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參數(shù)資料
| 型號(hào)： | MAX104 |
| 廠商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分類： | ADC |
| 英文描述： | 【5V, 1Gsps, 8-Bit ADC with On-Chip 2.2GHz Track/Hold Amplifier |
| 中文描述： | 1-CH 8-BIT FLASH METHOD ADC, PARALLEL ACCESS, PGA192 |
| 文件頁數(shù)： | 13/32頁 |
| 文件大小： | 637K |
| 代理商： | MAX104 |
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Princ iple of Operation
The MAX104’s flash or parallel architecture provides
the fastest multibit conversion of all common integrated
ADC designs. The key to this high-speed flash archi-
tecture is the use of an innovative, high-performance
comparator design. The flash converter and down-
stream logic translate the comparator outputs into a
parallel 8-bit output code and pass this binary code on
to the optional 8:16 demultiplexer, where primary and
auxiliary ports output PECL-compatible data at up to
500Msps per port (depending on how the demultiplex-
er section is set on the MAX104).
The ideal transfer function appears in Figure 2.
On-Chip T rac k/Hold Amplifier
As with all ADCs, if the input waveform is changing
rapidly during conversion, effective number of bits
(ENOB) and signal-to-noise ratio (SNR) specifications
will degrade. The MAX104’s on-chip, wide-bandwidth
(2.2GHz) T/H amplifier reduces this effect and increases
the ENOB performance significantly, allowing precise
capture of fast analog data at high conversion rates.
The T/H amplifier buffers the input signal and allows a
full-scale signal input range of ±250mV. The T/H ampli-
fier’s differential 50
input termination simplifies inter-
facing to the MAX104 with controlled impedance lines.
Figure 3 shows a simplified diagram of the T/H amplifier
stage internal to the MAX104.
Aperture width, delay, and jitter (or uncertainty) are
parameters that affect the dynamic performance of
high-speed converters. Aperture jitter, in particular,
directly influences SNR and limits the maximum slew
rate (dV/dt) that can be digitized without contributing
significant errors. The MAX104’s innovative T/H amplifier
design limits aperture jitter typically to less than 0.5ps.
Aperture Width
Aperture width (t
AW
) is the time the T/H circuit requires
(Figure 4) to disconnect the hold capacitor from the
input circuit (for instance, to turn off the sampling
bridge and put the T/H unit in hold mode).
Aperture Jitter
Aperture jitter (t
AJ
) is the sample-to-sample variation
(Figure 4) in the time between the samples.
Aperture Delay
Aperture delay (t
AD
) is the time defined between the
rising edge of the sampling clock and the instant when
an actual sample is taken (Figure 4).
Internal Referenc e
The MAX104 features an on-chip +2.5V precision
bandgap reference, which can be used by connecting
M
±5V, 1Gsps, 8-Bit ADC with
On-Chip 2.2GHz Trac k/Hold Amplifier
______________________________________________________________________________________
13
(
0
+
(
255
255
254
129
128
127
126
3
2
1
0
ANALOG INPUT
OVERRANGE +
D
Figure 2. Transfer Function
HOLD
CLK
ANALOG
INPUT
SAMPLED
DATA (T/H)
T/H
t
AW
t
AD
t
AJ
TRACK
TRACK
APERTURE DELAY (t
AD
)
APERTURE WIDTH (t
AW
)
APERTURE JITTER (t
AJ
)
CLK
Figure 4. T/H Aperture Timing
TO
COMPARATORS
TO
COMPARATORS
BUFFER
AMPLIFIER
INPUT
AMPLIFIER
CLOCK
SPLITTER
ALL INPUTS ARE ESD PROTECTED
(NOT SHOWN IN THIS
SIMPLIFIED DRAWING).
SAMPLING
BRIDGE
GNDI
50
50
VIN+
VIN-
GNDI
C
HOLD
50
50
CLK+
CLK-
CLKCOM
Figure 3. Internal Structure of the 2.2GHz T/H Amplifier
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX1040 | 制造商:MAXIM 制造商全稱:Maxim Integrated Products 功能描述:10-Bit, Multichannel ADCs/DACs with FIFO, Temperature Sensing, and GPIO Ports |
| MAX1040_08 | 制造商:MAXIM 制造商全稱:Maxim Integrated Products 功能描述:10-Bit, Multichannel ADCs/DACs with FIFO, Temperature Sensing, and GPIO Ports |
| MAX1040BETX | 功能描述:ADC / DAC多通道 RoHS:否 制造商:Texas Instruments 轉(zhuǎn)換速率: 分辨率:8 bit 接口類型:SPI 電壓參考: 電源電壓-最大:3.6 V 電源電壓-最小:2 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-40 |
| MAX1040BETX+ | 功能描述:ADC / DAC多通道 10Bit AD/DACs w/FIFO Temp Sns & GPIO Port RoHS:否 制造商:Texas Instruments 轉(zhuǎn)換速率: 分辨率:8 bit 接口類型:SPI 電壓參考: 電源電壓-最大:3.6 V 電源電壓-最小:2 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-40 |
| MAX1040BETX+T | 功能描述:ADC / DAC多通道 10Bit AD/DACs w/FIFO Temp Sns & GPIO Port RoHS:否 制造商:Texas Instruments 轉(zhuǎn)換速率: 分辨率:8 bit 接口類型:SPI 電壓參考: 電源電壓-最大:3.6 V 電源電壓-最小:2 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-40 |
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