参数资料
型号: MAX1497EAI+T
厂商: Maxim Integrated Products
文件页数: 19/33页
文件大小: 0K
描述: IC ADC 3 1/2DIG W/LED DVR 28-SSO
产品培训模块: Lead (SnPb) Finish for COTS
Obsolescence Mitigation Program
标准包装: 2,000
位数: 3.5 位
采样率(每秒): 5
数据接口: MICROWIRE?,QSPI?,串行,SPI?
转换器数目: 1
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: 28-SSOP(0.209",5.30mm 宽)
供应商设备封装: 28-SSOP
包装: 带卷 (TR)
输入数目和类型: 1 个差分,双极
MAX1497/MAX1499
3.5- and 4.5-Digit, Single-Chip ADCs with LED
Drivers and C Interface
26
______________________________________________________________________________________
Thermocouple Measurement
Figure 16 shows a connection from a thermocouple to
the MAX1497/MAX1499. In this application, the
MAX1497/MAX1499 take advantage of the on-chip
input buffers that allow large source impedances on the
front end. The decoupling capacitors reduce noise
pickup from the thermocouple leads. To place the dif-
ferential voltage from the thermocouple at a suitable
common-mode voltage, the AIN- input of the MAX1497/
MAX1499 is biased to GND. Use an external tempera-
ture sensor, such as the DS75, and a C to perform
cold-junction temperature compensation.
Transfer Functions
Figures 17–20 show the transfer functions of the
MAX1497/MAX1499. The output data is stored in the
ADC data register in two’s complement.
The transfer function for the MAX1499 with AIN+ - AIN-
≥ 0, RANGE = 0 is:
COUNTS
VV
AIN
REF
.
,
=
×
+
1 024
20 000
7CFh
002h
001h
000h
FFFh
FFEh
FFDh
830h
<830h
-200mV
0
ANALOG INPUT VOLTAGE
+200mV
ADC RESULT
LED
1 - - -
1999
2
1
0
- 0
- 1
- 2
-1999
- 1 - - -
-100V 100V
Figure 19. MAX1497 Transfer Function, ±200mV Range
>7CFh
7CFh
002h
001h
000h
FFFh
FFEh
FFDh
830h
<830h
-2V
0
ANALOG INPUT VOLTAGE
+2V
ADC RESULT
LED
1 - - -
1999
2
1
0
- 0
- 1
- 2
-1999
- 1 - - -
-1mV
1mV
Figure 20. MAX1497 Transfer Function, ±2V Range
>4E1Fh
4E1Fh
0002h
0001h
0000h
FFFFh
FFFEh
FFFDh
B1E0h
<B1E0h
-2V
0
ANALOG INPUT VOLTAGE
+2V
ADC RESULT
LED
1 - - - -
19,999
2
1
0
- 0
- 1
- 2
-19,999
- 1 - - - -
-100V 100V
Figure 17. MAX1499 Transfer Function, ±2V Range
4E1Fh
0002h
00001h
0000h
FFFFh
FFFEh
FFFDh
B1E0h
<B1E0h
-200mV
0
ANALOG INPUT VOLTAGE
+200mV
ADC RESULT
LED
1 - - - -
19,999
2
1
0
- 0
- 1
- 2
-19,999
- 1 - - - -
-10V
10V
Figure 18. MAX1499 Transfer Function, ±200mV Range
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