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參數(shù)資料
| 型號： | AD8600* |
| 廠商： | Analog Devices, Inc. |
| 英文描述： | 16-Channel. 8-Bit Multiplying DAC |
| 中文描述： | 16通道。 8位乘法DAC |
| 文件頁數(shù)： | 8/16頁 |
| 文件大?。?/td> | 236K |
REV. 0
–8–
AD8600
*Patent Pending.
Figure 14. Supply Current vs. Temperature
Figure 15. Output Voltage Drift
Accelerated by Burn-In
S
TEMPERATURE –
°
C
20
15
16
18
17
19
125
–50
–75
100
25
50
–25
0
75
V
CC
= +5V
V
EE
= –5V
V
REF
= 3.5V
χ
χ + 3σ
χ 3σ
T = HOURS OF OPERATION AT +125
°
C
C
1200
200
0
1000
600
800
400
χ
χ + 3σ
χ 3σ
V
CC
= +5V
V
EE
= –5V
V
= 3.5V
CODE = 00
H
–2
–4
0
2
4
1
3
5
–1
–3
–5
Operation
T he AD8600 is a 16-channel voltage output, 8-bit digital to
analog converter. T he AD8600 operates from a single +5 V
supply, or for a wider output swing range, the part can operate
from dual supplies of
±
5 V or
±
6 V or a single supply of +7 V.
T he DACs are based upon a unique R-2R ladder structure*
that removes the possibility of current injection from the refer-
ence to ground during code switching. Each of the 8-bit DACs
has an output amplifier to provide 16 low impedance outputs.
With a single external reference, 16 independent dc output lev-
els can be programmed through a parallel digital interface. T he
interface includes 4 bits of address (A0–A3), 8 bits of data
(DB0–DB7), a read/write select pin (R/
W
), an enable clock
strobe (
EN
), a DAC register load strobe (
LD
), and a chip select
pin (
CS
). Additionally a reset pin (
RS
) is provided to asynchro-
nously reset all 16 DACs to 0 V output.
D/A Converter Section
T he internal DAC is an 8-bit voltage mode devicewith an out-
put that swings from DACGND to the external reference volt-
age, V
REF
. T he equivalent schematic of one of the DACs is
shown in Figure 16. T he DAC uses an R-2R ladder to ensure
accuracy and linearity over the full temperature range of the part.
T he switches shown are actually N and P-channel MOSFET s to
allow maximum flexibility and range in the choice of reference
R
R
R
V
OUT
R
R
R
2R
R
R
R
R
R
TO 15
DACs
V
REF
DACGND
*R = 30k
TYPICALLY
Figure 16. Equivalent Schematic of Analog Channel
voltage. T he switches’ low ON resistance and matching is im-
portant in maintaining the accuracy of the R-2R ladder.
Amplifier Section
T he output of the DAC ladder is buffered by a rail-to-rail out-
put amplifier. T his amplifier is configured as a unity gain fol-
lower as shown in Figure 16. T he input stage of the amplifier
contains a PNP differential pair to provide low offset drift and
noise. T he output stage is shown in Figure 17. It employs
complementary bipolar transistors with their collectors con-
nected to the output to provide rail-to-rail operation. T he NPN
transistor enters into saturation as the output approaches the
negative rail. T hus, in single supply, the output low voltage is
limited by the saturation voltage of the transistor. For the tran-
sistors used in the AD8600, this is approximately 40 mV. T he
AD8600 was not designed to swing to the positive rail in con-
trast to some of ADI’s other DACs (for example, the AD8582).
T he output stage of the amplifier is actually capable of swinging
to the positive rail, but the input stage limits this swing to ap-
proximately 1.0 V below V
CC
.
V
EE
V
OUT
V
CC
Figure 17. Equivalent Analog Output Circuit
During normal operation, the output stage can typically source
and sink
±
1 mA of current. However, the actual short circuit
current is much higher. In fact, each DAC is capable of sourc-
ing 20 mA and sinking 8 mA during a short condition. T he
absolute maximum ratings state that, at most, four DACs can
be shorted simultaneously. T his restriction is due to current
densities in the metal traces. If the current density is too high,
voltage drops in the traces will cause a loss in linearity perfor-
mance for the other DACs in the package. T hus to ensure long-
term reliability, no more than four DACs should be shorted
simultaneously.
相關PDF資料 |
PDF描述 |
|---|---|
| AD8600 | 16-Channel, 8-Bit Multiplying DAC |
| AD8600AP | 16-Channel, 8-Bit Multiplying DAC |
| AD8600CHIPS | 16-Channel, 8-Bit Multiplying DAC |
| AD8601ART | Precision CMOS Single Supply Rail-to-Rail Input/Output Wideband Operational Amplifiers |
| AD8601DRT | Precision CMOS Single Supply Rail-to-Rail Input/Output Wideband Operational Amplifiers |
相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| AD8600AP | 制造商:Analog Devices 功能描述:DAC 16-CH R-2R 8-bit 44-Pin PLCC 制造商:Rochester Electronics LLC 功能描述:16 CHANNEL 8-BIT MULT.DAC - Bulk 制造商:Analog Devices 功能描述:Digital-Analog Converter IC Interface Ty |
| AD8600AP-REEL | 制造商:Analog Devices 功能描述:DAC 16-CH R-2R 8-bit 44-Pin PLCC T/R 制造商:Rochester Electronics LLC 功能描述:16 CHANNEL 8-BIT MULT.DAC - Tape and Reel |
| AD8600APZ | 功能描述:IC DAC MULT 16CH 8BIT 44PLCC RoHS:是 類別:集成電路 (IC) >> 數(shù)據(jù)采集 - 數(shù)模轉換器 系列:- 標準包裝:1 系列:- 設置時間:4.5µs 位數(shù):12 數(shù)據(jù)接口:串行，SPI? 轉換器數(shù)目:1 電壓電源:單電源 功率耗散（最大）:- 工作溫度:-40°C ~ 125°C 安裝類型:表面貼裝 封裝/外殼:8-SOIC（0.154"，3.90mm 寬） 供應商設備封裝:8-SOICN 包裝:剪切帶 (CT) 輸出數(shù)目和類型:1 電壓，單極；1 電壓，雙極 采樣率（每秒）:* 其它名稱:MCP4921T-E/SNCTMCP4921T-E/SNRCTMCP4921T-E/SNRCT-ND |
| AD8600APZ-REEL | 功能描述:IC DAC MULT 16CH 8BIT 44PLCC RoHS:是 類別:集成電路 (IC) >> 數(shù)據(jù)采集 - 數(shù)模轉換器 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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