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參數(shù)資料
| 型號： | EVAL-AD7841EBZ |
| 廠商： | Analog Devices Inc |
| 文件頁數(shù)： | 4/13頁 |
| 文件大?。?/td> | 0K |
| 描述： | BOARD EVAL FOR AD7841 |
| 產(chǎn)品培訓(xùn)模塊： | DAC Architectures |
| 標(biāo)準(zhǔn)包裝： | 1 |
| DAC 的數(shù)量： | 8 |
| 位數(shù)： | 14 |
| 采樣率（每秒）： | 32k |
| 數(shù)據(jù)接口： | 并聯(lián) |
| 設(shè)置時間： | 31µs |
| DAC 型： | 電壓 |
| 工作溫度： | -40°C ~ 85°C |
| 已供物品： | 板，CD |
| 已用 IC / 零件： | AD7841 |
| 相關(guān)產(chǎn)品： | AD7841BSZ-REEL-ND - IC DAC 14BIT OCTAL VOUT 44-MQFP AD7841ASZ-REEL-ND - IC DAC 14BIT OCTAL VOUT 44-MQFP AD7841BSZ-ND - IC DAC 14BIT OCTAL V-OUT 44-MQFP AD7841ASZ-ND - IC DAC 14BIT OCTAL V-OUT 44MQFP |
AD7841
–12–
GND
VDD
8/10-BIT
DAC
GND
VDD
8/10-BIT
DAC
LOGIC LEVEL
SHIFT
+5V
5V
SCLK
D IN
FSIN/CS
SCLK
D IN
FSIN/CS
0V TO +5V
0V TO
5V
VREF(+)AB
A0, A1, A2
VOUTA
VOUTB
VREF( )AB
AD7841*
GND
DATA BUS
ADDR
DECODER
ADDR BUS
SDATA
SCLK
DATA BUS
CONTROLLER
*ADDITIONAL PINS OMITTED FOR CLARITY
Figure 13. Programmable Reference Generation for the AD7841
The AD8803 has an output voltage range of GND to VDD (0 V
to 5 V). To trim the VREF(+) input, the appropriate trim range
on the AD8803 DAC can be set using the VREFL and VREFH pins
allowing 8 bits of resolution between the two points. This will
allow the VREF(+) pin to be adjusted to remove gain errors.
To trim the VREF(–) voltage, some method of providing a trim
voltage in the required negative voltage range is required. Neither
the AD7804 or the AD8803 can provide this range in normal
operation as their output range is 0 V to 5 V. There are two
methods of producing this negative voltage. One method is to
provide a positive output voltage and then to level shift that ana-
log voltage to the required negative range. Alternatively these
DACs can be operated with supplies of 0 V and –5 V, with the
VDD pin connected to 0 V and the GND pin connected to –5 V.
Now these can be used to provide the negative reference volt-
ages for the VREF(–) inputs on the AD7841. However, the digital
signals driving the DACs need to be level-shifted from the 0 V
to +5 V range to the –5 V to 0 V range. Figure 13 shows a
typical application circuit to provide programmable reference
capabilities for the AD7841.
REV. B
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