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参数资料
| 型号： | MAX116CAX |
| 厂商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分类： | ADC |
| 英文描述： | 2x4-Channel, Simultaneous-Sampling 12-Bit ADCs |
| 中文描述： | 4-CH 12-BIT SUCCESSIVE APPROXIMATION ADC, PARALLEL ACCESS, PDSO36 |
| 封装： | 0.300 INCH, 0.80 MM PITCH, SSOP-36 |
| 文件页数： | 11/14页 |
| 文件大小： | 215K |
| 代理商： | MAX116CAX |
Internal and External Reference
The MAX115/MAX116 can be used with an internal or
external reference voltage. An external +2.5 reference
can be connected directly at REFIN. An internal buffer
with a gain of +1 provides +2.5V at REFOUT.
Internal Reference
The full-scale range with the internal reference is ±5V
for the MAX115 and ±2.5V for the MAX116. Bypass
REFIN with a 0.1μF capacitor to AGND, and bypass the
REFOUT pin with a 4.7μF (min) capacitor to AGND
(Figure 6). The maximum value to compensate the ref-
erence buffer is 22μF. Larger values are acceptable if
low-ESR capacitors are used.
External Reference
For operation over a wide temperature range, an exter-
nal +2.5V reference with tighter specifications improves
accuracy. The MAX6325 is an excellent choice
to match the MAX115/MAX116 accuracy over the
commercial and extended temperature ranges with a
1ppm/°C (max) temperature drift. Connect an external
reference at REFIN as shown in Figure 7. The minimum
impedance is 7k
for DC currents in both normal oper-
ation and shutdown. Bypass REFOUT with a 4.7μF low-
ESR capacitor.
Power-On Reset
When power is first applied, the internal power-on reset
(POR) circuitry activates the MAX115/MAX116 with
INT
= high, ready to convert. The default conversion mode
is Input Mux A/Single Channel Conversion. See the
Programming Modes
section if other configurations are
desired.
After the power supplies have been stabilized, the reset
time is 5μs. No conversions should be performed
during this phase. At power-up, data-in memory is
undefined.
Software Power-Down
Software power-down is activated by setting bit A3 of
the control word high (Table 1). It is asserted after the
WR
or
CS
rising edge, at which point the ADC immedi-
ately powers down to a low quiescent-current state.
I
AVDD
and I
AVSS
drop to less than 1μA (typ), and I
DVDD
drops to 13μA (typ). The ADC circuitry and reference
buffer are turned off, but the digital interface and the
reference remain active for fast power-up recovery.
Wake up the MAX115/MAX116 by writing a control
word (A0–A3, Table 1). The bidirectional interface inter-
prets a logic zero at A3 as the start signal, and powers
up in the mode selected by A0, A1, and A2. The refer-
ence buffer’s settling time and the bypass capacitor’s
value dominate the power-up delay. With the recom-
mended 4.7μF at REFOUT, the power-up delay is typi-
cally 20ms.
Transfer Function
The MAX115/MAX116 have bipolar input ranges. Figure
8 shows the bipolar/output transfer function. Code tran-
sitions occur at successive-integer least significant bit
M
2x4-Channel, Simultaneous-Sampling
12-Bit ADCs
______________________________________________________________________________________
11
TO DAC
REFIN
10k
4.7
μ
F
A
V
= 1
2.5V
REFOUT
7
6
(2.5V)
(2.5V)
OUT
MAX6325
MAX115
MAX116
Figure 7. External Reference
011
. . .
111
011
. . .
110
000
. . .
010
000
. . .
001
000
. . .
000
111
. . .
111
111
. . .
110
111
. . .
101
100
. . .
001
100
. . .
000
- FS
ZERO
INPUT VOLTAGE (LSB)
OUTPUT CODE
+FS - 1LSB
4096
MAX115:
FS = 2 x V
REFOUT
, 1LSB = 4V
REFOUT
MAX116:
FS = V
REFOUT
, 1LSB = 2V
REFOUT
4096
Figure 8. Bipolar Transfer Function
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX116CAX+T | 功能描述:数据转换系统 RoHS:否 制造商:Texas Instruments 转换速率:0.001 MSPs 分辨率:24 bit 最大工作温度:+ 125 C 最小工作温度:- 40 C 安装风格:SMD/SMT 封装 / 箱体:TQFP-64 封装:Reel |
| MAX116CAX-T | 功能描述:数据转换系统 RoHS:否 制造商:Texas Instruments 转换速率:0.001 MSPs 分辨率:24 bit 最大工作温度:+ 125 C 最小工作温度:- 40 C 安装风格:SMD/SMT 封装 / 箱体:TQFP-64 封装:Reel |
| MAX116EAX | 功能描述:数据转换系统 Integrated Circuits (ICs) RoHS:否 制造商:Texas Instruments 转换速率:0.001 MSPs 分辨率:24 bit 最大工作温度:+ 125 C 最小工作温度:- 40 C 安装风格:SMD/SMT 封装 / 箱体:TQFP-64 封装:Reel |
| MAX116EAX+T | 功能描述:数据转换系统 RoHS:否 制造商:Texas Instruments 转换速率:0.001 MSPs 分辨率:24 bit 最大工作温度:+ 125 C 最小工作温度:- 40 C 安装风格:SMD/SMT 封装 / 箱体:TQFP-64 封装:Reel |
| MAX116EAX-T | 功能描述:数据转换系统 RoHS:否 制造商:Texas Instruments 转换速率:0.001 MSPs 分辨率:24 bit 最大工作温度:+ 125 C 最小工作温度:- 40 C 安装风格:SMD/SMT 封装 / 箱体:TQFP-64 封装:Reel |
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