MAX901A [MAXIM]
High-Speed, Low-Power Voltage Comparators; 高速，低功耗电压比较器
| 型号： | MAX901A |
| 厂家： | 
MAXIM INTEGRATED PRODUCTS |
| 描述： | High-Speed, Low-Power Voltage Comparators |
| 文件： | 总12页 (文件大小：159K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
19-2887; Rev. 4; 7/01
High-Speed, Low-Power Voltage Comparators
General Description
Features
ꢀ 8ns (typ) Propagation Delay
The MAX900–MAX903 high-speed, low-power, single/
dual/quad voltage comparators feature differential ana-
log inputs and TTL-logic outputs with active internal pull-
ups. Fast propagation delay (8ns typ at 5mV overdrive)
makes the MAX900–MAX903 ideal for fast A/D convert-
ers and sampling circuits, line receivers, V/F converters,
and many other data-discrimination applications.
ꢀ 18mW/Comparator Power Consumption (+5V, typ)
ꢀ Separate Analog and Digital Supplies
ꢀ Flexible Analog Supply: +5V to +10V or 5V
ꢀ Input Range Includes Negative Supply Rail
ꢀ TTL-Compatible Outputs
All comparators can be powered from separate analog
and digital power supplies or from a single combined sup-
ply voltage. The analog input common-mode range
includes the negative rail, allowing ground sensing when
powered from a single supply. The MAX900–MAX903
consume 18mW per comparator when powered from +5V.
ꢀ TTL-Compatible Latch Inputs (Except MAX901)
Ordering Information
PART
TEMP RANGE
0°C to +70°C
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
-40°C to +85°C
0°C to +70°C
0°C to +70°C
PIN-PACKAGE
20 Plastic DIP
20 Plastic DIP
20 Wide SO
The MAX900–MAX903 are equipped with independent
TTL-compatible latch inputs. The comparator output
states are held when the latch inputs are driven low. The
MAX901 provides the same performance as the
MAX900/MAX902/MAX903 with the exception of the
latches.
MAX900ACPP
MAX900BCPP
MAX900ACWP
MAX900BCWP
MAX900AEPP
MAX900BEPP
MAX900AEWP
MAX900BEWP
MAX901ACPE
MAX901BCPE
20 Wide SO
For newer, pin-for-pin compatible parts with the same
speed and only half the power dissipation, see the
MAX9201/MAX9202/MAX9203 data sheet.
20 Plastic DIP
20 Plastic DIP
20 Wide SO
Applications
High-Speed A/D
Converters
Input Trigger Circuitry
20 Wide SO
High-Speed Data
Sampling
High-Speed V/F
Converters
16 Plastic DIP
16 Plastic DIP
PWM Circuits
Line Receivers
Ordering Information continued at end of data sheet.
Threshold Detectors
Pin Configurations
TOP VIEW
MAX902
MAX903
MAX901
IN- (A)
1
2
3
4
5
6
7
14 V **
CC
IN- (A)
IN+ (A)
GND
1
2
3
4
5
6
7
8
16 IN- (D)
V
**
1
2
3
4
8
7
6
5
V ***
DD
CC
IN+ (A)
GND
13 N.C.
15 IN+ (D)
14 **
IN+
IN-
OUT
12 OUT (B)
11 LATCH (B)
V
CC
GND
B
A
B
D
C
LATCH (A)
OUT (A)
N.C.
OUT (A)
OUT (B)
13 OUT (D)
12 OUT (C)
A
V
*
LATCH
EE
10
9
V ***
DD
IN+ (B)
IN- (B)
V
*
11
10 IN+ (C)
IN- (C)
V
**
EE
DD
DIP/SO
V
EE
*
8
IN+ (B)
IN- (B)
9
*ANALOG V- AND SUBSTRATE
**ANALOG V+
***DIGITAL V+
DIP/SO
DIP/SO
Pin Configurations continued at end of data sheet.
