19-1674; Rev 0; 4/00
32-Channel Sample/Hold Amplifier
with a Single Multiplexed Input
General Description
The MAX5168 contains 32 sample/hold amplifiers and
four 1-of-8 multiplexers. The logic controlling the muxes
and sample/hold amplifiers combines the four muxes into
a unified 1-of-32 multiplexer with a sample/hold at each
output. Additional logic allows two devices to function as
a single 64-channel unit. The MAX5168 is available with
an output impedance of 50Ω, 500Ω, or 1kΩ.
The MAX5168 operates with +10V and -5V supplies, and
a separate +5V digital logic supply. Manufactured with a
proprietary BiCMOS process, it provides high accuracy,
fast acquisition time, a low droop rate, and a low hold
step. The MAX5168 has a typical linearity error of less
than 0.01% and can accurately acquire 8V step input sig-
nals to 0.01% accuracy in 2.5µs within the +7V to -4V
input signal range. 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/s.
The MAX5168 is available in a 48-pin TQFP package and
is specified for both the commercial (0°C to +70°C) and
extended industrial (-40°C to +85°C) temperature ranges.
o
32-Channel Sample/Hold
o
0.01% Accuracy of Acquired Signal
o
0.01% Linearity Error
o
Fast Acquisition Time: 2.5µs
o
Low Droop Rate: 1mV/s
o
Low Hold Step: 0.25mV
o
Wide Output Voltage Range: +7V to -4V
Features
MAX5168
Ordering Information
PART
MAX5168LCCM
MAX5168MCCM
MAX5168NCCM
MAX5168LECM
MAX5168MECM
MAX5168NECM
TEMP. RANGE
0°C to +70°C
0°C to +70°C
0°C to +70°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
PIN-
PACKAGE
48 TQFP
48 TQFP
48 TQFP
48 TQFP
48 TQFP
48 TQFP
R
OUT
(Ω)
50
500
1k
50
500
1k
________________________Applications
Automatic Test Systems (ATE)
Industrial Process Controls
Arbitrary Function Generators
Avionics Equipment
ADDR2
ADDR3
ADDR4
SELECT
S/H
CONFIG
V
L
DGND
V
SS
AGND
IN
N.C.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
Pin Configuration
TOP VIEW
ADDR1
ADDR0
48
47
46
45
44
43
42
41
40
39
38
37
OUT31
OUT30
OUT29
OUT28
OUT27
OUT26
OUT25
OUT24
OUT23
OUT22
36
35
34
33
32
31
30
29
28
27
26
25
18
19
20
21
22
23
24
OUT21
OUT20
OUT19
OUT18
OUT17
OUT16
V
DD
OUT15
OUT14
OUT13
OUT12
OUT11
MAX5168
________________________________________________________________
Maxim Integrated Products
N.C.
OUT0
OUT1
OUT2
OUT3
OUT4
OUT5
OUT6
OUT7
OUT8
OUT9
OUT10
TQFP
1
For free samples and the latest literature, visit www.maxim-ic.com or phone 1-800-998-8800.
For small orders, phone 1-800-835-8769.
32-Channel Sample/Hold Amplifier
with a Single Multiplexed Input
MAX5168
ABSOLUTE MAXIMUM RATINGS
V
DD
to AGND.......................................................-0.3V to +11.0V
V
SS
to AGND .........................................................-6.0V to +0.3V
V
DD
to V
SS
......................................................................+15.75V
V
L
to DGND ...........................................................-0.3V to +6.0V
V
L
to AGND ...........................................................-0.3V to +6.0V
DGND to AGND.....................................................-0.3V to +2.0V
IN, OUT_ .....................................................................V
SS
to V
DD
Logic Inputs to DGND ...........................................-0.3V to +6.0V
Maximum Current into OUT_ ............................................±10mA
Maximum Current into Logic Inputs .................................±20mA
Continuous Power Dissipation (T
A
= +70°C)
48-Pin TQFP (derate 12.5mW/°C above +70°C)......1000mW
Operating Temperature Ranges
MAX5168_CCM ................................................0°C to +70°C
MAX5168_ECM..............................................-40°C to +85°C
Storage Temperature Range .............................-65°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°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.
