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參數(shù)資料
| 型號(hào)： | LTC2451ITSB#TRMPBF |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | ADC |
| 英文描述： | 1-CH 16-BIT DELTA-SIGMA ADC, SERIAL ACCESS, PDSO8 |
| 封裝： | LEAD FREE, PLASTIC, MO-193, TSOT-23, 8 PIN |
| 文件頁數(shù)： | 4/18頁 |
| 文件大?。?/td> | 245K |
| 代理商： | LTC2451ITSB#TRMPBF |
LTC2451
12
2451ff
range of 0.5V to VCC – 0.5V may result in additional cur-
rent leakage from the part.
Driving VCC and GND
In relation to the VCC and GND pins, the LTC2451 combines
internal high frequency decoupling with damping elements,
which reduce the ADC performance sensitivity to PCB
layout and external components. Nevertheless, the very
high accuracy of this converter is best preserved by careful
low and high frequency power supply decoupling.
A 0.1μF, high quality, ceramic capacitor in parallel with a
10μF ceramic capacitor should be connected between the
VCC and GND pins, as close as possible to the package.
The 0.1μF capacitor should be placed closest to the ADC.
It is also desirable to avoid any via in the circuit path,
starting from the converter VCC pin, passing through these
two decoupling capacitors, and returning to the converter
GND pin. The area encompassed by this circuit path, as
well as the path length, should be minimized.
Very low impedance ground and power planes, and star
connections at both VCC and GND pins, are preferable.
The VCC pin should have three distinct connections: the
rst to the decoupling capacitors described above, the
second to the ground return for the input signal source,
and the third to the ground return for the power supply
voltage source.
Driving REF+ and REF–
A simplied equivalent circuit for REF+ and REF– is shown
in Figure 10. Like all other A/D converters, the LTC2451
is only as accurate as the reference it is using. Therefore,
it is important to keep the reference line quiet by careful
low and high frequency power supply decoupling.
The LT6660 reference is an ideal match for driving the
LTC2451’s REF+ pin. The LTC6660 is available in a 2mm ×
2mm DFN package with 2.5V, 3V, 3.3V and 5V options.
A 0.1μF, high quality, ceramic capacitor in parallel with a
10μF ceramic capacitor should be connected between the
REF+/REF–andGNDpins,ascloseaspossibletothepackage.
The 0.1μF capacitor should be placed closest to the ADC.
Figure 10. LTC2451 Analog Input and
Reference Pins Equivalent Circuit
Driving IN
The input drive requirements can best be analyzed using
the equivalent circuit of Figure 11. The input signal, VSIG, is
connected to the ADC input pin (IN) through an equivalent
source resistance RS. This resistor includes both the actual
generator source resistance and any additional optional
resistors connected to the input pin. An optional input
capacitor, CIN, is also connected between the ADC input
pin and GND. This capacitor is placed in parallel with the
ADC input parasitic capacitance, CPAR. Depending on the
PCB layout, CPAR has typical values between 2pF and 15pF.
In addition, the equivalent circuit of Figure 11 includes the
converter equivalent internal resistor, RSW, and sampling
capacitor, CEQ.
There are some immediate trade-offs in RS and CIN without
needing a full circuit analysis. Increasing RS and CIN can
provide the following benets:
1. Due to the LTC2451’s input sampling algorithm, the
input current drawn by the input pin (IN) over a con-
version cycle is 50nA. A high RS CIN attenuates the
high frequency components of the input current, and
RS values up to 1k result in <1LSB additional INL.
APPLICATIONS INFORMATION
VCC
CEQ
0.35pF
(TYP)
REF+
IN
REF–
2451 F10
RSW
15k
(TYP)
ILEAK
RSW
15k
(TYP)
ILEAK
RSW
15k
(TYP)
ILEAK
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