________________________________________________________________ Maxim Integrated Products
1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
High-Speed, Low-Power Voltage Comparators
ABSOLUTE MAXIMUM RATINGS
Analog Supply Voltage (V
to V ) ...................................+12V
Internal Power Dissipation................................................500mW
Derate above +100°C................................................10mW/°C
Operating Temperature Ranges:
MAX900–MAX903_C_ _.......................................0°C to +70°C
MAX900–MAX903_E_ _ ....................................-40°C to +85°C
Junction Temperature........................................-65°C to +160°C
Storage Temperature Range.............................-65°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°C
CC
EE
Digital Supply Voltage (V
to GND) ....................................+7V
DD
Differential Input Voltage..................(V - 0.2V) to (V
+ 0.2V)
+ 0.2V)
EE
CC
CC
Common-Mode Input Voltage..........(V - 0.2V) to (V
EE
Latch-Input Voltage (MAX900/MAX902/
MAX903 only) .........................................-0.2V to (V
Output Short-Circuit Duration
+ 0.2V)
DD
To GND.......................................................................Indefinite
To V ...............................................................................1min
DD
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
= +5V, V = -5V, V
EE
= +5V, LE1–LE4 = logic high, T = +25°C, unless otherwise noted.)
CC
DD
A
MAX900B/MAX901B/
MAX902/MAX903
MAX900A/MAX901A
PARAMETER
SYMBOL
CONDITIONS
UNITS
MIN
TYP
0.5
3
MAX
2.0
6
MIN
TYP
1.0
4
MAX
V
V
= 0
= 1.4V
CM
Input Offset Voltage
Input Bias Current
Input Offset Current
V
4.0
10
mV
µA
nA
OS
O
I
I + or I -
IN IN
B
V
V
= 0;
= 1.4V
CM
I
50
250
100
500
OS
O
V
2.25
-
V
2.25
-
CC
CC
Input Voltage Range
V
(Note 1)
-5V < V
V
- 0.1
V - 0.1
EE
V
CM
EE
<
CM
Common-Mode Rejection
Ratio
+2.75V,
= 1.4V
(Note 2)
CMRR
PSRR
50
150
75
250
µV/V
V
O
Power-Supply Rejection
Ratio
(Note 2)
50
3.5
0.3
1.4
1.4
1
150
100
3.5
0.3
1.4
1.4
1
250
µV/V
V
V
> 250mV,
IN
Output High Voltage
V
2.4
0.8
2.4
OH
I
= 1mA
SRC
V
> 250mV,
IN
Output Low Voltage
V
0.4
2.0
0.4
2.0
V
OL
LH
I
= 8mA
SINK
Latch-Input Voltage High
Latch-Input Voltage Low
Latch-Input Current High
Latch-Input Current Low
V
(Note 3)
(Note 3)
V
V
0.8
V
LL
V
= 3.0V
LH
I
LH
20
20
20
20
µA
µA
(Note 3)
V
= 0.3V
LL
I
1
1
LL
(Note 3)
2
_______________________________________________________________________________________
High-Speed, Low-Power Voltage Comparators
ELECTRICAL CHARACTERISTICS (continued)
(V
= +5V, V = -5V, V
= +5V, LE1–LE4 = logic high, T = +25°C, unless otherwise noted.)
CC
EE
DD
A
MAX900A/MAX901A
MAX902
MAX903
TYP
PARAMETER
SYMBOL
CONDITIONS
MAX900B/MAX901B
UNITS
MIN
TYP
MAX
MIN
TYP
MAX MIN
MAX
Positive Analog
Supply Current
I
(Note 7)
10
15
12
5
8
2.5
4
mA
CC
Negative Analog
Supply Current
I
(Note 7)
(Note 7)
7
3.5
6
2
3
mA
EE
Digital Supply
Current
I
4
6
2
3
1
1.5
28
mA
DD
Power
Dissipation
V
= V
=
DD
CC
PD
70
105
35
55
18
mW
+5V, V = 0
EE
TIMING CHARACTERISTICS
(V
= +5V, V = -5V, V
= +5V, LE1–LE4 = logic high, T = +25°C, unless otherwise noted.)
