參數(shù)資料
型號(hào)： THS0842PFB
廠商： Texas Instruments, Inc.
英文描述： DUAL-INPUT, 8-BIT, 40 MSPS LOW-POWER ANALOG-TO-DIGITAL CONVERTER WITH SINGLE OR DUAL PARALLEL BUS OUTPUT
中文描述： 雙輸入，8位，40 MSPS的低功耗模擬數(shù)字轉(zhuǎn)換器單路或雙路并行總線輸出
文件頁(yè)數(shù)： 27/29頁(yè)
文件大?。?/td> 479K
代理商： THS0842PFB
THS0842
DUAL-INPUT, 8-BIT, 40 MSPS LOW-POWER ANALOG-TO-DIGITAL CONVERTER
WITH SINGLE OR DUAL PARALLEL BUS OUTPUT
SLAS246 – DECEMBER 1999
27
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
PRINCIPLES OF OPERATION
THS0842
DA7
DA0
COUT
COUT
8
8
1D7
1D0
1Q7
1Q0
1D8
1D9
1Q8
1Q9
SN74LVC827A
SN74LVC374A
1D7
1D0
1Q7
1Q0
CLK
1D15
1D8
1Q15
1Q0
1D7
1D0
FIFO
HF Flag
WRTCLK
16
TMS320 DSP
INTR
Figure 27. Single Bus FIFO Connection to DSP Example
THS0842
DA7– DA0
FIFO
D16 – D9
D7 – D0
> WRTCLK
8
COUT
DSP
16
1Q15 – 1Q0
HF Flag
DB7– DB0
8
INTR
Figure 28. Dual Bus FIFO Connection to DSP Example
layout, decoupling and grounding rules
Proper grounding and layout of the PCB on which the THS0842 is populated are essential to achieve the stated
performance. It is advisable to use separate analog and digital ground planes that are spliced underneath the
device. The THS0842 has digital and analog terminals on opposite sides of the package to make this easier.
Since there is no internal connection between analog and digital grounds, they have to be joined on the PCB.
It is advisable to do this at one point in close proximity to the THS0842.
As for power supplies, separate analog and digital supply terminals are provided on the device (AV
DD
/DV
DD
).
The supply to the digital output drivers is kept separate also (DRV
DD
). Lowering the voltage on this supply to
3 V instead of the nominal 3.3 V improves performance because of the lower switching noise caused by the
output buffers.
Because of the high sampling rate and switched-capacitor architecture, THS0842 generates transients on the
supply and reference lines. Proper decoupling of these lines is essential. Decoupling as shown in the schematic
of the THS0842 EVM is recommended.
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