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參數(shù)資料
| 型號(hào)： | TSA1001IF |
| 廠商： | 意法半導(dǎo)體 |
| 英文描述： | 10-BIT, 25MSPS, 35mW A/D CONVERTER |
| 中文描述： | 10位，25Msps時(shí)為35mW的A / D轉(zhuǎn)換器 |
| 文件頁(yè)數(shù)： | 15/19頁(yè) |
| 文件大小： | 165K |
| 代理商： | TSA1001IF |
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TSA1001
15/19
External reference
It is possible to use an external reference voltage
instead of the internal one for specific applications
requiring even better linearity or enhanced
temperature behaviour. In this case, the amplitude
of the external voltage must be at least equal to
the
internal
one
STMicroelectronics Vref TS821 leads to optimum
performances when configured as shown on
Figure 8.
(1.03V).
Using
the
Figure 8 :
External reference setting
At 15Msps sampling frequency, 1MHz input fre-
quency and -1dBFS amplitude signal, perfor-
mances can be improved of up to 2dBc on SFDR
and 0.3dB on SINAD. At 25Msps sampling fre-
quency, 1MHz input frequency and -1dBFS ampli-
tude signal, performances can be improved of up
to 1dBc on SFDR and 0.5dB on SINAD.
This can be very helpful for example for multichan-
nel application to keep a good matching among
the sampling frequency range.
Clock input
The quality of your converter is very dependant on
your clock input accuracy, in terms of aperture jit-
ter; the use of low jitter crystal controlled oscillator
is recommended.
The duty cycle must be between 45% and 55%.
The clock power supplies must be separated from
the ADC output ones to avoid digital noise modu-
lation at the output.
It is recommended to always keep the circuit
clocked, even at the lowest specified sampling
frequency of 0.5Msps, before applying the supply
voltages.
Power consumption optimization
The internal architecture of the TSA1001 enables
to optimize the power consumption according to
the sampling frequency of the application. For this
purpose, a resistor is placed between IPOL and
the analog Ground pins.
The TSA1001 will combine highest performances
and lowest consumption at 25Msps when Rpol is
equal to 25k
.
At lower sampling frequency range (< 10Msps),
this value of resistor may be adjusted in order to
decrease the analog current without any
degradation of dynamic performances.
As an example, 10mW total power consumption is
achieved at 5 Msps with Rpol equal to 390k
.
The table below sums up the relevant data.
Total power consumption optimization
depending on Rpol value
Layout precautions
To use the ADC circuits in the best manner at high
frequencies, some precautions have to be taken
for power supplies:
- First of all, the implementation of 4 separate
proper supplies and ground planes (analog,
digital, internal and external buffer ones) on the
PCB is mandatory for high speed circuit
applications to provide low inductance and low
resistance common return.
The separation of the analog signal from the
digital part is essential to prevent noise from
coupling onto the input signal.
- Power supply bypass capacitors must be placed
as close as possible to the IC pins in order to
improve high frequency bypassing and reduce
harmonic distortion.
- Proper termination of all inputs and outputs must
be incorporated with output termination resistors;
then the amplifier load will be only resistive and
the stability of the amplifier will be improved. All
leads must be wide and as short as possible
especially for the analog input in order to decrease
parasitic capacitance and inductance.
- To keep the capacitive loading as low as
possible at digital outputs, short lead lengths of
routing are essential to minimize currents when
the output changes. To minimize this output
capacitance, buffers or latches close to the output
pins will relax this constraint.
- Choose component sizes as small as possible
(SMD).
1k
TSA1001
VINB
VIN
VREFM
VREFP
external
reference
TS821
VCCA
330pF
470nF
10nF
Fs (Msps)
Rpol (
k
)
Optimized
power (mW)
5
15
40
25
25
25
35
390
10
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| TSA1002 | 10-BIT, 50MSPS, 50mW A/D CONVERTER |
| TSA1002CF | 10-BIT, 50MSPS, 50mW A/D CONVERTER |
| TSA1002CFT | 10-BIT, 50MSPS, 50mW A/D CONVERTER |
| TSA1002IF | 10-BIT, 50MSPS, 50mW A/D CONVERTER |
| TSA1002IFT | 10-BIT, 50MSPS, 50mW A/D CONVERTER |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| TSA1001IFT | 制造商:STMICROELECTRONICS 制造商全稱(chēng):STMicroelectronics 功能描述:10-BIT, 25MSPS, 35mW A/D CONVERTER |
| TSA1002 | 制造商:STMICROELECTRONICS 制造商全稱(chēng):STMicroelectronics 功能描述:10-BIT, 50MSPS, 50mW A/D CONVERTER |
| TSA1002_04 | 制造商:STMICROELECTRONICS 制造商全稱(chēng):STMicroelectronics 功能描述:10-BIT, 50MSPS, 50mW A/D CONVERTER |
| TSA1002CF | 制造商:STMICROELECTRONICS 制造商全稱(chēng):STMicroelectronics 功能描述:10-BIT, 50MSPS, 50mW A/D CONVERTER |
| TSA1002CFT | 制造商:STMICROELECTRONICS 制造商全稱(chēng):STMicroelectronics 功能描述:10-BIT, 50MSPS, 50mW A/D CONVERTER |
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