參數(shù)資料
型號(hào)： EVAL-AD5755SDZ
廠(chǎng)商： Analog Devices Inc
文件頁(yè)數(shù)： 22/52頁(yè)
文件大?。?/td> 0K
描述： BOARD EVAL FOR AD5755
視頻文件： AD5755: 16-Bit Multi-Channel, Voltage and Current Output DAC
標(biāo)準(zhǔn)包裝： 1
DAC 的數(shù)量： 4
位數(shù)： 16
數(shù)據(jù)接口： 串行
設(shè)置時(shí)間： 11µs
DAC 型： 電流/電壓
工作溫度： -40°C ~ 105°C
已供物品： 板
已用 IC / 零件： AD5755
Data Sheet
AD5755
Rev. C | Page 29 of 52
THEORY OF OPERATION
The AD5755 is a quad, precision digital-to-current loop and
voltage output converter designed to meet the requirements of
industrial process control applications. It provides a high
precision, fully integrated, low cost, single-chip solution for
generating current loop and unipolar/bipolar voltage outputs.
The current ranges available are 0 mA to 20 mA, 0 mA to
24 mA, and 4 mA to 20 mA. The voltage ranges available are
0 V to 5 V, ±5 V, 0 V to 10 V, and ±10 V. The current and
voltage outputs are available on separate pins, and only one is
active at any one time. The desired output configuration is user
selectable via the DAC control register.
On-chip dynamic power control minimizes package power
dissipation in current mode.
DAC ARCHITECTURE
The DAC core architecture of the AD5755 consists of two
matched DAC sections. A simplified circuit diagram is shown
in Figure 70. The four MSBs of the 16-bit data-word are
decoded to drive 15 switches, E1 to E15. Each of these switches
connects one of 15 matched resistors to either ground or the
reference buffer output. The remaining 12 bits of the data-word
drive Switch S0 to Switch S11 of a 12-bit voltage mode R-2R
ladder network.
12-BIT R-2R LADDER
FOUR MSBs DECODED INTO
15 EQUAL SEGMENTS
2R
S0
S1
S11
E1
E2
E15
VOUT
2R
07304-
069
Figure 70. DAC Ladder Structure
The voltage output from the DAC core is either converted to a
current (see Figure 72), which is then mirrored to the supply rail
so that the application simply sees a current source output, or it
is buffered and scaled to output a software selectable unipolar or
bipolar voltage range (see Figure 71). Both the voltage and
current outputs are supplied by VBOOST_x. The current and
voltage are output on separate pins and cannot be output
simultaneously. A channel’s current and voltage output pins can
be tied together.
RANGE
SCALING
DAC
VOUT_X SHORT FAULT
+VSENSE_X
–VSENSE_X
VOUT_X
07304-
070
Figure 71. Voltage Output
16-BIT
DAC
VBOOST_x
R2
T2
T1
R3
IOUT_x
RSET
A1
A2
07304-
071
Figure 72. Voltage-to-Current Conversion Circuitry
Voltage Output Amplifier
The voltage output amplifier is capable of generating both
unipolar and bipolar output voltages. It is capable of driving a
load of 1 k in parallel with 1 F (with an external compen-
sation capacitor) to AGND. The source and sink capabilities of
the output amplifier are shown in Figure 22. The slew rate is
1.9 V/s with a full-scale settling time of 16 s (10 V step). If
remote sensing of the load is not required, connect +VSENSE_x
directly to VOUT_x and connect VSENSE directly to AGND.
+VSENSE_x must stay within ±3.0 V of VOUT_x, and VSENSE_x must
stay within ±3.0 V of AGND for correct operation.
Driving Large Capacitive Loads
The voltage output amplifier is capable of driving capacitive
loads of up to 2 F with the addition of a 220 pF nonpolarized
compensation capacitor on each channel. Care should be taken
to choose an appropriate value of compensation capacitor. This
capacitor, while allowing the AD5755 to drive higher capacitive
loads and reduce overshoot, increases the settling time of the
part and, therefore, affects the bandwidth of the system. With-
out the compensation capacitor, up to 10 nF capacitive loads
can be driven. See Table 5 for information on connecting
compensation capacitors.
Reference Buffers
The AD5755 can operate with either an external or internal
reference. The reference input requires a 5 V reference for
specified performance. This input voltage is then buffered
before it is applied to the DAC.
POWER-ON STATE OF AD5755
On initial power-up of the AD5755, the power-on reset circuit
powers up in a state that is dependent on the power-on
condition (POC) pin.
If POC = 0, the voltage output and current output channels
power up in tristate mode.
If POC = 1, the voltage output channel powers up with a 30 k
pull-down resistor to ground, and the current output channel
powers up to tristate.
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