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參數(shù)資料
| 型號： | MAX199BEWI+T |
| 廠商： | Maxim Integrated Products |
| 文件頁數(shù)： | 5/16頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC DAS 12BIT 8CH 28-SOIC |
| 產(chǎn)品培訓模塊： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 標準包裝： | 1,000 |
| 類型： | 數(shù)據(jù)采集系統(tǒng)（DAS） |
| 分辨率（位）： | 12 b |
| 采樣率（每秒）： | 100k |
| 數(shù)據(jù)接口： | 并聯(lián) |
| 電壓電源： | 單電源 |
| 電源電壓： | 4.75 V ~ 5.25 V |
| 工作溫度： | -40°C ~ 85°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 28-SOIC（0.295"，7.50mm 寬） |
| 供應商設備封裝： | 28-SOIC W |
| 包裝： | 帶卷 (TR) |
__________Applications 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 Reference
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 VDD. Using the REFADJ input elimi-
nates the need to buffer the reference externally.
When the reference is applied at REFADJ, bypass
REFADJ with a 0.01F 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 4.7F capacitor to AGND
and the REFADJ pin with a 0.01F 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
400A 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 4.7F 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).
MAX199
Multi-Range (±4V, ±2V, +4V, +2V),
+5V Supply, 12-Bit DAS with 8+4 Bus Interface
______________________________________________________________________________________
13
REF
10k
2.5V
26 4.096V
4.7
F
CREF
0.01
F
25
REFADJ
AV = 1.638
MAX199
Figure 9a. Internal Reference
REF
10k
2.5V
26 4.096V
4.7
F
CREF
2.5V
25
REFADJ
AV = 1.638
0.01
F
MAX199
Figure 9c. The external reference at REFADJ overdrives the
internal reference.
REF
VDD
10k
2.5V
26
4.096V
4.7
F
CREF
25
REFADJ
AV = 1.638
MAX199
Figure 9b. External Reference at REF
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