CC
EE
DD
A
MAX900A/MAX901A
MAX902
MAX903
MAX900B/MAX901B
PARAMETER
SYMBOL
CONDITIONS
UNITS
MIN
TYP
MAX
MIN
TYP MAX MIN
TYP MAX
V
= 5mV,
OD
C = 15pF,
Input-to-Output High
Response Time
L
t
8
10
8
8
10
8
8
10
ns
ns
pd+
I
= 2mA
O
(Note 4)
V
= 5mV,
OD
C = 15pF,
Input-to-Output Low
Response Time
L
t
-
8
10
10
10
pd
I
= 2mA
O
(Note 4)
Difference in
Response Time
Between Outputs
∆t
(Notes 4, 5)
0.5
10
2.0
0.5
10
2.0
0.5
10
2.0
ns
ns
pd
Latch Disable to
Output High Delay
t
(Notes 3, 6)
(Notes 3, 6)
pd+ (D)
Latch Disable to
Output Low Delay
t
12
12
12
ns
pd- (D)
Minimum Setup Time
Minimum Hold Time
t
t
(Notes 3, 6)
(Notes 3, 6)
2
1
2
1
2
1
ns
ns
s
h
Minimum Latch
Disable Pulse Width
t
(Notes 3, 6)
10
10
10
ns
pw (D)
_______________________________________________________________________________________
3
High-Speed, Low-Power Voltage Comparators
ELECTRICAL CHARACTERISTICS
(V
= +5V, V = -5V, V
EE
= +5V, LE1–LE4 = logic high, T = full operating temperature, unless otherwise noted.)
CC
DD
A
MAX900B/MAX901B/
MAX900A/MAX901A
MAX902/MAX903
PARAMETER
SYMBOL
CONDITIONS
UNITS
MIN
TYP
MAX
MIN
TYP
MAX
V
V
= 0,
= 1.4V
CM
Input Offset Voltage
Input Bias Current
Input Offset Current
Input Voltage Range
V
1
3
2
6
mV
µA
nA
V
OS
O
I
I
or I
IN-
4
10
6
15
B
IN+
V
V
= 0,
= 1.4V
CM
I
100
500
200
800
OS
O
V
0.1
-
V
-
V
0.1
-
V
-
CC
2.25
EE
CC
2.25
EE
V
(Note 1)
-5V < V
CM
<
CM
+2.75V,
= 1.4V
(Note 2)
Common-Mode
Rejection Ratio
CMRR
PSRR
80
250
120
500
µV/V
V
O
Power-Supply
Rejection Ratio
(Note 2)
100
3.5
0.3
1.4
1.4
2
250
150
3.5
0.3
1.4
1.4
1
500
µV/V
V
V
> 250mV,
IN
Output High Voltage
Output Low Voltage
V
2.4
0.8
2.4
0.8
OH
I
= 1mA
SRC
V
> 250mV,
IN
V
V
0.4
2.0
0.4
2.0
V
OL
LH
I
= 8mA
SINK
Latch Input Voltage
High
(Note 7)
(Note 7)
V
Latch Input Voltage
Low
V
V
LL
Latch Input Current
High
V
= 3.0V
LH
I
20
20
20
20
µA
µA
LH
(Note 7)
V = 0.3V
LL
Latch Input Current
Low
I
2
1
LL
(Note 7)
4
_______________________________________________________________________________________
High-Speed, Low-Power Voltage Comparators
ELECTRICAL CHARACTERISTICS (continued)
(V
= +5V, V = -5V, V
= +5V, LE1–LE4 = logic high, T = full operating temperature, unless otherwise noted.)
CC
EE
DD
A
MAX900A/MAX901A/
MAX900B/MAX901B
MAX902
MAX903
TYP
PARAMETER
SYMBOL
CONDITIONS
UNITS
MIN
TYP
MAX
MIN
TYP
MAX
MIN
MAX
Positive Analog
Supply Current
I
(Note 7)
(Note 7)
(Note 7)
10
25
5
12
2.5
6
mA
mA
mA
mW
CC
Negative Analog
Supply Current
I
7
4
20
10
3.5
2
10
5
2
1
5
EE
Digital Supply
Current
I
2.5
28
DD
Power
Dissipation
V
= V
=
DD
CC
P
70
105
35
55
18
D
+5V, V = 0
EE
TIMING CHARACTERISTICS
(V
= +5V, V = -5V, V
EE
= +5V, LE1–LE4 = logic high, T = full operating temperature, unless otherwise noted.)
