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MX7534BQ Datasheet(PDF) 10 Page - Maxim Integrated Products

Part # MX7534BQ
Description  Microprocessor-Compatible, 14-Bit DACs
Download  16 Pages
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Manufacturer  MAXIM [Maxim Integrated Products]
Direct Link  https://www.maximintegrated.com/en.html
Logo MAXIM - Maxim Integrated Products

MX7534BQ Datasheet(HTML) 10 Page - Maxim Integrated Products

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Microprocessor-Compatible,
14-Bit DACs
10
______________________________________________________________________________________
Compensation
A compensation capacitor, C1, may be needed when
the DAC is used with a high-speed output amplifier.
The capacitor cancels the pole formed by the DAC’s
output capacitance and internal feedback resistance.
Its value depends on the type of op amp used, but typi-
cal values range from 10pF to 33pF. Too small a value
causes output ringing, while excess capacitance over-
damps the output. Minimize C1’s size and improve out-
put settling performance by keeping the PC board
trace as short as possible and stray capacitance at
IOUT as small as possible.
Bypassing
Place a 1µF bypass capacitor, in parallel with a 0.01µF
ceramic capacitor, as close to the DAC’s VDD and GND
pins as possible. Use a 1µF tantalum bypass capacitor
to optimize high-frequency noise rejection. Place a
4.7µF decoupling capacitor at VSS to minimize the DAC
output leakage current.
The MX7534/MX7535 have high-impedance digital
inputs. To minimize noise pickup, connect them to
either VDD or GND terminals when not in use. Connect
active inputs to VDD or GND through high-value resis-
tors (1M
Ω) to prevent static charge accumulation if
these pins are left floating, as might be the case when
a circuit card is left unconnected.
Op-Amp Selection
Input offset voltage (VOS), input bias current (IB), and
offset voltage drift (TC VOS) are three key parameters in
determining the choice of a suitable amplifier. To main-
tain specified accuracy with VREF of 10V, VOS should
be less than 30µV and IB should be less than 2nA.
Open-loop gain should be greater than 340,000.
Maxim’s MAX400 has low VOS (10µV max), low IB
(2nA), and low TC VOS (0.3µV/°C max). This op amp
can be used without requiring any adjustments. For
OP AMP
INPUT OFFSET
VOLTAGE (VOS)
INPUT BIAS
CURRENT (IB)
OFFSET VOLTAGE
DRIFT (TC VOS)
SETTLING
TO 0.003% FS
MAX400
10µV
2nA
0.3µV/°C
50µs
Maxim OP07
25µV
2nA
0.6µV/°C
50µs
AD554L*
500µV
25pA
5µV/°C
5µs
HA2620*
4mV
35nA
20µV/°C
0.8µs
Table 5. Amplifier Performance Comparisons
* AD544L is an Analog Devices part; HA2620 is a Harris Semiconductor part.
R4
33
R3
100
INPUT
DATA
SIGNAL
GROUND
A1
A2
7–14
620
5
4
3
2
19
1
C1
33pF
VDD
VDD
RL
VSS
MX7534
REF
RFB
IOUT
AGNDS
AGNDF
DGND
D7–D0
+
+
VIN
NOTE: CONTROL INPUTS OMITTED FOR CLARITY.
VO
Figure 6a. Unipolar Binary Operation with Forced Ground
R2
10
R1
20
INPUT
DATA
SIGNAL
GROUND
ANALOG
GROUND
A1
A2
8–21
7
27
6
5
4
3
26
21
C1
33pF
VDD
VDD
RL
VSS
MX7535
REFF REFS
RFB
IOUT
AGNDS
AGNDF
DGND
D13–D0
+
+
VOLTAGE
REFERENCE
NOTE: CONTROL INPUTS OMITTED FOR CLARITY.
VO
Figure 6b. Unipolar Binary Operation with Forced Ground for
Remote Load


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