MAX192BCAP+T | |
|---|---|
| Manufacturer Part Number | MAX192BCAP+T |
| Description | IC ADC 10BIT SERIAL 20-SSOP |
| Manufacturer | Maxim Integrated Products |
| Type | Data Acquisition System (DAS), ADC |
| MAX192BCAP+T datasheets |
|
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Specifications of MAX192BCAP+T | |||
|---|---|---|---|
| Resolution (bits) | 10 b | Sampling Rate (per Second) | 133k |
| Data Interface | Serial | Voltage Supply Source | Single Supply |
| Voltage - Supply | ±5V | Operating Temperature | 0°C ~ 70°C |
| Mounting Type | Surface Mount | Package / Case | 20-SSOP |
| Lead Free Status / RoHS Status | Lead free / RoHS Compliant | ||
PrevNext
Low-Power, 8-Channel,
Serial 10-Bit ADC
OUTPUT CODE
FULL-SCALE
TRANSITION
11 . . . 111
11 . . . 110
11 . . . 101
00 . . . 011
00 . . . 010
00 . . . 001
00 . . . 000
0
1
2
3
INPUT VOLTAGE (LSBs)
Figure 15. Unipolar Transfer Function, 4.096V = Full Scale
MAX192 is inactive for long periods of time, but where
intermittent bursts of high-speed conversions are
required.
External and Internal References
The MAX192 can be used with an internal or external
reference. Diode D1 shown in the Typical Operating
Circuit ensures correct start-up. Any standard signal
diode can be used. An external reference can either be
connected directly at the VREF terminal or at the
REFADJ pin.
The MAX192’s internally trimmed 2.46V reference is
buffered with a gain of 1.678 to scale an external 2.5V
reference at REFADJ to 4.096V at VREF.
The full-scale range of the MAX192 with internal reference
is 4.096V with unipolar inputs, and ±2.048V with differen-
tial bipolar inputs. The internal reference voltage is
adjustable to ±1.5% with the Reference-Adjust Circuit of
Figure 17.
External Reference
An external reference can be placed at either the
input (REFADJ) or the output (VREF) of the internal
buffer amplifier. The REFADJ input impedance is
18
______________________________________________________________________________________
OUTPUT CODE
011 . . . 111
011 . . . 110
000 . . . 010
000 . . . 001
000 . . . 000
FS = +4.096V
1LSB = FS
111 . . . 111
1024
111 . . . 110
111 . . . 101
100 . . . 001
100 . . . 000
FS
FS - 3/2LSB
Figure 16. Differential Bipolar Transfer Function,
±4.096V / 2 = Full Scale
typically 20kΩ. At VREF, the input impedance is a
minimum of 12kΩ for DC currents. During conversion,
an external reference at VREF must be able to deliver
up to 350µA DC load current and have an output
impedance of 10Ω or less. If the reference has higher
output impedance or is noisy, bypass it close to the
VREF pin with a 4.7µF capacitor.
Using the buffered REFADJ input avoids external
buffering of the reference. To use the direct VREF input,
disable the internal buffer by tying REFADJ to V
Figure 15 depicts the nominal, unipolar input/output
(I/O) transfer function, and Figure 16 shows the differ-
ential bipolar input/output transfer function. Code
Internal Reference
transitions occur halfway between successive integer
LS B v al ue s. O ut p ut codi ng i s bi nary wi t h
1LSB = 4.00mV (4.096V / 1024) for unipolar operation
and 1LSB = 4.00mV [(4.096V / 2 - -4.096V / 2)/1024]
for bipolar operation.
Figure 17, the Reference-Adjust Circuit, shows how to
adjust the ADC gain in applications that use the internal
reference. The circuit provides ±1.5% (±15LSBs) of
gain adjustment range.
FS = +4.096
2
1LSB = +4.096
1024
0V
-FS
+FS - 1LSB
DIFFERENTIAL INPUT VOLTAGE (LSBs)
Transfer Function and Gain Adjust
.
DD
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