CC
DD
A
MAX900B/MAX901B/
MAX900A/MAX901A
PARAMETER
SYMBOL
CONDITIONS
MAX902/MAX903
UNITS
MIN
TYP
MAX
MIN
TYP
MAX
V
= 5mV,
OD
Input-to-Output High
Response Time
C = 15pF,
L
t
10
15
10
15
ns
pd+
I
= 2mA
O
(Note 4)
V
= 5mV,
OD
Input-to-Output Low
Response Time
C = 15pF,
L
t
10
1
15
3
10
1
15
3
ns
ns
pd-
I
= 2mA
O
(Note 4)
Difference in Response
Time Between Outputs
∆t
(Notes 4, 5)
pd
Note 1: The input common-mode voltage and input signal voltages should not be allowed to go negative by more than 0.2V below
V
EE
. The upper-end of the common-mode voltage range is typically V
- 2V, but either or both inputs can go to a maximum
CC
of V
+ 0.2V without damage.
CC
Note 2: Tested for +4.75V < V
< +5.25V, and -5.25V < V < -4.75V with V
= +5V, although permissible analog power-supply
CC
EE
DD
range is +4.75V < V
< +10.5V for single-supply operation with V grounded.
CC
EE
Note 3: Specification does not apply to MAX901.
Note 4: Guaranteed by design. Times are for 100mV step inputs (see Propagation Delay Characteristics in Figures 2 and 3).
Note 5: Maximum difference in propagation delay between any of the four comparators in the MAX900–MAX903.
Note 6: See Timing Diagram (Figure 2). Owing to the difficult and critical nature of switching measurements involving the latch,
these parameters cannot be tested in a production environment. Typical specifications listed are taken from measurements
using a high-speed test-jig.
Note 7: I
tested for +4.75V < V
< +10.5V with V grounded. I tested for -5.25V < V < -4.75V with V
= +5V. I
tested
CC
CC
EE
EE
EE
CC
DD
for +4.75V < V
< +5.25V with the worst-case condition of all four comparator outputs at logic low.
DD
_______________________________________________________________________________________
5
High-Speed, Low-Power Voltage Comparators
Typical Operating Characteristics
(T = +25°C, unless otherwise noted.)
A
INPUT OFFSET VOLTAGE
vs. TEMPERATURE
INPUT BIAS CURRENT
vs. TEMPERATURE
OUTPUT LOW VOLTAGE
(V ) vs. LOAD CURRENT
OL
2
1
4.0
3.5
3.0
2.5
2.0
0.5
0.4
0.3
0.2
0.1
T
A
= -55°C
0
-1
-2
T
A
= +25°C
T
A
= +125°C
-40 -20
0
20 40 60 80 100 120
-40 -20
0
20 40 60 80 100 120
2
4
6
8
10
TEMPERATURE (°C)
TEMPERATURE (°C)
LOAD CURRENT (mA)
I
SUPPLY CURRENT (PER COMPARATOR)
IINPUT OVERDRIVE vs.
INPUT OVERDRIVE vs.
CC
vs. V SUPPLY VOLTAGE
t
RESPONSE TIME
t
RESPONSE TIME
CC
pd+
pd-
V
= +5V
DD
3.0
2.8
2.6
2.4
2.2
2.0
1.8
1.6
4
3
4
3
T
A
= +125°C
2mV
25mV
2mV
25mV
5mV
T
A
= +25°C
2
2
1
1
5mV
0
0
T
A
= -55°C
100
0
100
0
INPUT OVERDRIVE (V
)
OD
INPUT OVERDRIVE (V
)
OD
-100
-100
4
5
6
7
8
9
10
0
2
4
6
8
10 12 14
0
2
4
6
8
10 12 14
V
CC
SUPPLY VOLTAGE (V)
tpd+ RESPONSE TIME (ns)
tpd- RESPONSE TIME (ns)
RESPONSE TIME vs.
