参数资料
| 型号： | HA9P4905-5 |
| 厂商： | Intersil |
| 文件页数： | 5/10页 |
| 文件大小： | 0K |
| 描述： | IC COMPARATOR QUAD PREC 16-SOIC |
| 标准包装： | 48 |
| 类型： | 通用 |
| 元件数： | 4 |
| 输出类型： | CMOS，推挽式 |
| 电压 - 电源，单路/双路(±)： | 5 V ~ 15 V，±2.5 V ~ 7.5 V |
| 电压 - 输入偏移（最小值）： | 7.5mV @ ±15V |
| 电流 - 输入偏压（最小值）： | 0.15µA @ ±15V |
| 电流 - 输出（标准）： | 50mA |
| 电流 - 静态（最大值）： | 20mA |
| 工作温度： | 0°C ~ 75°C |
| 封装/外壳： | 16-SOIC（0.295"，7.50mm 宽） |
| 安装类型： | 表面贴装 |
| 包装： | 管件 |
4
Applying the HA-4900 Series Comparators
Supply Connections
This device is exceptionally versatile in working with most available
power supplies. The voltage applied to the V+ and V- terminals
determines the allowable input signal range; while the voltage applied
to the VL+ and VL- determines the output swing. In systems where
dual analog supplies are available, these would be connected to V+
and V-, while the logic supply and return would be connected to
VLOGIC+ and VLOGIC-. The analog and logic supply commons can
be connected together at one point in the system, since the comparator
is immune to noise on the logic supply ground. A negative output
swing may be obtained by connecting VL+ to ground and VL- to a
negative supply. Bipolar output swings (15VP-P, Max) may be
obtained using dual supplies. In systems where only a single logic
supply is available (+5V to 15V), V+ and VLOGIC+ may be
connected together to the positive supply while V- and VLOGIC- are
grounded. If an input signal could swing negative with respect the V-
terminal, a resistor should be connected in series with the input to limit
input current to < 5mA since the C-B junction of the input transistor
would be forward biased.
Unused Inputs
Inputs of unused comparator sections should be tied to a differential
voltage source to prevent output “chatter.”
Crosstalk
Simultaneous high frequency operation of all other channels in the
package will not affect the output logic state of a given channel,
provided that its differential input voltage is sufficient to define a
given logic state (
ΔV
IN ≥ ±VOS). Low level or high impedance
input lines should be shielded from other signal sources to reduce
crosstalk and interference.
Power Supply Decoupling
Decouple all power supply lines with 0.01
μF ceramic capacitors to
ground line located near the package to reduce coupling between
channels or from external sources.
Response Time
Fast rise time (<200ns) input pulses of several volts amplitude may
result in delay times somewhat longer than those illustrated for
100mV steps. Operating speed is optimized by limiting the
maximum differential input voltage applied, with resistor-diode
clamping networks.
Typical Applications
Data Acquisition System
In this circuit the HA-4900 series is used in conjunction with a D
to A converter to form a simple, versatile, multi-channel analog
input for a data acquisition system. In operation the processor first
sends an address to the D to A, then the processor reads the digital
word generated by the comparator outputs. To perform a simple
comparison, the processor sets the D to A to a given reference
level, then examines one or more comparator outputs to determine
if their inputs are above or below the reference. A window
comparison consists of two such cycles with 2 reference levels set
by the D to A. One way to digitize the inputs would be for the
processor to increment the D to A in steps. The D to A address, as
each comparator switches, is the digitized level of the input. While
stairstepping the D to A is slower than successive approximation,
all channels are digitized during one staircase ramp.
Schematic Diagram
Q9D
BIAS 2
ONE FOURTH ONLY
R20D
1k
Ω
R20C
1k
Ω
R20B
1k
Ω
R20A
1k
Ω
Q9C
Q9B
Q9A
R21
1k
Ω
Q10
D9A
BIAS 1
Q5
Q4
D4A
D4B
Q4C
Q3
R16
540
Ω
PR1
200k
Ω
R10
4k
Ω
Q2
Q1
R9
4k
Ω
BIAS 3
BIAS 4
Q11
+IN
Q17
Q18
Q12
Q13
R1
500
Ω
R2
13k
Ω
R3
1k
Ω
Q19
Q20
Q14
R4
1k
Ω
Q21
Q22
-IN
MN1
R7
2.5k
Ω
R6
2.5k
Ω
Q16
Q7
Q23
R5
360
Ω
MN2
MN3
Q24 Q25
R18
664
Ω
Q38
MN4
D45
D11A
Q26
R17
19k
Ω
R14
5k
Ω
Q33
Q34
Q36
Q37
Q30
Q28
R11
8k
Ω
R15
8k
Ω
Q31
R23
100
Ω
R24
14k
Ω
D29B
Q29
Q29A
R22
100
Ω
R12
8k
Ω
Q32
MN6
MN5
VLOGIC-
OUT
VLOGIC+
V-
V+
Q15
D35
D39
HA-4900, HA-4902, HA-4905
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