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參數(shù)資料
| 型號： | THS14F03EVM |
| 廠商： | Texas Instruments, Inc. |
| 英文描述： | THS14F03EVM(THS14F03評估板) |
| 中文描述： | THS14F03EVM（THS14F03評估板） |
| 文件頁數(shù)： | 19/39頁 |
| 文件大?。?/td> | 523K |
| 代理商： | THS14F03EVM |
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Circuit Function
3-2
3.1
Circuit Function
The following paragraphs describe the function of the individual circuits. Refer
to the relevant data sheet for device operating characteristics.
3.1.1
Inputs and Outputs
The ADC has differential analog inputs. These are provided via SMB connec-
tors J10 and J11 on the EVM, and can be configured in two ways:
For true differential input, the positive differential signal is connected to
J10 and the negative differential signal is connected to J11. The jumpers
on the board are then configured as: H7 (1–2), H8 (2–3), and H9 (1–2).
The inputs have 50-
terminators.
For single-ended input, a positive signal is applied to connector J10. The
jumpers on the board are then configured as: H7 (2–3), H8 (1–2), and H9
(2–3). Transformer T2 performs the single-ended to differential signal con-
version. In this mode, the 50-
terminators R27 and R28 perform imped-
ance matching to attain the best distortion performance, but the signal
source must be able to drive the 25-
load. A 50-
source can be used
if R27 is removed from the board, with a resulting marginal increase in dis-
tortion.
SMB connector J3 can be used to input a clock signal to the board from an ex-
ternal source. If the source is not at the correct dc level required to input to the
74AHC14 hex inverter IC (U7), then it can be ac-coupled through C21, with the
dc level trimmed using potentiometer P1 if necessary.
The EVM is designed to comply with the TI TMS320C6000 daughtercard
specification. The pinout used is listed in Tables 3–1 and 3–2. In order to make
the EVM compatible with both the TMS320C6XXX and TMS320C5XXX
motherboard design environments, the EVM chip enable is derived from the
following sources:
OUT_CE (J1 P78) for the TMS320C6XXX, by inserting a jumper link in
position 2–3 of H15.
OUT_IS (J2 P70) for the TMS320C5XXX, by inserting a jumper link in
position 1–2 of H15.
For further explanation of the daughtercard connector interface, refer to the
relevant motherboard user’s guide or daughtercard specification.
Buffers U1, U2, and U3 are used to avoid bus contention and provide a degree
of noise isolation from the DSP motherboard.
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| THS14F03IPFB | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 14-bit 3 MSPS with 32-word FIFO 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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