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參數(shù)資料
| 型號： | TMC1273 |
| 廠商： | Fairchild Semiconductor Corporation |
| 英文描述： | 8 bit, 20 Msps, 3V Power Supply Video A/D Converter(8位,20Msps, 3V 電源視頻A/D轉換器) |
| 中文描述： | 8位，20 MSPS的3V的電源供應器視頻A / D轉換器（8位，20Msps，3V的電源視頻的A / D轉換器） |
| 文件頁數(shù)： | 2/20頁 |
| 文件大?。?/td> | 98K |
| 代理商： | TMC1273 |
PRODUCT SPECIFICATION
TMC1173A/TMC1273
2
P
Functional Description
The TMC1173A/1273 8-bit A/D converter uses a two-step
architecture to perform analog-to-digital conversion at rates
up to 20 Msps. The input signal is held in an integral track/
hold stage during the conversion process. Operation is pipe-
lined, with one input sample taken and one output word pro-
vided for each CONVert cycle.
The first step in the conversion process is a coarse 4-bit
quantization. This determines the range of the subsequent
fine 4-bit quantization step. To eliminate spurious codes, the
fine 4-bit A/D quantizer output is gray-coded and converted
to binary before it is combined with the coarse result to form
a complete 8-bit result.
The TMC1173A/1273 is characterized and specified for use
in “3 Volt” applications where the power supply voltage can
be as low as 2.7V.
Analog Input and Voltage References
The TMC1173A/1273 converts analog signals in the range
R
B
to R
T
into digital data. Input signals outside that range
produce “saturated” 00h or FFh output codes. The device
will not be damaged by signals within the range A
GND
to
V
DDA
.
The A/D converter input range is very flexible and extends
from the +3.3 Volt power supply to ground. The nominal
input range is 1.56 Volts, from 0.36V to 1.92V. The circuit is
characterized and performance is specified over that range.
However, the part will work well with a full-scale range from
1.0V to 3.0V. A reduced input range may simplify analog
signal conditioning circuitry, at the expense of additional
noise sensitivity and some reduced differential linearity per-
formance. Similarly, increasing the range can improve differ-
ential linearity, but puts a greater burden on the input signal
conditioning circuitry.
In many applications, external voltage reference sources are
connected to the R
T
and R
B
pins. R
B
can be grounded. Gain
and offset errors are directly related to the accuracy and
stability of the applied reference voltages.
Two reference pull-up and pull-down resistors connected to
VR+ and VR-, are provided internally for operation without
external voltage reference circuitry (Figure 1). The reference
voltages applied to R
T
and R
B
may be generated by connect-
ing VR+ to R
T
and VR- to R
B
. The power supply voltage is
divided by the on-chip resistors to bias the R
T
and R
B
points.
This sets-up the converter for operation in its nominal range
from 0.4V to 1.6V.
Figure 1. Reference Resistors
With V
DDA
at 3.0V, connecting VR+ to R
T
and grounding
R
B
will provide an input range from 0.0V to 1.36V, while
connecting R
T
to V
DDA
and R
B
to VR- produces a full scale
range of 2.31V referenced to V
DDA
. External resistors may
also be employed to provide arbitrary reference voltages, but
they will not match the temperature coefficient of the on-
chip resistors as well as R+ and R-, and will cause the con-
verter transfer function to vary with temperature.
With this implementation, errors in the power supply voltage
end up on the conversion data output.
Because a two-step conversion process is employed, it is
important that the references remain stable during the
ENTIRE conversion process (two clock cycles). The refer-
ence voltage can then be changed, but any conversion in
progress during a reference change is invalid.
VDDA
VR+
+3.0V
R
T
R+
324
RREF
270
R–
81
R
B
VR–
+1.56V
+0.36V
65-1173A-02
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| TMC1275M7C20 | 制造商:FAIRCHILD 制造商全稱:Fairchild Semiconductor 功能描述:Video A/D Conveter |
| TMC1275M7C30 | 制造商:FAIRCHILD 制造商全稱:Fairchild Semiconductor 功能描述:Video A/D Conveter |
| TMC1275M7C40 | 制造商:FAIRCHILD 制造商全稱:Fairchild Semiconductor 功能描述:Video A/D Conveter |
| TMC1275N2C20 | 制造商:FAIRCHILD 制造商全稱:Fairchild Semiconductor 功能描述:Video A/D Conveter |
| TMC1275N2C30 | 制造商:FAIRCHILD 制造商全稱:Fairchild Semiconductor 功能描述:Video A/D Conveter |
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