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參數(shù)資料
| 型號： | ML2340 |
| 廠商： | Fairchild Semiconductor Corporation |
| 英文描述： | Single Supply, Programmable 8-Bit D/A Converters(單電源可編程8位D/A轉(zhuǎn)換器) |
| 中文描述： | 單電源，可編程8位D / A轉(zhuǎn)換器（單電源可編程8位的D / A轉(zhuǎn)換器） |
| 文件頁數(shù)： | 7/12頁 |
| 文件大小： | 182K |
| 代理商： | ML2340 |
ML2340, ML2350
REV. 1.0 10/10/2000
7
1.0 FUNCTIONAL DESCRIPTION
1.1 D/A CONVERTER
The D/A converter is implemented using an array of equal
current sources that are decoded semi-linearly for the four
most significant bits to improve differential linearity and to
reduce output glitch around major carries. See Figure 4.
The input voltage reference of the D/A converter is the
difference between V
REF IN
and AGND. This difference
voltage is converted to a reference current using an
internal resistor to set up the appropriate current level in
Figure 4. D/A Converter Implementation
4I
4I
4I
2I
I
I
4-BIT
DIVIDER
DAC
OUT
DAC
OUT
V
CC
1.2 SINGLE-SUPPLY vs. DUAL-SUPPLY OPERATION
ML2340 and ML2350 can be powered from a single
supply ranging from 4.5V to 13.2V or dual supplies
ranging from
±
2.25V to
±
6.6V.
The internal digital and analog circuitry is powered
between V
CC
and AGND. The range of DGND is
AGND
≤
DGND
≤
V
CC
– 4.5V with the logic thresholds
set between 0.8V and 2.0V above DGND (standard TTL
logic level). The range of V
ZS
is AGND
≤
V
ZS
≤
(V
CC
–
2.25V).
1.3 UNIPOLAR AND BIPOLAR OUTPUT
VOLTAGE SWING
ML2340 and ML2350 can operate in either unipolar or
bipolar output voltage mode. Unipolar/bipolar mode
selection is determined by comparing the zero scale
voltage (V
ZS
) of these devices to a precise internal
reference that is referred to AGND. V
ZS
is ideally the
voltage that will be produced at the DAC voltage output
when the digital input data is set to all “0’s” Unipolar
mode is selected when V
ZS
is lower than 1.00 volt, and
bipolar mode is selected when V
ZS
is greater than 1.50
volts.
1.3.1 Unipolar Output Mode
In the unipolar mode, V
OUT
swings above V
ZS
. Ideally the
00000000 code results in an output voltage of V
ZS
, and
the 11111111 code results in an output voltage of
V
FS
x 255/256, where V
FS
is the full-scale voltage
determined by V
REF IN
and the gain setting.
1.3.2 Bipolar Output Mode
In the bipolar mode, V
OUT
swings around V
ZS
. The input
data is in 2’s complement binary format. Ideally, the
00000000 code results in an output voltage of V
ZS
; the
10000000 code results in an output voltage of (V
ZS
– V
FS
);
and the 01111111 results in an output voltage of (V
ZS
+
V
FS
127/128), where V
FS
is the full scale output voltage
determined by V
REF IN
and the gain setting.
1.4 OUTPUT BUFFER AND GAIN SETTING
The output buffer converts the D/A output current to a
voltage output using a resistive network with proper gain
setting determined by the GAIN 0 and GAIN 1 inputs.
There are four possible gain settings for unipolar output
voltage mode and bipolar output voltage mode as listed
below:
Unipolar Output Voltage Mode
Voltage Output Swing
Relative to V
ZS
V
REF IN
×
1
/
4
V
REF IN
×
1
/
2
V
REF IN
×
1
V
REF IN
×
2
GAIN 1
GAIN 0
GAIN
0
0
1
/
4
0
1
1
/
2
1
0
1
1
1
2
the D/A converter. The D/A converter output current is
then converted to a voltage output by an output buffer
and a resistive network. The matching among the
on-chip resistors preserves the gain accuracy between
these conversions.
The D/A converter can be used in a multiplying mode by
modulating the reference input within the specified
V
REF IN
range.
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