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參數(shù)資料
| 型號： | MAX1478 |
| 廠商： | Maxim Integrated Products, Inc. |
| 英文描述： | 1% Accurate, Digitally Trimmed,Rail-to-Rail Sensor Signal Conditioner |
| 中文描述： | 1%精確度、數(shù)字校準、滿擺幅傳感器信號調(diào)理器 |
| 文件頁數(shù)： | 4/20頁 |
| 文件大?。?/td> | 210K |
| 代理商： | MAX1478 |
_______________Detailed Description
The MAX1478 provides an analog amplification path for
the sensor signal. Calibration and temperature com-
pensation are achieved by varying the offset and gain
of a programmable-gain amplifier (PGA) and by varying
the sensor bridge current. The PGA uses a switched-
capacitor CMOS technology, with an input-referred
coarse offset trimming range of approximately ±63mV
(9mV steps). An additional output-referred fine offset
trim is provided by the Offset DAC (approximately
2.8mV steps). The PGA provides eight gain values from
+41V/V to +230V/V. The bridge current source is pro-
grammable from 0.1mA to 2mA.
The MAX1478 uses four 12-bit DACs and one 3-bit
DAC, with calibration coefficients stored by the user in
an internal 128-bit EEPROM. This memory contains the
following information as 12-bit-wide words:
Configuration register
Offset calibration coefficient
Offset temperature error-compensation coefficient
FSO (full-span output) calibration coefficient
FSO temperature error-compensation coefficient
24 user-defined bits for customer programming of
manufacturing data (e.g., serial number and date)
Figure 1 shows a typical pressure-sensor output and
defines the offset, full-scale, and FSO values as a func-
tion of voltage.
M
1% Accurate, Digitally Trimmed,
Rail-to-Rail Sensor Signal Conditioner
4
_______________________________________________________________________________________
Pin Description
Positive Power-Supply Input. Connect a 0.1μF capacitor from V
DD
to V
SS.
V
DD
15
Current-Source Reference. An internal 75k
resistor (R
ISRC
) connects ISRC to V
SS
(see
Functional
Diagram
). Optionally, external resistors can be used in place of or in parallel with R
FTC
and R
ISRC
.
ISRC
9
PGA Output Voltage
OUT
10
Positive Sensor Input. Input impedance >1M
. Rail-to-rail input range.
INP
12
Sensor Excitation Current Output. This current source drives the bridge.
BDRIVE
13
Negative Sensor Input. Input impedance >1M
. Rail-to-rail input range.
INM
14
Buffered FSOTC DAC Output. An internal 75k
resistor (R
FTC
) connects FSOTC to ISRC (see
Functional
Diagram
). Optionally, external resistors can be used in place of or in parallel with R
FTC
and R
ISRC
.
FSOTC
5
Data Input/Output. Used only during programming/testing. Internally pulled to V
SS
with a 1M
(typical)
resistor. High impedance when CS is low.
DIO
6
Dual-Function Input Pin. Used to enable EEPROM erase/write operations. Also used to set the DAC refresh-
rate mode. Internally pulled to V
DD
with a 1M
(typical) resistor. See the
Chip-Select (CS) and Write-Enable
(WE)
section.
WE
7
Negative Power-Supply Input
V
SS
8
Temperature Sensor Output. An internal temperature sensor (a 100k
, 4600ppm/°C TC resistor) that can
provide a temperature-dependent voltage.
TEMP
4
Internally Connected. Leave unconnected.
I.C.
3, 11,
16
PIN
Chip-Select Input. The MAX1478 is selected when this pin is high. When low, OUT and DIO become high
impedance. Internally pulled to V
DD
with a 1M
(typical) resistor. Leave unconnected for normal operation.
CS
2
Data Clock Input. Used only during programming/testing. Internally pulled to V
SS
with a 1M
(typical) resis-
tor. Data is clocked in on the rising edge of the clock. The maximum SCLK frequency is 10kHz.
SCLK
1
FUNCTION
NAME
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