- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄370009 > PM7524 (Analog Devices, Inc.) CMOS 8-Bit Buffered Multiplying DAC PDF資料下載
參數(shù)資料
| 型號(hào)： | PM7524 |
| 廠商： | Analog Devices, Inc. |
| 英文描述： | CMOS 8-Bit Buffered Multiplying DAC |
| 中文描述： | 的CMOS 8位緩沖乘法DAC |
| 文件頁數(shù)： | 4/8頁 |
| 文件大?。?/td> | 175K |
| 代理商： | PM7524 |
AD7524
REV. B
–4–
WRIT E MODE
When
CS
and
WR
are both LOW, the AD7524 is in the
WRIT E mode, and the AD7524 analog output responds to data
activity at the DB0–DB7 data bus inputs. In this mode, the
AD7524 acts like a nonlatched input D/A converter.
HOLD MODE
When either
CS
or
WR
is HIGH, the AD7524 is in the HOLD
mode. T he AD7524 analog output holds the value correspond-
ing to the last digital input present at DB0–DB7 prior to
WR
or
CS
assuming the HIGH state.
MODE SE LE CT ION T ABLE
CS
WR
Mode
DAC Response
L
L
Write
DAC responds to data bus
(DB0–DB7) inputs.
H
X
Hold
Data bus (DB0–DB7) is
Locked Out:
X
H
Hold
DAC holds last data present
when
WR
or
CS
assumed
HIGH state.
L = Low State, H = High State, X = Don't Care.
WRIT E CY CLE T IMING DIAGRAM
Figure 3. Supply Current vs. Logic Level
T ypical plots of supply current, I
DD
, versus logic input voltage,
V
IN
, for V
DD
= +5 V and V
DD
= +15 V are shown above.
CIRCUIT DE SCRIPT ION
CIRCUIT INFORMAT ION
T he AD7524, an 8-bit multiplying D/A converter, consists of a
highly stable thin film R-2R ladder and eight N-channel current
switches on a monolithic chip. Most applications require the
addition of only an output operational amplifier and a voltage
or current reference.
T he simplified D/A circuit is shown in Figure 1. An inverted
R-2R ladder structure is used—that is, the binarily weighted
currents are switched between the OUT 1 and OUT 2 bus lines,
thus maintaining a constant current in each ladder leg indepen-
dent of the switch state.
Figure 1. Functional Diagram
E QUIVALE NT CIRCUIT ANALY SIS
T he equivalent circuit for all digital inputs LOW is shown in
Figures 2. In Figure 2 with all digital inputs LOW, the refer-
ence current is switched to OUT 2. T he current source I
LEAK AGE
is composed of surface and junction leakages to the substrate
1
256
current source represents a constant 1-bit cur-
rent drain through the termination resistor on the R-2R ladder.
T he “ON” capacitance of the output N-channel switches is
120 pF, as shown on the OUT 2 terminal. T he “OFF” switch
capacitance is 30 pF, as shown on the OUT 1 terminal. Analysis
of the circuit for all digital inputs high is similar to Figure 2
however, the “ON” switches are now on terminal OUT 1, hence
the 120 pF appears at that terminal.
while the
Figure 2. AD7524 DAC Equivalent Circuit—All Digital
Inputs Low
INT E RFACE LOGIC INFORMAT ION
MODE SE LE CT ION
AD7524 mode selection is controlled by the
CS
and
WR
inputs.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| PM7574 | CMOS uP-COMPATIBLE 8-BIT DAC |
| PM75CSAJ120 | Analog IC |
| PM75CSE120 | Controller Miscellaneous - Datasheet Reference |
| PM75DHA120 | TRANSISTOR | IGBT POWER MODULE | HALF BRIDGE | 1.2KV V(BR)CES | 75A I(C) |
| PM75RHA060 | TRANSISTOR | IGBT POWER MODULE | 3-PH BRIDGE | 600V V(BR)CES | 75A I(C) |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| PM75240054Q | 制造商:Analog Devices 功能描述: |
| PM7524AQ | 制造商:Rochester Electronics LLC 功能描述:- Bulk 制造商:Analog Devices 功能描述: |
| PM7524BQ/883C | 制造商:Analog Devices 功能描述: |
| PM7524BRC/883 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:8-Bit Digital-to-Analog Converter |
| PM7524BRC/883C | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
發(fā)布緊急采購(gòu)，3分鐘左右您將得到回復(fù)。