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AD5547 Datasheet

  • AD5547

  • Dual Current Output, Parallel Input, 16-/14-Bit Multiplying ...

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AD5547/AD5557
CIRCUIT OPERATION
D/A CONVERTER SECTION
The AD5547/AD5557 are 16-/14-bit, multiplying, current
output, parallel input DACs. The devices operate from a single
2.7 V to 5.5 V supply, and provide both unipolar (0 V to 鈥揤
REF
or 0 V to +V
REF
), and bipolar (鹵V
REF
) output ranges from 鈥?8 V
to +18 V references. In addition to the precision conversion R
FB
commonly found in current output DACs, there are three addi-
tional precision resistors for 4-quadrant bipolar applications.
The AD5547/AD5557 consist of two groups of precision R-2R
ladders, which make up the 12/10 LSBs, respectively. Further-
more, the 4 MSBs are decoded into 15 segments of resistor value
2R. Figure 19 shows the architecture of the 16-bit AD5547. Each
of the 16 segments and the R-2R ladder carries an equally
weighted current of one-sixteenth of full scale. The feedback
resistor R
FB
and 4-quadrant resistor R
OFS
have values of 10 k鈩?
Each 4-quadrant resistor, R1 and R2, equals 5 k鈩? In 4-quadrant
operation, R1, R2, and an external op amp work together to
invert the reference voltage and apply it to the VREF input.
With R
OFS
and R
FB
connected as shown in Figure 2, the output
can swing from 鈥揤
REF
to +V
REF
.
The reference voltage inputs exhibit a constant input resistance
of 5 k鈩?鹵 20%. The impedance of I
OUT
, the DAC output, is code
dependent. External amplifier choice should take into account
V
REF
R2
5k鈩?/div>
RCOM
R1
5k鈩?/div>
R1
R
40k鈩?/div>
2R
80k鈩?/div>
R
40k鈩?/div>
2R
80k鈩?/div>
R
40k鈩?/div>
2R
80k鈩?/div>
R
40k鈩?/div>
2R
80k鈩?/div>
R
40k鈩?/div>
2R
80k鈩?/div>
R
40k鈩?/div>
2R
80k鈩?/div>
R
40k鈩?/div>
2R
80k鈩?/div>
R
40k鈩?/div>
2R
80k鈩?/div>
2R
80k鈩?/div>
8-BIT R2R
4 MSB
15 SEGMENTS
the variation of the AD5547/AD5557 output impedance. The
feedback resistance in parallel with the DAC ladder resistance
dominates output voltage noise. To maintain good analog
performance, it is recommended that the power supply is
bypassed with a 0.01 碌F to 0.1 碌F ceramic or chip capacitor in
parallel with a 1 碌F tantalum capacitor. Also, to minimize gain
error, PCB metal traces between V
REF
and R
FB
should match.
Every code change of the DAC corresponds to a step function;
gain peaking at each output step may occur if the op amp has
limited GBP and excessive parasitic capacitance present at the
op amp鈥檚 inverting node. A compensation capacitor, therefore,
may be needed between the I-V op amp inverting and output
nodes to smooth the step transition. Such a compensation
capacitor should be found empirically, but a 20 pF capacitor is
generally adequate for the compensation.
The V
DD
power is used primarily by the internal logic to drive
the DAC switches. Note that the output precision degrades if the
operating voltage falls below the specified voltage. Users should
also avoid using switching regulators because device power
supply rejection degrades at higher frequencies.
2R
80k鈩?/div>
2R
80k鈩?/div>
2R
80k鈩?/div>
2R
80k鈩?/div>
ROFS
RA
RB
R
2R
80k鈩?/div>
R
2R
80k鈩?/div>
R
2R
80k鈩?/div>
R
2R
80k鈩?/div>
2R
80k鈩?/div>
4-BIT R2R
IOUT
AGND
15
8
4
ADDRESS DECODER
10k鈩?/div>
RFB
10k鈩?/div>
LDAC
LDAC
DAC REGISTER
RS
RS
WR
WR
INPUT REGISTER
RS
04452-0-011
D15 D14
D0
Figure 19. 16-Bit AD5547 Equivalent R-2R DAC Circuit with Digital Section, One Channel Shown
Rev. 0 | Page 12 of 20

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