参数资料
| 型号： | MAX1494CCJ+T |
| 厂商： | Maxim Integrated |
| 文件页数： | 14/34页 |
| 文件大小： | 0K |
| 描述： | IC ADC W/LCD DRIVER 32-TQFP |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,000 |
| 显示器类型： | LCD |
| 配置： | 7 段 + 2 个信号器 |
| 接口： | 串行 |
| 数字或字符： | A/D，4.5 位数字 |
| 电流 - 电源： | 960µA |
| 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： | 32-LQFP |
| 供应商设备封装： | 32-LQFP（7x7） |
| 包装： | 带卷 (TR) |
第1页第2页第3页第4页第5页第6页第7页第8页第9页第10页第11页第12页第13页当前第14页第15页第16页第17页第18页第19页第20页第21页第22页第23页第24页第25页第26页第27页第28页第29页第30页第31页第32页第33页第34页
3.5- and 4.5-Digit, Single-Chip ADCs
with LCD Drivers
Table 2. Decimal-Point Control Table (MAX1494)
DP_EN
0
0
0
0
1
1
1
1
DPSET1
0
0
1
1
0
0
1
1
DPSET2
0
1
0
1
0
1
0
1
DISPLAY OUTPUT
18888
18888
18888
18888
1 8 8 8.8
1 8 8.8 8
1 8.8 8 8
1.8 8 8 8
ZERO INPUT READING
0
0
0
0
0.0
0.00
0.000
0.0000
Table 3. Decimal-Point Control Table (MAX1492)
DP_EN
X
X
X
X
DPSET1
0
0
1
1
DPSET2
0
1
0
1
DISPLAY OUTPUT
1 8 8.8
1 8.8 8
1.8 8 8
1888
ZERO INPUT READING
0.0
0.00
0.000
000
X = Don’t care.
Table 4. LCD During Overrange and
Underrange Conditions
The MAX1492/MAX1494 overrange and underrange
display is shown in Table 4.
Reference
CONDITION
OVERRANGE
UNDERRANGE
MAX1492
1– – –
-1– – –
MAX1494
1– – – –
-1– – – –
The MAX1492/MAX1494 reference sets the full-scale
range of the ADC transfer function. With a nominal
2.048V reference, the ADC full-scale range is ±2V with
the RANGE bit equal to 0. With the RANGE bit set to 1,
the full-scale range is ±200mV. A decreased reference
voltage decreases full-scale range (see the Transfer
X
Y
Z
Functions section).
The MAX1492/MAX1494 accept either an external ref-
BP1
f
a
b
erence or an internal reference. The INTREF bit selects
the reference mode (see the Control Register
(Read/Write) section).
BP2
e
g
c
For internal-reference operation, set INTREF to 1, con-
nect REF- to GND and bypass REF+ to GND with a
BP3
DP
d
DP
4.7μF capacitor. The internal reference provides a nom-
inal 2.048V source between REF+ and GND. The inter-
nal-reference temperature coefficient is typically
40ppm/°C.
Figure 8. Schematic of Display Digit
The MAX1492/MAX1494 allow for full decimal-point con-
trol and feature leading zero suppression. Use the
DP_EN, DPSET1, and DPSET2 bits in the control register
to set the value of the decimal point. Tables 2 and 3 show
the truth tables of the DP_EN, DPSET1, and DPSET2. The
truth tables determine decimal-point usage.
The default power-on state sets the MAX1492/
MAX1494 to use the external reference with INTREF
cleared to 0. The external reference inputs, REF+ and
REF-, are fully differential. For a valid external-reference
input, V REF+ must be greater than V REF- . Bypass REF+
and REF- with a 0.1μF or greater capacitor to GND in
external-reference mode.
14
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