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参数资料
| 型号： | MAX198BMYI |
| 厂商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分类： | 模拟信号调理 |
| 英文描述： | Multirange, Single %V, 12-Bit DAS with 12-Bit Bus Interface |
| 中文描述： | SPECIALTY ANALOG CIRCUIT, CDIP28 |
| 封装： | 0.600 INCH, SIDE BRAZED, CERAMIC, DIP-28 |
| 文件页数： | 14/16页 |
| 文件大小： | 165K |
| 代理商： | MAX198BMYI |
M
results may be read. Input overvoltage protection is
active in all power-down modes. The device returns to
normal operation on the first WR falling edge during
write operation.
Choosing Power-Down Modes
The bandgap reference and reference buffer remain
active in STBYPD mode, maintaining the voltage on the
4.7μF capacitor at the REF pin. This is a “DC” state that
does not degrade after power-down of any duration.
Therefore, you can use any sampling rate with this
mode, without regard to start-up delays.
However, in FULLPD mode, only the bandgap refer-
ence is active. Connect a 33μF capacitor between REF
and AGND to maintain the reference voltage between
conversions and to reduce transients when the buffer is
enabled and disabled. Throughput rates down to 1ksps
can be achieved without allotting extra acquisition time
for reference recovery prior to conversion. This allows
conversion to begin immediately after power-down
ends. If the discharge of the REF capacitor during
FULLPD exceeds the desired limits for accuracy (less
than a fraction of an LSB), run a STBYPD power-down
cycle prior to starting conversions. Take into account
that the reference buffer recharges the bypass capaci-
tor at an 80mV/ms slew rate, and add 50μs for settling
time. Throughput rates of 10ksps offer typical supply
currents of 470μA, using the recommended 33μF
capacitor value.
Auto-Shutdown
Selecting STBYPD on every conversion automatically
shuts the MAX196/MAX198 down after each conversion
without requiring any start-up time on the next conversion.
T ransfer Func tion
Output data coding for the MAX196/MAX198 is binary
in unipolar mode with 1LSB = (FS / 4096) and twos-
complement binary in bipolar mode with 1LSB = [(2 x
|
FS
|
) / 4096]. Code transitions occur halfway between
successive-integer LSB values. Figures 10 and 11
show the input/output (I/O) transfer functions for unipo-
lar and bipolar operations, respectively. For full-scale
(FS) values, refer to Table 1.
Multirange, S ingle +5V, 12-Bit DAS
with 12-Bit Bus Interfac e
14
______________________________________________________________________________________
OUTPUT CODE
INPUT VOLTAGE (LSB)
0
FS
FS -
3
/
2
LSB
1 LSB =
FULL-SCALE
TRANSITION
1
2
3
11... 111
11... 110
11... 101
00... 011
00... 010
00... 001
00... 000
FS
4096
Figure 10. Unipolar Transfer Function
OUTPUT CODE
INPUT VOLTAGE (LSB)
0V
+FS - 1 LSB
1 LSB =
-FS
011... 111
011... 110
000... 001
000... 000
111... 111
100... 010
100... 001
100... 000
2
FS
4096
Figure 11. Bipolar Transfer Function
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