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參數(shù)資料
| 型號： | AD5339 |
| 廠商： | Analog Devices, Inc. |
| 英文描述： | 2.5 V to 5.5 V, 250 UA, 2-Wire Interface Dual-Voltage Output, 8-/10-/12-Bit DACs |
| 中文描述： | 2.5 V至5.5 V，250尿酸，2線接口雙電壓輸出，8-/10-/12-Bit數(shù)模轉(zhuǎn)換器 |
| 文件頁數(shù)： | 15/24頁 |
| 文件大?。?/td> | 654K |
| 代理商： | AD5339 |
AD5337/AD5338/AD5339
FUNCTIONAL DESCRIPTION
The AD5337/AD5338/AD5339 are dual resistor-string DACs
fabricated on a CMOS process with resolutions of 8, 10, and
12 bits, respectively. Each contains two output buffer amplifiers
and is written to via a 2-wire serial interface. The DACs operate
from single supplies of 2.5 V to 5.5 V, and the output buffer
amplifiers provide rail-to-rail output swing with a slew rate of
0.7 V/μs. The two DACs share a single reference input pin.
Each DAC has three programmable power-down modes that
allow the output amplifier to be configured with either a 1 k
load to ground, a 100 k load to ground, or as a high
impedance three-state output.
Rev. A | Page 15 of 24
DIGITAL-TO-ANALOG CONVERTER SECTION
The architecture of one DAC channel consists of a resistor-
string DAC followed by an output buffer amplifier. The voltage
at the REFIN pin provides the reference voltage for the DAC.
Figure 29 shows a block diagram of the DAC architecture.
Because the input coding to the DAC is straight binary, the ideal
output voltage is given by
N
REF
2
OUT
V
D
V
×
=
where:
D
is the decimal equivalent of the binary code, which is loaded
to the DAC register;
0–255 for AD5337 (8 bits)
0–1023 for AD5338 and AD5338-1 (10 bits)
0–4095 for AD5339 (12 bits)
N
is the DAC resolution
INPUT
REGISTER
REFIN
OUTPUT BUFFER
AMPLIFIER
V
OUT
A
RESISTOR
STRING
DAC
REGISTER
0
Figure 29. DAC Channel Architecture
RESISTOR STRING
The resistor string portion is shown in Figure 30. It is simply a
string of resistors, each of value R. The digital code loaded to
the DAC register determines the node at which the voltage is
tapped off and fed into the output amplifier. The voltage is
tapped off by closing one of the switches that connects the
string to the amplifier. Because the DAC comprises a string
of resistors, it is guaranteed to be monotonic.
R
R
R
R
R
TO OUTPUT
AMPLIFIER
0
Figure 30. Resistor String
DAC REFERENCE INPUTS
There is a single reference input pin for the two DACs. The
reference input is unbuffered. The user can have a reference
voltage as low as 0.25 V and as high as V
DD
, since there is no
restriction due to headroom and foot room of any reference
amplifier.
It is recommended to use a buffered reference in the external
circuit, for example, REF192. The input impedance is typically
45 k.
OUTPUT AMPLIFIER
The output buffer amplifier is capable of generating rail-to-rail
voltages on its output, which gives an output range of 0 V to
V
DD
when the reference is V
DD
. The amplifier is capable of
driving a load of 2 k to GND or V
DD
in parallel with 500 pF to
GND or V
DD
. The source and sink capabilities of the output
amplifier can be seen in the plot in Figure 16.
The slew rate is 0.7 V/μs with a half-scale settling time to
±0.5 LSB (at 8 bits) of 6 μs.
POWER-ON RESET
The AD5337/AD5338/AD5339 power on in a defined state via a
power-on reset function. The power-on state is normal
operation, with output voltage set to 0 V.
Both input and DAC registers are filled with zeros until a valid
write sequence is made to the device. This is particularly useful
in applications where it is important to know the state of the
DAC outputs while the device is powering on.
SERIAL INTERFACE
The AD5337/AD5338/AD5339 are controlled via an I
2
C-
compatible serial bus. The DACs are connected to this bus as
slave devices—that is, no clock is generated by the AD5337/
AD5338/AD5339 DACs. This interface is SMBus-compatible at
V
DD
< 3.6 V.
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