TEMPERATURE (5mV OVERDRIVE)
RESPONSE TIME vs. LOAD CAPACITANCE
(5mV OVERDRIVE)
14
13
12
11
10
9
R = 2.4kΩ
L
14
13
12
11
10
9
t
pd+
t
pd-
t
pd+
8
8
7
t
pd-
6
7
5
-40 -20
0
20 40 60 80 100 120
10 20 30 40 50 60 70 80
LOAD CAPACITANCE (pF)
TEMPERATURE (°C)
6
____________________________________________________________________________________________________
High-Speed, Low-Power Voltage Comparators
Pin Descriptions
MAX900
MAX901
PIN
PIN
NAME
FUNCTION
Negative Input
NAME
FUNCTION
Negative Input
(Channels A, B, C, D)
1, 10, 11, 20
IN- (A, B, C, D)
1, 8, 9, 16
IN- (A, B, C, D)
(Channels A, B, C, D)
Positive Input
(Channels A, B, C, D)
Positive Input
(Channels A, B, C, D)
2, 9, 12, 19
3
IN+ (A, B, C, D)
GND
2, 7, 10, 15
3
IN+ (A, B, C, D)
GND
Ground Terminal
Ground Terminal
LATCH (A, B, C,
D)
Latch Input (Channels
A, B, C, D)
Output (Channels A,
B, C, D)
4, 7, 14, 17
4, 5, 12, 13
OUT (A, B, C, D)
Output (Channels A, B,
C, D)
Negative Analog
Supply and Substrate
5, 6, 15, 16
8
OUT (A, B, C, D)
6
V
EE
DD
CC
Negative Analog
Supply and Substrate
11
14
V
V
Positive Digital Supply
V
V
EE
Positive Analog
Supply
13
18
Positive Digital Supply
Positive Analog Supply
DD
CC
V
MAX903
MAX902
PIN
NAME
FUNCTION
PIN
1
NAME
FUNCTION
Positive Analog Supply
Positive Input
Negative Input
(Channels A, B)
V
CC
1, 8
IN- (A, B)
2
IN+
IN-
Positive Input
(Channels A, B)
2, 9
3
IN+ (A, B)
GND
3
Negative Input
Negative Analog
Supply and Substrate
Ground Terminal
4
V
EE
Latch Input (Channels
A, B)
4, 11
5, 12
6, 13
LATCH (A, B)
OUT (A, B)
N.C.
5
6
7
8
LATCH
GND
Latch Input
Output (Channels A, B)
Ground Terminal
Output
No Connection. Not
internally connected.
OUT
V
Positive Digital Supply
DD
Negative Analog
Supply and Substrate
7
V
EE
10
14
V
V
Positive Digital Supply
Positive Analog Supply
DD
CC
_______________________________________________________________________________________
7
High-Speed, Low-Power Voltage Comparators
pushes the output through the transition region cleanly,
Applications Information
but applies a hysteresis in threshold seen at the input
Circuit Layout
Because of the large gain-bandwidth transfer function of
the MAX900–MAX903, special precautions must be
taken to realize their full high-speed capability. A printed
circuit board with a good, low-inductance ground plane
is mandatory. All decoupling capacitors (the small
100nF ceramic type is a good choice) should be mount-
ed as close as possible to the power-supply pins.
terminals.
TTL Output and Latch Inputs
The comparator TTL-output stages are optimized for dri-
ving low-power Schottky TTL with a fan-out of four.
When the latch is connected to a logic high level or left
floating, the comparator is transparent and immediately
responds to changes at the input terminals. When the
latch is connected to a TTL low level, the comparator
output latches in the same state as at the instant that the
latch command is applied, and will not respond to sub-
sequent changes at the input. No latch is provided on
the MAX901.
