參數(shù)資料
型號(hào)： AD7846KPZ
廠商： Analog Devices Inc
文件頁(yè)數(shù)： 6/24頁(yè)
文件大小： 0K
描述： IC DAC 16BIT LC2MOS VOUT 28PLCC
產(chǎn)品培訓(xùn)模塊： Data Converter Fundamentals
DAC Architectures
標(biāo)準(zhǔn)包裝： 1
設(shè)置時(shí)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： 表面貼裝
封裝/外殼： 28-LCC（J 形引線）
供應(yīng)商設(shè)備封裝： 28-PLCC（11.51x11.51）
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
產(chǎn)品目錄頁(yè)面： 785 (CN2011-ZH PDF)
AD7846
Rev. G | Page 14 of 24
BIPOLAR OPERATION
Figure 24 shows the AD7846 set up for ±10 V bipolar operation.
The AD588 provides precision ±5 V tracking outputs that are
fed to the VREF+ and VREF inputs of the AD7846. The code table
for Figure 24 is shown in Table 9.
DGND
+15V
+5V
VDD
VSS
VCC
VOUT
RIN
VREF+
VREF–
R2
10k
C1
1F
SIGNAL
GROUND
–15V
*ADDITIONAL PINS OMITTED FOR CLARITY
AD7846*
AD588
VOUT
(–10V TO +10V)
+15V
–15V
R3
100k
R1
39k
+15V
4
21
9
5
6
20
7
2
3
1
14
15
16
13
8
12
11
10
5
9
7
46
8
0
84
90
-0
24
Figure 24. Bipolar ±10 V Operation
Table 9. Offset Binary Code Table for Figure 24
Binary Number in DAC Latch
MSB
LSB1
Analog Output (VOUT)
1111 1111 1111 1111
+10 (32,767/32,768) V
1000 0000 0000 0001
+10 (1/32,768) V
1000 0000 0000 0000
0 V
0111 1111 1111 1111
10 (1/32,768) V
0000 0000 0000 0000
10 (32,768/32,768) V
1 LSB = 10 V/215 = 10 V/32,768 = 305 μV.
Full-scale and bipolar zero adjustment are provided by varying
the gain and balance on the AD588. R2 varies the gain on the
AD588 while R3 adjusts the +5 V and 5 V outputs together
with respect to ground.
For bipolar zero adjustment on the AD7846, load the DAC with
100…000 and adjust R3 until VOUT = 0 V. Full scale is adjusted
by loading the DAC with all 1s and adjusting R2 until VOUT =
9.999694 V.
When bipolar zero and full-scale adjustment are not needed, R2
and R3 can be omitted, Pin 12 on the AD588 should be connected
to Pin 11, and Pin 5 should be left floating. If a user wants a 5 V
output range, there are two choices. By tying Pin 6 (RIN) of the
AD7846 to VOUT (Pin 5), the output stage gain is reduced to
unity and the output range is ±5 V. If only a positive 5 V reference
is available, bipolar ±5 V operation is still possible. Tie VREF to
0 V and connect RIN to VREF+. This also gives a ±5 V output
range. However, the linearity, gain, and offset error specifications
are the same as the unipolar 0 V to 5 V range.
MULTIPLYING OPERATION
The AD7846 is a full multiplying DAC. To obtain four-quadrant
multiplication, tie VREF to 0 V, apply the ac input to VREF+, and
tie RIN to VREF+. Figure 11 shows the large signal frequency
response when the DAC is used in this fashion.
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