參數(shù)資料
型號(hào)： MAX199BMYI
廠商： MAXIM INTEGRATED PRODUCTS INC
元件分類： 模擬信號(hào)調(diào)理
英文描述： Multi-Range (【4V, 【2V, +4V, +2V), +5V Supply, 12-Bit DAS with 8+4 Bus Interface
中文描述： SPECIALTY ANALOG CIRCUIT, CDIP28
封裝： 0.600 INCH, SIDE BRAZED, CERAMIC, DIP-28
文件頁(yè)數(shù)： 13/16頁(yè)
文件大?。?/td> 165K
代理商： MAX199BMYI
__________Applic ations Information
Power-On Reset
At power-up, the internal power-supply circuitry sets INT
high and puts the device in normal operation / external
clock mode. This state is selected to keep the internal
clock from loading the external clock driver when the
part is used in external clock mode.
Internal or External Referenc e
The MAX199 can operate with either an internal or external
reference. An external reference can be connected to
either the REF pin or to the REFADJ pin (Figure 9).
To use the REF input directly, disable the internal buffer
by tying REFADJ to V
DD
. Using the REFADJ input elimi-
nates the need to buffer the reference externally.
When the reference is applied at REFADJ , bypass
REFADJ with a 0.01μF capacitor to AGND.
The REFADJ internal buffer gain is trimmed to 1.6384 to
provide 4.096V at the REF pin from a 2.5V reference.
Internal Reference
The internally trimmed 2.50V reference is gained
through the REFADJ buffer to provide 4.096V at REF.
Bypass the REF pin with a 4.7μF capacitor to AGND
and the REFADJ pin with a 0.01μF capacitor to AGND.
The internal reference voltage is adjustable to ±1.5%
(±65 LSBs) with the reference-adjust circuit of Figure 1.
External Reference
At REF and REFADJ , the input impedance is a mini-
mum of 10k
for DC currents. During conversions, an
external reference at REF must be able to deliver
400μA DC load currents, and must have an output
impedance of 10
or less. If the reference has higher
input impedance or is noisy, bypass it close to the REF
pin with a 4.7μF capacitor to AGND.
With an external reference voltage of less than 4.096V
at the REF pin or less than 2.5V at the REFADJ pin, the
increase in the ratio of the RMS noise to the LSB value
(FS / 4096) results in performance degradation (loss of
effective bits).
M
Multi-Range (±4V, ±2V, +4V, +2V ),
+5V S upply, 12-Bit DAS with 8+4 Bus Interfac e
______________________________________________________________________________________
13
REF
10k
2.5V
26 4.096V
4.7
μ
F
C
REF
0.01
μ
F
25
REFADJ
A
V
= 1.638
MAX199
Figure 9a. Internal Reference
REF
10k
2.5V
26 4.096V
4.7
μ
F
C
REF
2.5V
25
REFADJ
A
V
= 1.638
0.01
μ
F
MAX199
Figure 9c. The external reference at REFADJ overdrives the
internal reference.
REF
V
DD
10k
2.5V
26
4.096V
4.7
μ
F
C
REF
25
REFADJ
A
V
= 1.638
MAX199
Figure 9b. External Reference at REF
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