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参数资料
| 型号： | AD7523LN |
| 厂商： | INTERSIL CORP |
| 元件分类： | DAC |
| 英文描述： | 8-Bit, Multiplying D/A Converters |
| 中文描述： | PARALLEL, 8 BITS INPUT LOADING, 8-BIT DAC, PDIP16 |
| 封装： | PLASTIC, DIP-16 |
| 文件页数： | 4/9页 |
| 文件大小： | 99K |
| 代理商： | AD7523LN |
10-11
Detailed Description
The AD7523 and AD7533 are monolithic multiplying D/A
converters. A highly stable thin film R-2R resistor ladder
network and NMOS SPDT switches form the basis of the
converter circuit, CMOS level shifters permit low power
TTL/CMOS compatible operation. An external voltage or
current reference and an operational amplifier are all that is
required for most voltage output applications.
A simplified equivalent circuit of the DAC is shown in the
Functional Diagram. The NMOS SPDT switches steer the
ladder leg currents between I
OUT1
and I
OUT2
buses which
must be held at ground potential. This configuration main-
tains a constant current in each ladder leg independent of
the input code.
Converter errors are further reduced by using separate
metal interconnections between the major bits and the out-
puts. Use of high threshold switches reduce offset (leakage)
errors to a negligible level.
The level shifter circuits are comprised of three inverters with
positive feedback from the output of the second to the first,
see Figure 1. This configuration results in TTL/CMOS
compatible operation over the full military temperature
range. With the ladder SPDT switches driven by the level
shifter, each switch is binarily weighted for an ON resistance
proportional to the respective ladder leg current. This
assures a constant voltage drop across each switch,
creating equipotential terminations for the 2R ladder
resistors and high accurate leg currents.
Typical Applications
Unipolar Binary Operation - AD7523 (8-Bit DAC)
The circuit configuration for operating the AD7523 in
unipolar mode is shown in Figure 2. With positive and
negative V
REF
values the circuit is capable of 2-Quadrant
multiplication. The “Digital Input Code/Analog Output Value”
table for unipolar mode is given in Table 1.
NOTES:
1. R1 and R2 used only if gain adjustment is required.
2. CF1 protects AD7523 and AD7533 against negative transients.
FIGURE 2. UNIPOLAR BINARY OPERATION
Zero Offset Adjustment
1. Connect all digital inputs to GND.
2. Adjust the offset zero adjust trimpot of the output
operational amplifier for 0V
±
1mV (Max) at V
OUT
.
Gain Adjustment
1. Connect all digital inputs to V+.
2. Monitor V
OUT
for a -V
REF
(1
1
/
28
) reading.
3. To increase V
OUT
, connect a series resistor, R2, (0
to
250
) in the I
OUT1
amplifier feedback loop.
4. To decrease V
OUT
, connect a series resistor, R1, (0
to
250
) between the reference voltage and the V
REF
terminal.
V+
TTL/
CMOS INPUT
1 3
4
5
6
7
2
8
9
TO LADDER
I
OUT2
I
OUT1
FIGURE 1. CMOS SWITCH
TABLE 1. UNlPOLAR BINARY CODE - AD7523
DIGITAL INPUT
MSB
LSB
ANALOG OUTPUT
11111111
10000001
10000000
01111111
00000001
00000000
NOTE:
1.
.
15
16
1
4
11
3
2
AD7523/
AD7533
MSB
LSB
14
+15V
V
REF
GND
OUT1
OUT2
6
+
V
OUT
-
R
FEEDBACK
DATA
INPUTS
±
10V
R2
CR1
VREF
---------
–
VREF
---------
–
VREF
---------
–
----------------
–
=
VREF
---------
–
VREF
---------
–
VREF
---------
–
0
=
1 LSB
2
8
–
(
)
V
REF
(
)
---------
V
REF
(
)
=
=
AD7523, AD7533
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相关代理商/技术参数 |
参数描述 |
|---|---|
| AD7523SD | 制造商:未知厂家 制造商全称:未知厂家 功能描述:Converter IC |
| AD7523SN | 制造商:未知厂家 制造商全称:未知厂家 功能描述:Converter IC |
| AD7523TD | 制造商:未知厂家 制造商全称:未知厂家 功能描述:Converter IC |
| AD7523TD/HR | 制造商:未知厂家 制造商全称:未知厂家 功能描述:8-Bit Digital-to-Analog Converter |
| AD7523TN | 制造商:未知厂家 制造商全称:未知厂家 功能描述:Converter IC |
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