MAX188BEWP+T Maxim Integrated Products, MAX188BEWP+T Datasheet - Page 9

• Manufacturer Part Number: MAX188BEWP+T
• Description: IC ADC 12BIT SERIAL 20-SOIC
• Manufacturer: Maxim Integrated Products
• Type: Data Acquisition System (DAS)r

Specifications of MAX188BEWP+T

• Resolution (bits): 12 b
• Sampling Rate (per Second): 133k
• Data Interface: Serial
• Voltage Supply Source: Dual ±
• Voltage - Supply: ±5V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 20-SOIC (7.5mm Width)
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Internal protection diodes, which clamp the analog
input to V
swing from V
However, for accurate conversions near full scale, the
inputs must not exceed V
lower than V
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.
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
Figure 5. Quick-Look Circuit
* 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.
Analog Input Range and Input Protection
0.01µF
ANALOG
C2
4.096V
INPUT
0V TO
DD
1N4148
SS
0.01µF
SS
and V
by 50mV.
D1
- 0.3V to V
C1
4.7µF
+5V
_______________________________________________________________________________________
SS
, allow the channel input pins to
REFADJ
VREF
CH7
+2.5V
DD
DD
by more than 50mV, or be
MAX186
MAX188
REFERENCE
+ 0.3V without damage.
+2.5V
**
SSTRB
DGND
AGND
SHDN
DOUT
SCLK
Quick Look
V
V
DIN
CS
DD
SS
N.C.
+5V
Table 1a. Unipolar Full Scale and Zero Scale
* A = 1.678 for the MAX186, 1.638 for the MAX188
Table 1b. Bipolar Full Scale, Zero Scale, and
Negative Full Scale
* A = 1.678 for the MAX186, 1.638 for the MAX188
Low-Power, 8-Channel,
Internal Reference
(MAX186 only)
External Reference
Internal Reference
(MAX186 only)
External Reference
0.1µF
at REFADJ
at VREF
at REFADJ
at VREF
OSCILLATOR
Reference
+5V
2MHz
Reference
Serial 12-Bit ADCs
CH1
-1/2V
Full Scale
-1/2 VREF
-4.096V/2
Negative
x A*
OSCILLOSCOPE
REFADJ
CH2
CH3
Scale
Scale
Zero
Zero
0V
0V
0V
0V
0V
0V
CH4
V
+1/2V
+1/2 VREF
Full Scale
Full Scale
+4.096V/2
REFADJ
+4.096V
VREF
x A*
SSTRB
SCLK
DOUT*
REFADJ
x A*
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