參數(shù)資料
型號(hào)： MAX1358BETL+T
廠商： Maxim Integrated Products
文件頁數(shù)： 59/71頁
文件大小： 0K
描述： IC DAS 16BIT 40-TQFN
產(chǎn)品培訓(xùn)模塊： Lead (SnPb) Finish for COTS
Obsolescence Mitigation Program
標(biāo)準(zhǔn)包裝： 2,500
類型： 數(shù)據(jù)采集系統(tǒng)（DAS）
分辨率（位）： 16 b
采樣率（每秒）： 21.94k
數(shù)據(jù)接口： MICROWIRE?，QSPI?，串行，SPI?
電壓電源： 模擬和數(shù)字
電源電壓： 1.8 V ~ 3.6 V
工作溫度： -40°C ~ 85°C
安裝類型： 表面貼裝
封裝/外殼： 40-WFQFN 裸露焊盤
供應(yīng)商設(shè)備封裝： 40-TQFN-EP（6x6）
包裝： 帶卷 (TR)
MAX1358B
16-Bit, Data-Acquisition System with ADC, DACs,
UPIOs, RTC, Voltage Monitors, and Temp Sensor
62
______________________________________________________________________________________
Power Supplies
AVDD and DVDD provide power to the MAX1358B. The
AVDD powers up the analog section, while the DVDD pow-
ers up the digital section. The power supply for both AVDD
and DVDD ranges from +1.8V to +3.6V. Both AVDD and
DVDD must be greater than +1.8V for device operation.
AVDD and DVDD can connect to the same power supply.
Bypass AVDD to AGND with a 10F electrolytic capacitor
in parallel with a 0.1F ceramic capacitor, and bypass
DVDD to DGND with a 10F electrolytic capacitor in paral-
lel with a 0.1F ceramic capacitor. For improved perfor-
mance, place the bypass capacitors as close to the device
as possible.
ADC Transfer Functions
Figures 20 and 21 provide the ADC transfer functions
for unipolar and bipolar mode. The digital output code
format is binary for unipolar mode and two’s comple-
ment for bipolar mode. Calculate 1 LSB using the fol-
lowing equations:
1 LSB (Unipolar Mode) = VREF/(Gain x 65,536)
1 LSB (Bipolar Mode) = ±2VREF/(Gain x 65,536)
where VREF equals the reference voltage at REF and
Gain equals the PGA gain.
In unipolar mode, the output code ranges from 0 to
65,535 for inputs from zero to full-scale. In bipolar
mode, the output code ranges from -32,768 to +32,767
for inputs from negative full-scale to positive full-scale.
DAC Unipolar Output
For a unipolar output, the output voltages and the refer-
ence have the same polarity. Figure 22 shows the
unipolar output circuit of the MAX1358B, which is also
the typical operating circuit for the DAC. Table 22 lists
some unipolar input codes and their corresponding
output voltages.
For larger output swing, see Figure 23. This circuit
shows the output amplifiers configured with a closed-
loop gain of +2V/V to provide 0 to 2.5V full-scale range
with the 1.25V reference.
DAC Bipolar Output
The MAX1358B DAC output can be configured for
bipolar operation using the application circuit in
Figure 24:
where N is the decimal value of the DAC’s binary input code.
Table 23 shows digital codes (offset binary) and corre-
sponding output voltages for Figure 24 assuming
R1 = R2.
VV
N
OUT
REF
=
2
1024
1
MAX1358B
DAC A
OUTA
OUTB
VREF = 1.25V
REF
DAC B
FBA
10k
Ω
10k
Ω
10k
Ω
10k
Ω
FBB
R2
R2 = R1
R1
MAX1358B
DAC_
OUT_
VOUT
+3.3V
-3.3V
FB_
VREF = 1.25V
VREF
Figure 24. DAC Bipolar Output Circuit
Figure 23. DAC Unipolar Rail-to-Rail Output Circuit
DAC CONTENTS
MSB
LSB
ANALOG OUTPUT
1111 1111 11
+VREF (1023/1024)
1000 0000 01
+VREF (513/1024)
1000 0000 00
+VREF (512/1024) = +VREF/2
0111 1111 11
+VREF (511/1024)
0000 0000 01
+VREF (1/1024)
0000 0000 00
0
Table 22. Unipolar Code
DAC CONTENTS
MSB
LSB
ANALOG OUTPUT
1111 1111 11
+VREF (511/512)
1000 0000 01
+VREF (1/512)
1000 0000 00
0
0111 1111 11
-VREF (1/512)
0000 0000 01
-VREF (511/512)
0000 0000 00
-VREF (512/512) = -VREF
Table 23. Bipolar Code
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