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| 型号： | MAX1491CAI+ |
| 厂商： | Maxim Integrated |
| 文件页数： | 9/25页 |
| 文件大小： | 0K |
| 描述： | IC ADC 3.5 DGT LCD DVR 28-SSOP |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 46 |
| 显示器类型： | LCD |
| 配置： | 7 段 + 2 个信号器 |
| 数字或字符： | A/D，3.5 位数字 |
| 电流 - 电源： | 980µA |
| 电源电压： | 2.7 V ~ 5.25 V |
| 工作温度： | 0°C ~ 70°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 28-SSOP（0.209"，5.30mm 宽） |
| 供应商设备封装： | 28-SSOP |
| 包装： | 管件 |
| 产品目录页面： | 1397 (CN2011-ZH PDF) |
3.5- and 4.5-Digit, Single-Chip
ADCs with LCD Drivers
Detailed Description
The MAX1491/MAX1493/MAX1495 low-power, highly
integrated ADCs with LCD drivers convert a ±2V differ-
ential input voltage (one count is equal to 100μV for the
MAX1493/MAX1495 and 1mV for the MAX1491) with a
sigma-delta ADC and output the result to an LCD. An
additional ±200mV input range (one count is equal to
10μV for the MAX1493/MAX1495 and 100μV for the
Digital Filtering
The MAX1491/MAX1493/MAX1495 contain an on-chip
digital lowpass filter that processes the data stream
from the modulator using a SINC4 (sinx/x) 4 response.
The SINC 4 filter has a settling time of four output data
periods (4 x 200ms).
The MAX1491/MAX1493/MAX1495 have 25% overrange
capability built into the modulator and digital filter:
sin ? N π
f m ? ? ?
?
f ? ??
sin ? π
? f m ? ? ?
MAX1491) is available to measure small signals with
increased resolution.
These devices operate from a single 2.7V to 5.25V power
supply and offer 3.5-digit (MAX1491) or 4.5-digit
(MAX1493/MAX1495) conversion results. An internal
2.048V reference, internal charge pump and a high-accu-
?
?
H ( f ) = ??
?
? ?
1
N
?
? f ? ?
?
?
4
( )
? 1 1 - z
( )
? N 1 - z
?
racy on-chip oscillator eliminate external components.
These devices also feature on-chip buffers for the dif-
ferential input signal and external reference inputs,
allowing direct interface with high-impedance signal
sources. In addition, they use continuous internal offset
? -N
H ( z ) = ? - 1
?
?
?
?
?
4
calibration, and offer >100dB of 50Hz and 60Hz line
noise rejection. Other features include data hold and
peak hold, and a low-battery monitor. The MAX1495
also performs enhanced offset calibration on demand.
Analog Input Protection
Internal protection diodes limit the analog input range
from V NEG to (AV DD + 0.3V). If the analog input
exceeds this range, limit the input current to 10mA.
Internal Analog Input/
Reference Buffers
The MAX1491/MAX1493/MAX1495 analog input/refer-
ence buffers allow the use of high-impedance signal
sources. The input buffers’ common-mode input range
allows the analog inputs and reference to range from
-2.2V to +2.2V.
Modulator
The MAX1491/MAX1493/MAX1495 perform analog-to-
digital conversions using a single-bit, 3rd-order, sigma-
delta modulator. The sigma-delta modulation converts
the input signal into a digital pulse train whose average
duty cycle represents the digitized signal information.
The modulator quantizes the input signal at a much
higher sample rate than the bandwidth of the input.
The MAX1491/MAX1493/MAX1495 modulator provides
3rd-order frequency shaping of the quantization noise
resulting from the single-bit quantizer. The modulator is
Filter Characteristics
Figure 2 shows the filter frequency response. The SINC 4
characteristic -3dB cutoff frequency is 0.228 times the
first notch frequency (5Hz). The oversampling ratio
(OSR) for the MAX1491 is 128 and the OSR for the
MAX1493/MAX1495 is 1024.
The output data rate for the digital filter corresponds
with the positioning of the first notch of the filter’s fre-
quency response. The notches of the SINC 4 filter are
repeated at multiples of the first notch frequency. The
SINC 4 filter provides an attenuation of better than
100dB at these notches. For example, 50Hz is equal to
10 times the first notch frequency and 60Hz is equal to
12 times the first notch frequency.
0
-40
-80
-120
-160
fully differential for maximum signal-to-noise ratio and
minimum susceptibility to power-supply noise. A single-
bit data stream is then presented to the digital filter for
-200
0
10
20 30 40
FREQUENCY (Hz)
50
60
processing, to remove the frequency-shaped quantiza-
tion noise.
Figure 2. Frequency Response of the SINC 4 Filter (Notch at 60Hz)
_______________________________________________________________________________________
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX1491CAI+ | 功能描述:模数转换器 - ADC 3.5 Digit ADC w/LCD Drivers 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 |
| MAX1491CAI+T | 功能描述:模数转换器 - ADC 3.5 Digit ADC w/LCD Drivers 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 |
| MAX1491CAI-T | 功能描述:模数转换器 - 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 |
| MAX1491CNI | 功能描述:模数转换器 - 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 |
| MAX1491CNI+ | 功能描述:模数转换器 - ADC 3.5 Digit ADC w/LCD Drivers 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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