- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄375239 > AD7836AS (ANALOG DEVICES INC) LC2MOS Quad 14-Bit DAC PDF資料下載
參數(shù)資料
| 型號： | AD7836AS |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | DAC |
| 英文描述： | LC2MOS Quad 14-Bit DAC |
| 中文描述： | PARALLEL, WORD INPUT LOADING, 16 us SETTLING TIME, 14-BIT DAC, PQFP44 |
| 封裝： | PLASTIC, MQFP-44 |
| 文件頁數(shù)： | 8/12頁 |
| 文件大?。?/td> | 174K |
| 代理商： | AD7836AS |
AD7836
–
8
–
REV. A
Unipolar Configuration
Figure 11 shows the AD7836 in the unipolar binary circuit con-
figuration. The V
REF
(+) input of the DAC is driven by the
AD586, a +5 V reference. V
REF
(–) is tied to ground. Table II
gives the code table for unipolar operation of the AD7836.
Other suitable references include the REF02, a precision 5 V
reference, and the REF195, a low dropout, micropower preci-
sion +5 V reference.
*ADDITIONAL PINS OMITTED FOR CLARITY
+15V
+5V
V
(0 TO +10V)
V
CC
2
6
8
5
4
SIGNAL
GND
C1
1nF
AGND
DGND
V
DD
V
OUT
V
REF(+)
V
REF(
–
)
V
SS
–
15V
R1
10k
AD7836
*
AD586
SIGNAL
GND
DUTGND
Figure 11. Unipolar +5 V Operation
Offset and gain may be adjusted in Figure 2 as follows: To ad-
just offset, disconnect the V
REF
(–) input from 0 V, load the DAC
with all 0s and adjust the V
REF
(–) voltage until V
OUT
= 0 V. For
gain adjustment, the AD7836 should be loaded with all 1s and
R1 adjusted until V
OUT
= 10 V(16383/16384) = 9.999389.
Many circuits will not require these offset and gain adjustments. In
these circuits R1 can be omitted. Pin 5 of the AD586 may be left
open circuit and Pin 2 (V
REF
(–)) of the AD7836 tied to 0 V.
Table II. Code Table for Unipolar Operation
Binary Number in DAC Latch
MSB
LSB
Analog Output
(V
OUT
)
11
10
01
00
00
1111
0000
1111
0000
0000
1111
0000
1111
0000
0000
1111
0000
1111
0001
0000
2 V
REF
(16383/16384) V
2 V
REF
(8192/16384) V
2 V
REF
(8191/16384) V
2 V
REF
(1/16384) V
0 V
NOTE
V
= V
(+); V
(–) = 0 V for unipolar operation.
For V
REF
(+) = +5 V, 1 LSB = +10 V/2
14
= +10 V/16384 = 610
μ
V.
Bipolar Configuration
Figure 12 shows the AD7836 set up for
±
10 V operation. The
AD588 provides precision
±
5 V tracking outputs that are fed to
the V
REF
(+) and V
REF
(–) inputs of the AD7836. The code table
for bipolar operation of the AD7836 is shown in Table III.
In Figure 12, full-scale and bipolar zero adjustments are pro-
vided by varying the gain and balance on the AD588. R2 varies
the gain on the AD588 while R3 adjusts the offset of both the
+5 V and –5 V outputs together with respect to ground.
For bipolar-zero adjustment, the DAC is loaded with
1000 . . . 0000 and R3 is adjusted until V
OUT
= 0 V. Full scale
is adjusted by loading the DAC with all 1s and adjusting R2 un-
til V
OUT
= 10(8191/8192) V = 9.998779 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.
