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參數資料
| 型號： | XRD6406AID |
| 廠商： | EXAR CORP |
| 元件分類： | ADC |
| 英文描述： | CMOS 6 MSPS, 10-Bit, High Speed Analog-to-Digital Converter |
| 中文描述： | 1-CH 10-BIT RESISTANCE LADDER ADC, PARALLEL ACCESS, PDSO24 |
| 封裝： | 0.300 INCH, SOIC-24 |
| 文件頁數： | 7/12頁 |
| 文件大小： | 238K |
| 代理商： | XRD6406AID |
XRD6406
7
Rev. 1.00
1023
768
512
256
0
1V
2V
3V
4V
V
1
V
2
V
3
V
4
V
IN
Figure 7. A Piece Wise Linear, Logarithmic
Transfer Function
D
APPLICATION NOTES
Signals should not exceed AV
DD
or DV
DD
+0.5V or go below
DGND orAGND --0.5V. Allpins have internalprotectiondiodes
thatwillprotectthemfromshorttransients (<100
μ
s) outside the
supply range.
AGND and DGND pins are connectedinternally throughthe P--
substrate.
DC voltage differences between these pins will
cause undesirable internal substrate currents.
The power supply (AV
DD
) and reference voltage (V
RT
& V
RB
)
pins should be decoupled with 0.1
μ
F and 10
μ
F capacitors to
AGND, placed as close to the chip as possible.
The digital outputs should not drive long wires or buses. The
capacitive coupling and reflections will contribute noise to the
conversion.
V
IN
Analog Input
This parthas aswitchedcapacitortypeinputcircuit. This means
that the input impedance changes with the phase of the input
clock.
V
IN
is sampled at the high to low clock transition.
Figure 8.
shows an equivalent input circuit.
Figure 8. Equivalent Input Circuit
160
+
V
RT
+ V
RB
2
V
IN
AGND
100
18pF
1.5pF
AV
DD
CLK
CLK
CLK
5pF
RTS & RBS Internal Bias Resistors
Twomatchedresistors areprovidedonthechip.Theseresistors
can be used to generate on chip reference voltages. Each
resistorhas a value equalto1/3 ofthe reference ladderresistor.
By connecting RTS to V
RT
, and connecting RBS to V
RB
, the
reference ladder will be biased to 1V at V
RB
and 4V at V
RT
.
Iftheinternalreferencepins V
RTS
and/orV
RBS
arenotusedthey
should be left unconnected.
R1 thru R3 Reference Ladder Taps
These taps connect to every quarter point along the reference
ladder; R1 is 1/4th up from V
RB
, R3 is 3/4ths up from V
RB
(or
1/4th down from V
RT
). Normally these pins should have 0.1
microfaradcapacitors toAGND;this helps reducetheINL errors
by stabilizing the reference ladder voltages. These taps can
also be used to alter the transfer curve of the ADC. A four
segment, piecewise linear, custom transfer curve can be
designed by connecting voltage sources to these pins.
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相關代理商/技術參數 |
參數描述 |
|---|---|
| XRD6406AIP | 制造商:EXAR 制造商全稱:EXAR 功能描述:CMOS 6 MSPS, 10-Bit, High Speed Analog-to-Digital Converter |
| XRD6414 | 制造商:EXAR 制造商全稱:EXAR 功能描述:CMOS 10-Bit, 20 MSPS, High Speed Analog-to-Digital Converter with 4:1 Input Analog Multiplexer |
| XRD6414AIQ | 制造商:EXAR 制造商全稱:EXAR 功能描述:CMOS 10-Bit, 20 MSPS, High Speed Analog-to-Digital Converter with 4:1 Input Analog Multiplexer |
| XRD6440 | 制造商:EXAR 制造商全稱:EXAR 功能描述:10-BIT 40MSPS CMOS ADC |
| XRD6440AIQ | 制造商:EXAR 制造商全稱:EXAR 功能描述:10-BIT 40MSPS CMOS ADC |
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