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| 型號： | MAX1359BCTL-T |
| 廠商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分類： | 模擬信號調(diào)理 |
| 英文描述： | SPECIALTY ANALOG CIRCUIT, QCC40 |
| 封裝： | 6 X 6 MM, 0.80 MM HEIGHT, MO220, TQFN-40 |
| 文件頁數(shù)： | 60/74頁 |
| 文件大?。?/td> | 1214K |
| 代理商： | MAX1359BCTL-T |
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MAX1358/MAX1359/MAX1360
16-Bit Data-Acquisition Systems with ADC, DACs,
UPIOs, RTC, Voltage Monitors, and Temp Sensor
______________________________________________________________________________________
63
nal is then switched in as the ADC reference voltage
and a conversion is performed. The AVDD value can
then be calculated directly as:
VAVDD = (VREF x Gain x 65536) / N
where VREF is the reference voltage for the ADC, Gain
is the PGA gain before the ADC, and N is the ADC
result. Note the AVDD voltage must be greater than the
gained-up REF voltage (AVDD > VREF x GAIN). This
measurement must be done in unipolar mode.
Power Supplies
AVDD and DVDD provide power to the MAX1358/
MAX1359/MAX1360. The AVDD powers up the analog
section, while the DVDD powers 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 parallel with a 0.1F
ceramic capacitor. For improved performance, place the
bypass capacitors as close to the device as possible.
ADC Transfer Functions
Figures 22 and 23 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 24 shows the
MAX1358/MAX1359’s unipolar output circuit, which is
also the typical operating circuit for the DACs. Table 23
lists some unipolar input codes and their correspond-
ing output voltages.
For larger output swing, see Figure 25. This circuit
shows the output amplifiers configured with a closed-
MAX1358
MAX1359
DAC A
OUTA
OUTB
THE MAX1359 HAS ONE DAC.
VREF = 1.25V
REF
DAC B
FBA
10k
10k
10k
10k
FBB
Figure 25. DAC Unipolar Rail-to-Rail Output Circuit
R2
R2 = R1
R1
MAX1358
MAX1359
DAC_
OUT_
VOUT
+3.3V
-3.3V
FB_
VREF = 1.25V
VREF
Figure 26. DAC Bipolar 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 23. Unipolar Code Table
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 24. Bipolar Code Table
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