*ADDITIONAL PINS OMITTED FOR CLARITY
Figure 12. Bipolar
±
5 V Operation
+15V
+5V
V
OUT
(
–
V
CC
AGND
DGND
V
DD
V
OUT
V
REF(+)
V
REF(
–
)
V
SS
–
15V
AD7836
*
SIGNAL
GND
DUTGND
6
3
4
C1
1 F
R2
100k
2
14
15
16
12
8
13
11
10
5
9
7
R3
100k
R1
39k
1
AD588
Table III. Code Table for Bipolar Operation
Binary Number in DAC Latch
MSB LSB
Analog Output
(V
OUT
)
11
10
10
01
00
00
1111
0000
0000
1111
0000
0000
1111
0000
0000
1111
0000
0000
1111
0001
0000
1111
0001
0000
2[V
REF
(–) + V
REF
(16383/16384)] V
2[V
REF
(–) + V
REF
(8193/16384)] V
2[V
REF
(–) + V
REF
(8192/16384)] V
2[V
REF
(–) + V
REF
(8191/16384)] V
2[V
REF
(–) + V
REF
(1/16384)] V
2[V
REF
(–)] V
NOTE
V
REF
= (V
REF
(+) – V
REF
(–)).
For V
REF
(+) = +5 V, and V
REF
(–) = –5 V, V
REF
=10 V, 1 LSB = 2 VREF V/2
14
= 20 V/16384 = 1220
μ
V.
CONTROLLED POWER-ON OF THE OUTPUT STAGE
A block diagram of the output stage of the AD7836 is shown in
Figure 13. It is capable of driving a load of 5 k
in parallel
with 50 pF. G
1
to G
6
are transmission gates that are used to
control the power on voltage present at V
OUT
. On power up G
1
and G
2
are also used in conjunction with the
CLR
input to set
V
OUT
to the user defined voltage present at the DUTGND pin.
When
CLR
is taken back high the DAC outputs reflect the data
in the DAC registers.
DAC
G
1
G
3
V
OUT
6k
G
6
G
4
G
5
G
2
DUTGND
R = 13.5k
R
Figure 13. Block Diagram of AD7836 Output Stage
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| AD7836 | Quad 14-Bit DAC(14位四通道D/A轉(zhuǎn)換器) |
| AD7837 | Complete, Dual 12-Bit MDACs(完備的雙12位乘法D/A轉(zhuǎn)換器) |
| AD7838 | Octal, 13-Bit Voltage-Output DAC with Parallel Interface(并行接口,8通道13位電壓輸出D/A轉(zhuǎn)換器) |
| AD7855 | 3 V to 5 V Single Supply, 600 kSPS 12-Bit Sampling ADCs(單電源,600kSPS12位采樣A/D轉(zhuǎn)換器) |
| AD7856AN | 5 V Single Supply, 8-Channel 14-Bit 285 kSPS Sampling ADC |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| AD7836ASZ | 功能描述:IC DAC 14BIT QUAD LC2MOS 44MQFP RoHS:是 類別:集成電路 (IC) >> 數(shù)據(jù)采集 - 數(shù)模轉(zhuǎn)換器 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標準包裝:1,000 系列:- 設(shè)置時間:1µs 位數(shù):8 數(shù)據(jù)接口:串行 轉(zhuǎn)換器數(shù)目:8 電壓電源:雙 ± 功率耗散（最大）:941mW 工作溫度:0°C ~ 70°C 安裝類型:表面貼裝 封裝/外殼:24-SOIC（0.295"，7.50mm 寬） 供應(yīng)商設(shè)備封裝:24-SOIC W 包裝:帶卷 (TR) 輸出數(shù)目和類型:8 電壓，單極 采樣率（每秒）:* |
| AD7837 | 制造商:AD 制造商全稱:Analog Devices 功能描述:LC2MOS Complete, Dual 12-Bit MDACs |
| AD7837AN | 功能描述:IC DAC 12BIT MULT DUAL 24-DIP RoHS:否 類別:集成電路 (IC) >> 數(shù)據(jù)采集 - 數(shù)模轉(zhuǎn)換器 系列:- 產(chǎn)品培訓(xùn)模塊:Data Converter Fundamentals DAC Architectures 標準包裝:750 系列:- 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: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:帶卷 (TR) 輸出數(shù)目和類型:1 電壓，單極；1 電壓，雙極 采樣率（每秒）:143k |
| AD7837AN/883B | 制造商:AD 制造商全稱:Analog Devices 功能描述:LC2MOS Complete, Dual 12-Bit MDACs |
| AD7837AN883B | 制造商:AD 制造商全稱:Analog Devices 功能描述:LC2MOS Complete, Dual 12-Bit MDACs |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。