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参数资料
| 型号： | MAX1491CAI+ |
| 厂商： | Maxim Integrated |
| 文件页数： | 10/25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
Internal Clock
The MAX1491/MAX1493/MAX1495 contain an internal
oscillator. Using the internal oscillator saves board
X
Y
Z
space by removing the need for an external clock
source. The oscillator is optimized to give 50Hz and
60Hz power supply and common-mode rejection.
Charge Pump
a
a
The MAX1491/MAX1493/MAX1495 contain an internal
f
b
BP1
f
b
charge pump to provide the negative supply voltage for
the internal analog input/reference buffers. The bipolar
input range of the analog input/reference buffers allows
g
g
the devices to accept negative inputs with high source
e
c
BP2
e
c
impedances. For the charge pump to operate correctly,
connect a 0.1μF capacitor from VNEG to GND.
LCD Driver
DP
d
ANNUNCIATOR
d
The MAX1491/MAX1493/MAX1495 contain the neces-
sary backplane and segment driver outputs to drive
3.5-digit (MAX1491) and 4.5-digit (MAX1493/MAX1495)
BP3
DP
ANNUNCIATOR
LCDs. The LCD update rate is 2.5Hz. Figures 4–7 show
the connection schemes for a standard LCD. The
MAX1491/MAX1493/MAX1495 automatically display the
Figure 3. Connection Diagrams for Typical Seven-Segment
Displays
results of the ADC.
with BP2 to form the g segment, and with BP3 to form
Triplexing
An internal resistor string of three equal-value resistors
(52k ? , 1% matching) is used to generate the display
drive voltages. One end of the string is connected to
DV DD and the other end is connected to GND. Note that
V LCD (V LCD = DV DD - GND) should be three times the
threshold voltage for the liquid-crystal material used.
The connection diagram for a typical 7-segment display
font with two annunciators is illustrated in Figure 3 and
Figure 8. The MAX1491/MAX1493/MAX1495 numeric
display drivers (4.5 digits, 3.5 digits) use this configura-
tion to drive a triplexed LCD with three backplanes and
13 segment driver lines (10 for 3.5 digits). Figures 4 and
5 show the assignment of the 4.5-digit display segments
and Figures 6 and 7 show the assignment of the 3.5-
digit display segments.
The voltage waveforms of the backplane lines and y
segment line (Figure 3) have been chosen as an exam-
ple. This line intersects with BP1 to form the a segment,
Table 1. List of LCD Manufacturers
the d segment. Eight different ON/OFF combinations of
the a, g, and d segments and their corresponding
waveforms of the y segment line are illustrated in
Figures 9 and 10. The schematic diagram in Figure 8
shows that each intersection acts as a capacitance
from segment line to common line. Figure 11 illustrates
the voltage across the g segment.
The RMS voltage across the segment determines the
degree of polarization for the liquid-crystal material and
thus the contrast of the segment. The RMS OFF voltage
is always V LCD / 3, whereas the RMS ON voltage is
always 1.92V LCD / 3. This is illustrated in Figure 11. The
ratio of RMS ON to OFF voltage is fixed at 1.92 for a
triplexed LCD.
Figure 12 illustrates contrast vs. applied RMS voltage
with a V LCD of 3.1V. The RMS ON voltage is 2.1V and
the RMS OFF voltage is 1.1V. The OFF segment has a
contrast of less than 5%, while the ON segments have
greater than 85% contrast.
MANUFACTURER
DCI, Inc.
WEBSITE
www.dciincorporated.com
PART NUMBER
04-0924-00
04-0924-01
04-0925-00
04-0925-01
DESCRIPTION
3.5 digit, 5V
3.5 digit, 3V
4.5 digit, 5V
4.5 digit, 3V
The following site has links to other custom LCD manufacturers: www.earthlcd.com/mfr.htm
10
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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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