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参数资料
| 型号： | MAX191ACWG+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 13/24页 |
| 文件大小： | 0K |
| 描述： | IC ADC 12BIT 100KSPS 24-SOIC |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 1,000 |
| 位数： | 12 |
| 采样率（每秒）： | 100k |
| 数据接口： | MICROWIRE?，并联，QSPI?，串行，SPI? |
| 转换器数目： | 1 |
| 功率耗散（最大）： | 941mW |
| 电压电源： | 双 ± |
| 工作温度： | 0°C ~ 70°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 24-SOIC（0.295"，7.50mm 宽） |
| 供应商设备封装： | 24-SOIC W |
| 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 |
MAX191
between FFE (hex) and FFF (hex). Because interaction
occurs between adjustments, offset should be adjusted
before gain. For an input gain of two, remove R7 and R8.
The MAX191 accepts input voltages from AGND to VDD
while operating from a single supply, and VSS to VDD
when operating from dual supplies. Figure 22 shows
the bipolar input transfer function with AIN- connected
to midscale for single-supply operation and connected
to GND operating from dual supplies. When operating
from a single supply, the MAX191 can be configured
for bipolar operation on its pseudo-differential input.
Instead of using AIN- as an analog input return, AIN-
can be set to a different positive potential voltage
above ground (BIP pin is set high). The sampled ana-
log input (AIN+) can swing to any positive voltage
above and below AIN-, and the ADC performs bipolar
conversions with respect to AIN-. When operating from
dual supplies, the MAX191 full-scale range is from
-VREF/2 to +VREF/2.
Digital Bus Noise
If the data bus connected to the ADC is active during a
conversion, crosstalk from the data pins to the ADC
comparator may generate errors. Slow-memory mode
avoids this problem by placing the P in a wait state
during the conversion. In ROM mode, if the data bus is
active during the conversion, it should be isolated from
the ADC using three-state drivers.
The ADC generates considerable digital noise in ROM
mode when RD or CS go high and the output data dri-
vers are disabled after a conversion has started. This
noise can cause large errors if it occurs when the SAR
latches a comparator decision. To avoid this problem,
RD and CS should be active for less than one clock
cycle. If this is not possible, RD or CS should go high at
the rising edge of CLK, since the comparator output is
always latched on falling edges of CLK.
Layout, Grounding, Bypassing
Use printed circuit boards for best system performance.
Low-Power, 12-Bit Sampling ADC
with Internal Reference and Power-Down
20
______________________________________________________________________________________
RD
0
OPEN CIRCUIT (FLOAT)
PD
12.5
s
2ms
VREF
200ms
Figure 19b. Low Average-Power Mode Operation (External
Compensation)
11 . . . 111
11 . . . 110
11 . . . 101
00 . . . 011
00 . . . 010
00 . . . 001
00 . . . 000
0
1
2
3
FS
FS–1LSB
OUTPUT
CODE
FULL-SCALE
TRANSITION
FS = VREF
1LSB =
4096
FS
AIN INPUT VOLTAGE (LSB)
Figure 20. Unipolar Transfer Function
VIN
R3
10k
R1
100
R2
49.9
R4
10k
TO AIN+
MAX480
Figure 21a. Trim Circuit for Gain (±0.5%)
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX191AENG | 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 |
| MAX191AENG+ | 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 |
| MAX191AEWG | 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 |
| MAX191AEWG+ | 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 |
| MAX191AEWG+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 |
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