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MAX5165LCCM
32-Channel Sample/Hold Amplifier with a Single Multiplexed Input
General DescriptionThe MAX5165 contains four 1-to-8 multiplexers and 32
sample/hold amplifiers. A single analog input connects
to all four internal 1-to-8 multiplexers. The sample/hold
amplifiers are organized into four octal sample/holds
with independent TTL/CMOS-compatible track/hold
enables for each octal set. Additional 3-bit TTL/CMOS-
compatible address logic selects the 1-to-8 multiplexer
channel. Clamping diodes on each output allow clamp-
ing between two external reference voltages. The
MAX5165 is available with an output impedance of
50Ω, 500Ω, or 1kΩ, allowing output filtering.
The MAX5165 operates with +10V and -5V supplies and
a separate +5V digital logic supply. Manufactured with
a proprietary BiCMOS process, it provides high accura-
cy, fast acquisition time, low droop rate, and a low hold
step. The device acquires 8V step input signals to
0.01% accuracy in 2.5µs. Transitions from sample
mode to hold mode result in only a 0.5mV error. While
in hold mode, the output voltage slowly droops at a rate
of 1mV/sec. The MAX5165 is available in a 48-pin TQFP
package.
ApplicationsAutomatic Test Equipment (ATE)
Industrial Process Controls
Arbitrary Function Generators
Avionics Equipment
Features32-Channel Sample/HoldOutput Clamping0.01% Accuracy of Acquired Signal0.01% Linearity ErrorFast Acquisition Time: 2.5µsLow Droop Rate: 1mV/secLow Hold Step: 0.25mVWide Output Voltage Range: +7V to -4V
MAX5165
32-Channel Sample/Hold Amplifier
with a Single Multiplexed Input19-1469; Rev 0; 7/99
Pin Configuration
Ordering Information
MAX5165
32-Channel Sample/Hold Amplifier
with a Single Multiplexed Input
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS(VDD= +10V, VSS= -5V, VL = +5V ±5%, AGND = DGND, RL= 5kΩ, CL= 50pF, TA= TMINto TMAX, unless otherwise noted. Typical
values are at TA= +25°C.)
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
VDDto AGND.......................................................-0.3V to +11.0V
VSSto AGND.........................................................-6.0V to +0.3V
VDDto VSS......................................................................+15.75V
VL to DGND...........................................................-0.3V to +6.0V
VL to AGND...........................................................-0.3V to +6.0V
DGND to AGND.....................................................-0.3V to +2.0V
IN to AGND.................................................................VSSto VDD
A_, M_ to DGND....................................................-0.3V to +6.0V
CH, CL to AGND.................................................-6.0V to +11.0V
Maximum Current into Output Pin....................................±10mA
Maximum Current into A_, M_..........................................±20mA
Continuous Power Dissipation (TA= +70°C)
48-pin TQFP (derate 12.5mW/°C above +70°C).........1000mW
Operating Temperature Ranges
MAX5165_CCM...................................................0°C to +70°C
MAX5165_ECM.................................................-40°C to +85°C
Storage Temperature Range.............................-65°C to +150°C
Lead Temperature (soldering, 10sec).............................+300°C
Maximum Current into CH, CL, PIN..................................±80mA
MAX5165
32-Channel Sample/Hold Amplifier
with a Single Multiplexed Input
ELECTRICAL CHARACTERISTICS (continued)(VDD= +10V, VSS= -5V, VL = +5V ±5%, AGND = DGND, RL= 5kΩ, CL= 50pF, TA= TMINto TMAX, unless otherwise noted. Typical
values are at TA= +25°C.)
Note 1:Guaranteed by design.
Note 2:Only one M_ input may be asserted low at a time, so only one channel is selected (see Single vs. Simultaneous Sampling).
Note 3:Do not exceed the absolute maximum rating for VDDto VSSof +15.75V (see Absolute Maximum Ratings).
MAX5165
32-Channel Sample/Hold Amplifier
with a Single Multiplexed Input
Typical Operating Characteristics(VDD= +10V, VSS= -5V, VL= +5V, IN = GND, RL= ∞, CL= 0, AGND = DGND, VCH= VDD, VCL= VSS, TA= +25°C, unless other-
wise noted.)
MAX5165
32-Channel Sample/Hold Amplifier
with a Single Multiplexed InputFigure 1. Functional Diagram
MAX5165
32-Channel Sample/Hold Amplifier
with a Single Multiplexed Input
_______________Detailed DescriptionThe MAX5165 connects a single analog input to the
inputs of four internal 1-to-8 analog multiplexers. Each
multiplexer channel connects to a buffered sample/hold
circuit and a series output resistor, creating a single-
input device with 32 sample/hold output channels.
Three multiplexer channel-address inputs and four
mode-select inputs (one for each multiplexer) control
channel selection and sample/hold functions (Figure 1
and Tables 1, 2).
Digital InterfaceThree address pins and 3-to-8 address decoder logic
select the channel for all four internal analog multiplex-
ers. The mode-select inputs (M3–M0) independently
control the sample/hold functions for each multiplexer
(Tables 1, 2).
Sample/HoldThe MAX5165 contains 32 buffered sample/hold cir-
cuits with internal hold capacitors. Internal hold capaci-
tors minimize leakage current, dielectric absorption,
feedthrough, and required board space. The value of
the hold capacitor affects acquisition time and droop
rate. Lower capacitance allows faster acquisition times
but increases the droop rate. Higher values increase
hold time and acquisition time. The hold capacitor used
in the MAX5165 provides fast 2.5µs (typ) acquisition
time while maintaining a low 1mV/sec (typ) droop rate,
making the sample/hold ideal for high-speed sampling.
Pin Description
