MAX5420 View Datasheet(PDF) - Maxim Integrated
Part Name
Description
Manufacturer
MAX5420 Datasheet PDF : 9 Pages
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Digitally Programmable Precision
Voltage Divider for PGAs
H
RATIO = 1
R3B
R2B
R1B
RATIO = 8
RATIO = 4
RATIO = 2
W
R3A
R2A
R1A
( ) R_B
RATIO = 1+
R_A
L
Figure 1. Simplified Functional Diagram
+5V
0.1µF
VDD H
RATIO = 1
+5V
VDD
+5V
MATCH_H
MATCH_L
VIN
MAX5421
L
H
MAX4493
VOUT
GND VSS W
Figure 3. Programmable-Gain Amplifier with Op Amp Bias-
Current Matching
+5V
VDD
+5V
VIN
MAX4237
W
H
VOUT
VSS L
MAX5420
GND
R3B
RATIO = 8
R3A
R2B
RATIO = 4
R2A
R1B
RATIO = 2
W
( ) RATIO =
R_B
1+
R_A
R1A
TEKTRONIX P6245
OSCILLOSCOPE FET
PROBE
CL < 1pF
1MΩ
VSS L
0.1µF
-5V
GND
PULSE
GENERATOR
MAX5421
D1 D0
Figure 2. Switching Time Test Circuit
Figure 4. Programmable-Gain Amplifier
Switching Time and Layout Concerns
The switching time of the MAX5420/MAX5421 depends
on the capacitive loading at W. For best performance,
reduce parasitic board capacitance by minimizing the
circuit board trace from W to the op amp inverting input,
and choose an op amp with low input capacitance.
Chip Information
TRANSISTOR COUNT: 118
PROCESS: CMOS
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