 位数： | 16 |
| 数据接口： | 串行 |
| 转换器数目： | 1 |
| 功率耗散（最大）： | 10mW |
| 电压电源： | 模拟和数字 |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 20-SSOP（0.209"，5.30mm 宽） |
| 供应商设备封装： | 20-SSOP |
| 包装： | 带卷 (TR) |
| 输入数目和类型： | 2 个差分，单极；2 个差分，双极 |
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CS5521/22/23/24/28
DS317F8
15
1.1.3 Analog Input Span Considerations
The CS5521/22/23/24/28 is designed to measure
full-scale ranges of 25 mV, 55 mV, 100 mV, 1 V,
2.5 V, and 5 V. Other full scale values can be ac-
commodated by performing a system calibration
within the limits specified. See the Calibration sec-
tion for more details. Another way to change the
full scale range is to increase or to decrease the
voltage reference to a voltage other than 2.5 . See
the Voltage Reference section for more details.
Three factors set the operating limits for the input
span. They include: instrumentation amplifier satu-
ration, modulator 1’s density, and a lower reference
voltage. When the 25 mV, 55 mV, or 100 mV
range is selected, the input signal (including the
common-mode voltage and the amplifier offset
voltage) must not cause the 20X amplifier to satu-
rate in either its input stage or output stage. To pre-
vent saturation, the absolute voltages on AIN+ and
AIN- must stay within the limits specified (refer to
the Analog Input section). Additionally, the differ-
ential output voltage of the amplifier must not ex-
ceed 2.8 V. The equation
ABS(VIN + VOS) x 20 = 2.8 V
defines the differential output limit, where
VIN = (AIN+) - (AIN-)
is the differential input voltage and VOS is the ab-
solute maximum offset voltage for the instrumenta-
tion amplifier (VOS will not exceed 40 mV). If the
differential output voltage from the amplifier ex-
ceeds 2.8 V, the amplifier may saturate, which will
cause a measurement error.
The input voltage into the modulator must not
cause the modulator to exceed a low of 20 percent
or a high of 80 percent 1's density. The nominal
full-scale input span of the modulator (from 30 per-
cent to 70 percent 1’s density) is determined by the
VREF voltage divided by the Gain Factor. See
Table 1 to determine if the CS5521/22/23/24/28 is
being used properly.
For example, in the 55 mV
range, to determine the nominal input voltage to the
modulator, divide VREF (2.5 V) by the Gain Fac-
tor (2.2727).
When a smaller voltage reference is used, the re-
sulting code widths are smaller causing the con-
verter output codes to exhibit more changing codes
for a fixed amount of noise. Table 1 is based upon
a VREF = 2.5 V. For other values of VREF, the
values in Table 1 must be scaled accordingly.
1.1.4 Measuring Voltages Higher than 5 V
Some systems require the measurement of voltages
greater than 5 V. The input current of the instru-
Note:
1. The converter's actual input range, the delta-sigma's nominal full-scale input, and the delta-sigma's
maximum full-scale input all scale directly with the value of the voltage reference. The values in the
table assume a 2.5 V VREF voltage.
2. The 2.8 V limit at the output of the 20X amplifier is the differential output voltage.
Input Range(1)
Max. Differential Output
20X Amplifier
VREF
Gain Factor
Δ-Σ Nominal(1)
Differential Input
Δ-Σ(1)
Max. Input
± 25 mV
2.8 V (2)
2.5V
5
± 0.5 V
± 0.75 V
± 55 mV
2.8 V (2)
2.5V
2.272727...
± 1.1 V
± 1.65 V
± 100 mV
2.8 V (2)
2.5V
1.25
± 2.0 V
± 3.0 V
± 1.0 V
-
2.5V
2.5
± 1.0 V
± 1.5 V
± 2.5 V
-
2.5V
1.0
± 2.5 V
± 5.0 V
-
2.5V
0.5
± 5.0 V
0V, VA+
Table 1. Relationship between Full Scale Input, Gain Factors, and Internal Analog
Signal Limitations
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相关代理商/技术参数 |
参数描述 |
|---|---|
| CS5522 | 制造商:CIRRUS 制造商全称:Cirrus Logic 功能描述:16-bit or 24-bit, 2/4/8-channel ADCs with PGIA |
| CS5522-AP | 功能描述:模数转换器 - ADC 2-Ch 24-Bit Delta Sigma ADC RoHS:否 制造商:Texas Instruments 通道数量:2 结构:Sigma-Delta 转换速率:125 SPs to 8 KSPs 分辨率:24 bit 输入类型:Differential 信噪比:107 dB 接口类型:SPI 工作电源电压:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-32 |
| CS5522-AS | 功能描述:模数转换器 - ADC 2-Ch 24-Bit Delta Sigma ADC RoHS:否 制造商:Texas Instruments 通道数量:2 结构:Sigma-Delta 转换速率:125 SPs to 8 KSPs 分辨率:24 bit 输入类型:Differential 信噪比:107 dB 接口类型:SPI 工作电源电压:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-32 |
| CS5522-ASZ | 功能描述:模数转换器 - ADC 2-Ch 24-Bit Delta Sigma ADC RoHS:否 制造商:Texas Instruments 通道数量:2 结构:Sigma-Delta 转换速率:125 SPs to 8 KSPs 分辨率:24 bit 输入类型:Differential 信噪比:107 dB 接口类型:SPI 工作电源电压:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-32 |
| CS5522-ASZR | 功能描述:模数转换器 - ADC IC 2-Chl 16Bit Bffrd Dlt Sgm Mlt-Rng ADC RoHS:否 制造商:Texas Instruments 通道数量:2 结构:Sigma-Delta 转换速率:125 SPs to 8 KSPs 分辨率:24 bit 输入类型:Differential 信噪比:107 dB 接口类型:SPI 工作电源电压:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-32 |
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