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參數(shù)資料
| 型號： | MAX192 |
| 廠商： | Maxim Integrated Products, Inc. |
| 英文描述： | Low-Power, 8-Channel,Serial 10-Bit ADC(8通道,133ksps串行10位A/D轉換器) |
| 中文描述： | 低功耗、8通道、串行10位ADC |
| 文件頁數(shù)： | 18/24頁 |
| 文件大?。?/td> | 211K |
| 代理商： | MAX192 |
M
dummy conversion. This circuit combines fast
multi-channel conversion with lowest power consump-
tion possible. Full power-down mode may provide
increased power savings in applications where the
MAX192 is inactive for long periods of time, but where
intermittent bursts of high-speed conversions are
required.
External and Internal Referenc es
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.
Internal Reference
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
typically 20k
. At VREF, the input impedance is a
minimum of 12k
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 10
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
DD
.
T ransfer Func tion and Gain Adjust
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
transitions occur halfway between successive integer
LSB values. Output coding is binary with
1LSB = 4.00mV (4.096V / 1024) for unipolar operation
and 1LSB = 4.00mV [(4.096V / 2 - -4.096V / 2)/1024]
for bipolar operation.
Low-Power, 8-Channel,
S erial 10-Bit ADC
18
______________________________________________________________________________________
OUTPUT CODE
FULL-SCALE
TRANSITION
11 . . . 111
11 . . . 110
11 . . . 101
00 . . . 011
00 . . . 010
00 . . . 001
00 . . . 000
1
2
3
0
FS
FS - 3/2LSB
FS = +4.096V
1LSB = FS
1024
INPUT VOLTAGE (LSBs)
011 . . . 111
011 . . . 110
000 . . . 010
000 . . . 001
000 . . . 000
111 . . . 111
111 . . . 110
111 . . . 101
100 . . . 001
100 . . . 000
-FS
0V
DIFFERENTIAL INPUT VOLTAGE (LSBs)
+FS - 1LSB
FS = +4.096
2
1LSB = +4.096
1024
Figure 15. Unipolar Transfer Function, 4.096V = Full Scale
Figure 16. Differential Bipolar Transfer Function,
±4.096V / 2 = Full Scale
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