ELECTRICAL CHARACTERISTICS
(V
DD
= +10.0V, V
SS
= -5.0V, V
L
= +5.0V ±5%, AGND = DGND = 0, R
L
= 5kΩ, C
L
= 50pF, T
A
= T
MIN
to T
MAX
, unless otherwise noted.
Typical values are at T
A
= +25°C.)
PARAMETER
ANALOG SECTION
Linearity Error
Hold Step
Droop Rate
Offset Voltage
Output Voltage Range
V
OS
V
OUT_
V
HS
-4.0V < V
IN
< +7V, R
L
=
∞
IN = AGND
IN = AGND, T
A
= +25°C
IN = AGND, T
A
= +25°C
+15°C
≤
T
A
≤
+65°C (Note 1)
R
L
=
∞
C
L
= 250pF for
MAX5168L
C
L
= 10nF for
MAX5168M/N
MAX5168L
MAX5168M
MAX5168N
V
SS
+
0.75
-72
-72
-76
dB
-76
10
35
350
700
2
2
V
SS
T
A
= +25°C,
R
L
=
∞,
Figure 2
Figure 2 (Note 1)
8V step to 0.08%
100mV step to ±1mV
2.5
1
1
2
200
V
DD
4
50
500
1000
20
65
650
1300
mA
mA
V
Ω
pF
-30
0.01
0.25
1
-5
20
0.08
1.00
40
+30
40
V
DD
-
2.4
%
mV
mV/s
mV
µV/°C
V
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
Analog Crosstalk
8V step with 500ns
rising edge (Note 1)
C
IN
R
OUT_
I
SOURCE
I
SINK
V
CH
(Note 1)
R
L
=
∞,
C
L
= 250pF
V
IN
= 0, sample mode
V
IN
= 0, sample mode
Input Capacitance
DC Output Impedance
Output Source Current
Output Sink Current
Output Clamp High
TIMING PERFORMANCE
Acquisition Time
Hold-Mode Settling Time
Aperture Delay
t
AQ
t
H
t
AP
µs
µs
ns
To ±1mV of final value, Figure 2 (Note 1)
2
_______________________________________________________________________________________
32-Channel Sample/Hold Amplifier
with a Single Multiplexed Input
ELECTRICAL CHARACTERISTICS (continued)
(V
DD
= +10.0V, V
SS
= -5.0V, V
L
= +5.0V ±5%, AGND = DGND = 0, R
L
= 5kΩ, C
L
= 50pF, T
A
= T
MIN
to T
MAX
, unless otherwise noted.
Typical values are at T
A
= +25°C.)
PARAMETER
S/H
Pulse Width
Data Setup Time
Data Hold Time
DIGITAL INPUTS
Input Voltage High
Input Voltage Low
Input Current
POWER SUPPLIES
Positive Analog Supply
Negative Analog Supply
Digital Logic Supply
Positive Analog Supply Current
Negative Analog Supply Current
V
DD
V
SS
V
L
I
DD
I
SS
R
L
=
∞
R
L
=
∞
ADDR_ = DGND or V
L,
S/H
= DGND or V
L
ADDR_ = 0.8V or 2.0V,
S/H
= 0.8V or 2.0V
For V
DD
and V
SS
, sample mode,
IN = AGND
-60
-75
(Note 2)
(Note 2)
9.5
-4.75
4.75
10
-5
5
10.5
-5.45
5.25
36
36
0.5
5
V
V
V
mA
mA
mA
mA
dB
V
IH
V
IL
I
I
IN = DGND or V
CC
-1
2.0
0.8
+1
V
V
µA
SYMBOL
t
PW
t
SET
t
DH
CONDITIONS
Figure 2 (Note 1)
Figure 2 (Note 1)
Figure 2 (Note 1)
MIN
200
50
150
TYP
MAX
UNITS
ns
ns
ns
MAX5168
Digital Logic Supply Current
I
L
Power-Supply Rejection Ratio
PSRR
Note 1:
Guaranteed by design.
Note 2:
Do not exceed the absolute maximum rating for V
DD
to V
SS
of +15.75V (see
Absolute Maximum Ratings).
