MAX5166LECM Maxim Integrated, MAX5166LECM Datasheet - Page 8
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MAX5166LECM
Manufacturer Part Number
MAX5166LECM
Description
Sample & Hold Amplifiers
Manufacturer
Maxim Integrated
Series
MAX5166r
Datasheet
1.MAX5166MECM-T.pdf
(12 pages)
Specifications of MAX5166LECM
Number Of Channels
32
Acquisition Time
4 us
Maximum Operating Temperature
+ 85 C
Minimum Operating Temperature
- 40 C
Mounting Style
SMD/SMT
Package / Case
TQFP-48
Minimum Dual Supply Voltage
- 4.75 V, + 9.5 V
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
MAX5166LECM+
Manufacturer:
Maxim Integrated
Quantity:
10 000
Company:
Part Number:
MAX5166LECM+T
Manufacturer:
Maxim Integrated
Quantity:
10 000
32-Channel Sample/Hold Amplifier
with Four Multiplexed Inputs
Figure 2. Timing Performance
The MAX5166 contains a separate input for each 1-to-8
multiplexer. Externally connect the input pins to form
larger multiplexers. When all four inputs are connected
to the same source, the MAX5166 is functionally equiv-
alent to the MAX5165, except the MAX5166 does not
contain output clamping diodes.
The MAX5166 contains four separate 1-to-8 multiplexers
and individual mode selectors for each multiplexer. When
sampling one channel at a time, use an external 2-to-4
decoder (with active-low outputs) to reduce the number
of digital control lines from seven to five (Figure 3).
Individually control the four mode/multiplexer-select
pins to simultaneously sample on four channels, the
same channel for each multiplexer (Figure 4). Each
mode-select pin controls sampling on one of the 1-to-8
multiplexers, while the 3-bit address selects one of the
eight channels on all the multiplexers (Tables 1 and 2).
Setting any combination of the mode-select pin low
enables sampling on the addressed channels for the
selected multiplexers.
8
__________Applications Information
_______________________________________________________________________________________
Single vs. Simultaneous Sampling
ADDRESS
OUTPUT
(A0–A2)
SELECT
MODE
INPUT
Control-Line Reduction
Combining Inputs
t
AQ
t
H
t
PW
Simultaneously sampling two or more channels reduces
offset voltage but increases acquisition time. Multiply
the single-channel acquisition time by the number of
channels sampling.
Figure 5 shows a typical demultiplexer application.
Different digital codes are converted by the digital-to-
analog converter (DAC) and then stored on eight differ-
ent channels, or as many as 32 different channels
when all four inputs are active. The 100mV/sec (max)
droop rate requires refreshing the hold capacitors
every 100ms before the voltage drops by 1/2LSB for an
8-bit DAC with a 5V full-scale voltage.
The MAX5166 does not require a special power-up
sequence to avoid latchup. The device requires three
separate supply voltages for operation; however, when
one or two of the voltages are not available, DC-DC
charge-pump (switched-capacitor) converters provide
a simple, efficient solution. The MAX860 provides volt-
age doubling or inversion, ideal for conversions from
+5V to +10V or from +5V to -5V. The MAX860 also
functions as a voltage divider to provide conversion
from +10V to +5V.
t
DH
t
AP
HOLD STEP
t
DS
Powering the MAX5166
Multiplexed DAC