Separate decoupling capacitors for analog V
and for
CC
digital V
are also recommended. Close attention
DD
should be paid to the bandwidth of the decoupling and
terminating components. Short lead lengths on the
inputs and outputs are essential to avoid unwanted par-
asitic feedback around the comparators. Solder the
device directly to the printed circuit board instead of
using a socket.
Power Supplies
The MAX900–MAX903 can be powered from separate
analog and digital supplies or from a single +5V supply.
The analog supply can range from +5V to +10V with
Input Slew-Rate Requirements
As with all high-speed comparators, the high gain-band-
width product of the MAX900–MAX903 can create oscil-
lation problems when the input traverses the linear
region. For clean output switching without oscillation or
steps in the output waveform, the input must meet mini-
mum slew-rate requirements. Oscillation is largely a
function of board layout and of coupled source imped-
ance and stray input capacitance. Both poor layout and
large-source impedance will cause the part to oscillate
and increase the minimum slew-rate requirement. In
some applications, it may be helpful to apply some posi-
tive feedback between the output and + input. This
V
grounded for single-supply operation (Figures 1A
EE
and 1B) or from a split 5V supply (Figure 1C). The V
digital supply always requires +5V.
DD
In high-speed, mixed-signal applications where a com-
mon ground is shared, a noisy digital environment can
adversely affect the analog input signal. When set up
with separate supplies (Figure 1C), the
MAX900–MAX903 isolate analog and digital signals by
providing a separate AGND (V ) and DGND.
EE
Typical Power-Supply Alternatives
+5V
CC
+10V
+5V
+5V
+5V
V
CC
V
V
CC
V
DD
V
V
DD
DD
OUT
OUT
OUT
GND
GND
GND
V
EE
V
EE
V
EE
-5V
Figure 1A. Separate Analog Supply,
Common Ground
Figure 1B. Single +5V Supply, Common
Ground
Figure 1C. Split 5V Supply, Separate
Ground
8
_______________________________________________________________________________________
High-Speed, Low-Power Voltage Comparators
Definitions of Terms
V
V
V
Input Offset Voltage: Voltage applied
between the two input terminals to obtain
TTL-logic threshold (+1.4V) at the
output.
t
t
Latch Disable-to-Output High Delay:
The propagation delay measured from
the latch-signal crossing the TTL
threshold in a low-to-high transition to
the point of the output crossing TTL
threshold in a low-to-high transition.
OS
IN
pd+ (D)
pd- (D)
Input Voltage Pulse Amplitude: Usually
set to 100mV for comparator
specifications.
Latch Disable-to-Output Low Delay:
The propagation delay measured from
the latch-signal crossing the TTL
threshold in a low-to-high transition to
the point of the output crossing TTL
threshold in a high-to-low transition.
Input Voltage Overdrive: Usually set to
5mV and in opposite polarity to V for
IN
comparator specifications.
t
t
t
Minimum Setup Time: The minimum
time before the negative transition of the
latch signal that an input signal change
must be present in order to be acquired
and held at the outputs.
OD
pd+
pd-
s
h
t
t
Input-to-Output High Delay: The
propagation delay measured from the
time the input signal crosses the input
offset voltage to the TTL-logic threshold
of an output low-to-high transition
Minimum Hold Time: The minimum time
after the negative transition of the latch
signal that an input signal must remain
unchanged in order to be acquired and
held at the output.
Input-to-Output Low Delay: The
propagation delay measured from the
time the input signal crosses the input
offset voltage to the TTL-logic threshold
of an output high-to-low transition.
(D)
Minimum Latch-Disable Pulse Width:
The minimum time that the latch signal
must remain high in order to acquire and
hold an input-signal change.
pw
_______________________________________________________________________________________
9
High-Speed, Low-Power Voltage Comparators
COMPARE
COMPARE
LATCH
ENABLE
INPUT
1.4V
+5V
LATCH
LATCH
LATCH
tpw(D)
t
t
h
s
0
OUTPUT
DIFFERENTAL
INPUT VOLTAGE
V
OS
+5mV
V
IN
V
DD
V
OS
INPUT
100mV
5ns/div
t
(D)
t
pd+
pd-
Figure 3. t
Response Time to 5mV Overdrive
pd+
1.4V
COMPARATOR
OUTPUT
Figure 2. MAX900/MAX902/MAX903 Timing Diagram
V
+5V
CC
+5V
V
+5V
DD
INPUT TO 10X
OUTPUT
SCOPE PROBE
100nF
(10MΩ, 14pF)
10Ω
10Ω
R
L
1kΩ
2.43kΩ
PRECISION
STEP GENERATOR
0
100mV
D.U.T.
