參數(shù)資料
型號(hào)： ADS1601
元件分類(lèi)： ADC
英文描述： 16-BIT 1.25MSPS ANALOG TO DIGITAL CONVERTER
中文描述： 16位1.25MSPS時(shí)模數(shù)轉(zhuǎn)換器
文件頁(yè)數(shù)： 18/26頁(yè)
文件大?。?/td> 386K
代理商： ADS1601
SBAS322 DECEMBER 2004
www.ti.com
18
CLOCK INPUT (CLK)
The ADS1601 requires an external clock signal to be
applied to the CLK input pin. The sampling of the
modulator is controlled by this clock signal. As with any
high-speed data converter, a high quality clock is essential
for optimum performance. Crystal clock oscillators are the
recommended CLK source; other sources, such as
frequency synthesizers, are usually inadequate. Make
sure to avoid excess ringing on the CLK input; keeping the
trace as short as possible will help.
Measuring high-frequency, large amplitude signals
requires tight control of clock jitter. The uncertainty during
sampling of the input from clock jitter limits the maximum
achievable SNR. This effect becomes more pronounced
with higher frequency and larger magnitude inputs.
Fortunately, the ADS1601 oversampling topology reduces
clock jitter sensitivity over that of Nyquist rate converters
such as pipeline and successive approximation
converters by a factor of
16
.
In order to not limit the ADS1601 SNR performance, keep
the jitter on the clock source below the values shown in
Table 1. When measuring lower frequency and lower
amplitude inputs, more CLK jitter can be tolerated. In
determining the allowable clock source jitter, select the
worst-case input (highest frequency, largest amplitude)
that will be seen in the application.
Table 1. Maximum Allowable Clock Source Jitter
for Different Input Signal Frequencies and
Amplitude
INPUT SIGNAL
MAXIMUM
ALLOWABLE
CLOCK SOURCE
JITTER
MAXIMUM
FREQUENCY
MAXIMUM
AMPLITUDE
500kHz
0.5dB
6ps
500kHz
20dB
60ps
100kHz
0.5dB
30ps
100kHz
20dB
300ps
DATA FORMAT
The 16-bit output data is in binary two’s complement
format as shown in Table 2. When the input is positive
out-of-range, exceeding the positive full-scale value of
V
REF
, the output clips to all 7FFFh and the OTR output
goes high.
Likewise, when the input is negative out-of-range by going
below the negative full-scale value of –V
REF
, the output
clips to 8000h and the OTR output goes high. The OTR
remains high while the input signal is out-of-range.
Table 2. Output Code Versus Input Signal
INPUT SIGNAL
(INP – INN)
IDEAL OUTPUT
CODE(1)
OTR
≥
+VREF (> 0dB)
VREF (0dB)
7FFFh
1
7FFFh
0
+V
REF
2
15
1
0001h
0
0
0000h
0
V
REF
2
15
1
FFFFh
0
V
REF
2
15
2
15
1
8000h
0
V
REF
2
15
2
15
1
8000h
1
(1)Excludes effects of noise, INL, offset and gain errors.
OUT-OF-RANGE INDICATION (OTR)
If the output code exceeds the positive or negative
full-scale, the out-of-range digital output OTR will go high
on the falling edge of SCLK. When the output code returns
within the full-scale range, OTR returns low on the falling
edge of SCLK.
DATA RETRIEVAL
Data retrieval is controlled through a simple serial
interface. The interface operates in a master fashion by
outputting both a frame sync indicator (FSO) and a serial
clock (SCLK). Complementary outputs are provided for
the frame sync output (FSO), serial clock (SCLK) and data
output
(DOUT).
When
complementary outputs unconnected.
not
needed,
leave
the
相關(guān)PDF資料
PDF描述
ADS1601IPFBR 16-BIT 1.25MSPS ANALOG TO DIGITAL CONVERTER
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
ADS1601EVM 功能描述:數(shù)據(jù)轉(zhuǎn)換 IC 開(kāi)發(fā)工具 ADS1601EVM Eval Mod RoHS:否 制造商:Texas Instruments 產(chǎn)品:Demonstration Kits 類(lèi)型:ADC 工具用于評(píng)估:ADS130E08 接口類(lèi)型:SPI 工作電源電壓:- 6 V to + 6 V
ADS1601IPFBR 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 16-Bit 1.25MSPS RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 結(jié)構(gòu):Sigma-Delta 轉(zhuǎn)換速率:125 SPs to 8 KSPs 分辨率:24 bit 輸入類(lèi)型:Differential 信噪比:107 dB 接口類(lèi)型:SPI 工作電源電壓:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-32
ADS1601IPFBRG4 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 16-Bit 1.25MSPS RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 結(jié)構(gòu):Sigma-Delta 轉(zhuǎn)換速率:125 SPs to 8 KSPs 分辨率:24 bit 輸入類(lèi)型:Differential 信噪比:107 dB 接口類(lèi)型:SPI 工作電源電壓:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-32
ADS1601IPFBT 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 16-Bit 1.25MSPS RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 結(jié)構(gòu):Sigma-Delta 轉(zhuǎn)換速率:125 SPs to 8 KSPs 分辨率:24 bit 輸入類(lèi)型:Differential 信噪比:107 dB 接口類(lèi)型:SPI 工作電源電壓:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-32
ADS1601IPFBTG4 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 16-Bit 1.25MSPS RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 結(jié)構(gòu):Sigma-Delta 轉(zhuǎn)換速率:125 SPs to 8 KSPs 分辨率:24 bit 輸入類(lèi)型:Differential 信噪比:107 dB 接口類(lèi)型:SPI 工作電源電壓:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-32
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