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MAX5304CUA+

P1-P3P4-P6P7-P9P10-P12
MAX5304
10-Bit Voltage-Output DAC
in 8-Pin µMAX
10 ______________________________________________________________________________________
The MAX5304’s total harmonic distortion plus noise
(THD+N) is typically less than -77dB (full-scale code),
given a 1Vp-p signal swing and input frequencies up to
25kHz. The typical -3dB frequency is 650kHz, as
shown in the Typical Operating Characteristics graphs.
Digitally Programmable Current Source
Figure 12’s circuit places an NPN transistor (2N3904 or
similar) within the op amp feedback loop to implement
a digitally programmable, unidirectional current source.
The output current is calculated with the following
equation:
I
OUT
= (V
REF
/ R)(NB / 1024)
where NB is the numeric value of the DAC’s binary
input code, and R is the sense resistor shown in Figure
12.
Note: ( ) are for sub-bits.
MAX5304
DAC
REF
OUT
FB
GND
+5V
V
DD
Figure 8. Unipolar Output Circuit
Table 3. Bipolar Output Codes
MAX5304
DAC
REF
OUT
10k
10k
GND
+5V
V
DD
FB
Figure 9. Unipolar Rail-to-Rail Output Circuit
ANALOG OUTPUT
11 1111 1111 (000)
10 0000 0001 (000)
DAC CONTENTS
MSB LSB
10 0000 0000 (000) 0V
01 1111 1111 (000)
00 0000 0000 (000)
00 0000 0001 (000)
+V
511
512
REF
+V
1
512
REF
-V
1
512
REF
-V
511
512
REF
-V
512
512
-V
REF REF
=
MAX5304
10-Bit Voltage-Output DAC
in 8-Pin µMAX
______________________________________________________________________________________ 11
Power-Supply Considerations
On power-up, the input and DAC registers are cleared
(set to zero code). For rated MAX5304 performance,
REF must be at least 1.4V below V
DD
. Bypass V
DD
with
a 4.7µF capacitor in parallel with a 0.1µF capacitor to
GND. Use short lead lengths, and place the bypass
capacitors as close to the supply pins as possible.
Grounding and Layout Considerations
Digital or AC transient signals on GND can create noise
at the analog output. Connect GND to the highest-qual-
ity ground available. Good PC board ground layout
minimizes crosstalk between the DAC output, reference
input, and digital input. Reduce crosstalk by keeping
analog lines away from digital lines. Wire-wrapped
boards are not recommended.
DAC
V
OUT
V+
V-
+5V
R1 = R2 = 10kΩ ±0.1%
MAX5304
REF
R1
R2
FB
OUT
V
DD
GND
Figure 10. Bipolar Output Circuit
DAC
OUT
MAX5304
10k
26k
REF
V
DD
GND
+5V
+5V
AC
REFERENCE
INPUT
500mVp-p
MAX495
Figure 11. AC Reference Input Circuit
DAC
MAX5304
REF
OUT
R
I
OUT
2N3904
V
L
FB
+5V
V
DD
GND
Figure 12. Digitally Programmable Current Source
___________________Chip Information
TRANSISTOR COUNT: 3053
SUBSTRATE CONNECTED TO AGND
MAX5304
10-Bit Voltage-Output DAC
in 8-Pin µMAX
Package Information
Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are
implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.
12 ____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600
© 1999 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.
8LUMAXD.EPS
P1-P3P4-P6P7-P9P10-P12

MAX5304CUA+

Mfr. #:
Buy MAX5304CUA+
Manufacturer:
Maxim Integrated
Description:
Digital to Analog Converters - DAC 10-Bit Precision DAC
Lifecycle:
New from this manufacturer.
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