參數(shù)資料
型號(hào)： MAX1302BEUG+T
廠商： Maxim Integrated Products
文件頁(yè)數(shù)： 18/31頁(yè)
文件大?。?/td> 0K
描述： IC ADC 16BIT SRL 115KSPS 24TSSOP
標(biāo)準(zhǔn)包裝： 2,500
位數(shù)： 16
采樣率（每秒）： 115k
數(shù)據(jù)接口： MICROWIRE?，QSPI?，串行，SPI?
轉(zhuǎn)換器數(shù)目： 1
功率耗散（最大）： 1.11W
電壓電源： 模擬和數(shù)字
工作溫度： -40°C ~ 85°C
安裝類型： 表面貼裝
封裝/外殼： 24-TSSOP（0.173"，4.40mm 寬）
供應(yīng)商設(shè)備封裝： 24-TSSOP
包裝： 帶卷 (TR)
輸入數(shù)目和類型： 8 個(gè)單端，單極；8 個(gè)單端，雙極；4 個(gè)差分，單極；4 個(gè)差分，雙極
External-acquisition-mode control byte
Internal-clock-mode control byte
Reset byte
Partial power-down-mode control byte
This prevents the MAX1302 from inadvertently exiting
full power-down mode because of a CS glitch in a noisy
digital environment.
Power-On Reset
The MAX1302 powers up in normal operation configured
for external clock mode with all circuitry active (Tables 7
and 8). Each analog input channel (CH0–CH7) is set for
single-ended conversions with a ±VREF bipolar input
range (Table 6).
Allow the power supplies to stabilize after power-up. Do
not initiate any conversions until the power supplies
have stabilized. Additionally, allow 10ms for the internal
reference to stabilize when CREF = 1.0F and CRECAP
= 0.1F. Larger reference capacitors require longer
stabilization times.
Internal or External Reference
The MAX1302 operates with either an internal or external
reference. The reference voltage impacts the ADC’s FSR
(Figures 12, 13, and 14). An external reference is recom-
mended if more accuracy is required than the internal ref-
erence provides, and/or multiple converters require the
same reference voltage.
Internal Reference
The MAX1302 contains an internal 4.096V bandgap refer-
ence. This bandgap reference is connected to REFCAP
through a nominal 5k
resistor (Figure 17). The voltage at
REFCAP is buffered creating 4.096V at REF. When using
the internal reference, bypass REFCAP with a 0.1F or
greater capacitor to AGND1 and bypass REF with a
1.0F or greater capacitor to AGND1.
External Reference
For external reference operation, disable the internal
reference and reference buffer by connecting REFCAP
to AVDD1. With AVDD1 connected to REFCAP, REF
becomes a high-impedance input and accepts an
external reference voltage. The MAX1302 external ref-
erence current varies depending on the applied refer-
ence voltage and the operating mode (see the External
Reference Input Current vs. External Reference Input
Voltage in the
Typical Operating Characteristics).
Applications Information
Noise Reduction
Additional samples can be taken and averaged (over-
sampling) to remove the effect of transition noise on
conversion results. The square root of the number of
samples determines the improvement in performance.
For example, with 2/3 LSBRMS (4 LSBP-P) transition
noise, 16 (42 = 16) samples must be taken to reduce
the noise to 1 LSBP-P.
Interface with 4–20mA Signals
Figure 19 illustrates a simple interface between the
MAX1302 and a 4–20mA signal. 4–20mA signaling can
be used as a binary switch (4mA represents a logic-low
signal, 20mA represents a logic-high signal), or for pre-
cision communication where currents between 4mA
and 20mA represent intermediate analog data. For
binary switch applications, connect the 4–20mA signal
to the MAX1302 with a resistor to ground. For example,
a 200
resistor converts the 4–20mA signal to a 0.8V to
4V signal. Adjust the resistor value so the parallel com-
bination of the resistor and the MAX1302 source
impedance is 200
. In this application, select the sin-
gle-ended 0V to VREF range (R[2:0] = 011, Table 6).
For applications that require precision measurements
of continuous analog currents between 4mA and 20mA,
use a buffer to prevent the MAX1302 input from divert-
ing current from the 4–20mA signal.
MAX1302
8-Channel, ±VREF Multirange Inputs,
Serial 16-Bit ADC
______________________________________________________________________________________
25
REF
REFCAP
AGND1
4.096V
BANDGAP
REFERENCE
5k
1x
SAR
ADC REF
4.096V
1.0
F
0.1
F
VRCTH
MAX1302
Figure 17. Internal Reference Operation
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