_______________________________________________________________________________________
3
32-Channel Sample/Hold Amplifier
with a Single Multiplexed Input
MAX5168
Typical Operating Characteristics
(V
DD
= +10V, V
SS
= -5V, V
L
= +5V, V
IN
= +5V, R
L
=
∞,
C
L
= 0, AGND = DGND = 0, V
CH
= V
DD
, V
CL
= V
SS
, T
A
= +25°C, unless
otherwise noted.)
DROOP RATE vs. INPUT VOLTAGE
MAX5168 TOC 01
DROOP RATE vs. TEMPERATURE
MAX5168 TOC 02
POWER-SUPPLY REJECTION RATIO
SAMPLE MODE
NEGATIVE SUPPLY (V
SS
)
-100
POSITIVE SUPPLY (V
DD
)
-80
PSRR (dB)
MAX5168 TOC 03
2.0
1.8
1.6
DROOP RATE (mV/s)
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0
-4 -3 -2 -1
0
1
2
3
4
5
6
7
INPUT VOLTAGE (V)
50
-120
40
DROOP RATE (mV/s)
30
-60
-40
20
10
-20
0
-40
-15
10
35
60
85
0.1
1
10
100
1000
10,000
TEMPERATURE (°C)
FREQUENCY (kHz)
0
POWER-SUPPLY REJECTION RATIO
HOLD MODE
POSITIVE SUPPLY (V
DD
)
-100
-80
PSRR (dB)
NEGATIVE SUPPLY (V
SS
)
-60
-40
-20
0
0.1
1
10
100
1000
10,000
FREQUENCY (kHz)
MAX5168 TOC 04
HOLD STEP vs. INPUT VOLTAGE
MAX5168 TOC 05
HOLD STEP vs. TEMPERATURE
115
110
HOLD STEP (µV)
105
100
95
90
85
80
MAX5168 TOC 06
-120
-160
-140
-120
HOLD STEP (µV)
-100
-80
-60
-40
-20
0
-4 -3 -2 -1
0
1
2
3
4
5
6
7
INPUT VOLTAGE (V)
120
-55
-35
-15
5
25
45
65
85
TEMPERATURE (°C)
OFFSET VOLTAGE vs. INPUT VOLTAGE
MAX5168 TOC 07
OFFSET VOLTAGE vs. TEMPERATURE
MAX5168 TOC 08
-3.0
-3.2
-3.4
OFFSET VOLTAGE (mV)
-3.6
-3.8
-4.0
-4.2
-4.4
-4.6
-4.8
-5.0
-4 -3 -2 -1
0
1
2
3
4
5
6
7
INPUT VOLTAGE (V)
0
-1
OFFSET VOLTAGE (mV)
-2
-3
-4
-5
-6
-7
-40
-15
10
35
60
85
TEMPERATURE (°C)
4
_______________________________________________________________________________________
32-Channel Sample/Hold Amplifier
with a Single Multiplexed Input
Pin Description
PIN
1
2
3
4
5
6
7
8
9
10
11
12, 13
14–29
30
31–46
47
48
NAME
ADDR2
ADDR3
ADDR4
SELECT
S/H
CONFIG
V
L
DGND
V
SS
AGND
IN
N.C.
OUT0–OUT15
V
DD
OUT16–OUT31
ADDR0
ADDR1
Bit 2 of the Address Decoder
Bit 3 of the Address Decoder
Bit 4 of the Address Decoder
Enables the
S/H
pin. The polarity of SELECT is determined by the state of the CONFIG pin. If CONFIG
is low, then SELECT is active-high. If CONFIG is high, then SELECT is active-low. When SELECT is not
in its active state, all 32 channels are in hold mode independent of the
S/H
pin.
Puts the selected channel into sample mode when low. Places all channels into hold mode when high.
Sets the polarity of the SELECT pin.
+5V Logic Supply
Digital GND
-5V Analog Supply
Analog GND
Input Pin
No connection. Not internally connected.
Outputs 0–15 Pins
+10V Analog Supply
Outputs 16–31 Pins
Bit 0 of the Address Decoder
Bit 1 of the Address Decoder
FUNCTION
MAX5168
_______________________________________________________________________________________
5
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