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參數(shù)資料
| 型號： | SPT7720SIT |
| 廠商： | Electronic Theatre Controls, Inc. |
| 英文描述： | 8-BIT, 200 MSPS A/D CONVERTER |
| 中文描述： | 8位，200 MSPS的A / D轉(zhuǎn)換 |
| 文件頁數(shù)： | 8/10頁 |
| 文件大?。?/td> | 96K |
| 代理商： | SPT7720SIT |
SPT
8
5/9/01
SPT7720
REFERENCES
To save on parts count, design time, and PC board real
estate, the SPT7720 utilizes an internal reference. No
other external components are required to implement this
feature.
VOLTAGE REFERENCE CIRCUIT
The SPT7720 has an on-board voltage reference circuit
(V
REF
). It is 2.5 volts and is capable of driving 50 μA loads
typically. The circuit is commonly used to drive the center
tap of the RF transformer in fully differential applications.
For single-ended applications, this output can be used to
provide the level shifting required for the single-to-differen-
tial converter conversion circuit.
ENCODE INPUT
The ENCODE input on the SPT7720 can be driven by ei-
ther a single-ended or differential 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 duty signal as close to 50% as possible. For TTL/
CMOS single-ended ENCODE inputs, the rise time of the
signal also becomes an important consideration. The
ENCODE input is 300
into a bipolar differential pair.
ENCODE
is internally biased to 1.5 V with a Thevenin
equivalent of 5.25 k
.
DIGITAL INPUTS
The DS input is 35
into one side of a differential pair.
There is a two-diode clamp from DS to
DS
in both direc-
tions.
DS
is biased to 1.5 V with a Thevenin equivalent of
5.25 k
.
The
DEMUX
pin is input to one side of a CMOS differential
pair. The other side is internally biased to 1.5 V and does
not connect to the outside.
DIGITAL OUTPUTS
The output circuitry of the SPT7720 has been designed to
be able to support two separate output modes. The
demuxed (double-wide) mode supports interleaved data
output. The single-channel mode is not demuxed and can
support direct output at speeds up to 100 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
DEMUX
input (pin
42). Table II describes the mode switching options.
Table II – Output Data Modes
Output Mode
Interleaved Dual Channel Output
Single Channel Data Output
(Bank A only 100 MSPS max)
DEMUX
0
1
EVALUATION BOARD
The EB7720 evaluation board is available to aid designers
in demonstrating the full performance of the SPT7720.
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 (AN7720) describ-
ing the operation of this board, as well as information on
the testing of the SPT7720, is also available. Contact the
factory for price and availability of the EB7720.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| SPT7720SITX | 功能描述:直流/直流開關(guān)轉(zhuǎn)換器 RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開關(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 安裝風格:SMD/SMT |
| SPT7721 | 制造商:FAIRCHILD 制造商全稱:Fairchild Semiconductor 功能描述:8-BIT, 250 MSPS ADC WITH DEMUXED OUTPUTS |
| SPT7721SIT | 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 |
| 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 安裝風格:SMD/SMT 封裝 / 箱體:VQFN-32 |
| SPT7721SITX | 功能描述:直流/直流開關(guān)轉(zhuǎn)換器 RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開關(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 安裝風格:SMD/SMT |
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