參數(shù)資料
型號: AD7846KN
廠商: Analog Devices Inc
文件頁數(shù): 5/24頁
文件大?。?/td> 0K
描述: IC DAC 16BIT LC2MOS VOUT 28-DIP
產(chǎn)品培訓(xùn)模塊: Data Converter Fundamentals
DAC Architectures
標(biāo)準(zhǔn)包裝: 13
設(shè)置時間: 7µs
位數(shù): 16
數(shù)據(jù)接口: 并聯(lián)
轉(zhuǎn)換器數(shù)目: 1
電壓電源: 雙 ±
功率耗散(最大): 100mW
工作溫度: 0°C ~ 70°C
安裝類型: 通孔
封裝/外殼: 28-DIP(0.600",15.24mm)
供應(yīng)商設(shè)備封裝: 28-PDIP
包裝: 管件
輸出數(shù)目和類型: 1 電壓,單極;1 電壓,雙極
采樣率(每秒): 143k
AD7846
Rev. G | Page 13 of 24
UNIPOLAR BINARY OPERATION
Figure 23 shows the AD7846 in the unipolar binary circuit
configuration. The DAC is driven by the AD586 +5 V reference.
Because RIN is tied to 0 V, the output amplifier has a gain of 2
and the output range is 0 V to +10 V. If a 0 V to +5 V range is
required, RIN should be tied to VOUT, configuring the output
stage for a gain of 1. Table 8 gives the code table for the circuit
RIN
VOUT
DGND
+15V
+5V
VCC
VDD
VREF+
VREF–
R1
10k
C1
1F
SIGNAL
GROUND
–15V
*ADDITIONAL PINS
OMITTED FOR CLARITY
AD7846*
AD586
VOUT
(0V TO +10V)
VSS
2
5
4
67
21
5
20
6
4
8
08490
-0
23
Figure 23. Unipolar Binary Operation
Table 8. Code Table for Figure 23
Binary Number in DAC Latch
MSB
LSB1
Analog Output (VOUT)
1111 1111 1111 1111
+10 (65,535/65,536) V
1000 0000 0000 0000
+10 (32,768/65,536) V
0000 0000 0000 0001
+10 (1/65,536) V
0000 0000 0000 0000
0 V
1 LSB = 10 V/216 = 10 V/65,536 = 152 μV.
Offset and gain can be adjusted in Figure 23 as follows:
To adjust offset, disconnect the VREF input from 0 V, load
the DAC with all 0s, and adjust the VREF voltage until VOUT
= 0 V.
For gain adjustment, the AD7846 should be loaded with all
1s and R1 adjusted until VOUT = 10 (65,535)/(65,536) =
9.999847 V. If a simple resistor divider is used to vary the
VREF voltage, it is important that the temperature
coefficients of these resistors match that of the DAC input
introduced over temperature. Many circuits do not require
these offset and gain adjustments. In these circuits, R1 can
be omitted. Pin 5 of the AD586 can be left open circuit and
Pin 8 (VREF) of the AD7846 tied to 0 V.
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