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AD7541KN Datasheet(PDF) 5 Page - Intersil Corporation

Part # AD7541KN
Description  12-Bit, Multiplying D/A Converter
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Manufacturer  INTERSIL [Intersil Corporation]
Direct Link  http://www.intersil.com/cda/home
Logo INTERSIL - Intersil Corporation

AD7541KN Datasheet(HTML) 5 Page - Intersil Corporation

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10-13
A “Logic 1” input at any digital input forces the corresponding
ladder switch to steer the bit current to IOUT1 bus. A “Logic
0” input forces the bit current to IOUT2 bus. For any code the
IOUT1 and IOUT2 bus currents are complements of one
another. The current amplifier at IOUT2 changes the polarity
of IOUT2 current and the transconductance amplifier at
IOUT1 output sums the two currents. This configuration dou-
bles the output range of the DAC. The difference current
resulting at zero offset binary code, (MSB = “Logic 1”, All
other bits = “Logic 0”), is corrected by using an external
resistive divider, from VREF to IOUT2.
Offset Adjustment
1. Adjust VREF to approximately +10V.
2. Set R4 to zero.
3. Connect all digital inputs to “Logic 1”.
4. Adjust IOUT1 amplifier offset zero adjust trimpot for 0V
±0.1mV at IOUT2 amplifier output.
5. Connect a short circuit across R2.
6. Connect all digital inputs to “Logic 0”.
7. Adjust IOUT2 amplifier offset zero adjust trimpot for 0V
±0.1mV at IOUT1 amplifier output.
8. Remove short circuit across R2.
9. Connect MSB (Bit 1) to “Logic 1” and all other bits to “Logic 0”.
10. Adjust R4 for 0V
±0.2mV at VOUT.
Gain Adjustment
1. Connect all digital inputs to VDD.
2. Monitor VOUT for a -VREF (1 -
1/
2
11) volts reading.
3. To increase VOUT, connect a series resistor, (0Ω to
250
Ω), in the IOUT1 amplifier feedback loop.
4. To decrease VOUT, connect a series resistor, (0Ω to 250Ω),
between the reference voltage and the VREF terminal.
TABLE 2. CODE TABLE - BIPOLAR (OFFSET BINARY)
OPERATION
DIGITAL INPUT
ANALOG OUTPUT
111111111111
-VREF (1 -
1/
2
11)
100000000001
-VREF (
1/
2
11)
100000000000
0
011111111111
VREF (
1/
2
11)
000000000001
VREF (1 -
1/
2
11)
000000000000
VREF
IOUT2
6
6
IOUT1
17
18
1
4
15
3
2
AD7541
BIT 1 (MSB)
BIT 12 (LSB)
16
+15V
VREF
DIGITAL
INPUT
±10V
R1 10K
R5 10K
VOUT
-
+
A1
-
+
A2
GND
R2 10K
R3
390K
R4
500
NOTE: R1 and R2 should be 0.01%, low-TCR resistors.
FIGURE 3. BIPOLAR OPERATION (4-QUADRANT MULTIPLICATION)
AD7541


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