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參數(shù)資料
| 型號： | AD7547 |
| 廠商： | Analog Devices, Inc. |
| 英文描述： | LC2MOS Parallel Load Dual 12-Bit DAC(LC2MOS并行載入雙12位D/A轉(zhuǎn)換器) |
| 中文描述： | LC2MOS并聯(lián)負載雙12位DAC（LC2MOS并行載入雙12位的D / A轉(zhuǎn)換器） |
| 文件頁數(shù)： | 4/8頁 |
| 文件大?。?/td> | 200K |
| 代理商： | AD7547 |
AD7547
REV. A
–4–
PIN CONFIGURAT IONS
LCCC
DIP, SOIC
PLCC
PIN FUNCT ION DE SCRIPT ION (DIP)
Pin
Mnemonic
Description
1
1
1
2
1
3
1
4
1
5
6–18
12
19
20
21
22
23
24
AGND
I
OUT A
R
FBA
V
REFA
CSA
DB0–DB11
DGND
WR
CSB
V
DD
V
REFB
R
FBB
I
OUT B
Analog Ground.
Current output terminal of DAC A.
Feedback resistor for DAC A.
Reference input to DAC A.
Chip Select Input for DAC A. Active low.
12 data inputs, DB0 (LSB)–DB11 (MSB).
Digital Ground.
Write Input. Data transfer occurs on rising edge of
WR
. See T able I.
Chip Select Input for DAC B. Active low.
Power supply input. Nominally +12 V to +15 V with
±
10% tolerance.
Reference input to DAC B.
Feedback resistor of DAC B.
Current output terminal of DAC B.
E QUIVALE NT CIRCUIT ANALY SIS
Figure 3 shows the equivalent circuit for one of the D/A con-
verters (DAC A) in the AD7547. A similar equivalent circuit
can be drawn for DAC B. Note that AGND is common to both
DAC A and DAC B.
Figure 3. Equivalent Analog Circuit for DAC A
C
OUT
is the output capacitance due to the N-channel switches
and varies from about 50 pF to 150 pF with digital input code.
T he current source I
LK G
is composed of surface and junction
leakages and approximately doubles every 10
°
C. R
O
is the
equivalent output resistance of the device which varies with
input code.
DIGIT AL CIRCUIT INFORMAT ION
T he digital inputs are designed to be both T T L and 5 V CMOS
compatible. All logic inputs are static-protected MOS gates
with typical input currents of less than 1 nA.
CIRCUIT INFORMAT ION
D/A SE CT ION
T he AD7547 contains two identical 12-bit multiplying D/A con-
verters. Each DAC consists of a highly stable R-2R ladder and
12 N-channel current steering switches. Figure 2 shows a simpli-
fied D/A circuit for DAC A. In the R-2R ladder, binary weighted
currents are steered between I
OUT A
and AGND. T he current
flowing in each ladder leg is constant, irrespective of switch
state. T he feedback resistor R
FBA
is used with an op amp (see
Figures 4 and 5) to convert the current flowing in I
OUT A
to a
voltage output.
Figure 2. Simplified Circuit Diagram for DAC A
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| AD7547BQ | 功能描述:IC DAC 12BIT DUAL LC2MOS 24-CDIP 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)品培訓模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標準包裝:1,000 系列:- 設置時間: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） 供應商設備封裝: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）:* |
| AD7547CQ | 功能描述:IC DAC 12BIT DUAL LC2MOS 24-CDIP 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)品培訓模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標準包裝:1,000 系列:- 設置時間: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） 供應商設備封裝: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）:* |
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