AD7537KNZ Analog Devices Inc, AD7537KNZ Datasheet - Page 6

• Manufacturer Part Number: AD7537KNZ
• Description: IC DAC 12BIT DUAL MULT 24DIP
• Manufacturer: Analog Devices Inc

Specifications of AD7537KNZ

• Data Interface: Parallel
• Settling Time: 250µs
• Number Of Bits: 12
• Number Of Converters: 2
• Voltage Supply Source: Single Supply
• Power Dissipation (max): 24mW
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Through Hole
• Package / Case: 24-DIP (0.300", 7.62mm)
• Resolution (bits): 12bit
• Sampling Rate: 667kSPS
• Input Channel Type: Parallel
• Supply Current: 2mA
• Digital Ic Case Style: DIP
• No. Of Pins: 24
• Number Of Channels: 2
• Resolution: 12b
• Conversion Rate: 667KSPS
• Interface Type: Parallel
• Single Supply Voltage (typ): 12/15V
• Dual Supply Voltage (typ): Not RequiredV
• Architecture: R-2R
• Power Supply Requirement: Single
• Output Type: Current
• Integral Nonlinearity Error: ±0.5LSB
• Single Supply Voltage (min): 10.8V
• Single Supply Voltage (max): 16.5V
• Dual Supply Voltage (min): Not RequiredV
• Dual Supply Voltage (max): Not RequiredV
• Operating Temp Range: -40C to 85C
• Operating Temperature Classification: Industrial
• Mounting: Through Hole
• Pin Count: 24
• Package Type: PDIP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant, Lead free / RoHS Compliant

AD7537
SEPARATE AGND PINS
The DACs in the AD7537 have separate AGND lines taken to
pins AGNDA and AGNDB on the package. This increases the
applications versatility of the part. Figure 6 is an example of
this. DAC A is connected in standard fashion as a program-
mable attenuator. AGNDA is at ground potential. DAC B is op-
erating with AGND B biased to +5 V by the AD584. This gives
an output range of +5 V to +10 V.
PROGRAMMABLE OSCILLATOR
Figure 7 shows a conventional state variable oscillator in which
Figure 6. AD7537 DACs Used in Different Modes
Figure 7. Programmable State Variable Oscillator
–6–
the AD7537 controls the programmable integrators. The fre-
quency of oscillation is given by:
where R
DACs. The same digital code is loaded into both DACs.
If C1 = C2 and R5 = R6, the expression reduces to
Since R
where m is the DAC ladder resistance mismatch ratio, typically
1.005.
With the values shown in Figure 7, the output frequency varies
from 0 Hz to 1.38 kHz. The amplitude of the output signal at
the A3 output is 10 V peak-to-peak and is constant over the
entire frequency span.
EQ1
EQ
and R
f
2
f
2
2
n
1
1
2
N
1
2
EQ2
R
1
f
LAD
D
C
C R
are the equivalent resistances of the
C
1
2
R6
R5
1
, (R
R
D
LAD m
LAD1
R
LAD
LAD1
C
C1 C2 R
1
(N / 2
1
= DAC ladder resistance).
R
R
LAD2
EQ1
R
n
)
LAD2
2
1
1
R
EQ1
EQ2
D
R
EQ2
2
N
n
REV. 0