10kΩ
OUTPUT TO 10X
SCOPE PROBE
(10MΩ, 14pF)
INPUT
V
DC
OFFSET
ADJUST
100nF
100nF
100nF
V
OS
+5mV
V
-5V
EE
5ns/div
Figure 5. Response-Time Setup
Figure 4. t
Response Time to 5mV Overdrive
pd-
10 ______________________________________________________________________________________
High-Speed, Low-Power Voltage Comparators
OUTPUT
1V/div
OUTPUT
1V/div
INPUT
10mV/div
INPUT
10mV/div
5ns/div
5ns/div
Figure 6. Response to 50MHz Sine Wave
Figure 7. Response to 100MHz Sine Wave Photo
+1.25V
VREF
Typical Application
IN1
UNDER
LIMIT
MX7228
Programmed, Variable-Alarm Limits
By combining two quad analog comparators with an
octal 8-bit D/A converter (the MX7228), several alarm
and limit-defect functions can be performed simultane-
ously without external adjustments
V
OUT1
VDAC1
OCTAL
8-BIT
DAC
OVER
LIMIT
IN2
IN3
The MX7228’s internal latches allow the system
processor to set the limit points for each comparator
independently and update them at any time. Set the
upper and lower thresholds for a single transducer by
pairing the D/A converter and comparator sections.
UNDER
LIMIT
IN4
UNDER
LIMIT
MAX901
MSB
D7
8 x 8
DATA
LATCH
8-BIT
DATA
INPUT
IN5
IN6
UNDER
LIMIT
LSB
D1
UNDER
LIMIT
OVER
LIMIT
IN7
A0
A1
A2
V
OUT8
IN8
CONTROL
LOGIC
VDAC8
OVER
LIMIT
MAX901
Figure 8. Alarm Circuit Level Monitors Eight Separate Inputs
______________________________________________________________________________________ 11
High-Speed, Low-Power Voltage Comparators
Ordering Information (continued)
Pin Configurations (continued)
PART
TEMP RANGE
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
-40°C to +85°C
0°C to +70°C
0°C to +70°C
-40°C to +85°C
-40°C to +85°C
0°C to +70°C
0°C to +70°C
-40°C to +85°C
-40°C to +85°C
PIN-PACKAGE
16 Narrow SO
16 Narrow SO
16 Plastic DIP
16 Plastic DIP
16 Narrow SO
16 Narrow SO
14 Plastic DIP
14 Narrow SO
14 Plastic DIP
14 Narrow SO
8 Plastic DIP
8 SO
TOP VIEW
MAX901ACSE
MAX901BCSE
MAX901AEPE
MAX901BEPE
MAX901AESE
MAX901BESE
MAX902CPD
MAX902CSD
MAX902EPD
MAX902ESD
MAX903CPA
MAX903CSA
MAX903EPA
MAX903ESA
IN- (A)
IN+ (A)
1
2
3
4
5
6
7
8
9
20 IN- (D)
19 IN+ (D)
GND
18 V **
CC
A
B
D
C
LATCH (A)
OUT (A)
OUT (B)
LATCH (B)
17 LATCH (D)
16 OUT (D)
15 OUT (C)
MAX900
14
13
LATCH (C)
V ***
DD
V
*
EE
IN+ (B)
12 IN+ (C)
11 IN- (C)
IN- (B) 10
DIP/SO
*ANALOG V- AND SUBSTRATE
**ANALOG V+
***DIGITAL V+
8 Plastic DIP
8 SO
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
© 2001 Maxim Integrated Products
Printed USA
is a registered trademark of Maxim Integrated Products.
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