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參數(shù)資料
| 型號(hào)： | SPT7721SIT |
| 廠商： | FAIRCHILD SEMICONDUCTOR CORP |
| 元件分類： | ADC |
| 英文描述： | 8-BIT, 250 MSPS ADC WITH DEMUXED OUTPUTS |
| 中文描述： | 1-CH 8-BIT PROPRIETARY METHOD ADC, PARALLEL ACCESS, PQFP44 |
| 封裝： | TQFP-44 |
| 文件頁(yè)數(shù)： | 9/11頁(yè) |
| 文件大?。?/td> | 103K |
| 代理商： | SPT7721SIT |
9
11/8/01
SPT7721
POWER DOWN MODE
To save on power, the SPT7721 incorporates a power-
down function. This function is controlled by the signal on
pin PD. When pin PD is set high, the SPT7721 enters the
power-down mode. All outputs are set to high impedance.
In the power-down mode the SPT7721 dissipates 10 mW
typically.
REFERENCES
To save on parts count, design time, and PC board real
estate, the SPT7721 utilizes an internal reference. No
other external components are required to implement this
feature.
COMMON MODE VOLTAGE REFERENCE CIRCUIT
The SPT7721 has an on-board common-mode voltage
reference circuit (V
CM
). It is 2.5 volts and is capable of driv-
ing 50 μA loads typically. The circuit is commonly used to
drive the center tap of the RF transformer in fully differen-
tial applications. For single-ended applications, this output
can be used to provide the level shifting required for the
single-to-differential converter conversion circuit.
CLOCK INPUT
The clock input on the SPT7721 can be driven by either a
single-ended or double-ended clock circuit and can handle
TTL, PECL, and CMOS signals. When operating at high
sample rates it is important to keep the pulse width of the
clock signal as close to 50% as possible. For TTL/CMOS
single-ended clock inputs, the rise time of the signal also
becomes an important consideration.
DIGITAL OUTPUTS
The output circuitry of the SPT7721 has been designed to
be able to support three separate output modes. The
demuxed (double-wide) mode supports either parallel
aligned or interleaved data output. The single-channel
mode is not demuxed and can support direct output at
speeds up to 125 MSPS. The output format is straight
binary (table I).
Table I – Output Data Format
Analog Input
Output Code
D7–D0
1111 1111
1111 111
0000 000
0000 0000
+FS
+FS – 1/2 LSB
+1/2 FS
–FS + 1/2 LSB
–FS
indicates the flickering bit between logic 0 and 1
The data output mode is set using the DMODE
1
and
DMODE
2
inputs (pins 32 & 31 respectively). Table II
describes the mode switching options.
Table II – Output Data Modes
Output Mode
Parallel Dual Channel Output
Interleaved Dual Channel Output
Single Channel Data Output
(Bank A only 125 MSPS max)
DMODE
1
0
0
DMODE
2
0
1
1
X
EVALUATION BOARD
The EB7721/22 evaluation board is available to aid design-
ers in demonstrating the full performance of the SPT7721.
This board includes a clock driver and reset circuit, adjust-
able references and common mode, a single-ended to dif-
ferential input buffer and a single-ended to differential
transformer (1:1). An application note (AN7721/22) de-
scribing the operation of this board, as well as information
on the testing of the SPT7721, is also available. Contact
the factory for price and availability of the EB7721/22.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| SPT7722 | 8-bit, 250 MSPS A/D Converter with Demuxed Outputs |
| SPT7722SIT | 8-bit, 250 MSPS A/D Converter with Demuxed Outputs |
| SPT7725BIG | 8-BIT, 300 MSPS, FLASH A/D CONVERTER |
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| SPT7721SIT_Q | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 8-BIT 250 MSPS ADC 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 輸入類型:Differential 信噪比:107 dB 接口類型: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 |
| SPT7721SITX | 功能描述:直流/直流開(kāi)關(guān)轉(zhuǎn)換器 RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開(kāi)關(guān)頻率:1.5 MHz 輸出電壓:4.6 V 輸出電流:250 mA 輸出端數(shù)量:2 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT |
| SPT7722 | 制造商:FAIRCHILD 制造商全稱:Fairchild Semiconductor 功能描述:8-bit, 250 MSPS A/D Converter with Demuxed Outputs |
| SPT7722SIT | 功能描述:視頻模擬/數(shù)字化轉(zhuǎn)換器集成電路 8 Bit 250 MSPS ADC RoHS:否 制造商:Texas Instruments 輸入信號(hào)類型:Differential 轉(zhuǎn)換器數(shù)量:1 ADC 輸入端數(shù)量:4 轉(zhuǎn)換速率:3 Gbps 分辨率:8 bit 結(jié)構(gòu): 輸入電壓:3.3 V 接口類型:SPI 信噪比: 電壓參考: 電源電壓-最大:3.45 V 電源電壓-最小:3.15 V 最大功率耗散: 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:TCSP-48 封裝:Reel |
| SPT7722SIT_Q | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 8 BIT_ 250 MSPS ADC 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 輸入類型:Differential 信噪比:107 dB 接口類型: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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