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MAX186DC/D Datasheet

  • MAX186DC/D

  • 低功耗、8通道、串行12位ADC

  • 0頁(yè)

  • MAXIM   MAXIM

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Low-Power, 8-Channel,
Serial 12-Bit ADCs
MAX186/MAX188
V
DD
0.1碌F
DGND
AGND
V
SS
SSTRB
CS
SCLK
DIN
+5V
D1
1N4148
REFADJ
VREF
C1
4.7碌F
+2.5V
+2.5V
REFERENCE
DOUT
SSTRB
+5V
2MHz
OSCILLATOR
CH1
CH2
CH3
CH4
DOUT*
+5V
OSCILLOSCOPE
SCLK
0V TO
4.096V
ANALOG 0.01碌F
INPUT
CH7
MAX186
MAX188
C2
0.01碌F
SHDN
N.C.
**
* FULL-SCALE ANALOG INPUT, CONVERSION RESULT = $FFF (HEX)
**REQUIRED FOR MAX188 ONLY. A POTENTIOMETER MAY BE USED IN PLACE OF THE REFERENCE FOR TEST PURPOSES.
Figure 5. Quick-Look Circuit
Analog Input Range and Input Protection
Internal protection diodes, which clamp the analog
input to V
DD
and V
SS
, allow the channel input pins to
swing from V
SS
- 0.3V to V
DD
+ 0.3V without damage.
However, for accurate conversions near full scale, the
inputs must not exceed V
DD
by more than 50mV, or be
lower than V
SS
by 50mV.
If the analog input exceeds 50mV beyond the sup-
plies, do not forward bias the protection diodes of
off-channels over two milliamperes, as excessive
current will degrade the conversion accuracy of the
on-channel.
The full-scale input voltage depends on the voltage at
VREF. See Tables 1a and 1b.
Table 1a. Unipolar Full Scale and Zero Scale
Reference
Internal Reference
(MAX186 only)
External Reference
at REFADJ
at VREF
Zero
Scale
0V
0V
0V
Full Scale
+4.096V
V
REFADJ
x A*
VREF
* A = 1.678 for the MAX186, 1.638 for the MAX188
Table 1b. Bipolar Full Scale, Zero Scale, and
Negative Full Scale
Reference
Internal Reference
(MAX186 only)
External Reference
at REFADJ
at VREF
Negative
Full Scale
-4.096V/2
-1/2V
REFADJ
x A*
-1/2 VREF
Zero
Scale
0V
0V
0V
Full Scale
+4.096V/2
+1/2V
REFADJ
x A*
+1/2 VREF
Quick Look
To evaluate the analog performance of the
MAX186/MAX188 quickly, use the circuit of Figure 5.
The MAX186/MAX188 require a control byte to be writ-
ten to DIN before each conversion. Tying DIN to +5V
feeds in control bytes of $FF (HEX), which trigger
* A = 1.678 for the MAX186, 1.638 for the MAX188
9
_______________________________________________________________________________________

MAX186DC/D PDF文件相關(guān)型號(hào)

MAX186EVKIT,MAX187BC/D

MAX186DC/D 產(chǎn)品屬性

  • Maxim Integrated Products

  • 1

  • 8

  • SAR

  • 133 KSPs

  • 12 bit

  • Single Ended, Differential

  • 4-Wire (SPI, Microwire, QSPI, TMS320)

  • 4.096 V

  • 6 V

  • - 0.3 V

  • 640 mW

MAX186DC/D相關(guān)型號(hào)PDF文件下載

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